US20100028339A1

US20100028339A1 - Compositions including triciribine and trastuzumab and methods of use thereof

Info

Publication number: US20100028339A1
Application number: US12/118,834
Authority: US
Inventors: Jin Q. Cheng; Said M. Sebti
Original assignee: Individual
Current assignee: University of South Florida
Priority date: 2004-03-29
Filing date: 2008-05-12
Publication date: 2010-02-04
Also published as: US20130084279A1; US9486522B2; US20140302011A1; US20160136273A1; US9186403B2; US8623834B2

Abstract

This application relates to combination therapies including triciribine and related compounds and trastuzumab or a salt thereof and compositions with reduced toxicity for the treatment and prevention of tumors, cancer, and other disorders associated with abnormal cell proliferation.

Description

This application is a continuation-in-part of U.S. application Ser. No. 11/096,082, filed Mar. 25, 2005, which claims the benefit of U.S. provisional patent application No. 60/557,599 filed Mar. 29, 2004, which is incorporated herein by reference.

ACKNOWLEDGEMENT OF GOVERNMENT SUPPORT

This invention was made, in part, with government support under grant (contract) nos. P30-CA 16672; 1RO1-CA109570; 1RO1-CA119127; PO1-CA099031 project 4; and P50 CA116100 01 project 4 awarded by the National Institutes of Health and grant no. DAMD17-02-1-0694 awarded by the Department of Defense. The government has certain rights to this invention.

1. FIELD OF THE INVENTION

This application relates to combination therapies including triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, and compositions with reduced toxicity for the treatment and prevention of tumors, cancer, and other disorders associated with abnormal cell proliferation.

2. BACKGROUND OF THE INVENTION

Cancer is an abnormal growth of cells. Cancer cells rapidly reproduce despite restriction of space, nutrients shared by other cells, or signals sent from the body to stop reproduction. Cancer cells are often shaped differently from healthy cells, do not function properly, and can spread into many areas of the body. Abnormal growths of tissue, called tumors, are clusters of cells that are capable of growing and dividing uncontrollably. Tumors can be benign (noncancerous) or malignant (cancerous). Benign tumors tend to grow slowly and do not spread. Malignant tumors can grow-rapidly, invade and destroy nearby normal tissues, and spread throughout the body.
Cancers are classified according to the kind of fluid or tissue from which they originate, or according to the location in the body where they first developed. In addition, some cancers are of mixed types. Cancers can be grouped into five broad categories, carcinomas, sarcomas, lymphomas, leukemias, and myelomas, which indicate the tissue and blood classifications of the cancer. Carcinomas are cancers found in body tissue known as epithelial tissue that covers or lines surfaces of organs, glands, or body structures. For example, a cancer of the lining of the stomach is called a carcinoma. Many carcinomas affect organs or glands that are involved with secretion, such as breasts that produce milk. Carcinomas account for approximately eighty to ninety percent of all cancer cases. Sarcomas are malignant tumors growing from connective tissues, such as cartilage, fat, muscle, tendons, and bones. The most common sarcoma, a tumor on the bone, usually occurs in young adults. Examples of sarcoma include osteosarcoma (bone) and chondrosarcoma (cartilage). Lymphoma refers to a cancer that originates in the nodes or glands of the lymphatic system, whose job it is to produce white blood cells and clean body fluids, or in organs such as the brain and breast. Lymphomas are classified into two categories: Hodgkin's lymphoma and non-Hodgkin's lymphoma. Leukemia, also known as blood cancer, is a cancer of the bone marrow that keeps the marrow from producing normal red and white blood cells and platelets. White blood cells are needed to resist infection. Red blood cells are needed to prevent anemia. Platelets keep the body from easily bruising and bleeding. Examples of leukemia include acute myelogenous leukemia, chronic myelogenous leukemia, acute lymphocytic leukemia, and chronic lymphocytic leukemia. The terms myelogenous and lymphocytic indicate the type of cells that are involved. Finally, myelomas grow in the plasma cells of bone marrow. In some cases, the myeloma cells collect in one bone and form a single tumor, called a plasmacytoma. However, in other cases, the myeloma cells collect in many bones, forming many bone tumors. This is called multiple myeloma.
Tumor induction and progression are often the result of accumulated changes in the tumor-cell genome. Such changes can include inactivation of cell growth inhibiting genes, or tumor suppressor genes, as well as activation of cell growth promoting genes, or oncogenes. Hundreds of activated cellular oncogenes have been identified to date in animal models, however, only a small minority of these genes have proven to be relevant to human cancers (Weinberg et al., Oncogenes and the Molecular Origins of Cancer, 1989. Cold Spring Harbor, N.Y.; Stanbridge J. et al., Cell, 1990. 63: p 867-874; Godwin et al., in Gynecological oncology: principles and practice, Hoskins W. J., Perez C. A. and Young R. C. (eds.), 1992. pp 87-116, Lippincott, Philadelphia). The activation of oncogenes in human cancers can result from factors such as increased gene copy number or structural changes. These factors can cause numerous cellular effects, for example, they can result in overexpression of a gene product. Several oncogenes involved in human cancer can be activated through gene overexpression.
It has become apparent that the successive genetic aberrations acquired by cancer cells result in defects in regulatory signal transduction circuits that govern normal cell proliferation, differentiation and programmed cell death (Hanahan, D. and Weinberg R. A., Cell, 2000. 100(1): p. 57-700). This in turn results in fundamental defects in cell physiology which dictate malignancy. These defects include: a) self sufficiency in growth signals (i.e. overexpression of growth factor receptor tyrosine kinases such as EGFR and aberrant activation of downstream signal transduction pathways such as Ras/Raf/Mek/Erk 1/2 and Ras/PI3K/Akt), b) resistance to anti-growth signals (i.e. lower expression of TGFβ and its receptor), c) evading apoptosis (i.e. loss of proapoptotic p53; overexpression of pro-survival Bcl-2; hyperactivation of survival pathways such as those mediated by PI3K/Akt), d) sustained angiogenesis (i.e. high levels of secretion of VEGF) and f) tissue invasion and metastasis (i.e. extracellular proteases and prometastatic integrins) (Hanahan, D. and Weinberg R. A., Cell, 2000. 100(1): p. 57-700).
Receptor tyrosine kinases such as EGFR, ErbB2, VEGFR and insulin-like growth factor 1 receptor (IGF-1R) are intimately involved in the development of many human cancers including colorectal pancreatic, breast and ovarian cancers (Khaleghpour K. et al., Carcinogenesis, 2004. 25(2): p. 241-8; Sekharam M. et al., Cancer Res, 2003. 63(22): p. 7708-16). Binding of ligands such as EGF, VEGF and IGF-1 to their receptors promotes stimulation of the intrinsic tyrosine kinase activity, autophosphorylation of specific tyrosines in the cytoplasmic domain of the receptors and recruitment of signaling proteins that trigger a variety of complex signal transduction pathways (Olayioye M. A. et al., Embo J, 2000. 19(13): p. 3159-67; Porter A. C. and Vaillancourt R. R., Oncogene, 1998. 17(11 Reviews): p. 1343-52). This in turn leads to the activation of many tumor survival and oncogenic pathways such as the Ras/Raf/Mek/Erk ½, JAK/STAT3 and PI3K/Akt pathways. Although all three pathways have been implicated in colon, pancreatic, breast and ovarian oncogenesis, those that are mediated by Akt have been shown to be critical in many steps of malignant transformation including cell proliferation, anti-apoptosis/survival, invasion and metastasis and angiogenesis (Datta S. R. et al., Genes Dev, 1999, 13(22): p, 2905-27).
Akt is a serine/threonine protein kinase (also known as PKB), which has 3 family members Akt1, Akt2 and Akt3. Stimulation of cells with growth or survival factors results in recruitment to the receptors of the lipid kinase phosphoinositide-3-OH-kinase (PI3K) which phosphorylates phosphoinositol-4,5-biphosphate (PIP2) to PIP₃which recruits Akt to the plasma membrane where it can be activated by phosphorylation on Thr308 and Ser473 (Akt1), Thr308 and Ser474 (Akt2) and Thr308 and Ser472 (Akt3) (Datta S. R. et al., Genes Dev, 1999. 13(22): p. 2905-27). Thus, PI3K activates Akt by phosphorylating PIP2 and converting to PIP3. The phosphatase PTEN dephosphorylates PIP3 to PIP2 and hence prevents the activation of Akt.
The majority of human cancers contain hyperactivated Akt (Datta S. R. et al., Genes Dev, 1999. 13(22): p. 2905-27; Bellacosa A. et al., Int J Cancer, 1995. 64(4): p. 280-5; Sun M. et al., Am J Pathol, 2001. 159(2): p. 431-7). In particular, Akt is overexpressed and/or hyperactivated in 57%, 32%, 27% and 36% of human colorectal, pancreatic, breast and ovarian cancers, respectively (Roy H. K. et al. Carcinogenesis, 2002. 23(1): p. 201-5; Altomare D. A. et al., J Cell Biochem, 2003. 88(1): p. 470-6; Sun M. et al., Cancer Res, 2001. 61(16): p. 5985-91; Stal O. et al., Breast Cancer Res, 2003. 5(2): p. R37-44; Cheng J. Q. et al., Proc Natl Acad Sci USA, 1992. 89(19): p. 9267-71; Yuan Z. Q. et al., Oncogene, 2000. 19(19): p. 2324-30). Hyperactivation of Akt is due to amplification and/or overexpression of Akt itself as well as genetic alterations upstream of Akt including overexpression of receptor tyrosine kinases and/or their ligands and deletion of the phosphatase PTEN (Khaleghpour K. et al., Carcinogenesis, 2004. 25(2): p. 241-8; Sekharam M. et al., Cancer Res, 2003. 63(22): p. 7708-16; Cohen B. D. et al., Biochem Soc Symp, 1998. 63: p. 199-210; Muller W. J. et al., Biochem Soc Symp, 1998. 63: p. 149-57; Miller W. E. et al., J Virol, 1995. 69(7): p. 4390-8; Slamon D. J. et al., Science, 1987. 235(4785): p. 177-82; Andrulis I. L. et al., J Clin Oncol, 1998. 16(4): p. 1340-9). Proof-of-concept of the involvement of Akt in oncogenesis has been demonstrated preclinically by showing that ectopic expression of Akt induces malignant transformation and promotes cell survival (Sun M. et al., Am J Pathol, 2001. 159(2): p. 431-7; Cheng J. Q. et al., Oncogene, 1997. 14(23): p. 2793-801) and that disruption of Akt pathways inhibits cell growth and induces apoptosis (Jetzt A. et al. Cancer Res, 2003. 63(20): p. 6697-706).
Current treatments of cancer and related diseases have limited effectiveness and numerous serious unintended side effects. Despite demonstrated clinical efficacy of many anti-cancer drugs, severe systemic toxicity often halts the clinical development of promising chemotherapeutic agents. Further, overexpression of receptor tyrosine kinases such as EGFR and their ligands such as IGF-1, Akt overexpression and/or loss of PTEN (all of which result in hyperactivation of Akt) are associated with poor prognosis, resistance to chemotherapy and shortened survival time of cancer patients. Current research strategies emphasize the search for effective therapeutic modes with less risk.
Thus, a combination of a triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab, holds promise as a potential combination therapy for treating tumors, cancer, and abnormal cell proliferation while synergistically reducing toxicity or adverse side effects caused by currently administered cancer compounds.

3. SUMMARY OF THE INVENTION

The present invention provides novel therapeutic regimens of triciribine, triciribine phosphate and related compounds in combination with a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, to treat tumors or cancer in a subject while limiting systemic toxicity. The invention is based on the discovery that tumors or cancers, which overexpress Akt kinase are particularly sensitive to the cytotoxic effects of TCN and related compounds and a synergistic affect would arise with a combination of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof. The inventors have determined, contrary to the prior art and experience, how to successfully use triciribine and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, to treat tumors and cancer by one or a combination of (i) administering triciribine and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, to patients who exhibit enhanced sensitivity to the triciribine compound and or the trastuzumab or a salt thereof; (ii) use of a described dosage level that minimizes the toxicity of the triciribine compound and/or the a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, but yet still exhibits efficacy; or (iii) use of a described dosage regimen that minimizes the toxicity of the triciribine compound and/or the a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof.
In one aspect of the present invention, the invention encompasses a composition including.
(i) a compound of the formula I:
wherein each R2′, R3′ and R5′ are independently hydrogen, optionally substituted phosphate or phosphonate (including mono-, di-, or triphosphate or a stabilized phosphate prodrug); acyl (including lower acyl); alkyl (including lower alkyl); amide, sulfonate ester including alkyl or arylalkyl; sulfonyl, including methanesulfonyl and benzyl, wherein the phenyl group is optionally substituted with one or more substituents as for example as described in the definition of an aryl given herein; optionally substituted arylsulfonyl; a lipid, including a phospholipid; an amino acid; a carbohydrate; a peptide; or cholesterol; or other pharmaceutically acceptable leaving group that, in vivo, provides a compound wherein R2′, R3′ or R5′ is independently H or mono-, di- or tri-phosphate;
wherein R^xand R^yare independently hydrogen, optionally substituted phosphate; acyl (including lower acyl); amide, alkyl (including lower alkyl); aromatic, polyoxyalkylene such as polyethyleneglycol, optionally substituted arylsulfonyl; a lipid, including a phospholipid; an amino acid; a carbohydrate; a peptide; or cholesterol; or other pharmaceutically acceptable leaving group. In one embodiment, the compound is administered as a 5′-phosphoether lipid or a 5′-ether lipid.
R₁and R₂each are independently H, optionally substituted straight chained, branched or cyclic alkyl (including lower alkyl), alkenyl, or alkynyl, CO-alkyl, CO-alkenyl, CO-alkynyl, CO-aryl or heteroaryl, CO-alkoxyalkyl, CO-aryloxyalkyl, CO-substituted aryl, sulfonyl, alkylsulfonyl, arylsulfonyl, aralkylsulfonyl;
(ii) a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof; and
(iii) a pharmaceutically acceptable carrier.
In another embodiment, the invention encompasses a method of treating a tumor or cancer in a mammal including administering to the mammal an effective amount of a composition including:
(i) a compound of formula I:
wherein each R2′, R3′ and R5′ are independently hydrogen, optionally substituted phosphate or phosphonate (including mono-, di-, or triphosphate or a stabilized phosphate prodrug); acyl (including lower acyl); alkyl (including lower alkyl); amide, sulfonate ester including alkyl or arylalkyl; sulfonyl, including methanesulfonyl and benzyl, wherein the phenyl group is optionally substituted with one or more substituents as for example as described in the definition of an aryl given herein; optionally substituted arylsulfonyl; a lipid, including a phospholipid; an amino acid; a carbohydrate; a peptide; or cholesterol; or other pharmaceutically acceptable leaving group that, in vivo, provides a compound wherein R2′, R3′ or R5′ is independently H or mono-, di- or tri-phosphate;
wherein R^xand R^yare independently hydrogen, optionally substituted phosphate; acyl (including lower acyl); amide, alkyl (including lower alkyl); aromatic, polyoxyalkylene such as polyethyleneglycol, optionally substituted arylsulfonyl; a lipid, including a phospholipid; an amino acid; a carbohydrate; a peptide; or cholesterol; or other pharmaceutically acceptable leaving group. In one embodiment, the compound is administered as a 5′-phosphoether lipid or a 5′-ether lipid.
R₁and R₂each are independently H, optionally substituted straight chained, branched or cyclic alkyl (including lower alkyl), alkenyl, or alkynyl, CO-alkyl, CO-alkenyl, CO-alkynyl, CO-aryl or heteroaryl, CO-alkoxyalkyl, CO-aryloxyalkyl, CO-substituted aryl, sulfonyl, alkylsulfonyl, arylsulfonyl, aralkylsulfonyl; and
(ii) a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof.
Methods are useful to treat tumors and cancers that are particularly susceptible to the toxic effects of TCN, TCN-P and/or related compounds. In another embodiment, methods are provided for treating a tumor in a mammal, particularly a human that includes (i) obtaining a biological sample from the tumor; (ii) determining whether the tumor overexpresses an Akt kinase, and (iii) treating the tumor that overexpresses Akt kinase with triciribine, triciribine phosphate or a related compound in combination with trastuzumab or a salt thereof, as described herein. In another embodiment, the level of Akt kinase expression can be determined by assaying the tumor or cancer for the presence of a phosphorylated Akt kinase, for example, by using an antibody that can detect the phosphorylated form. In another embodiment, the level of Akt expression can be determined by assaying a tumor or cancer cells obtained from a subject and comparing the levels to a control tissue. In certain embodiments, the Akt can be overexpressed at least 2, 2.5, 3 or 5 fold in the cancer sample compared to the control. In certain embodiments, the overexpressed Akt kinase can be a hyperactivated and phosphorylated Akt kinase.
In some aspects of the present invention triciribine, triciribine phosphate or a related compound increases and/or restores sensitivity to a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof. In some embodiments, triciribine, triciribine phosphate or a related compound compensates for PTEN deficiency. In some embodiments of the present invention, triciribine, triciribine phosphate or a related compound in combination with a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, works synergistically. In other embodiments, triciribine, triciribine phosphate or a related compound in combination with a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, induces apoptosis. In other embodiments, triciribine, triciribine phosphate or a related compound in combination with a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, decreases activity of PI3K.
In another aspect of the present invention, dosing regimens are provided that limit the toxic side effects of TCN and related compounds. In another embodiment, such dosing regimens minimize or eliminate toxic side effects, including, but not limited to, hepatoxicity, thrombocytopenia, hyperglycemia, vomiting, hypocalcemia, anemia, hypoalbunemia, myelosuppression, hypertriglyceridemia, hyperamylasemia, diarrhea, stomachitis and or fever. In another embodiment, the administration of TCN, TCN-P or related compounds provides at least a partial, such as at least 15, 20 or 30%, or complete response in vivo in at least 15, 20, or 25% of the subjects.
In another embodiment, a method is provided to treat a subject who has been diagnosed with a tumor by administering to the subject an effective amount of TCN, TCN-P or a related compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, according to a dosing schedule that includes administering the triciribine compound and the a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, approximately one time per week for approximately three weeks followed by a one week period wherein the triciribine compound and the molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, is not administered. In another embodiment, methods are provided to treat tumor or cancer in a subject by administering to the subject a dosing regimen of 10 mg/m²or less of TCN, TCN-P or a related compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, each one time per week. In another embodiment, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered as a single bolus dose over a short period of time, for example, about 5, 10 or 15 minutes. In further embodiments, dosing schedules are provided in which the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, are administered via continuous infusion for at least 24, 48, 72, 96, or 120 hours. In certain embodiments, the continuous administration can be repeated at least once a week, once every two weeks and/or once a month. In other embodiments, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered at least once every three weeks. In further embodiments, the compounds can be administered at least once a day for al least 2, 3, 4 or 5 days.
In further embodiments, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, as disclosed herein can be administered to patients in an amount that is effective in causing tumor regression. The administration the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can provide at least a partial, such as at least 15, 20 or 30%, or complete response in vivo in at least 15-20% of the subjects. In certain embodiments, at least 2, 5, 10, 15, 20, 30 or 50 mg/hr of the triciribine compound and at least about 20, 50, 100, 150, 200, 300, 400, 600, 800, or 1000 mg a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof or a salt thereof, disclosed herein can be administered to a subject. The administration of the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be conducted according to any of the therapeutic regimens disclosed herein. In particular embodiments, the dosing regimen can include administering less than 20 mg/m²of the triciribine compound and less than 400 mg of trastuzumab or a salt thereof. In one embodiment, less than 10 mg/m²of the triciribine compound and less than 400 mg trastuzumab or a salt thereof or a salt thereof can be administered once a week. In further embodiments, dosages of or less than 2 mg/m², 5 mg/m², 10 mg/m², and/or 15 mg/m²of the triciribine compound and less than 400 mg, 300 mg, 200 mg, 100 mg, and/or 50 mg of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered to a subject. In another embodiment, less than 10 mg/m²can be administered to a subject via continuous infusion for at least five days. In particular embodiments, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be used for the treatment of pancreatic, prostate, colo-rectal and/or ovarian cancer.
In another embodiment, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, and/or can be used in a therapeutic regimen to prevent and/or treat a carcinoma, sarcoma, lymphoma, leukemia, and/or myeloma. In other embodiments of the invention, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be used to treat solid tumors. In still further embodiments, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, and compositions disclosed herein can be used for the treatment of a tumor or cancer, such as, but not limited to cancer of the following organs or tissues: breast, prostate, bone, lung, colon, including, but not limited to colorectal, urinary, bladder, non-Hodgkin lymphoma, melanoma, kidney, renal, pancreas, pharynx, thyroid, stomach, brain, and/or ovaries. In a particular embodiment, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be used for the treatment of pancreatic, breast, colorectal and or ovarian cancer. In further embodiments of the present invention, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, disclosed herein can be used in the treatment of angiogenesis-related diseases. In certain embodiments, methods are provided to treat leukemia via continuous infusion of the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, via continuous infusion for at least 24, 48, 72 or 96 hours. In other embodiments, the continuous infusion can be repeated, for example, at least once every two, three or four weeks.
In a particular embodiment, there is provided a method for the treatment of tumors, cancer, and others disorders associated with an abnormal cell proliferation in a host, the method includes administering to the host an effect amount of the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, optionally in combination with a pharmaceutically acceptable carrier.
In one aspect, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, and compositions can be administered in combination and can form part of the same composition, or be provided as a separate composition for administration at the same time or a different time.
In other embodiments, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, as disclosed herein can be used to treat tumors or cancers resistant to one or more known anti-cancer drugs, including the embodiments of tumors or cancers and compounds disclosed herein. In one embodiment, the triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, as disclosed herein is administered in an effective amount for the treatment of a patient with a drug resistant tumor or cancer, for example, multidrug resistant tumors or cancer including, but not limited to, those resistant to taxol alone, rapamycin, tamoxifen, cisplatin, and/or gefitinib (iressa).
In certain embodiments, a method is provided including administering to a host in need thereof an effective amount of a triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, disclosed herein, or pharmaceutical composition including a triciribine compound and trastuzumab or a salt thereof, in an effective amount for the treatment of the treatment of tumors, cancer, and others disorders associated with an abnormal cell proliferation in a host.
In another embodiment, a method for the treatment of a tumor or cancer is provided including an effective amount of a triciribine compound disclosed herein, or a salt, isomer, prodrug or ester thereof and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, to an individual in need thereof, wherein the cancer is for example, carcinoma, sarcoma, lymphoma, leukemia, or myeloma. The compound, or salt, isomer, prodrug or ester thereof, is optionally provided in a pharmaceutically acceptable composition including the appropriate carriers, such as water, which is formulated for the desired route of administration to an individual in need thereof. Optionally the compound is administered in combination or alternation with at least one additional therapeutic agent for the treatment of tumors or cancer.
Also within the scope of the invention is the use of a compound disclosed herein or a salt, prodrug or ester thereof in the treatment of a tumor or cancer, optionally in a pharmaceutically acceptable carrier; and the use of a triciribine compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, disclosed herein or a salt, prodrug or ester thereof in the manufacture of a medicament for the treatment of cancer or tumor, optionally in a pharmaceutically acceptable carrier.

4. BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 demonstrates the identification of API-2 (triciribine) as a candidate of Akt inhibitor from the NCI Diversity Set. FIG. 1A illustrates the chemical structure of API-2 (triciribine). FIG. 1B demonstrates that API-2 inhibits phosphorylation levels of AKT2 in AKT2-transformed NIH3T3 cells. Wile type AKT2-transformed NIH3T3 cells were treated with API-2 (1 μM) for indicated times and subjected to immunoblotting analysis with anti-phospho-Akt-T308 and -S473 antibodies (top and middle panels). The bottom panel shows expression of total AKT2. In FIG. 1C, it is shown that API-2 inhibits three isoforms of Akt. HEK293 cells were transfected with HA-Akt1, -AKT2 and -AKT3 and treated with API-2 (1 μM) or wortmannin (15 μM) prior to EOF stimulation, the cells were lysed and immunoprecipitated with anti-HA antibody. The immunoprecipitates were subjected to in vitro kinase assay (top) and immunoblotting analysis with anti-phospho-Akt-T308 (bottom) antibody. Middle panel shows expression of transfected Akt1, AKT2 and AKT3. FIG. 1D illustrates that API-2 did not inhibit Akt in vitro. In vitro kinase assay of constitutively active AKT2 recombinant protein in a kinase buffer containing 1 μM API-2 (lane 3).

FIG. 2 demonstrates that API-2 does not inhibit PI3K, PDK1 and the closely related members of AGC kinase family. FIG. 2A demonstrates an in vitro PI3K kinase assay. HEK293 cells were serum-starved and treated with API-2 (1 μM) or Wortmannin (15 μM) for 30 minutes prior to EGF stimulation. Cells were lysed and immunoprecipitated with anti-p110□ antibody. The immunoprecipitates were subjected to in vitro kinase assay using PI-4-Pas substrate. FIG. 2B illustrates the effect of API-2 on in vitro PDK1 activation (top panel), closed circles show inhibition by API-2. Open circles show inhibition by the positive control staurosporine, which is a potent PDK1 inhibitor (IC50=5 nM). Bottom panels are immunoblotting analysis of HEK293 cells that were transfected with Myc-PDK1 and treated with wortmannin or API-2 prior to EGF stimulation. The immunoblots were detected with indicated antibodies. FIG. 2C illustrates an immunoblot analysis of phosphorylation levels of PKC□ with anti-phospho-PKC□ T638 (top) and total PKC□ (bottom) antibodies following treatment with API-2 or a nonselective PKC inhibitor Ro31-8220. FIG. 2D shows an in vitro SGK kinase assay. HEK293 cells were transfected with HA-SGK and treated with API-2 or wortmannin prior to EGF stimulation. In vitro kinase was performed with HA-SGK immunoprecipitates using MBP as substrate (top). Bottom panel shows the expression of transfected HA-SGK. FIG. 2E illustrates the results of a PKA kinase assay. Immuno-purified PKA was incubated in ADB buffer (Upstate Biotechnology Inc) containing indicated inhibitors (API-2 or PKAI) and substrate Kemptide. The kinase activity was quantified. In FIG. 2F, a western blot is shown. OVCAR3 cells were treated with API-2 for indicated times. Cell lysates were immunoblotted with indicated anti-phospho-antibodies (panels 1-4) and anti-actin antibody (bottom).

FIG. 3 demonstrates that API-2 inhibits Akt activity and cell growth and induces apoptosis in human cancer cells with elevated Akt. FIG. 3A is a western blot, following treatment with API-2, phosphorylation levels of Akt were detected with anti-phospho-Akt-T308 antibody in indicated human cancer cell lines. The blots were reprobed with anti-total Akt antibody (bottom panels). In FIG. 3B, a cell proliferation assay is shown. Cell lines as indicated in the figure were treated with different doses of API-2 for 24 h and 48 h and then analyzed with CellTiter 96 Cell Proliferation Assay kit (Promega). FIG. 3C provides an apoptosis analysis. Cells were treated with API-2 and stained with annexin V and PI and analyzed by FACScan.

FIG. 4 shows that API-2 inhibits downstream targets of Akt and exhibits anti-tumor activity in cancer cell lines with elevated Akt in mouse xenograft. In FIG. 4A, it is demonstrated that API-2 inhibits Akt phosphorylation of tuberin, Bad, AFX and GSK-3□. Following treatment with API-2, OVAR3 cells were lysed and immunoblotted with indicated antibodies. FIG. 4B shows that API-2 inhibits tumor growth. Tumor cells were subcutaneously injected into nude mice with low level of Akt cells on left side and elevated level of Akt cells on right side. When the tumors reached an average size of about 100-150 mm³, animals were treated with either vehicle or 1 mg/kg/day API-2. Each measurement represents an average of 10 tumors. FIG. 4C illustrates a representation of the mice with OVCAR3 (right) and OVCAR5 (left) xenograft treated with API-2 or vehicle (control). FIG. 4D shows examples of tumor size (bottom) and weight (top) at the end of experiment. In FIG. 4E, immunoblot analysis of tumor lysates was performed with anti-phospho-Akt-S473 (top) and anti-AKT2 (bottom) antibodies in OVCAR-3-derived tumors that were treated (T3 and T4) and untreated (T1 and T2) with API-2.

FIG. 5 shows that API-2 (triciribine) inhibits Akt kinase activity in vitro. In vitro kinase assay was performed with recombinant of PDK1 and Akt in a kinase buffer containing phosphatidylinositol-3,4,5-P3 (PIP3), API-2 and histone H2B as substrate. After incubation of 30 min, the reactions were separated by SDS-PAGE and exposed in a film.

FIG. 6 provides the mRNA and amino acid sequence of human Akt1, restriction enzyme sites are also noted.

FIG. 7 provides the mRNA and amino acid sequence of human Akt2 restriction enzyme sites are also noted.

FIG. 8 provides the mRNA and amino acid sequence of human Akt3 restriction enzyme sites are also noted.

FIG. 9 shows growth inhibition by the combination of trastuzumab and Akt/mTOR pathway inhibitors. PTEN anti-sense or non-specific oligonucleotide transfected BT474.ml cells were treated with inhibitors of the Akt/mTOR pathway alone or in combination with trastuzumab and the relative cell growth was assessed. FIG. 9A shows a panel of Akt/mTOR inhibitors. Growth inhibition was assessed in PTEN AS transfected BT474.ml cells. The doses shown are: Triciribine (TCN) 1 μM; RAD001 0.2 nM; QLT0267 10 μM; KP 372-1 0.05 μM; 4ADPIB 5 μM; Edelfosine 7.5 μM; and trastuzumab (Ttzm) 2 μg/ml. The standard deviation (SD) in the percent growth inhibition is indicated. Results shown are the combined data from 2-3 experiments with triplicates of each treatment within each experiment. FIG. 9B shows TCN inhibits cell growth in combination with trastuzumab. BT474.ml cells were transfected with PTEN AS oligonucleotide or non-specific (NS) oligonucleotide, treated with trastuzumab and TCN, alone and in combination, at multiple doses of TCN and assayed for growth inhibition. Trastuzumab was administered at a single concentration. FIG. 7C shows RAD001 inhibits cell growth in combination with trastuzumab. BT474.ml cells were transfected with PTEN AS oligonucleotide or non-specific (NS) oligonucleotide, treated with trastuzumab and RAD001, alone and in combination, at multiple doses of RAD001 and assayed for growth inhibition. For FIGS. 9B and 9C: * indicates a significant difference in growth inhibition following combination treatment as compared to either trastuzumab or TCN/TAD001 alone. P<0.05 was considered significant. Error bars depict the SEM.

FIG. 10 shows the synergistic effects on apoptosis. Twenty-four hours after plating, PTEN AS and NS transfected BT474.ml cells were treated as indicated with trastuzumab (Ttzm), TCN and/or RAD001 at the following concentrations: trastuzumab 2 μg/ml; triciribine 2.5 μM; RAD001 0.4 nM. Apo-BrdU Tunel assays were performed to assess apoptosis. The experiment was performed 3 times and the data shown is the mean apoptosis. Error bars depict the standard deviation, Trastuzumab+triciribine treatment significantly induced apoptosis (p<0.01) as compared with all other treatments.

FIG. 11 shows inhibition of Akt and p70S6K activity. To evaluate the effects of these drugs on the Akt/mTOR pathway, PTEN AS and NS oligonucleotides were transfected int BT474.ml cells. Two days later, the cells were treated for 2 hours with trastuzumab and triciribine (TCN) (FIG. 11A) or trastuzumab and RAD001 (FIG. 11B). Total cell lysates were collected, separated by SDS-PAGE and immunoblotted as indicated. The concentration of trastuzumab was 2 μg/ml, triciribine was 2.5 μM and RAD001 was 0.4 nM. The experiments were repeated at least twice to insure that results were reproducible.

FIG. 12 shoes combination treatments inhibited tumor growth in a SCID mice xenograft model. SCID mice received BT474.ml breast cancer cell xenografts in mammary fat pad. The xenografts grew for 3 weeks to generate tumors with an average size of 100-150 mm³. PTEN antisense oligonucleotides, trastuzumab, triciribine (FIG. 12A) and RAD001 (FIG. 12B) were administered. The tumors were measured twice weekly with calipers and tumor size was averaged for each treatment group. Error bars denote the standard error of the mean. * indicates a significant difference in growth inhibition following combination treatment as compared to either trastuzumab (Ttzm), TCN or DMSO alone. P<0.05 was considered significant.

5. DETAILED DESCRIPTION OF THE INVENTION

The inventors have determined, contrary to the prior art and experience, how to successfully use triciribine compounds in combination with a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, to treat tumors and cancer by one or a combination of (i) administering triciribine and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, only to patients, who according to a diagnostic test described below, exhibit enhanced sensitivity to the triciribine compound and/or the trastuzumab or a salt thereof; (ii) using a described dosage level that minimizes the toxicity of the triciribine compound and/or the trastuzumab or a salt thereof but yet still exhibits efficacy; or (iii) using a described dosage regimen that minimizes the toxicity of the triciribine compound and/or the trastuzumab or a salt thereof.

5.1. Definitions

As used herein, the term “compounds of the invention” refers to compounds of formula I, compounds of formula II, and combinations thereof.
As used herein, the terms “cancer” and “cancerous” refer to or describe the physiological condition in mammals that is typically characterized by unregulated cell growth, i.e., proliferative disorders. Examples of such proliferative disorders include cancers such as carcinoma, lymphoma, blastoma, sarcoma, and leukemia, as well as other cancers disclosed herein. More particular examples of such cancers include breast cancer, prostate cancer, colon cancer, squamous cell cancer, small-cell lung cancer, non-small cell lung cancer, gastrointestinal cancer, pancreatic cancer, cervical cancer, ovarian cancer, liver cancer, e.g., hepatic carcinoma, bladder cancer, colorectal cancer, endometrial carcinoma, kidney cancer, and thyroid cancer.
Other non-limiting examples of cancers are basal cell carcinoma, biliary tract cancer; bone cancer; brain and CNS cancer; choriocarcinoma; connective tissue cancer; esophageal cancer; eye cancer; cancer of the head and neck; gastric cancer; intra-epithelial neoplasm; larynx cancer; lymphoma including Hodgkin's and Non-Hodgkin's lymphoma; melanoma; myeloma; neuroblastoma; oral cavity cancer (e.g., lip, tongue, mouth, and pharynx); pancreatic cancer; retinoblastoma; rhabdomyosarcoma; rectal cancer; cancer of the respiratory system; sarcoma; skin cancer; stomach cancer; testicular cancer; uterine cancer; cancer of the urinary system, as well as other carcinomas and sarcomas.
As used herein, the term “tumor” refers to all neoplastic cell growth and proliferation, whether malignant or benign, and all pre-cancerous and cancerous cells and tissues. For example, a particular cancer may be characterized by a solid mass tumor. The solid tumor mass, if present, may be a primary tumor mass. A primary tumor mass refers to a growth of cancer cells in a tissue resulting from the transformation of a normal cell of that tissue. In most cases, the primary tumor mass is identified by the presence of a cyst, which can be found through visual or palpation methods, or by irregularity in shape, texture or weight of the tissue. However, some primary tumors are not palpable and can be detected only through medical imaging techniques such as X-rays (e.g., mammography), or by needle aspirations. The use of these latter techniques is more common in early detection. Molecular and phenotypic analysis of cancer cells within a tissue will usually confirm if the cancer is endogenous to the tissue or if the lesion is due to metastasis from another site.
The term alkyl, as used herein, unless otherwise specified, includes a saturated straight, branched, or cyclic, primary, secondary, or tertiary hydrocarbon of for example C₁to C₂₄, and specifically includes methyl, trifluoromethyl, ethyl, propyl, isopropyl, cyclopropyl, butyl, isobutyl, t-butyl, pentyl, cyclopentyl, isopentyl, neopentyl, hexyl, isohexyl, cyclohexyl, cyclohexylmethyl, 3-methylpentyl, 2,2-dimethylbutyl, and 2,3-dimethylbutyl. The alkyl is optionally substituted, e.g., with one or more substituents such as halo (F, Cl, Br or I), (e.g. CF₃, 2-Br-ethyl, CH₂F, CH₂Cl, CH₂CF₃or CF₂CF₃), hydroxyl (e.g. CH₂OH), amino (e.g. CH₂NH₂, CH₂NHCH₃or CH₂N(CH₃)₂), alkylamino, arylamino, alkoxy, aryloxy, nitro, azido (e.g. CH₂N₃), cyano (e.g. CH₂CN), sulfonic acid, sulfate, phosphonic acid, phosphate, or phosphonate, either unprotected, or protected as necessary, as known to those skilled in the art, for example, as taught in Greene et al., Protective Groups in Organic Synthesis, 1991, 2d Ed., John. Wiley and Sons, NY, hereby incorporated by reference.
The term lower alkyl, as used herein, and unless otherwise specified, refers to a C₁to C₄saturated straight, branched, or if appropriate, a cyclic (for example, cyclopropyl) alkyl group, including both substituted and unsubstituted forms.
The term alkylamino or arylamino includes an amino group that has one or two alkyl or aryl substituents, respectively.
The term amino acid includes naturally occurring and synthetic α, β, γ or δ amino acids, and includes but is not limited to, amino acids found in proteins, i.e. glycine, alanine, valine, leucine, isoleucine, methionine, phenylalanine, tryptophan, proline, serine, threonine, cysteine, tyrosine, asparagine, glutamine, aspartate, glutamate, lysine, arginine and histidine. In a preferred embodiment, the amino acid is in the L-configuration. Alternatively, the amino acid can be a derivative of alanyl, valinyl, leucinyl, isoleuccinyl, prolinyl, phenylalaninyl, tryptophanyl, methioninyl, glycinyl, serinyl, threoninyl, cysteinyl, tyrosinyl, asparaginyl, glutaminyl, aspartoyl, glutamyl, lysinyl, argininyl, histidinyl, β-alanyl, β-valinyl, β-leucinyl, β-isoleuccinyl, β-prolinyl, β-phenylalaninyl, β-tryptophanyl, β-methioninyl, β-glycinyl, β-serinyl, β-threoninyl, β-cysteinyl, β-tyrosinyl, β-asparaginyl, β-glutaminyl, β-aspartoyl, β-glutaroyl, β-lysinyl, β-argininyl or β-histidinyl. When the term amino acid is used, it is considered to be a specific and independent disclosure of each of the esters of a natural or synthetic amino acid, including but not limited to α, β, γ or δ glycine, alanine, valine, leucine, isoleucine, methionine, phenylalanine, tryptophan, proline, serine, threonine, cysteine, tyrosine, asparagine, glutamine, aspartate, glutamate, lysine, arginine and histidine in the D and L-configurations.
The term “protected” as used herein and unless otherwise defined includes a group that is added to an oxygen, nitrogen, sulfur or phosphorus atom to prevent its further reaction or for other purposes. A wide variety of oxygen and nitrogen protecting groups are known to those skilled in the art of organic synthesis (see Greene and Wuts, Protective Groups in Organic Synthesis, 1999, 3d Ed., John Wiley & Sons, Inc., NY).
The term aryl, as used herein, and unless otherwise specified, includes phenyl, biphenyl, or naphthyl, and preferably phenyl. The aryl group is optionally substituted with one or more moieties such as halo, hydroxyl, amino, alkylamino, arylamino, alkoxy, aryloxy, nitro, cyano, sulfonic acid, sulfate, phosphonic acid, phosphate, or phosphonate, either unprotected, or protected as necessary, as known to those skilled in the art, for example, as taught in Greene et al., Protective Groups in Organic Synthesis, 1999, 3^rdEd., John Wiley and Sons, NY.
The term alkaryl or alkyl aryl includes an alkyl group with an aryl substituent. The term aralkyl or arylalkyl includes an aryl group with an alkyl substituent.
The term halo, as used herein, includes chloro, bromo, iodo, and fluoro.
The term acyl includes a carboxylic acid ester in which the non-carbonyl moiety of the ester group is selected from straight, branched, or cyclic alkyl or lower alkyl, alkoxyalkyl including methoxymethyl, aralkyl including benzyl, aryloxyalkyl such as phenoxymethyl, aryl including phenyl optionally substituted with halogen, C₁to C₄alkyl or C₁to C₄alkoxy, sulfonate esters such as alkyl or aralkyl sulphonyl including methanesulfonyl, the mono, di or triphosphate ester, trityl or monomethoxytrityl, substituted benzyl, trialkylsilyl (e.g. dimethyl-t-butylsilyl) or diphenylmethylsilyl. Aryl groups in the esters optimally comprise a phenyl group. The term “lower acyl” refers to an acyl group in which the non-carbonyl moiety is lower alkyl.
As used herein, the term “substantially free of” or “substantially in the absence of” with respect to enantiomeric purity, refers to a composition that includes at least 85% or 90% by weight, preferably 95% to 98% by weight, and even more preferably 99% to 100% by weight, of the designated enantiomer. In a preferred embodiment, in the methods and compounds of this invention, the compounds are substantially free of other enantiomers.
Similarly, the term “isolated” refers to a compound composition that includes at least 85% or 90% by weight, preferably 95% to 98% by weight, and even more preferably 99% to 100% by weight, of the compound, the remainder comprising other chemical, species or enantiomers.
The term “independently” is used herein to indicate that the variable, which is independently applied, varies independently from application to application. Thus, in a compound such as R″XYR″, wherein R″ is “independently carbon or nitrogen,” both R″ can be carbon, both R″ can be nitrogen, or one R″ can be carbon and the other R″ nitrogen.
The term “pharmaceutically acceptable salt or prodrug” is used throughout the specification to describe any pharmaceutically acceptable form (such as an ester, phosphate ester, salt of an ester or a related group) of a compound, which, upon administration to a patient, provides the compound. Pharmaceutically acceptable salts include those derived from pharmaceutically acceptable inorganic or organic bases and acids. Suitable salts include those derived from alkali metals such as potassium and sodium, alkaline earth metals such as calcium and magnesium, among numerous other acids well known in the pharmaceutical art. Pharmaceutically acceptable prodrugs refer to a compound that is metabolized, for example hydrolyzed or oxidized, in the host to form the compound of the present invention. Typical examples of prodrugs include compounds that have biologically labile protecting groups on a functional moiety of the active compound. Prodrugs include compounds that can be oxidized, reduced, aminated, deaminated, hydroxylated, dehydroxylated, hydrolyzed, dehydrolyzed, alkylated, dealkylated, acylated, deacylated, phosphorylated, dephosphorylated to produce the active compound.
The term “pharmaceutically acceptable esters” as used herein, unless otherwise specified, includes those esters of one or more compounds, which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of hosts without undue toxicity, irritation, allergic response and the like, are commensurate with a reasonable benefit/risk ratio, and are effective for their intended use.
The term “subject” as used herein refers to an animal, preferably a mammal, most preferably a human. Mammals can include non-human mammals, including, but not limited to, pigs, sheep, goats, cows (bovine), deer, mules, horses, monkeys and other non-human primates, dogs, cats, rats, mice, rabbits or any other known or disclosed herein.

5.2. Compounds of the Invention

The present invention provides for the use of TCN, TCN-P and related compounds in combination with a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, for use in particular therapeutic regimens for the treatment of proliferative disorders.
As used herein and unless otherwise indicated, the term “triciribine compounds” and “triciribine and related compounds” refers to compounds having the following structures:
wherein each R2′, R3′ and R5′ are independently hydrogen, optionally substituted phosphate or phosphonate (including mono-, di-, or triphosphate or a stabilized phosphate prodrug); acyl (including lower acyl); alkyl (including lower alkyl); amide, sulfonate ester including alkyl or arylalkyl; sulfonyl, including methanesulfonyl and benzyl, wherein the phenyl group is optionally substituted with one or more substituents as for example as described in the definition of an aryl given herein; optionally substituted arylsulfonyl; a lipid, including a phospholipid; an amino acid; a carbohydrate; a peptide; or cholesterol; or other pharmaceutically acceptable leaving group that, in vivo, provides a compound wherein R2′, R3′ or R5′ is independently H or mono-, di- or triphosphate;
wherein R^xand R^yare independently hydrogen, optionally substituted phosphate: acyl (including lower acyl); amide, alkyl (including lower alkyl); aromatic, polyoxyalkylene such as polyethyleneglycol, optionally substituted arylsulfonyl; a lipid, including a phospholipid; an amino acid; a carbohydrate; a peptide; or cholesterol; or other pharmaceutically acceptable leaving group. In one embodiment, the compound is administered as a 5′-phosphoether lipid or a 5′-ether lipid.
R₁and R₂each are independently H, optionally substituted straight chained, branched or cyclic alkyl (including lower alkyl), alkenyl, or alkynyl, CO-alkyl, CO-alkenyl, CO-alkynyl, CO-aryl or heteroaryl, CO-alkoxyalkyl, CO-aryloxyalkyl, CO-substituted aryl, sulfonyl, alkylsulfonyl, arylsulfonyl, aralkylsulfonyl.
In one embodiment, R2′ and R3′ are hydrogen. In another embodiment, R2′ and R5′ are hydrogen. In yet another embodiment, R2′, R3′ and R5′ are hydrogen. In yet another embodiment, R2′, R3′, R5′, R1 and R2 are hydrogen.
In another embodiment, the triciribine compound has the following structure:
wherein R₃is H, optionally substituted straight chained, branched or cyclic alkyl (including lower alkyl), alkenyl, or alkynyl, NH₂, NHR⁴, N(R⁴)₂, aryl, alkoxyalkyl, aryloxyalkyl, or substituted aryl; and
each R⁴independently is H, acyl including lower acyl, alkyl including lower alkyl such as but not limited to methyl, ethyl, propyl and cyclopropyl, alkenyl, alkynyl, cycloalkyl, alkoxy, alkoxyalkyl, hydroxyalkyl, or aryl. In a subembodiment, R3 is a straight chained C1-11 alkyl, iso-propyl, t-butyl, or phenyl.
In one embodiment, the triciribine compounds provided herein have the following structure:
In another embodiment, the triciribine compounds provided herein have the following structure:
In another embodiment, the triciribine compounds provided herein have the following structure:
wherein R₆is H, alkyl, (including lower alkyl) alkenyl, alkynyl, alkoxyalkyl, hydroxyalkyl, arylalkyl, cycloalkyl, NH₂, NHR⁴, NR⁴R⁴, CF₃, CH₂OH, CH₂F, CH₂Cl, CH₂CF₃, C(Y³)₃, C(Y³)₂C(Y³)₃, C(═O)OH, C(═O)OR⁴, C(═O)-alkyl, C(═O)-aryl, C(═O)-alkoxyalkyl, C(═O)NH₂, C(═O)NHR⁴, C(═O)N(R⁴)₂, where each Y³is independently H or halo; and
each R⁴independently is H, acyl including lower acyl, alkyl including lower alkyl such as but not limited to methyl, ethyl, propyl and cyclopropyl, alkenyl, alkynyl, cycloalkyl, alkoxy, alkoxyalkyl, hydroxyalkyl, or aryl.
In a subembodiment, R₆is ethyl, CH₂CH₂OH, or CH₂-phenyl.
In another embodiment, the triciribine compounds provided herein have the following structure:
wherein R₇is H, halo, alkyl (including lower alkyl), alkenyl, alkynyl, alkoxy, alkoxyalkyl, hydroxyalkyl, cycloalkyl, nitro, cyano, OH, OR⁴, NH₂, NHR⁴, NR⁴R⁴, SH, SR⁴, CF₃, CH₂OH, CH₂F, CH₂Cl, CH₂CF₃, C(Y³)₃, C(Y³)₂C(Y³)₃, C(O)OH, C(═O)OR⁴, C(═O)-alkyl, C(═O)-aryl, C(═O)-alkoxyalkyl, C(═O)NH₂, C(═O)NHR⁴, C(O)N(R⁴)₂, or N₃, where each Y³is independently H or halo; and
each R⁴independently is H, acyl including lower acyl, alkyl including lower alkyl such as but not limited to methyl, ethyl, propyl and cyclopropyl, alkenyl, alkynyl, cycloalkyl, alkoxy, alkoxyalkyl, hydroxyalkyl.
In a subembodiment, R₇is methyl, ethyl, phenyl, chloro or NH₂.
In another embodiment, the triciribine compounds provided herein have the following structure:
In another embodiment, the triciribine compounds provided herein have the following structure:
As used herein and unless otherwise indicated, the term “a molecule that modulates the HER2/neu (erbB2) receptor” refers to compounds which are recombinant DNA-derived humanized monoclonal antibodies that selectively binds with high affinity in a cell-based assay to the extra-cellular domain of the human epidermal growth factor receptor 2 protein, HER2. In certain embodiments, the antibody is an IgG₁kappa that contains human framework regions with the complementary-determining regions of a murine antibody (4D5) that binds to HER2.
As used herein and unless otherwise indicated, the term “trastuzumab” refers to trastuzumab or a salt thereof. In certain embodiment, the term trastuzumab refers to the compound with the DrugBank accession number BTD00098 and the trade name Herceptin, which is a recombinant humanized monoclonal antibody directed against the human epidermal growth factor receptor 2 (HER2). HER2 is overexpressed by many adenocarcinomas, particularly breast adenocarcinomas. Trastuzumab binds to HER2 on the cell surface of a tumor cell, thereby inducing an antibody-dependent cell-mediated cytotoxicity against tumor cells that overexpress HER2.
It is to be understood that the compounds disclosed herein may contain chiral centers. Such chiral centers may be of either the (R) or (S) configuration, or may be a mixture thereof. Thus, the compounds provided herein may be enantiomerically pure, or be stereoisomeric or diastereomeric mixtures. It is understood that the disclosure of a compound herein encompasses any racemic, optically active, polymorphic, or stereoisomeric form, or mixtures thereof, which preferably possesses the useful properties described herein, it being well known in the art how to prepare optically active forms and how to determine activity using the standard tests described herein, or using other similar tests which are will known in the art. Examples of methods that can be used to obtain optical isomers of the compounds include the following:
(i) physical separation of crystals—a technique whereby macroscopic crystals of the individual enantiomers are manually separated. This technique can be used if crystals of the separate enantiomers exist, i.e., the material is a conglomerate, and the crystals are visually distinct;
(ii) simultaneous crystallization—a technique whereby the individual enantiomers are separately crystallized from a solution of the racemate, possible only if the latter is a conglomerate in the solid state;
(iii) enzymatic resolutions—a technique whereby partial or complete separation of a racemate by virtue of differing rates of reaction for the enantiomers with an enzyme
(iv) enzymatic asymmetric synthesis—a synthetic technique whereby at least one step of the synthesis uses an enzymatic reaction to obtain an enantiomerically pure or enriched synthetic precursor of the desired enantiomer;
(v) chemical asymmetric synthesis—a synthetic technique whereby the desired enantiomer is synthesized from an achiral precursor under conditions that produce asymmetry (i.e., chirality) in the product, which may be achieved using chiral catalysts or chiral auxiliaries;
(vi) diastereomer separations—a technique whereby a racemic compound is reacted with an enantiomerically pure reagent (the chiral auxiliary) that converts the individual enantiomers to diastereomers. The resulting diastereomers are then separated by chromatography or crystallization by virtue of their now more distinct structural differences and the chiral auxiliary later removed to obtain the desired enantiomer;
(vii) first- and second-order asymmetric transformations—a technique whereby diastereomers from the racemate equilibrate to yield a preponderance in solution of the diastereomer from the desired enantiomer or where preferential crystallization of the diastereomer from the desired enantiomer perturbs the equilibrium such that eventually in principle all the material is converted to the crystalline diastereomer from the desired enantiomer. The desired enantiomer is then released from the diastereomer;
(viii) kinetic resolutions—this technique refers to the achievement of partial or complete resolution of a racemate (or of a further resolution of a partially resolved compound) by virtue of unequal reaction rates of the enantiomers with a chiral, non-racemic reagent or catalyst under kinetic conditions;
(ix) enantiospecific synthesis from non-racemic precursors—a synthetic technique whereby the desired enantiomer is obtained from non-chiral starting materials and where the stereochemical integrity is not or is only minimally compromised over the course of the synthesis;
(x) chiral liquid chromatography—a technique whereby the enantiomers of a racemate are separated in a liquid mobile phase by virtue of their differing interactions with a stationary phase. The stationary phase can be made of chiral material or the mobile phase can contain an additional chiral material to provoke the differing interactions;
(xi) chiral gas chromatography—a technique whereby the racemate is volatilized and enantiomers are separated by virtue of their differing interactions in the gaseous mobile phase with a column containing a fixed non-racemic chiral adsorbent phase;
(xii) extraction with chiral solvents—a technique whereby the enantiomers are separated by virtue of preferential dissolution of one enantiomer into a particular chiral solvent;
(xiii) transport across chiral membranes—a technique whereby a racemate is placed in contact with a thin membrane barrier. The barrier typically separates two miscible fluids, one containing the racemate, and a driving force such as concentration or pressure differential causes preferential transport across the membrane barrier. Separation occurs as a result of the non-racemic chiral nature of the membrane which allows only one enantiomer of the racemate to pass through.
In some embodiments, triciribine, triciribine phosphate (TCN-P), triciribine 5′-phosphate (TCN-P), or the DMF adduct of triciribine (TCN-DMF) are provided. TCN can be synthesized by any technique known to one skilled in the art, for example, as described in Tetrahedron Letters, 1971. 49: p. 4757-4760. TCN-P can be prepared by any technique known to one skilled in the art, for example, as described in U.S. Pat. No. 4,123,524. The synthesis of TCN-DMF is described, for example, in INSERM, 1978. 81: p. 37-82. Other compounds related to TCN as described herein can be synthesized, for example, according to the methods disclosed in Gudmundsson K. S. et al., Nucleosides Nucleotides Nucleic Acids, 2001. 20(10-11): p. 1823-1830; Porcari A. R. et al., J Med Chem, 2000. 43(12): p. 2457-2463; Porcari A. R. et al., Nucleosides Nucleotides, 1999. 18(11-12): p. 2475-2497; Porcari A. R. et al., J Med Chem, 2000. 43(12): p. 2438-2448; Porcari A. R. et al., Nucleosides Nucleotides Nucleic Acids, 2003. 22(12): p. 2171-2193; Porcari A. R. et al. Nucleosides Nucleotides Nucleic Acids, 2004. 23(1-2): p. 31-39; Schweinsberg P. D. et al., Biochem Pharmacol, 1981. 30(18): p. 2521-2526; Smith K. L. et al., Bioorg Med Chem Lett, 2004. 14(13): p. 3517-3520; Townsend L. B. et al., Nucleic Acids Symp Ser, 1986. 1986(17): p. 41-44; and/or Wotring L. L. et al., Cancer Treat Rep, 1986. 70(4): p. 491-7.

5.3. Pharmaceutically Acceptable Salts and Prodrugs

In cases where compounds are sufficiently basic or acidic to form stable nontoxic acid or base salts, administration of the compound as a pharmaceutically acceptable salt may be appropriate. Pharmaceutically acceptable salts include those derived from pharmaceutically acceptable inorganic or organic bases and acids. Suitable salts include those derived from alkali metals such as potassium and sodium, alkaline earth metals such as calcium and magnesium, among numerous other acids well known in the pharmaceutical art. In particular, examples of pharmaceutically acceptable salts are organic acid addition salts formed with acids, which form a physiological acceptable anion, for example, tosylate, mefhanesulfonate, acetate, citrate, malonate, tartarate, succinate, benzoate, ascorbate, α-ketoglutarate, and α-glycerophosphate. Suitable inorganic salts may also be formed, including, sulfate, nitrate, bicarbonate, and carbonate salts.
Pharmaceutically acceptable salts may be obtained using standard procedures well known in the art, for example reacting a sufficiently basic compound such as an amine with a suitable acid affording a physiologically acceptable anion. Alkali metal (for example, sodium, potassium or lithium) or alkaline earth metal (for example calcium) salts of carboxylic acids can also be made.
Any of the nucleotides described herein can be administered as a nucleotide prodrug to increase the activity, bioavailability, stability or otherwise alter the properties of the nucleoside. A number of nucleotide prodrug ligands are known. In general, alkylation, acylation or other lipophilic modification of the mono, di or triphosphate of the nucleoside will increase the stability of the nucleotide. Examples of substituent groups that can replace one or more hydrogens on the phosphate moiety are alkyl, aryl, steroids, carbohydrates, including sugars, 1,2-diacylglycerol and alcohols. Many are described in R. Jones and N. Bischofberger, Antiviral Research, 1995. 27: p. 1-17. Any of these can be used in combination with the disclosed nucleosides to achieve a desired effect.
In one embodiment, the triciribine or a related compound is provided as 5′-hydroxyl lipophilic prodrug. Nonlimiting examples of U.S. patents that disclose suitable lipophilic substituents that can be covalently incorporated into the nucleoside, preferably at the 5′-OH position of the nucleoside or lipophilic preparations, include U.S. Pat. Nos. 5,149,794, 5,194,654, 5,223,263, 5,256,641, 5,411,947, 5,463,092, 5,543,389, 5,543,390, 5,543,391, and 5,554,728, all of which are incorporated herein by reference.
Foreign patent applications that disclose lipophilic substituents that can be attached to the triciribine or a related compound s of the present invention, or lipophilic preparations, include WO 89/02733, WO 90/00555, WO 91/16920, WO 91/18934, WO 93/00910, WO 94/26273, WO/15132, EP 0 350 287, EP 93917054.4, and WO 91/19723.
Additional nonlimiting examples of derivatives of triciribine or related compounds are those that contain substituents as described in the following publications. These derivatized triciribine or related compounds can be used for the indications described in the text or otherwise as antiviral agents, including as anti-HIV or anti-HBV agents. Ho D. H. W., Cancer Res., 1973 33: p. 2816-2820; Holy A. in Advances in Antiviral Drug Design, Vol. I, De Clercq (ed.), JAI Press, pp. 179-231; Hong C. I. et al. Biochem Biophys Rs Commun, 1979. 88: p. 1223-1229; Hong C. I. et al., J Med Chem, 1980. 28: p. 171-177; Hostetler K. Y. et al., J Biol Chem, 1990. 266: p. 11714-11717; Hostetler K. Y. et al, Antiviral Res, 1994. 24: p. 59-67; Hostetler K. Y. et al, Antimicrobial Agents Chemother, 1994. 38: p. 2792-2797; Hunston R. N. et al, J Med Chem, 1984. 27; p. 440-444; Ji Y. H. et al, J Med Chem, 1990. 33: p. 2264-2270; Jones A. S. et al., J Chem Soc Perkin Trans, 1984. J: p. 1471-1474; Juodka B. A. and Smart J., Coll Czech Chem Comm, 1974. 39: p. 363-968; Kataoka S. et al, Nucleic Acids Res Sym Ser, 1989. 21: p, 1-2; Kataoka S. et al, Heterocycles, 1991. 32: p. 1351-1356; Kinchington D. et al, Antiviral Chem Chemother, 1992. 3: p. 107-112; Kodama K. et al., Jpn J Cancer Res, 1989. 80: p. 679-685; Korty M. and Engels J., Naunyn-Schmiedeberg's Arch Pharmacol, 1979. 10: p. 103-111; Kumar A. et al., J Med Chem, 1990. 33: p. 2368-2375; LeBec C. and Huynh-dinh T., Tetrahedron Lett, 1991. 32: p. 6553-6556; Lichtenstein J. et al., J Biol Chem, 1960. 235: p. 457-465; Lucthy J, et al., Mitt Geg Lebensmittelunters Hyg, 1981. 72: p. 131-133 (Chem. Abstr. 95, 127093); McGuigan C. et al., Nucleic Acids Res, 1989. 17: p. 6065-6075; McGuigan C. et al., Antiviral Chem Chemother, 1990. 1: p. 107-113; McGuigan C. et al, Antiviral Chem Chemother, 1990. 1: p. 355-360; McGuigan C. et al., Antiviral Chem Chemother, 1990. 1: p. 25-33; McGuigan C. et al., Antiviral Res, 1991. 15: p. 255-263; McGuigan C. et al., Antiviral Res, 1992. 17: p. 311-321; McGuigan C. et al., Antiviral Chem Chemother, 1993. 4: p. 97-101; McGuigan C. et al., J Med Chem, 1993. 36: p. 1048-1052.
Alkyl hydrogen phosphonate derivatives of the anti-HIV agent AZT may be less toxic than the parent nucleoside analogue. Antiviral Chem Chemother. 5: 271-277; Meyer R. B. et al., Tetrahedron Lett, 1973. 269-272; Nagyvary J. et al., Biochem Biophys Res Commun, 1973. 55: p. 1072-1077; Namane A. et al., J Med Chem, 1992. 35: p. 3939-3044; Nargeot J. et al., Natl. Acad. Sci. U.S.A., 1983. 80: p. 2395-2399; Nelson K. A. et al., J Am Chem Soc, 1987. 109: p. 4058-4064; Nerbonne J. M. et al., Nature, 1984. 301: p. 74-76; Neumann J. M. et al., J Am Chem Soc, 1 1989. 111: p. 4270-4277; Ohno R. et al., Oncology, 1991. 48: p. 451-455. Palomino E. et al., J Med Chem, 1989. 32: p. 622-625; Perkins R. M. et al., Antiviral Res, 1993. 20(Suppl. I): p. 84; Piantadosi C, et al., J Med Chem, 1991. 34: 1408-1414; Pompon A. et al., Antiviral Chem Chemother, 1994. 5: p. 91-98; Postemark T., Anu Rev Pharmacol, 1974. 14: p. 23-33; Prisbe E. J. et al., J Med Chem, 1986. 29: p. 671-675; Pucch F. et al., Antiviral Res, 1993. 22: p. 155-174; Pugaeva V. P. et al., Gig Trf Prof Zabol, 1969. 13: p. 47-48 (Chem. Abstr. 72, 212); Robins R. K., Pharm Res, 1984. 11-18; Rosowsky A. et al., J Med Chem, 1982. 25: p. 171-178; Ross W., Biochem Pharm, 1961. 8: p. 235-240; Ryu E. K. et al., J Med Chem, 1982. 25: p. 1322-1329; Saffhill R. and Hume W. J., Chem Biol Interact, 1986. 57: p. 347-355; Saneyoshi M. et al., Chem Pharm Bull, 1980. 28: p, 2915-2923; Sastry J. K. et al., Mol Pharmacol, 1992. 41: p. 441-445; Shaw J. P. et al., 9th Annual AAPS Meeting, 1994. San Diego, Calif. (Abstract). Shuto S. et al., Tetrahedron Lett, 1987. 28: p. 199-202; Shuto S. et al., Chem Pharm Bull, 1988. 36: p. 209-217. One preferred phosphate prodrug group is the S-acyl-2-thioethyl group, also referred to as “SATE.”
Additional examples of prodrugs that can be used are those described in the following patents and patent applications: U.S. Pat. Nos. 5,614,548, 5,512,671, 5,770,584, 5,962,437, 5,223,263, 5,817,638, 6,252,060, 6,448,392, 5,411,947, 5,744,592, 5,484,809, 5,827,831, 5,696,277, 6,022,029, 5,780,637, 5,194,654, 5,463,092, 5,744,461, 4,444,766, 4,562,179, 4,599,205, 4,493,832, 4,221,732, 5,116,992, 6,429,227, 5,149,794, 5,703,063, 5,888,990, 4,810,697, 5,512,671, 6,030,960, 2004/0259845, 6,670,341, 2004/0161398, 2002/082242, 5,512,671, 2002/0082242, and or PCT Publication Nos WO 90/11079, WO 96/39197, and/or WO 93/08807.

5.4. In Vivo Efficacy/Dosing Regimens

In another aspect of the present invention, dosing regimens are provided that limit the toxic side effects of TCN and related compounds. In one embodiment, such dosing regimens minimize the following toxic side effects, including, but not limited to, hepatoxicity, thrombocytopenia, hyperglycemia, vomiting, hypocalcemia, anemia, hypoalbunemia, myelosuppression, hypertriglyceridemia, hyperamylasemia, diarrhea, stomachitis and/or fever.
In another embodiment, the administration of TCN, TCN-P or related compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, provides at least a partial or complete response in vivo in at least 15-20% of the subjects. In particular embodiments, a partial response can be at least 15, 20, 25, 30, 35, 40, 50, 55, 60, 65, 70, 75, 80 or 85% regression of the minor. In other embodiments, this response can be evident in at least 15, 15, 20, 25, 30, 35, 40, 50, 55, 60, 65, 70, 75, 80, 85 or 90% of the subjects treated with the therapy. In further embodiments, such response rates can be obtained by any therapeutic regimen disclosed herein.
In other embodiments, methods are provided to treat a subject that has been diagnosed with cancer by administering to the subject an effective amount of TCN, TCN-P or a related compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, according to a dosing schedule that includes administering the triciribine compound and/or a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, one time per week for three weeks followed by a one week period wherein the drug is not administered (i.e., via a 28 day cycle). In other embodiments, such 28 day cycles can be repeated at least 2, 3, 4, or 5 times or until regression of the tumor is evident.
In further embodiments, a 42 day cycle is provided in which the compounds disclosed herein can be administered once a week for four weeks followed by a two week period in which the triciribine compound and/or a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, is not administered. In other embodiments, such 42 day cycles can be repeated at least 2, 3, 4, or 5 times or until regression of the tumor is evident. In a particular embodiment, less than 12, less than 11 or less than 10 mg/m²of TCN, TCN-P or a related compound can be administered according to a 42 day cycle. In other particular embodiments, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 15 mg/m²of TCN, TCN-P or a related compound can be administered according to a 42 day cycle. In another particular embodiment, about 1 to about 50 mg of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, is administered. In a particular embodiment, 1, 5, 10, 15, 20, 25, 30, 35, or 40 mg of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered according to a 42 day cycle.
In another embodiment, methods are provided to treat cancer in a subject by administering to the subject a dosing regimen of 10 mg/m²or less of TCN, TCN-P or a related compound and less than about 30 mg of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, one time per week. In particular embodiments, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8, 5, 9, 9, 5 or 10 mg/m²of TCN, TCN-P or a related compound as disclosed herein can be administered one time per week In another particular embodiment, 1, 5, 10, 15, 20, 25, 30, 35, or 40 mg of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered one time per week.
In embodiments of the present invention, the compounds disclosed herein can be administered simultaneously as a single bolus dose over a short period of time, for example, about 5, 10, 15, 20, 30 or 60 minutes. In further embodiments, dosing schedules are provided in which the compounds are administered simultaneously via continuous infusion for at least 24, 48, 72, 96, or 120 hours. In certain embodiments, the administration of the triciribine compound and/or a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, via continuous or bolus injections can be repeated at a certain frequency at least: once a week, once every two weeks, once every three weeks, once a month, once every five weeks, once every six weeks, once every eight weeks, once every ten weeks and/or once every twelve weeks. The type and frequency of administrations can be combined in any manner disclosed herein to create a dosing cycle. The triciribine compound and/or a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be repeatedly administered via a certain dosing cycles, for example as a bolus injection once every two weeks for three months. The dosing cycles can be administered for at least: one, two three, four five, six, seven, eight, nine, ten, eleven, twelve, eighteen or twenty four months. Alternatively, at least 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15 or 20 dosing cycles can be administered to a patient. The triciribine compound and/or a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered according to any combination disclosed herein, for example, the triciribine compound and/or a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered once a week every three weeks for 3 cycles.
In further embodiments, the compounds can be administered separately at least once a day for at least 2, 3, 4, 5, 6, 7, 8, 9 or 10 days. Such administration can be followed by corresponding periods in which the triciribine compound and/or a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, are not administered
The TCN, TCN-P and related compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, as disclosed herein can be administered to patients in an amount that is effective in causing tumor regression. The administration of TCN, TCN-P or related compounds and trastuzumab or a salt thereof can provide at least a partial, such as at least 15, 20 or 30%, or complete response in vivo in at least 15-20% of the subjects. In certain embodiments, at least 2, 5, 10, 15, 20, 30 or 50 mg/m²of a triciribine compound disclosed herein can be administered to a subject. In certain embodiments, at least about 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4, 5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9, 5, 10, 12, 15, 17, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 150, 165, 175, 200, 250, 300, or 350 mg/m²of TCN, TCN-P or a related compound disclosed herein can be administered to a subject. In certain embodiments, 1, 5, 10, 15, 20, 25, 30, 35, or 40 mg of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered to a subject.
The administration of the compound can be conducted according to any of the therapeutic regimens disclosed herein. In particular embodiments, the dosing regimen includes administering less than about 20 mg/m²of TCN and related compounds and less than about 30 mg of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, either concurrently, sequentially, or conducted over a period of time. In one embodiment, less than 20 mg/m²of TCN or related compounds can be administered once a week concurrently with less than about 30 mg of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof. In another embodiment, less than 20 mg/m²of TCN or related compounds can be administered once a week and less than about 30 mg of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered the following week.
In further embodiments, 2 mg/m², 5 mg/m², 10 mg/m², and/or 15 mg/m²of TCN or a related compound and less than about 300, 250, 200, 150, or 100 mg of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered to a subject. In another embodiment, less than 10 mg/m²of a triciribine compound and less than about 300 mg of a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered to a subject via continuous infusion for at least five days. The present invention provides for any combination of dosing type, frequency, number of cycles and dosage amount disclosed herein.

5.5. Screening of Patient Populations

In another aspect of the present invention, methods are provided to identify cancers or tumors that are susceptible to the toxic effects of triciribine (TCN) and related compounds. In one embodiment, methods are provided to treat a cancer or tumor in a mammal by (i) obtaining a biological sample from the tumor; (ii) determining whether the cancer or tumor overexpresses Akt kinase or hyperactivated and phosphorylated Akt kinase, and (iii) treating the cancer or tumor with triciribine or a related compound as described herein. In one embodiment, the biological sample can be a biopsy. In other embodiments, the biological sample can be fluid, cells and/or aspirates obtained from the tumor or cancer.
The biological sample can be obtained according to any technique known to one skilled in the art. In one embodiment, a biopsy can be conducted to obtain the biological sample. A biopsy is a procedure performed to remove tissue or cells from the body for examination. Some biopsies can be performed in a physician's office, while others need to be done in a hospital setting. In addition, some biopsies require use of an anesthetic to numb the area, while others do not require any sedation. In certain embodiments, an endoscopic biopsy can be performed. This type of biopsy is performed through a fiberoptic endoscope (a long, thin tube that has a close-focusing telescope on the end for viewing) through a natural body orifice (i.e., rectum) or a small incision (i.e., arthroscopy). The endoscope is used to view the organ in question for abnormal or suspicious areas, in order to obtain a small amount of tissue for study. Endoscopic procedures are named for the organ or body area to be visualized and/or treated. The physician can insert the endoscope into the gastrointestinal tract (alimentary tract endoscopy), bladder (cystoscopy), abdominal cavity (laparoscopy), joint cavity (arthroscopy), mid-portion of the chest (mediastinoscopy), or trachea and bronchial system (laryngoscopy and bronchoscopy).
In another embodiment, a bone marrow biopsy can be performed. This type of biopsy can be performed either from the sternum (breastbone) or the iliac crest hipbone (the bone area on either side of the pelvis on the lower back area). The skin is cleansed and a local anesthetic is given to numb the area. A long, rigid needle is inserted into the marrow, and cells are aspirated for study; this step is occasionally uncomfortable. A core biopsy (removing a small bone ‘chip’ from the marrow) may follow the aspiration.
In a further embodiment, an excisional or incisional biopsy can be performed on the mammal. This type of biopsy is often used when a wider or deeper portion of the skin is needed. Using a scalpel (surgical knife), a full thickness of skin is removed for further examination, and the wound is sutured (sewed shut with surgical thread). When the entire tumor is removed, it is referred to as an excisional biopsy technique. If only a portion of the tumor is removed, it is referred to as an incisional biopsy technique. Excisional biopsy is often the method usually preferred, for example, when melanoma (a type of skin cancer) is suspected.
In still further embodiments, a fine needle aspiration (FNA) biopsy can be used. This type of biopsy involves using a thin needle to remove very small pieces from a tumor. Local anesthetic is sometimes used to numb the area, but the test rarely causes much discomfort and leaves no scar. FNA is not, for example, used for diagnosis of a suspicious mole, but may be used, for example, to biopsy large lymph nodes near a melanoma to see if the melanoma has metastasized (spread). A computed tomography scan (CT or CAT scan) can be used to guide a needle into a tumor in an internal organ such as the lung or liver.
In other embodiments, punch shave and/or skin biopsies can be conducted. Punch biopsies involve taking a deeper sample of skin with a biopsy instrument that removes a short cylinder, or “apple core,” of tissue. After a local anesthetic is administered, the instrument is rotated on the surface of the skin until it cuts through all the layers, including the dermis, epidermis, and the most superficial parts of the subcutis (fat). A shave biopsy involves removing the top layers of skin by shaving it off. Shave biopsies are also performed with a local anesthetic. Skin biopsies involve removing a sample of skin for examination under the microscope to determine if, for example, melanoma is present. The biopsy is performed under local anesthesia.
In particular embodiment, methods are provided to determine whether the tumor overexpresses an Akt kinase, Akt kinase overexpression can refer to the phosphorylation state of the kinase. Hyperphosphorylation of Akt can be detected according to the methods described herein. In one embodiment, a tumor biopsy can be compared to a control tissue. The control tissue can be a normal tissue from the mammal in which the biopsy was obtained or a normal tissue from a healthy mammal. Akt kinase overexpression or hyperphosphorylation can be determined if the tumor biopsy contains greater amounts of Akt kinase and/or Akt kinase phosphorylation than the control tissue, such as, for example, at least approximately 1.5, 2, 2.25, 2.5, 2.75, 3, 3.25, 3.5, 3.75, 4, 4.25, 4.5, 4.75, 5, 5.5, 6, 7, 8, 9, or 10-fold greater amounts of Akt kinase than contained in the control tissue.
In one embodiment, the present invention provides a method to detect aberrant Akt kinase expression in a subject or in a biological sample from the subject by contacting cells, cell extracts, serum or other sample from the subjects or said biological sample with an immunointeractive molecule specific for an Akt kinase or antigenic portion thereof and screening for the level of immunointeractive molecule-Akt kinase complex formation, wherein an elevated presence of tire complex relative to a normal cell is indicative of an aberrant cell that expresses or overexpresses Akt. In one example, cells or cell extracts can be screened immunologically for the presence of elevated levels of Akt kinase.
In an alternative embodiment, the aberrant expression of Akt in a cell is detected at the genetic level by screening for the level of expression of a gene encoding an Akt kinase wherein an elevated level of a transcriptional expression product (i.e., mRNA) compared to a normal cell is indicative of an aberrant cell. In certain embodiments, real-time PCR as well as other PCR procedures can be used to determine transcriptional activity. In one embodiment, mRNA can be obtained from cells of a subject or from a biological sample from a subject and cDNA optionally generated. The mRNA or cDNA can then be contacted with a genetic probe capable of hybridizing to and/or amplifying all or part of a nucleotide sequence encoding Akt kinase or its complementary nucleotide sequence and then the level of the mRNA or cDNA can be detected wherein the presence of elevated levels of the mRNA or cDNA compared to normal controls can be assessed.
Yet another embodiment of the present invention contemplates the use of an antibody, monoclonal or polyclonal, to Akt kinase in a quantitative or semi-quantitative diagnostic kit to determine relative levels of Akt kinase in suspected cancer cells from a patient, which can include all the reagents necessary to perform the assay. In one embodiment, a kit utilizing reagents and materials necessary to perform an ELISA assay is provided. Reagents can include, for example, washing buffer, antibody dilution buffer, blocking buffer, cell staining solution, developing solution, stop solution, anti-phospho-protein specific antibodies, anti-Pan protein specific antibodies, secondary antibodies, and distilled water. The kit can also include instructions for use and can optionally be automated or semi-automated or in a form which is compatible with automated machine or software. In one embodiment, a phosphor-ser-473 Akt antibody that detects the activated form of AKT (Akt phosphorylated at serine 474) can be utilized as the antibody in a diagnostic kit. See, for example, Yuan et al., Oncogene, 2000, 19: p. 2324-2330.

5.6. Akt Kinases

Akt, also named PKB³, represents a subfamily of the serine/threonine kinase. Three members, AKT1, AKT2, and AKT3, have been identified in this subfamily. Akt is activated by extracellular stimuli in a PI3K-dependent manner (Datta S. R. et al., Genes Dev, 1999. 13: p. 2905-2927). Full activation of Akt requires phosphorylation of Thr³⁰⁸in the activation loop and Ser⁴⁷³in the C-terminal activation domain. Akt is negatively regulated by PTEN tumor suppressor. Mutations in PTEN have been identified in various tumors, which lead to activation of Akt pathway (Datta S. R. et al., Genes Dev, 1999. 13: p. 2905-2927). In addition, amplification, overexpression and/or activation of Akt have been detected in a number of human malignancies (Datta S. R. et al., Genes Dev, 1999. 13: p. 2905-2927); Cheng J. Q. and Nicosia S. V., in Encyclopedic Reference of Cancer, 2001, Schwab D. (ed.) Springer, Berlin Heidelberg and New York: pp 35-7). Ectopic expression of Akt, especially constitutively active Akt, induces cell survival and malignant transformation whereas inhibition of Akt activity stimulates apoptosis in a range of mammalian cells (Datta S. R. et al., Genes Dev, 1999. 13: p. 2905-2927); Cheng J. Q. and Nicosia S. V., in Encyclopedic Reference of Cancer, 2001, Schwab D. (ed.) Springer, Berlin Heidelberg and New York: pp 35-7; Sun M. et al., Am J Path, 2001. 159: p. 431-437; Cheng J. Q. et al., Oncogene, 1997. 14: p. 2793-2801). Further, activation of Akt has been shown to associate with tumor invasiveness and chemoresistance (West K. A. et al., Drug Resist Updat, 2002. 5: p. 234-248).
Activation of the Akt pathway plays a pivotal role in malignant transformation and chemoresistance by inducing cell survival, growth, migration, and angiogenesis. The present invention provides methods to determine levels of Akt kinase overexpression and/or hyperactivated and phosphorylated Akt kinase.
The Akt kinase can be any known Akt family kinase, or kinase related thereto, including, but not limited to Akt 1, Akt 2, Akt 3. The mRNA and amino acid sequences of human Akt1, Akt2, and Akt 3 are illustrated in FIGS. 6 a-c, 7 a-d, and 8 a-c, respectively.

5.7. Diagnostic Assays

Immunological Assays
In one embodiment, a method is provided for detecting the aberrant expression of an Akt kinase in a cell in a mammal or in a biological sample from the mammal, by contacting cells, cell extracts or serum or other sample from the mammal or biological sample with an immunointeractive molecule specific for an Akt kinase or antigenic portion thereof and screening for the level of immunointeractive molecule-Akt kinase complex formations and determining whether an elevated presence of the complex relative to a normal cell is present.
The immunointeractive molecule can be a molecule having specificity and binding affinity for an Akt kinase or its antigenic parts or its homologs or derivatives thereof. In one embodiment, the immunointeractive molecule can be an immunoglobulin molecule. In other embodiments, the immunointeractive molecules can be an antibody fragments, single chain antibodies, and/or deimmunized molecules including humanized antibodies and T-cell associated antigen-binding molecules (TABMs). In one particular embodiment, the antibody can be a monoclonal antibody. In another particular embodiment, the antibody can be a polyclonal antibody. The immunointeractive molecule can exhibit specificity for an Akt kinase or more particularly an antigenic determinant or epitope on an Akt kinase. An antigenic determinant or epitope on an Akt kinase includes that part of the molecule to which an immune response is directed. The antigenic determinant or epitope can be a B-cell epitope or where appropriate a T-cell epitope. In one embodiment, the antibody is a phosphor-ser 473 Akt antibody.
One embodiment of the present invention provides a method for diagnosing the presence of cancer or cancer-like growth in a mammal, in which aberrant Akt activity is present, by contacting cells or cell extracts from the mammal or a biological sample from the subject with an Akt kinase-binding effective amount of an antibody having specificity for the Akt kinase or an antigenic determinant or epitope thereon and then quantitatively or qualitatively determining the level of an Akt kinase-antibody complex wherein the presence of elevated levels of said complex compared to a normal cell is determined.
Antibodies can be prepared by any of a number of means known to one skilled in the art. For example, for the detection of human Akt kinase, antibodies can be generally but not necessarily derived from non-human animals such as primates, livestock animals (e.g. sheep, cows, pigs, goats, horses), laboratory test animals (e.g. mice, rats, guinea pigs, rabbits) and/or companion animals (e.g. dogs, cats). Antibodies may also be recombinantly produced in prokaryotic or eukaryotic host cells. Generally, antibody based assays can be conducted in vitro on cell or tissue biopsies. However, if an antibody is suitably deimmunized or, in the case of human use, humanized, then the antibody can be labeled with, for example, a nuclear tag, administered to a patient and the site of nuclear label accumulation determined by radiological techniques. The Akt kinase antibody can be a cancer targeting agent. Accordingly, another embodiment of the present invention provides deimmunized forms of the antibodies for use in cancer imaging in human and non-human patients.
In general, for the generation of antibodies to an Akt kinase, the enzyme is required to be extracted from a biological sample whether this be from animal including human tissue or from cell culture if produced by recombinant means. The Akt kinase can be separated from the biological sample by any suitable means. For example, the separation may take advantage of any one or more of the Akt kinase's surface charge properties, size, density, biological activity and its affinity for another entity (e.g. another protein or chemical compound to which it binds or otherwise associates). Thus, for example, separation of the Akt kinase from the biological fluid can be achieved by any one or more of ultra-centrifugation, ion-exchange chromatography (e.g. anion exchange chromatography, cation exchange chromatography), electrophoresis (e.g. polyacrylamide gel electrophoresis, isoelectric focussing), size separation (e.g., gel filtration, ultra-filtration) and affinity-mediated separation (e.g. immunoaffinity separation including, but not limited to, magnetic bead separation such as Dynabead (trademark) separation, immunochromatography, immuno-precipitation). The separation of Akt kinase from the biological fluid can preserve conformational epitopes present on the kinase and, thus, suitably avoids techniques that cause denaturation of the enzyme. In a further embodiment, the kinase can be separated from the biological fluid using any one or more of affinity separation, gel filtration and/or ultra-filtration.
Immunization and subsequent production of monoclonal antibodies can be earned out using standard protocols known in the art, such as, for example, described by Kohler and Milstein (Kohler and Milstein, Nature, 1975. 256: p. 495-499; Kohler and Milstein, Eur J Immunol, 1976. 6(7): p. 511-519; Coligan et al., (Current Protocols in Immunology, 1991-1997, John Wiley & Sons, Inc.) or Toyama et al. (Monoclonal Antibody, Experiment Manual, 1987, Kodansha Scientific). Essentially, an animal is immunized with an Akt kinase-containing biological fluid or fraction thereof or a recombinant form of Akt kinase by standard methods to produce antibody-producing cells, particularly antibody-producing somatic cells (e.g. B lymphocytes). These cells can then be removed from the immunized animal for immortalization. In certain embodiment, a fragment of an Akt kinase can be used to the generate antibodies. The fragment can be associated with a carrier. The carrier can be any substance of typically high molecular weight to which a non- or poorly immunogenic substance (e.g. a hapten) is naturally or artificially linked to enhance its immunogenicity.
Immortalization of antibody-producing cells can be carried out using methods which are well-known in the art. For example, the immortalization may be achieved by the transformation method using Epstein-Barr virus (EBV) (Kozbor et al., Methods in Enzymology, 1986. 123: p. 140). In another embodiment, antibody-producing cells are immortalized using the cell fusion method (described in Coligan et al., 1991-1997, supra), which is widely employed for the production of monoclonal antibodies. In this method, somatic antibody-producing cells with the potential to produce antibodies, particularly B cells, are fused with a myeloma cell line. These somatic cells may be derived from the lymph nodes, spleens and peripheral blood of primed animals, preferably rodent animals such as mice and rats. In a particular embodiment, mice spleen cells can be used. In other embodiments, rat, rabbit, sheep or goat cells can also be used. Specialized myeloma cell lines have been developed from lymphocytic tumours for use in hybridoma-producing fusion procedures (Kohler and Milstein, 1976, supra; Shulman et al., Nature, 1978. 276: p. 269-270; Volk et al., J Virol, 1982. 42(1): p. 220-227). Many myeloma cell lines can also be used for the production of fused cell hybrids, including, e.g. P3.times.63-Ag8, P3.times.63-AG8.653, P3/NS1-Ag4-1 (NS-1), Sp2/0-Ag14 and S194/5.XXO.Bu.1. The P3.times.63-Ag8 and NS-1 cell lines have been described by Kohler and Milstein (1976, supra). Shulman et al. (1978, supra) developed the Sp2/0-Ag14 myeloma line. The S194/5.XXO.Bu.1 line was reported by Trowbridge (J Exp Med, 1978. 148(1): p. 313-323). Methods for generating hybrids of antibody-producing spleen or lymph node cells and myeloma cells usually involve mixing somatic cells with myeloma cells in a 10:1 proportion (although the proportion may vary from about 20:1 to about 1:1), respectively, in the presence of an agent or agents (chemical, viral or electrical) that promotes the fusion of cell membranes. Fusion methods have been described (Kohler and Milstein, 1975, supra; Kohler and Milstein, 1976, supra; Gefter et al., Somatic Cell Genet, 1977. 3: p. 231-236; Volk et al., 1982, supra). The fusion-promoting agents used by those investigators were Sendai virus and polyethylene glycol (PEG). In certain embodiments, means to select the fused cell hybrids from the remaining unfused cells, particularly the unfused myeloma cells, are provided. Generally, the selection of fused cell hybrids can be accomplished by culturing the cells in media that support the growth of hybridomas but prevent the growth of the unfused myeloma cells, which normally would go on dividing indefinitely. The somatic cells used in the fusion do not maintain long-terra viability in in vitro culture and hence do not pose a problem. Several weeks are required to selectively culture the fused cell hybrids. Early in this time period, it is necessary to identify those hybrids which produce the desired antibody, so that they may subsequently be cloned and propagated. Generally, around 10% of the hybrids obtained produce the desired antibody, although a range of from about 1 to about 30% is not uncommon. The detection of antibody-producing hybrids can be achieved by any one of several standard assay methods, including enzyme-linked immunoassay and radioimmunoassay techniques as, for example, described in Kennet et al. (Monoclonal Antibodies and Hybridomas: A New Dimension in Biological Analyses, 1980, Plenum Press, New York, p. 376-384) and by FACS analysis (O'Reilly et al., Biotechniques, 1998 25: p. 824-830).
Once the desired fused cell hybrids have been selected and cloned into individual antibody-producing cell lines, each cell line may be propagated in either of two standard ways. A suspension of the hybridoma cells can be injected into a histocompatible animal. The injected animal will then develop tumours that secrete the specific monoclonal antibody produced by the fused cell hybrid. The body fluids of the animal, such as serum or ascites fluid, can be tapped to provide monoclonal antibodies in high concentration. Alternatively, the individual cell lines may be propagated in vitro in laboratory culture vessels. The culture medium containing high concentrations of a single specific monoclonal antibody can be harvested by decantation, filtration or centrifugation, and subsequently purified.
The cell lines can then be tested for their specificity to detect the Akt kinase of interest by any suitable immunodetection means. For example, cell lines can be aliquoted into a number of wells and incubated and the supernatant from each well is analyzed by enzyme-linked immunosorbent assay (ELISA), indirect fluorescent antibody technique, or the like. The cell line(s) producing a monoclonal antibody capable of recognizing the target LIM kinase but which does not recognize non-target epitopes are identified and then directly cultured in vitro or injected into a histocompatible animal to form tumours and to produce, collect and purify the required antibodies.
The present invention provides, therefore, a method of detecting in a sample an Akt kinase or fragment, variant or derivative thereof comprising contacting the sample with an antibody or fragment or derivative thereof and detecting the level of a complex containing the antibody and Akt kinase or fragment, variant or derivative thereof compared to normal controls wherein elevated levels of Akt kinase is determined. Any suitable technique for determining formation of the complex may be used. For example, an antibody according to the invention, having a reporter molecule associated therewith, may be utilized in immunoassays. Such immunoassays include but are not limited to radioimmunoassays (RIAs), enzyme-linked immunosorbent assays (ELISAs) immunochromatographic techniques (ICTs), and Western blotting which are well known to those of skill in the art. Immunoassays can also include competitive assays. The present invention encompasses qualitative and quantitative immunoassays.
Suitable immunoassay techniques are described, for example, in U.S. Pat. Nos. 4,016,043; 4,424,279; and 4,018,653. These include both single-site and two-site assays of the non-competitive types, as well as the traditional competitive binding assays. These assays also include direct binding of a labeled antigen-binding molecule to a target antigen.
The invention further provides methods for quantifying Akt protein expression and activation levels in cells or tissue samples obtained from an animal, such as a human cancer patient or an individual suspected of having cancer. In one embodiment, the invention provides methods for quantifying Akt protein expression or activation levels using an imaging system quantitatively. The imaging system can be used to receive, enhance, and process images of cells or tissue samples, that have been stained with AKT protein-specific stains, in order to determine the amount or activation level of AKT protein expressed in the cells or tissue samples from such an animal. In embodiments of the methods of the invention, a calibration curve of AKT1 and AKT2 protein expression can be generated for at least two cell lines expressing differing amounts of AKT protein. The calibration curve can then used to quantitatively determine the amount of AKT protein that is expressed in a cell or tissue sample. Analogous calibration curves can be made for activated AKT proteins using reagents specific for the activation features. It can also be used to determine changes in amounts and activation state of AKT before and after clinical cancer treatment.
In one particular embodiment of the methods of the invention, AKT protein expression in a cell or tissue sample can be quantified using an enzyme-linked immunoabsorbent assay (ELISA) to determine the amount of AKT protein in a sample. Such methods are described, for example, in U.S. Patent Publication No. 2002/0015974.
In other embodiments enzyme immunoassays can be used to detect the Akt kinase. In such assays, an enzyme is conjugated to the second antibody, generally by means of glutaraldehyde or periodate. The substrates to be used with the specific enzymes are generally chosen for the production of, upon hydrolysis by the corresponding enzyme, a detectable colour change. It is also possible to employ fluorogenic substrates, which yield a fluorescent product rather than the chromogenic substrates. The enzyme-labeled antibody can be added to the first antibody-antigen complex, allowed to bind, and then the excess reagent washed away A solution containing the appropriate substrate can then be added to the complex of antibody-antigen-antibody. The substrate can react with the enzyme linked to the second antibody, giving a qualitative visual signal, which may be further quantitated, usually spectrophotometrically, to give an indication of the amount of antigen which was present in the sample. Alternately, fluorescent compounds, such as fluorescein, rhodamine and the lanthanide, europium (EU), can be chemically coupled to antibodies without altering their binding capacity. When activated by illumination with light of a particular wavelength, the fluorochrome-labeled antibody adsorbs the light energy, inducing a state to excitability in the molecule, followed by emission of the light at a characteristic colour visually detectable with a light microscope. The fluorescent-labeled antibody is allowed to bind to the first antibody-antigen complex. After washing off the unbound reagent, the remaining tertiary complex is then exposed to light of an appropriate wavelength. The fluorescence observed indicates the presence of the antigen of interest. Immunofluorometric assays (IFMA) are well established in the art and are particularly useful for the present method. However, other reporter molecules, such as radioisotope, chemiluminescent or bioluminescent molecules can also be employed.
In a particular embodiment, antibodies to Akt kinase can also be used in ELISA-mediated detection of Akt kinase especially in serum or other circulatory fluid. This can be accomplished by immobilizing anti-Akt kinase antibodies to a solid support and contacting these with a biological extract such as serum, blood, lymph or other bodily fluid, cell extract or cell biopsy. Labeled anti-Akt kinase antibodies can then be used to detect immobilized Akt kinase. This assay can be varied in any number of ways and all variations are encompassed by the present invention and known to one skilled in the art. This approach can enable rapid detection and quantitation of Akt kinase levels using, for example, a serum-based assay.
In one embodiment, an Akt ELISA assay kit may be used in the present invention. For example, a Cellular Activation of Signaling ELISA kit for Akt S473 from SuperArray Bioscience can be utilized in the present invention. In one embodiment, the antibody can be an anti-pan antibody that recognizes Akt S473. ELISA assay kit containing an anti-Akt antibody and additional reagents, including, but not limited to, washing buffer, antibody dilution buffer, blocking buffer, cell staining solution, developing solution, stop solution, secondary antibodies, and distilled water.
Nucleotide Detection
In another embodiment, a method to detect Akt kinases is provided by detecting the level of expression in a cell of a polynucleotide encoding an Akt kinase. Expression of the polynucleotide can be determined using any suitable technique known to one skilled in the art. In one embodiment, a labeled polynucleotide encoding an Akt kinase can be utilized as a probe in a Northern blot of an RNA extract obtained from the cell. In other embodiments, a nucleic acid extract from an animal can be utilized in concert with oligonucleotide primers corresponding to sense and antisense sequences of a polynucleotide encoding the kinase, or flanking sequences thereof, in a nucleic acid amplification reaction such as RT PCR. A variety of automated solid-phase detection techniques are also available to one skilled in the art, for example, as described by Fodor et al. (Science, 1991. 251: p. 767-777) and Kazal et al. (Nature Medicine, 1996. 2: p. 753-759).
In other embodiments, methods are provided to detect Akt kinase encoding RNA transcripts. The RNA can be isolated from a cellular sample suspected of containing Akt kinase RNA, e.g. total RNA isolated from human cancer tissue. RNA can be isolated by methods known in the art, e.g. using TRIZOL reagent (GIBCO-BRL/Life Technologies, Gaithersburg, Md.). Oligo-dT, or random-sequence oligonucleotides, as well as sequence-specific oligonucleotides can be employed as a primer in a reverse transcriptase reaction to prepare first-strand cDNAs from the isolated RNA. Resultant first-strand cDNAs can then amplified with sequence-specific oligonucleotides in PCR reactions to yield an amplified product.
Polymerase chain reaction or “PCR” refers to a procedure or technique in which amounts of a preselected fragment of nucleic acid, RNA and/or DNA, are amplified as described, for example, in U.S. Pat. No. 4,683,195. Generally, sequence information from the ends of the region of interest or beyond is employed to design oligonucleotide primers. These primers will be identical or similar in sequence to opposite strands of the template to be amplified. PCR can be used to amplify specific RNA sequences and cDNA transcribed from total cellular RNA. See generally Mullis et al. (Quant Biol, 1987. 51; p. 263; Erlich, eds., PCR Technology, 1989, Stockton Press, NY). Thus, amplification of specific nucleic acid sequences by PCR relies upon oligonucleotides or “primers” having conserved nucleotide sequences wherein the conserved sequences are deduced from alignments of related gene or protein sequences, e.g. a sequence comparison of mammalian Akt kinase genes. For example, one primer is prepared which is predicted to anneal to the antisense strand and another primer prepared which is predicted to anneal to the sense strand of a cDNA molecule which encodes a Akt kinase. To detect the amplified product, the reaction mixture is typically subjected to agarose gel electrophoresis or other convenient separation technique and the relative presence of the Akt kinase specific amplified DNA detected. For example, Akt kinase amplified DNA may be detected using Southern hybridization with a specific oligonucleotide probe or comparing its electrophoretic mobility with DNA standards of known molecular weight. Isolation, purification and characterization of the amplified Akt kinase DNA can be accomplished by excising or eluting the fragment from the gel (for example, see references Lawn et al., Nucleic Acids Res, 1981. 2: p. 6103; Goeddel et al., Nucleic Acids Res, 1980. 8: p. 4057), cloning the amplified product into a cloning site of a suitable vector, such as the pCRII vector (Invitrogen), sequencing the cloned insert and comparing the DNA sequence to the known sequence of LIM kinase. The relative amounts of LIM kinase mRNA and cDNA can then be determined.
In one embodiment, real-time PCR can be used to determine transcriptional levels of Akt nucleotides. Determination of transcriptional activity also includes a measure of potential translational activity based on available mRNA transcripts. Real-time PCR as well as other PCR procedures use a number of chemistries for detection of PCR product including the binding of DNA binding fluorophores, the 5* endonuclease, adjacent liner and hairpin oligoprobes and the self-fluorescing amplicons. These chemistries and real-time PCR in general are discussed, for example, in Mackay et al., Nucleic Acids Res, 2002. 30(6); p. 1292-1305; Walker, J Biochem Mol Toxicology, 2001. 15(3): p. 121-127; Lewis et al., J Pathol, 2001. 195: p. 66-71.
In an alternate embodiment, the aberrant expression of Akt can be identified by contacting a nucleotide sequences isolated from a biological sample with an oligonucleotide probe having a sequence complementary to an Akt sequences selected from the nucleotide sequences of FIGS. 6 a-c, 7 a-d, or 8 a-c, or fragment thereof, and then detecting the sequence by hybridizing the probe to the sequence, and comparing the results to a normal sample. The hybridization of the probe to the biological sample can be detected by labeling the probe using any detectable agent. The probe can be labeled for example, with a radioisotope, or with biotin, fluorescent dye, electron-dense reagent, enzyme, hapten or protein for which antibodies are available. The detectable label can be assayed by any desired means, including spectroscopic, photochemical, biochemical, immunochemical, radioisotopic, or chemical means. The probe can also be detected using techniques such as an oligomer restriction technique, a dot blot assay, a reverse dot blot assay, a line probe assay, and a 5′ nuclease assay. Alternatively, the probe can be detected using any of the generally applicable DNA array technologies, including macroarray, microarray and DNA microchip technologies. The oligonucleotide probe typically includes approximately at least 14, 15, 16, 18, 20, or 28 nucleotides that hybridize to the nucleotides selected from FIGS. 6 a-c, 7 a-d, and 8 a-c, or a fragment thereof. It is generally not preferred to use a probe that is greater than approximately 25 or 28 nucleotides in length. The oligonucleotide probe is designed to identify an Akt nucleotide sequence.
Kinase Assays
The activity of the Akt kinases can be measured using any suitable kinase assay known in the art. For example, and not by way of limitation, the methods described in Hogg et al (Oncogene, 1994. 9; p. 98-96), Mills et al (J Biol Chem, 1992. 267: p. 16000-006) and Tomizawa et al. (FEBS Lett, 2001. 492: p. 221-7), Schmandt et al. (J Immunol, 1994. 152: p. 96-105) can be used. Further serine, threonine and tyrosine kinase assays are described in Ausubel et al. (Short Protocols in Molecular Biology, 1999, unit 17.6).
Akt kinase assays can generally use an Akt polypeptide, a labeled donor substrate, and a receptor substrate that is either specific or non-specific for Akt. In such assays Akt transfers a labeled moiety from the donor substrate to the receptor substrate, and kinase activity is measured by the amount of labeled moiety transferred from the donor substrate to the receptor substrate. Akt polypeptide can be produced using various expression systems, can be purified from cells, can be in the form of a cleaved or uncleaved recombinant fusion protein and/or can have non-Akt polypeptide sequences, for example a His tag or .beta.-galactosidase at its N- or C-terminus. Akt activity can be assayed in cancerous cells lines if the cancerous cell lines are used as a source of the Akt to be assayed. Suitable donor substrates for Akt assays include any molecule that is susceptible to dephosphorylation by Akt., such as, for example include .gamma.-labeled ATP and ATP analogs, wherein the label is ³³P, ³²P, ³⁵S or any other radioactive isotope or a suitable fluorescent marker. Suitable recipient substrates for Akt assays include any polypeptide or other molecule that is susceptible to phosphorylation by Akt. Recipient substrates can be derived from fragments of in vivo targets of Akt. Recipient substrates fragments can be 8 to 50 amino acids in length, usually 10 to 30 amino acids and particularly of about 10, 12, 15, 18, 20 and 25 amino acids in length. Further recipient substrates can be determined empirically using a set of different polypeptides or other molecules. Targets of Recipient substrates for TTK can be capable of being purified from other components of the reaction once the reaction has been performed. This purification is usually done through a molecular interaction, where the recipient substrates is biotinylated and purified through its interaction with streptavidin, or a specific antibody is available that can specifically recognize the recipient substrates. The reaction can be performed in a variety of conditions, such as on a solid support, in a gel, in solution or in living cells. The choice of detection methods depends on type of label used for the donor molecule and may include, for example, measurement of incorporated radiation or fluorescence by autoradiography, scintillation, scanning or fluorography.

6. METHODS OF TREATMENT

The compounds and pharmaceutical compositions provided herein can be used in the treatment of a condition including tumors, cancer, and other disorders associated with abnormal cell proliferation. In one embodiment, the compounds of the present invention can be used to treat a carcinoma, sarcoma, lymphoma, leukemia, and/or myeloma. In other embodiments of the present invention, the compounds disclosed herein can be used to treat solid tumors.
The compounds of the present invention can be used for the treatment of cancer, such as, but not limited to cancer of the following organs or tissues: breast, prostate, lung, bronchus, colon, urinary, bladder, non-Hodgkin lymphoma, melanoma, kidney, renal, pancreas, pharynx, thyroid, stomach, brain, multiple myeloma, esophagus, liver, intrahepatic bile duct, cervix, larynx, acute myeloid leukemia, chronic lymphatic leukemia, soft tissue, such as heart, Hodgkin lymphoma, testis, small intestine, chronic myeloid leukemia, acute lymphatic leukemia, anus, anal canal, anorectal, thyroid, vulva, gallbladder, pleura, eye, nose nasal cavity, middle ear, nasopharnx, ureter, peritoneum, omentum, mesentery, and gastrointestinal, high grade glioma, glioblastoma, colon, rectal, pancreatic, gastric cancers, hepatocellular carcinoma; head and neck cancers, carcinomas; renal cell carcinoma; adenocarcinoma; sarcomas; hemangioendothelioma; lymphomas; leukemias, mycosis fungoides. In additional embodiments, the compounds of the present invention can be used to treat skin diseases including, but not limited to, the malignant diseases angiosarcoma, hemangioendothelioma, basal cell carcinoma, squamous cell carcinoma, malignant melanoma and Kaposi's sarcoma, and the non-malignant diseases or conditions such as psoriasis, lymphangiogenesis, hemangioma of childhood, Sturge-Weber syndrome, verruca vulgaris, neurofibromatosis, tuberous sclerosis, pyogenic granulomas, recessive dystrophic epidermolysis bullosa, venous ulcers, acne, rosacea, eczema, molluscum contagious, seborrheic keratosis, and actinic keratosis.
Compositions including the compounds of the invention can be used to treat these cancers and other cancers at any stage from the discovery of the cancer to advanced stages. In addition, compositions including compounds of the invention can be used in the treatment of the primary cancer and metastases thereof.
In other embodiments of the invention, the compounds described herein can be used for the treatment of cancer, including, but not limited to the cancers listed in Table 2 below.

TABLE 2

Types of Cancer

	Acute Lymphoblastic Leukemia,		Hairy Cell Leukemia
	Adult		Head and Neck Cancer
	Acute Lymphoblastic Leukemia,		Hepatocellular (Liver) Cancer, Adult
	Childhood		(Primary)
	Acute Myeloid Leukemia, Adult		Hepatocellular (Liver) Cancer, Childhood
	Acute Myeloid Leukemia,		(Primary)
	Childhood		Hodgkin's Lymphoma, Adult
	Adrenocortical Carcinoma		Hodgkin's Lymphoma, Childhood
	Adrenocortical Carcinoma,		Hodgkin's Lymphoma During Pregnancy
	Childhood		Hypopharyngeal Cancer
	AIDS-Related Cancers		Hypothalamic and Visual Pathway
	AIDS-Related Lymphoma		Glioma, Childhood
	Anal Cancer		Intraocular Melanoma
	Astrocytoma, Childhood Cerebellar		Islet Cell Carcinoma (Endocrine Pancreas)
	Astrocytoma, Childhood Cerebral		Kaposi's Sarcoma
	Basal Cell Carcinoma		Kidney (Renal Cell) Cancer
	Bile Duct Cancer, Extrahepatic		Kidney Cancer, Childhood
	Bladder Cancer		Laryngeal Cancer
	Bladder Cancer, Childhood		Laryngeal Cancer, Childhood
	Bone Cancer,		Leukemia, Acute Lymphoblastic, Adult
	Osteosarcoma/Malignant Fibrous		Leukemia, Acute Lymphoblastic,
	Histiocytoma		Childhood
	Brain Stem Glioma, Childhood		Leukemia, Acute Myeloid, Adult
	Brain Tumor, Adult		Leukemia, Acute Myeloid, Childhood
	Brain Tumor, Brain Stem Glioma,		Leukemia, Chronic Lymphocytic
	Childhood		Leukemia, Chronic Myelogenous
	Brain Tumor, Cerebellar		Leukemia, B Cell
	Astrocytoma, Childhood		Lip and Oral Cavity Cancer
	Brain Tumor, Cerebral		Liver Cancer, Adult (Primary)
	Astrocytoma/Malignant Glioma,		Liver Cancer, Childhood (Primary)
	Childhood		Lung Cancer, Non-Small Cell
	Brain Tumor, Ependymoma,		Lung Cancer, Small Cell
	Childhood		Lymphoma, AIDS-Related
	Brain Tumor, Medulloblastoma,		Lymphoma, Burkitt's
	Childhood		Lymphoma, Cutaneous T-Cell, see
	Brain Tumor, Supratentorial		Mycosis Fungoides and Sézary Syndrome
	Primitive Neuroectodermal		Lymphoma, Hodgkin's, Adult
	Tumors, Childhood		Lymphoma, Hodgkin's, Childhood
	Brain Tumor, Visual Pathway and		Lymphoma, Hodgkin's During Pregnancy
	Hypothalamic Glioma, Childhood		Lymphoma, Non-Hodgkin's, Adult
	Brain Tumor, Childhood		Lymphoma, Non-Hodgkin's, Childhood
	Breast Cancer		Lymphoma, Non-Hodgkin's During
	Breast Cancer, Childhood		Pregnancy
	Breast Cancer, Male		Lymphoma, Primary Central Nervous
	Bronchial Adenomas/Carcinoids,		System
	Childhood		Macroglobulinemia, Waldenström's
	Burkitt's Lymphoma		Malignant Fibrous Histiocytoma of
	Carcinoid Tumor, Childhood		Bone/Osteosarcoma
	Carcinoid Tumor, Gastrointestinal		Medulloblastoma, Childhood
	Carcinoma of Unknown Primary		Melanoma
	Central Nervous System		Melanoma, Intraocular (Eye)
	Lymphoma, Primary		Merkel Cell Carcinoma
	Cerebellar Astrocytoma, Childhood		Mesothelioma, Adult Malignant
	Cerebral Astrocytoma/Malignant		Mesothelioma, Childhood
	Glioma, Childhood		Metastatic Squamous Neck Cancer with
	Cervical Cancer		Occult Primary
	Childhood Cancers		Multiple Endocrine Neoplasia Syndrome,
	Chronic Lymphocytic Leukemia		Childhood
	Chronic Myelogenous Leukemia		Multiple Myeloma/Plasma Cell Neoplasm
	Chronic Myeloproliferative		Mycosis Fungoides
	Disorders		Myelodysplastic Syndromes
	Colon Cancer		Myelodysplastic/Myeloproliferative
	Colorectal Cancer, Childhood		Diseases
	Cutaneous T-Cell Lymphoma, see		Myelogenous Leukemia, Chronic
	Mycosis Fungoides and Sézary		Myeloid Leukemia, Adult Acute
	Syndrome		Myeloid Leukemia, Childhood Acute
	Endometrial Cancer		Myeloma, Multiple
	Ependymoma, Childhood		Myeloproliferative Disorders, Chronic
	Esophageal Cancer		Nasal Cavity and Paranasal Sinus Cancer
	Esophageal Cancer, Childhood		Nasopharyngeal Cancer
	Ewing's Family of Tumors		Nasopharyngeal Cancer, Childhood
	Extracranial Germ Cell Tumor,		Neuroblastoma
	Childhood		Non-Hodgkin's Lymphoma, Adult
	Extragonadal Germ Cell Tumor		Non-Hodgkin's Lymphoma, Childhood
	Extrahepatic Bile Duct Cancer		Non-Hodgkin's Lymphoma During
	Eye Cancer, Intraocular Melanoma		Pregnancy
	Eye Cancer, Retinoblastoma		Non-Small Cell Lung Cancer
	Gallbladder Cancer		Oral Cancer, Childhood
	Gastric (Stomach) Cancer		Oral Cavity Cancer, Lip and
	Gastric (Stomach) Cancer,		Oropharyngeal Cancer
	Childhood		Osteosarcoma/Malignant Fibrous
	Gastrointestinal Carcinoid Tumor		Histiocytoma of Bone
	Germ Cell Tumor, Extracranial,		Ovarian Cancer, Childhood
	Childhood		Ovarian Epithelial Cancer
	Germ Cell Tumor, Extragonadal		Ovarian Germ Cell Tumor
	Germ Cell Tumor, Ovarian		Ovarian Low Malignant Potential Tumor
	Gestational Trophoblastic Tumor		Pancreatic Cancer
	Glioma, Adult		Pancreatic Cancer, Childhood
	Glioma, Childhood Brain Stem		Pancreatic Cancer, Islet Cell
	Glioma, Childhood Cerebral		Paranasal Sinus and Nasal Cavity Cancer
	Astrocytoma		Parathyroid Cancer
	Glioma, Childhood Visual Pathway		Penile Cancer
	and Hypothalamic		Pheochromocytoma
	Skin Cancer (Melanoma)		Pineoblastoma and Supratentorial
	Skin Carcinoma, Merkel Cell		Primitive Neuroectodermal Tumors,
	Small Cell Lung Cancer		Childhood
	Small Intestine Cancer		Pituitary Tumor
	Soft Tissue Sarcoma, Adult		Plasma Cell Neoplasm/Multiple Myeloma
	Soft Tissue Sarcoma, Childhood		Pleuropulmonary Blastoma
	Squamous Cell Carcinoma, see		Pregnancy and Breast Cancer
	Skin Cancer (non-Melanoma)		Pregnancy and Hodgkin's Lymphoma
	Squamous Neck Cancer with		Pregnancy and Non-Hodgkin's Lymphoma
	Occult Primary, Metastatic		Primary Central Nervous System
	Stomach (Gastric) Cancer		Lymphoma
	Stomach (Gastric) Cancer,		Prostate Cancer
	Childhood		Rectal Cancer
	Supratentorial Primitive		Renal Cell (Kidney) Cancer
	Neuroectodermal Tumors,		Renal Cell (Kidney) Cancer, Childhood
	Childhood		Renal Pelvis and Ureter, Transitional Cell
	T-Cell Lymphoma, Cutaneous, see		Cancer
	Mycosis Fungoides and Sézary		Retinoblastoma
	Syndrome		Rhabdomyosarcoma, Childhood
	Testicular Cancer		Salivary Gland Cancer
	Thymoma, Childhood		Salivary Gland Cancer, Childhood
	Thymoma and Thymic Carcinoma		Sarcoma, Ewing's Family of Tumors
	Thyroid Cancer		Sarcoma, Kaposi's
	Thyroid Cancer, Childhood		Sarcoma, Soft Tissue, Adult
	Transitional Cell Cancer of the		Sarcoma, Soft Tissue, Childhood
	Renal Pelvis and Ureter		Sarcoma, Uterine
	Trophoblastic Tumor, Gestational		Sezary Syndrome
	Unknown Primary Site, Carcinoma		Skin Cancer (non-Melanoma)
	of, Adult		Skin Cancer, Childhood
	Unknown Primary Site, Cancer of,
	Childhood
	Unusual Cancers of Childhood
	Ureter and Renal Pelvis,
	Transitional Cell Cancer
	Urethral Cancer
	Uterine Cancer, Endometrial
	Uterine Sarcoma
	Vaginal Cancer
	Visual Pathway and Hypothalamic
	Glioma, Childhood
	Vulvar Cancer
	Waldenström's Macroglobulinemia
	Wilms' Tumor

In further embodiments of the present invention, the compounds disclosed herein can be used in the treatment of angiogenesis-related diseases.
Antiangiogenic small molecules include thalidomide, which acts in part by inhibiting NFkB, 2-methoxyestradiol, which influences microtubule activation and hypoxia inducing factor (HIF1a) activation, cyclo-oxygenase 2 (COX2) inhibitors, and low doses of conventional chemotherapeutic agents, including cyclophosphamide, taxanes, and vinca alkaloids (vincristine, vinblastine) (D'Amato R. J. et al., Proc. Natl. Acad. Sci. U.S.A., 1994. 91: p. 3964-3968; D'Amato R. J. et al., Proc. Natl. Acad. Sci. U.S.A., 1994. 91: p. 4082-4085). In addition, certain tyrosine kinase inhibitors indirectly decrease angiogenesis by decreasing production of VEGF and other proangiogenic factors by tumor and stromal cells. These drugs include Herceptin, imatinib (Glivec), and Iressa (Bergers G et al., J Clin Invest, 2003. 111: p. 1287-1295; Ciardiello F. et al., Clin Cancer Res, 2001. 7: p. 1459-1465; Plum S. M. et al., Clin Cancer Res, 2003. 9: p. 4619-4626).
Recently, angiogenesis inhibitors have moved from animal models to human patients. Angiogenesis inhibitors represent a promising treatment for a variety of cancers. Recently, Avastin a high affinity antibody against vascular endothelial growth factor (VEGF), has been shown to prolong life as a single agent in advanced renal cell carcinoma and prolong life in combination with chemotherapy in advanced colon cancer (Yang J. C. et al., New Eng J Med, 2003. 349: p. 427-434; Kabbinavar F. et al., J Clin One, 2003. 21: p. 60-65).
Angiogenesis-related diseases include, but are not limited to, inflammatory, autoimmune, and infectious diseases; angiogenesis-dependent cancer, including, for example, solid tumors, blood born tumors such as leukemias, and tumor metastases; benign tumors, for example hemangiomas, acoustic neuromas, neurofibromas, trachomas, and pyogenic granulomas; rheumatoid arthritis; psoriasis; eczema; ocular angiogenic diseases, for example, diabetic retinopathy, retinopathy of prematurity, macular degeneration, corneal graft rejection, neovascular glaucoma, retrolental fibroplasia, rubeosis; Osier-Webber Syndrome; myocardial angiogenesis; plaque neovascularization; telangiectasia; hemophiliac joints; angiofibroma; and wound granulation. In addition, compositions of this invention can be used to treat diseases such as, but not limited to, intestinal adhesions, atherosclerosis, scleroderma, warts, and hypertrophic scars (i.e., keloids). Compositions of this invention can also be used in the treatment of diseases that have angiogenesis as a pathologic consequence such as cat scratch disease (Rochele minalia quintosa), ulcers (Helicobacter pylori), tuberculosis, and leprosy.

6.1. Treatment of Drug Resistant Tumors or Cancers

The invention provides compounds that can be used to treat drug resistant cancer, including the embodiments of cancers and the triciribine compound and/or the a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof.
Multidrug resistance (MDR) occurs in human cancers and can be a significant obstacle to the success of chemotherapy. Multidrug resistance is a phenomenon whereby tumor cells in vitro that have been exposed to one cytotoxic agent develop cross-resistance to a range of structurally and functionally unrelated compounds. In addition, MDR can occur intrinsically in some cancers without previous exposure to chemotherapy agents. Thus, in one embodiment, the present invention provides methods for the treatment of a patient with a drug resistant cancer, for example, multidrug resistant cancer, by administration of TCN, TCN-P or a related compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof. In certain embodiments, TCN, TCN-P and related compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be used to treat cancers that are resistant to taxol alone, rapamycin, tamoxifen, cisplatin, and/or gefitinib (iressa).
In one embodiment, TCN, TCN-P or a related compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be used for the treatment of drug resistant cancers of the colon, bone, kidney, adrenal, pancreas, liver and/or any other cancer known in the art or described herein.

6.2. Combination Therapy

In one embodiment, the triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be administered together with other cytotoxic agents. In another embodiment, the triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, and compositions thereof, when used in the treatment of solid tumors, can be administered the use of radiation.
In another embodiment of the present invention, the triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, and compositions disclosed herein can be combined with at least one additional chemotherapeutic agent. The additional agents can be administered in combination or alternation with the compounds disclosed herein. The drugs can form part of the same composition, or be provided as a separate composition for administration at the same time or a different time.
In one embodiment, the triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, disclosed herein can be combined with antiangiogenic agents to enhance their effectiveness, or combined with other antiangiogenic agents and administered together with other cytotoxic agents. In another embodiment, the triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, and compositions, when used in the treatment of solid tumors, can be administered with the agents selected from, but not limited to IL-12, retinoids, interferons, angiostatin, endostatin, thalidomide, thrombospondin-1, thrombospondin-2, captopryl, anti-neoplastic agents such as alpha interferon, COMP (cyclophosphamide, vincristine, methotrexate and prednisone), etoposide, mBACOD (methotrexate, bleomycin, doxorubicin, cyclophosphamide, vincristine and dexamethasone), PRO-MACE/MOPP (prednisone, methotrexate (w/leucovin rescue), doxorubicin, cyclophosphamide, etoposide/mechlorethamine, vincristine, prednisone and procarbazine), vincristine, vinblastine, angioinhibins, TNP-470, pentosan polysulfate, platelet factor 4, angiostatin, LM-609, SU-101, CM-101, Techgalan, thalidomide, SP-PG and radiation. In further embodiments, the compounds and compositions disclosed herein can be administered in combination or alternation with, for example, drugs with antimitotic effects, such as those which target cytoskeletal elements, including podophylotoxins or vinca alkaloids (vincristine, vinblastine); antimetabolite drugs (such as 5-fluorouracil, cytarabine, gemcitabine, purine analogues such as pentostatin, methotrexate); alkylating agents or nitrogen mustards (such as nitrosoureas, cyclophosphamide or ifosphamide); drugs which target DNA such as the antracycline drugs adriamycin, doxorubicin, pharmorubicin or epirubicin; drugs which target topoisomerases such as etoposide; hormones and hormone agonists or antagonists such as estrogens, antiestrogens (tamoxifen and related compounds) and androgens, flutamide, leuprorelin, goserelin, cyprotrone or octreotide; drugs which target signal transduction in tumour cells including antibody derivatives such as herceptin; alkylating drugs such as platinum drugs (cis-platin, carbonplatin, oxaliplatin, paraplatin) or nitrosoureas; drugs potentially affecting metastasis of tumours such as matrix metalloproteinase inhibitors; gene therapy and antisense agents; antibody therapeutics; other bioactive compounds of marine origin, notably the didemnins such as aplidine; steroid analogues, in particular dexamethasone; anti-inflammatory drugs, including nonsteroidal agents (such as acetaminophen or ibuprofen) or steroids and their derivatives in particular dexamethasone; anti-emetic drugs, including 5HT-3 inhibitors (such as gramisetron or ondasetron), and steroids and their derivatives in particular dexamethasone. In still further embodiments, the compounds and compositions can be used in combination or alternation with the chemotherapeutic agents disclosed below in Table 3.

TABLE 3

Chemotherapeutic Agents

13-cis-Retinoic Acid	Neosar
2-Amino-6-	Neulasta
Mercaptopurine	Neumega
2-CdA	Neupogen
2-Chlorodeoxyadenosine	Nilandron
5-fluorouracil	Nilutamide
5-FU	Nitrogen Mustard
6-TG	Novaldex
6-Thioguanine	Novantrone
6-Mercaptopurine	Octreotide
6-MP	Octreotide acetate
Accutane	Oncospar
Actinomycin-D	Oncovin
Adriamycin	Ontak
Adrucil	Onxal
Agrylin	Oprevelkin
Ala-Cort	Orapred
Aldesleukin	Orasone
Alemtuzumab	Oxaliplatin
Alitretinoin	Paclitaxel
Alkaban-AQ	Pamidronate
Alkeran	Panretin
All-transretinoic acid	Paraplatin
Alpha interferon	Pediapred
Altretamine	PEG Interferon
Amethopterin	Pegaspargase
Amifostine	Pegfilgrastim
Aminoglutethimide	PEG-INTRON
Anagrelide	PEG-L-asparaginase
Anandron	Phenylalanine Mustard
Anastrozole	Platinol
Arabinosylcytosine	Platinol-AQ
Ara-C	Prednisolone
Aranesp	Prednisone
Aredia	Prelone
Arimidex	Procarbazine
Aromasin	PROCRIT
Arsenic trioxide	Proleukin
Asparaginase	Prolifeprospan 20 with Carmustine implant
ATRA	Purinethol
Avastin	Raloxifene
BCG	Rheumatrex
BCNU	Rituxan
Bevacizumab	Rituximab
Bexarotene	Roveron-A (interferon alfa-2a)
Bicalutamide	Rubex
BiCNU	Rubidomycin hydrochloride
Blenoxane	Sandostatin
Bleomycin	Sandostatin LAR
Bortezomib	Sargramostim
Busulfan	Solu-Cortef
Busulfex	Solu-Medrol
C225	STI-571
Calcium Leucovorin	Streptozocin
Campath	Tamoxifen
Camptosar	Targretin
Camptothecin-11	Taxol
Capecitabine	Taxotere
Carac	Temodar
Carboplatin	Temozolomide
Carmustine	Teniposide
Carmustine wafer	TESPA
Casodex	Thalidomide
CCNU	Thalomid
CDDP	TheraCys
CeeNU	Thioguanine
Cerubidine	Thioguanine Tabloid
cetuximab	Thiophosphoamide
Chlorambucil	Thioplex
Cisplatin	Thiotepa
Citrovorum Factor	TICE
Cladribine	Toposar
Cortisone	Topotecan
Cosmegen	Toremifene
CPT-11	Trastuzumab
Cyclophosphamide	Tretinoin
Cytadren	Trexall
Cytarabine	Trisenox
Cytarabine liposomal	TSPA
Cytosar-U	VCR
Cytoxan	Velban
Dacarbazine	Velcade
Dactinomycin	VePesid
Darbepoetin alfa	Vesanoid
Daunomycin	Viadur
Daunorubicin	Vinblastine
Daunorubicin	Vinblastine Sulfate
hydrochloride	Vincasar Pfs
Daunorubicin liposomal	Vincristine
DaunoXome	Vinorelbine
Decadron	Vinorelbine tartrate
Delta-Cortef	VLB
Deltasone	VP-16
Denileukin diftitox	Vumon
DepoCyt	Xeloda
Dexamethasone	Zanosar
Dexamethasone acetate	Zevalin
dexamethasone sodium	Zinecard
phosphate	Zoladex
Dexasone	Zoledronic acid
Dexrazoxane	Zometa
DHAD	Gliadel wafer
DIC	Glivec
Diodex	GM-CSF
Docetaxel	Goserelin
Doxil	granulocyte-colony stimulating factor
Doxorubicin	Granulocyte macrophage colony stimulating
Doxorubicin liposomal	factor
Droxia	Halotestin
DTIC	Herceptin
DTIC-Dome	Hexadrol
Duralone	Hexalen
Efudex	Hexamethylmelamine
Eligard	HMM
Ellence	Hycamtin
Eloxatin	Hydrea
Elspar	Hydrocort Acetate
Emcyt	Hydrocortisone
Epirubicin	Hydrocortisone sodium phosphate
Epoetin alfa	Hydrocortisone sodium succinate
Erbitux	Hydrocortone phosphate
Erwinia L-asparaginase	Hydroxyurea
Estramustine	Ibritumomab
Ethyol	Ibritumomab Tiuxetan
Etopophos	Idamycin
Etoposide	Idarubicin
Etoposide phosphate	Ifex
Eulexin	IFN-alpha
Evista	Ifosfamide
Exemestane	IL-2
Fareston	IL-11
Faslodex	Imatinib mesylate
Femara	Imidazole Carboxamide
Filgrastim	Interferon alfa
Floxuridine	Interferon Alfa-2b (PEG conjugate)
Fludara	Interleukin-2
Fludarabine	Interleukin-11
Fluoroplex	Intron A (interferon alfa-2b)
Fluorouracil	Leucovorin
Fluorouracil (cream)	Leukeran
Fluoxymesterone	Leukine
Flutamide	Leuprolide
Folinic Acid	Leurocristine
FUDR	Leustatin
Fulvestrant	Liposomal Ara-C
G-CSF	Liquid Pred
Gefitinib	Lomustine
Gemcitabine	L-PAM
Gemtuzumab ozogamicin	L-Sarcolysin
Gemzar	Meticorten
Gleevec	Mitomycin
Lupron	Mitomycin-C
Lupron Depot	Mitoxantrone
Matulane	M-Prednisol
Maxidex	MTC
Mechlorethamine	MTX
Mechlorethamine	Mustargen
Hydrochlorine	Mustine
Medralone	Mutamycin
Medrol	Myleran
Megace	Iressa
Megestrol	Irinotecan
Megestrol Acetate	Isotretinoin
Melphalan	Kidrolase
Mercaptopurine	Lanacort
Mesna	L-asparaginase
Mesnex	LCR
Methotrexate
Methotrexate Sodium
Methylprednisolone
Mylocel
Letrozole

In certain embodiments, interferons (IFNs) can be used in combinations with the compounds of the present invention. Suitable interferons include: interferon alpha-2a, interferon alpha-2b, pegylated interferon alpha, including interferon alpha-2a and interferon alpha 2b, interferon beta, interferon gamma, interferon tau, interferon omega, INFERGEN (interferon alphacon-1) by InterMune, OMNIFERON (natural interferon) by Viragen, ALBUFERON by Human Genome Sciences, REBIF (interferon beta-1a) by Ares-Serono, Omega Interferon by BioMedicine, Oral Interferon Alpha by Amarillo Biosciences, and interferon gamma, interferon tau, and/or interferon gamma-1□ by InterMune.
In one embodiment TCN, TCN-P or a related compound and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, as disclosed herein can be used in combination or alternation with additional chemotherapeutic agents, such as those described herein or in Table 3, for the treatment of drug resistant cancer, for example multiple drug resistant cancer. Drug resistant cancers can include cancers of the colon, bone, kidney, adrenal, pancreas, liver and/or any other cancer known in the art or described herein. In one embodiment, the additional chemotherapeutic agent can be a P-glycoprotein inhibitor. In certain non-limiting embodiments, the P-glycoprotein inhibitor can be selected from the following drugs: verapamil, cyclosporin (such as cyclosporin A), tamoxifen, calmodulin antagonists, dexverapamil, dexniguldipine, valspodar (PSC 833), biricodar (VX-710), tariquidar (XR9576), zosuquidar (LY335979), laniquidar (R101933), and/or ONT-093.

7. PHARMACEUTICAL COMPOSITIONS

The compositions including triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can optionally be administered with a pharmaceutical carrier or excipient. Pharmaceutical carriers suitable for administration of the compounds provided herein include any such carriers known to those skilled in the art to be suitable for the particular mode of administration. The triciribine compounds and in combination with a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, may be formulated as the sole pharmaceutically active ingredients in the composition or may be combined.
Compositions including the triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, may be suitable for oral, rectal, nasal, topical (including buccal and sublingual), vaginal, or parenteral (including subcutaneous, intramuscular, subcutaneous, intravenous, intradermal, intraocular, intratracheal, intracisternal, intraperitoneal, and epidural) administration. Preferably the compositions are administered intravenously.
The compositions may conveniently be presented in unit dosage form and may be prepared by conventional pharmaceutical techniques. Such techniques include the step of bringing into association one or more compositions of the present invention and one or more pharmaceutical carriers or excipients.
The triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, and compositions thereof can be formulated into suitable pharmaceutical preparations such as solutions, suspensions, tablets, dispersible tablets, pills, capsules, powders, sustained release formulations or elixirs, for oral administration or in sterile solutions or suspensions for parenteral administration, as well as transdermal patch preparation and dry powder inhalers. In one embodiment, the triciribine compounds described above are formulated into pharmaceutical compositions using techniques and procedures well known in the art (see, e.g., Ansel, Introduction to Pharmaceutical Dosage Forms, Fourth Ed., 1985, p. 126).
In the compositions, effective concentrations of one or more compounds or pharmaceutically acceptable derivatives thereof may be mixed with one or more suitable pharmaceutical carriers. The compounds of the invention may be derivatized as the corresponding salts, esters, enol ethers or esters, acetals, ketals, orthoesters, hemiacetals, hemiketals, acids, bases, solvates, hydrates or prodrugs prior to formulation. The concentrations of the compounds in the compositions are effective for delivery of an amount, upon administration, that treats, prevents, or ameliorates one or more of the symptoms of the target disease or disorder. In one embodiment, the compositions are formulated for single dosage administration. To formulate a composition, the weight fraction of compound is dissolved, suspended, dispersed or otherwise mixed in a selected carrier at an effective concentration such that the treated condition is relieved, prevented, or one or more symptoms are ameliorated.
Compositions suitable for oral administration may be presented as discrete units such as, but not limited to, tablets, caplets, pills or dragees capsules, or cachets, each containing a predetermined amount of one or more of the compositions; as a powder or granules; as a solution or a suspension in an aqueous liquid or a non-aqueous liquid; or as an oil-in-water liquid emulsion or a water-in-oil emulsion or as a bolus, etc.
Liquid pharmaceutically administrable compositions can, for example, be prepared by dissolving, dispersing, or otherwise mixing a triciribine compound and optional pharmaceutical adjuvants in a carrier, such as, for example, water, saline, aqueous dextrose, glycerol, glycols, ethanol, and the like, to thereby form a solution or suspension. If desired, the pharmaceutical composition to be administered may also contain minor amounts of nontoxic auxiliary substances such as wetting agents, emulsifying agents, solubilizing agents, pH buffering agents, preservatives, flavoring agents, and the like, for example, acetate, sodium citrate, cyclodextrine derivatives, sorbitan monolaurate, triethanolamine sodium acetate, triethanolamine oleate, and other such agents. Methods of preparing such dosage forms are known, or will be apparent, to those skilled in this art; for example, see Remington's Pharmaceutical Sciences, Mack Publishing Company, Easton, Pa.
Compositions of the present invention suitable for topical administration in the mouth include for example, lozenges, having the ingredients in a flavored basis, usually sucrose and acacia or tragacanth; pastilles, having one or more triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, of the present invention in an inert basis such as gelatin and glycerin, or sucrose and acacia; and mouthwashes, having one or more of the compositions of the present invention administered in a suitable liquid carrier
The tablets, pills, capsules, troches and the like can contain one or more of the following ingredients, or compounds of a similar nature: a binder; a lubricant; a diluent; a glidant; a disintegrating agent; a coloring agent; a sweetening agent; a flavoring agent; a wetting agent; an emetic coating; and a film coating. Examples of binders include microcrystalline cellulose, gum tragacanth, glucose solution, acacia mucilage, gelatin solution, molasses, polyinylpyrrolidine, povidone, crospovidones, sucrose and starch paste. Lubricants include talc, starch, magnesium or calcium stearate, lycopodium and stearic acid. Diluents include, for example, lactose, sucrose, starch, kaolin, salt, mannitol and dicalcium phosphate. Glidants include, but are not limited to, colloidal silicon dioxide. Disintegrating agents include crosscarmellose sodium, sodium starch glycolate, alginic acid, corn starch, potato starch, bentonite, methylcellulose, agar and carboxymethylcellulose. Coloring agents include, for example, any of the approved certified water soluble FD and C dyes, mixtures thereof; and water insoluble FD and C dyes suspended on alumina hydrate. Sweetening agents include sucrose, lactose, mannitol and artificial sweetening agents such as saccharin, and any number of spray dried flavors. Flavoring agents include natural flavors extracted from plants such as fruits and synthetic blends of compounds which produce a pleasant sensation, such as, but not limited to peppermint and methyl salicylate. Wetting agents include propylene glycol monostearate, sorbitan monooleate, diethylene glycol monolaurate and polyoxyethylene laurel ether. Emetic-coatings include fatty acids, fats, waxes, shellac, ammoniated shellac and cellulose acetate phthalates. Film coatings include hydroxyethylcellulose, sodium carboxymethylcellulose, polyethylene glycol 4000 and cellulose acetate phthalate.
Compositions suitable for topical administration to the skin may be presented as ointments, creams, gels, and pastes, having one or more of the compositions administered in a pharmaceutical acceptable carrier.
Compositions for rectal administration may be presented as a suppository with a suitable base including, for example, cocoa butter or a salicylate.
Compositions suitable for nasal administration, when the carrier is a solid, include a coarse powder having a particle size, for example, in the range of 20 to 500 microns which is administered in the manner in which snuff is taken, (i.e., by rapid inhalation through the nasal passage from a container of the powder held close up to the nose). When the earner is a liquid (for example, a nasal spray or as nasal drops), one or more of the compositions can be admixed in an aqueous or oily solution, and inhaled or sprayed into the nasal passage.
Compositions suitable for vaginal administration may be presented as pessaries, tampons, creams, gels, pastes, foams or spray formulations containing one or more of the compositions and appropriate carriers.
Compositions suitable for parenteral administration include aqueous and non-aqueous sterile injection solutions which may contain antioxidants, buffers, bacteriostats, and solutes which render the formulation isotonic with the blood of the intended recipient; and aqueous and non-aqueous sterile suspensions which may include suspending agents and thickening agents. The compositions may be presented in unit-dose or multi-dose containers, for example, sealed ampules and vials, and may be stored in a freeze-dried (lyophilized) condition requiring only the addition of the sterile liquid carrier, for example, water for injections, immediately prior to use. Extemporaneous injection solutions and suspensions may be prepared from sterile powders, granules, and tablets of the kind previously described above.
Pharmaceutical organic or inorganic solid or liquid carrier media suitable for enteral or parenteral administration can be used to fabricate the compositions. Gelatin, lactose, starch, magnesium stearate, talc, vegetable and animal fats and oils, gum, polyalkylene glycol, water, or other known carriers may all be suitable as carrier media.
Compositions including triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, may be used in combination with one or more pharmaceutically acceptable carrier mediums and/or excipients. As used herein, “pharmaceutically acceptable carrier medium” includes any and all carriers, solvents, diluents, or other liquid vehicles, dispersion or suspension aids, surface active agents, isotonic agents, thickening or emulsifying agents, preservatives, solid binders, lubricants, adjuvants, vehicles, delivery systems, disintegrants, absorbents, preservatives, surfactants, colorants, flavorants, or sweeteners and the like, as suited to the particular dosage form desired.
Additionally, the compositions including triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, may be combined with pharmaceutically acceptable excipients, and, optionally, sustained-release matrices, such as biodegradable polymers, to form therapeutic compositions. A “pharmaceutically acceptable excipient” includes a non-toxic solid, semi-solid or liquid filler, diluent, encapsulating material or formulation auxiliary of any type.
It will be understood, however, that the total daily usage of the compositions will be decided by the attending physician within the scope of sound medical judgment. The specific therapeutically effective dose level for any particular host will depend upon a variety of factors, including for example, the disorder being treated and the severity of the disorder; activity of the specific composition employed; the specific composition employed, the age, body weight, general health, sex and diet of the patient; the time of administration; route of administration; rate of excretion of the specific compound employed; the duration of the treatment; the triciribine compound and/or the a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, used in combination or coincidental with the specific composition employed; and like factors well known in the medical arts. For example, it is well within the skill of the art to start doses of the composition at levels lower than those required to achieve the desired therapeutic effect and to gradually increase the dosage until the desired effect is achieved.
Compositions including triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, are preferably formulated in dosage unit form for ease of administration and uniformity of dosage. “Dosage unit form” as used herein refers to a physically discrete unit of the composition appropriate for the host to be treated. Each dosage should contain the quantity of composition calculated to produce the desired therapeutic affect either as such, or in association with the selected pharmaceutical carrier medium.
Preferred unit dosage formulations are those containing a daily dose or unit, daily sub-dose, or an appropriate fraction thereof, of the administered ingredient. For example, approximately 1-5 mg per day of a compound disclosed herein can reduce the volume of a solid tumor in mice.
The dosage will depend on host factors such as weight, age, surface area, metabolism, tissue distribution, absorption rate and excretion rate. In one embodiment, approximately 0.5 to 7 grams per day of a triciribine compound disclosed herein may be administered to humans. Optionally approximately 3 to 4 grams per day of the compound can be administered to humans. In certain embodiments 0.001-5 mg/day is administered to a human. The therapeutically effective dose level will depend on many factors as noted above. In addition, it is well within the skill of the art to start doses of the composition at relatively low levels, and increase the dosage until the desired effect is achieved.
Compositions including triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, may be used with a sustained-release matrix, which can be made of materials, usually polymers, which are degradable by enzymatic or acid-based hydrolysis or by dissolution. Once inserted into the body, the matrix is acted upon by enzymes and body fluids. A sustained-release matrix for example is chosen from biocompatible materials such as liposomes, polylactides (polylactic acid), polyglycolide (polymer of glycolic acid), polylactide co-glycolide (copolymers of lactic acid and glycolic acid), polyanhydrides, poly(ortho)esters, polypeptides, hyaluronic acid, collagen, chondroitin sulfate, carboxcylic acids, fatty acids, phospholipids, polysaccharides, nucleic acids, polyamino acids, amino acids such as phenylalanine, tyrosine, isoleucine, polynucleotides, polyvinyl propylene, polyvinylpyrrolidone and silicone. A preferred biodegradable matrix is a matrix of one of either polylactide, polyglycolide, or polylactide co-glycolide (co-polymers of lactic acid and glycolic acid).
The triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, may also be administered in the form of liposomes. As is known in the art, liposomes are generally derived from phospholipids or other lipid substances. Liposomes are formed by mono- or multi-lamellar hydrated liquid crystals that are dispersed in an aqueous medium. Any non-toxic, physiologically-acceptable and metabolizable lipid capable of forming liposomes can be used. The liposome can contain, in addition to one or more compositions of the present invention, stabilizers, preservatives, excipients, and the like. Examples of lipids are the phospholipids and the phosphatidyl cholines (lecithins), both natural and synthetic. Methods to form liposomes are known in the art.
The triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, may be formulated as aerosols for application, such as by inhalation. These formulations for administration to the respiratory tract can be in the form of an aerosol or solution for a nebulizer, or as a microfine powder for insufflation, alone or in combination with an inert carrier such as lactose. In such a case, the particles of the formulation will, in one embodiment, have diameters of less than 50 microns, in one embodiment less than 10 microns.
Compositions including the triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, may be used in combination with other compositions and/or procedures for the treatment of the conditions described above. For example, a tumor may be treated conventionally with surgery, radiation, or chemotherapy combined with one or more compositions of the present invention and then one or more compositions of the present invention may be subsequently administered to the patient to extend the dormancy of micrometastases and to stabilize, inhibit, or reduce the growth of any residual primary tumor.

7.1. Additional Embodiments

The pharmaceutical compositions including triciribine compounds and a molecule that modulates the HER2 neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be formulated according to known methods for preparing pharmaceutically useful compositions. Formulations are described in a number of sources which are well known and readily available to those skilled in the art. For example, Remington's Pharmaceutical Sciences, Mack Publishing Company, Easton, Pa. describes formulations which can be used in connection with the subject invention. Formulations suitable for administration include, for example, aqueous sterile injection solutions, which may contain antioxidants, buffers, bacteriostats, and solutes which render the formulation isotonic with the blood of the intended recipient; and aqueous and nonaqueous sterile suspensions which may include suspending agents and thickening agents. The formulations may be presented in unit-dose or multi-dose containers, for example sealed ampoules and vials, and may be stored in a freeze dried (lyophilized) condition requiring only the condition of the sterile liquid carrier, for example, water for injections, prior to use. Extemporaneous injection solutions and suspensions may be prepared from sterile powder, granules, tablets, etc. It should be understood that in addition to the ingredients particularly mentioned above, the formulations of the subject invention can include other agents conventional in the art having regard to the type of formulation in question.
The methods of the present invention, for example, for inhibiting the growth of a cancerous cell, can be advantageously combined with at least one additional therapeutic method, including but not limited to chemotherapy, radiation therapy, therapy that selectively inhibits Ras oncogenic signaling, or any other therapy known to those of skill in the art of the treatment and management of cancer, such as administration of an anti-cancer agent.
Administration of API-2 (triciribine) as a salt may be carried out. Examples of pharmaceutically acceptable salts are organic acid addition salts formed with acids which form a physiological acceptable anion, for example, tosylate, methanesulfonate, acetate, citrate, malonate, tartarate, succinate, benzoate, ascorbate, alpha-ketoglutarate, and alpha-glycerophosphate. Suitable inorganic salts may also be formed, including hydrochloride, sulfate, nitrate, bicarbonate, and carbonate salts.
Pharmaceutically acceptable salts may be obtained using standard procedures well known in the art, for example by reacting a sufficiently basic compound such as an amine with a suitable acid affording a physiologically acceptable anion. Alkali metal (for example, sodium, potassium or lithium) or alkaline earth metal (for example calcium) salts of carboxylic acids can also be made.
The triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, can be formulated as pharmaceutical compositions and administered to a subject, such as a human or veterinary patient, in a variety of forms adapted to the chosen route of administration, i.e., orally or parenterally, by intravenous, intramuscular, topical or subcutaneous routes.
Thus, the triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, of the present invention may be systemically administered, e.g., orally, in combination with a pharmaceutically acceptable vehicle (i.e., carrier) such as an inert diluent or an assimilable edible carrier. They may be enclosed in hard or soft shell gelatin capsules, may be compressed into tablets, or may be incorporated directly with the food of the patient's diet. For oral therapeutic administration, the compounds may be combined with one or more excipients and used in the form of ingestible tablets, buccal tablets, troches, capsules, elixirs, suspensions, syrups, wafers, and the like. Such compositions and preparations should contain at least 0.1% of active agent. The percentage of the compositions and preparations may, of course, be varied and may conveniently be between about 2 to about 60% of the weight of a given unit dosage form. The amount of the active compound in such therapeutically useful compositions is such that an effective dosage level will be obtained.
The tablets, troches, pills, capsules, and the like may also contain the following: binders such as gum tragacanth, acacia, corn starch or gelatin; excipients such as dicalcium phosphate; a disintegrating agent such as corn starch, potato starch, alginic acid and the like; a lubricant such as magnesium stearate; and a sweetening agent such as sucrose, fructose, lactose or aspartame or a flavoring agent such as peppermint, oil of wintergreen, or cherry flavoring may be added. When the unit dosage form is a capsule, it may contain, in addition to materials of the above type, a liquid carrier, such as a vegetable oil or a polyethylene glycol. Various other materials may be present as coatings or to otherwise modify the physical form of the solid unit dosage form. For instance, tablets, pills, or capsules may be coated with gelatin, wax, shellac or sugar and the like. A syrup or elixir may contain the compounds of the invention, sucrose or fructose as a sweetening agent, methyl and propylparabens as preservatives, a dye and flavoring such as cherry or orange flavor. Of course, any material used in preparing any unit dosage form should be pharmaceutically acceptable and substantially non-toxic in the amounts employed. In addition, the compounds of the invention may be incorporated into sustained-release preparations and devices.
The triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, may also be administered intravenously or intraperitoneally by infusion or injection. Solutions of the active agents or their salts can be prepared in water, optionally mixed with a nontoxic surfactant. Dispersions can also be prepared in glycerol, liquid polyethylene glycols, triacetin, and mixtures thereof and in oils. Under ordinary conditions of storage and use, these preparations contain a preservative to prevent the growth of microorganisms.
The pharmaceutical dosage forms suitable for injection or infusion can include sterile aqueous solutions or dispersions or sterile powders including the active ingredient which are adapted for the extemporaneous preparation of sterile injectable or infusible solutions or dispersions, optionally encapsulated in liposomes. In all cases, the ultimate dosage form must be sterile, fluid and stable under the conditions of manufacture and storage. The liquid carrier or vehicle can be a solvent or liquid dispersion medium including, for example, water, ethanol, a polyol (for example, glycerol, propylene glycol, liquid polyethylene glycols, and the like), vegetable oils, nontoxic glyceryl esters, and suitable mixtures thereof. The proper fluidity can be maintained, for example, by the formation of liposomes, by the maintenance of the required particle size in the case of dispersions or by the use of surfactants. The prevention of the action of microorganisms can be brought about by various antibacterial and antifungal agents, for example, parabens, chlorobutanol, phenol, sorbic acid, thimerosal, and the like. In many cases, it will be preferable to include isotonic agents, for example, sugars, buffers or sodium chloride. Prolonged absorption of the injectable compositions can be brought about by the use in the compositions of agents delaying absorption, for example, aluminum monostearate and gelatin.
Sterile injectable solutions are prepared by incorporating compounds of the invention in the required amount in the appropriate solvent with various of the other ingredients enumerated above, as required, followed by filter sterilization, in the case of sterile powders for the preparation of sterile injectable solutions, the preferred methods of preparation are vacuum drying and the freeze drying techniques, which yield a powder of the active ingredient plus any additional desired ingredient present in the previously sterile-filtered solutions.
For topical administration, the triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, may be applied in pure-form, i.e., when they are liquids. However, it will generally be desirable to administer them to die skin as compositions or formulations, in combination with a dermatologically acceptable carrier, which may be a solid or a liquid.
Useful solid carriers include finely divided solids such as talc, clay, microcrystalline cellulose, silica, alumina and the like. Useful liquid carriers include water, alcohols or glycols or water-alcohol/glycol blends, in which the compounds of the invention can be dissolved or dispersed at effective levels, optionally with the aid of non-toxic surfactants. Adjuvants such as fragrances and additional antimicrobial agents can be added to optimize the properties for a given use. The resultant liquid compositions can be applied from absorbent pads, used to impregnate bandages and other dressings, or sprayed onto the affected area using pump-type or aerosol sprayers.
Thickeners such as synthetic polymers, fatty acids, fatty acid salts and esters, fatty alcohols, modified celluloses or modified mineral materials can also be employed with liquid carriers to form spreadable pastes, gels, ointments, soaps, and the like, for application directly to the skin of the user. Examples of useful dermatological compositions which can be used to deliver the compounds of the invention to the skin are disclosed in Jacquet et al. (U.S. Pat. No. 4,608,392), Geria (U.S. Pat. No. 4,992,478), Smith et al. (U.S. Pat. No. 4,559,157) and Woltzman (U.S. Pat. No. 4,820,508).
Useful dosages of the pharmaceutical compositions of the present invention can be determined by comparing their in vitro activity, and in vivo activity in animal models. Methods for the extrapolation of effective dosages in mice, and other animals, to humans are known to the art; for example, see U.S. Pat. No. 4,938,949.
In one non-limiting embodiment, the concentration of the active agent in a liquid composition, such as a lotion, can be from about 0.1-25 wt-%, or from about 0.5-10 wt.-%. In one embodiment, the concentration in a semi-solid or solid composition such as a gel or a powder can be about 0.1-5 wt.-%, preferably about 0.5-2.5 wt.-%. In one embodiment, single dosages for injection, infusion or ingestion will generally vary between 5-1500 mg, and may be administered, i.e., 1-3 times daily, to yield levels of about 0.1-50 mg/kg, for adults. A non-limiting dosage of the present invention can be between 7.5 to 45 mg per clay, administered orally, with appropriate adjustment for the body weight of an individual.
Accordingly, the present invention includes a pharmaceutical composition including triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, or pharmaceutically acceptable salts thereof, in combination with a pharmaceutically acceptable carrier. Pharmaceutical compositions adapted for oral, topical or parenteral administration, including an amount of triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab or a salt thereof, or a pharmaceutically acceptable salt thereof, constitute a preferred embodiment of the invention. The dose administered to a subject, particularly a human, in the context of the present invention should be sufficient to affect a therapeutic response in the patient over a reasonable time frame. One skilled in the art will recognize that dosage will depend upon a variety of factors including the condition of the animal, the body weight of the animal, as well as the severity and stage of the cancer.
A suitable dose is that which will result in a concentration of the triciribine compounds and a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab, in tumor tissue which is known to affect the desired response. The preferred dosage is the amount which results in maximum inhibition of cancer cell growth, without unmanageable side effects. Administration of API-2 (or a pharmaceutically acceptable salt thereof) can be continuous or at distinct intervals, as can be determined by a person of ordinary skill in the art.
Mammalian species which benefit from the disclosed methods for the inhibition of cancer cell growth, include, but are not limited to, primates, such as apes, chimpanzees, orangutans, humans, monkeys; domesticated animals (e.g., pets) such as dogs, cats, guinea pigs, hamsters, Vietnamese pot-bellied pigs, rabbits, and ferrets; domesticated farm animals such as cows, buffalo, bison, horses, donkey, swine, sheep, and goats; exotic animals typically found in zoos, such as bear, lions, tigers, panthers, elephants, hippopotamus, rhinoceros, giraffes, antelopes, sloth, gazelles, zebras, wildebeests, prairie dogs, koala bears, kangaroo, opossums, raccoons, pandas, hyena, seals, sea lions, elephant seals, otters, porpoises, dolphins, and whales. The terms “patient” and “subject” are used herein interchangeably and are intended to include such human and non-human mammalian species. Likewise, in vitro methods of the present invention can be earned out on cells of such mammalian species.
Patients in need of treatment using the methods of the present invention can be identified using standard techniques known to those in the medical profession.
The following examples are offered by way of illustration and not by way of limitation.

8. EXAMPLES

Example 1

In Vitro Screening

Cell Lines and NCI Diversity Set. All cell lines can be purchased from ATCC or described previously (Cheng J. Q. et al. Oncogene, 1997. 14: p. 2793-2801; West, K. A. et al., Drug Resist Updat, 2002. 5: p. 234-248; Satyamoorthy K. et al., Cancer Res, 2001. 61; p. 7318-7324). The NCI Structural Diversity Set is a library of 1,992 compounds selected from the approximately 140,000-compound NCI drug depository. In-depth data on the selection, structures, and activities of these diversity set compounds can be found on the NCI Developmental Therapeutics Program web site.
Screening for Inhibition of Akt-transformed Cell Growth, AKT2 transformed NIH3T3 cells or LXSN vector-transfected NIH3T3 control cells (Cheng J. Q. et al., Oncogene, 1997. 14: p. 2793-2803) are plated into 96-well tissue culture plate. Following treatment with 5 μM of NCI Diversity Set compound, cell growth can be detected with CellTier 96 One Solution Cell Proliferation kit (Promega). Compounds that inhibit growth in AKT2-transformed but not LXSN-transfected NIH3T3 cells are considered as candidates of Akt inhibitor and subjected to further analysis.
In vitro Protein Kinase, Cell Survival and Apoptosis Assays. In vitro kinase is performed as previously described (see, for example, Jiang K. et al., Mol Cell Biol, 2000. 20: p. 139-148). Cell survival is assayed with MTS (Promega). Apoptosis was detected with annexin V, which is performed as previously described (Jiang K. et al., Mol Cell Biol, 2000. 20: p. 139-148). Recombinant Akt and PDK1 are purchased from Upstate Biotechnology Inc.
Results
Identification of Small Molecule Inhibitor of Akt Signaling Pathway, API-2.
Frequent alterations of Akt has been detected in human cancer and disruption of Akt pathway induces apoptosis and inhibits tumor growth (Jetzt A, et al., Cancer Res, 2003. 63: p. 697-706, 2003). Thus, Akt is considered as an attractive molecular target for development of novel cancer therapeutics. To identify small molecule inhibitor(s) of Akt, a chemical library of 1,992-compounds from the NCI (the NCI Diversity Set) is evaluated for agents capable of inhibition of growth in AKT2-transformed but not empty vector LXSN-transfected NIH3T3 cells. Repeated experiments showed that 32 compounds inhibited growth only in AKT2-transformed cells. The most potent of these compounds, API-2 (NCI identifier: NSC 154020), can suppress cell growth at a concentration of 50 nM. FIG. 1A shows the chemical structure of API-2, which is also known as triciribine (Schweinsberg P. D. et al., Biochem Pharmacol, 1981. 30: p. 2521-2526). The fact that API-2 inhibits selectively AKT-2 transformed cells over untransformed parental cells prompted us to determine whether API-2 is an inhibitor of AKT2 kinase. To this end, AKT2 is immunoprecipitated with anti-AKT2 antibody from AKT-2 transformed NIH3T3 cells following treatment with API-2. AKT2 immunoprecipitates were immunoblotted with anti-phospho-Akt antibodies. As shown in FIG. 1B, API-2 significantly inhibited AKT2 phosphorylation at both threonine-309 and serine-474, which are required for full activation of AKT2 (Datta S. R. et al. Genes Dev, 1999. 13: p. 2905-2927). As three isoforms of Akt share high homology and similar structure, the effect of API-2 on their kinase activities is evaluated. HEK293 cells are transfected with HA-Akt1, -AKT2 and -AKT3, serum-starved overnight and treated with API-2 for 60 min prior to EGF (50 ng/ml) stimulation. Triple experiments showed that API-2 suppressed EGF-induced kinase activity and phosphorylation of Akt1, AKT2 and AKT3 (FIG. 1C). However, kinase activity of recombinant constitutively active AKT2 (Myr-AKT2) is not inhibited by API-2 in an in vitro kinase reaction (FIG. 1D), suggesting that API-2 does not directly inhibit Akt in vitro and that API-2 neither functions as ATP competitor nor as the substrate competitor that binds to active site of Akt.
API-2 Does Not Inhibit Known Upstream Activators of Akt. It has been well documented that Akt is activated by extracellular stimuli and intracellular signal molecules, such as active Ras and Src, through a PI3K-dependent manner. Therefore, API-2 inhibition of Akt could result from targeting upstream molecule(s) of Akt. As PI3K and PDK1 are direct upstream regulators of Akt (Datta S. R. et al., Genes Dev, 1999. 13: p. 2905-2927), whether API-2 inhibits PI3K and/or PDK1 is examined. HEK293 cells are serum-starved and then can be treated with API-2 or PI3K inhibitor, wortmannin, for 30 min prior to EGF stimulation. PI3K is immunoprecipitated with anti-p110
antibody. The immunoprecipitates are subjected to in vitro PI3K kinase assay using PI-4-P as a substrate. As shown in FIG. 2A, the EGF-induced PI3K activity is inhibited by wortmannin but not by API-2. To evaluate the effect of API-2 on PDK1, an assay in which recombinant PDK1 promotes the threonine-309 phosphorylation of AKT2 peptides is used in the presence of lipid vesicles containing phosphotidylinositol. As shown in FIG. 2B, the assay is potently inhibited by the control PDK1 inhibitor staurosporine (IC50=5 nM). In contrast, API-2 displayed only 21% inhibition of the assay at the highest concentration tested (5.1 μM). To further evaluate the effect of API-2 on PDK1 activation, the autophosphorylation level of PDK1 at serine-241, a residue that is phosphorylated by itself and is critical for its activity is examined (Datta S. R. et al., Genes Dev, 1999. 13: p. 2905-2927), following API-2 treatment of HEK293 cells. Triplicate experiments show that phosphorylation levels of PDK1 are not inhibited by API-2 (FIG. 2B). However, PI3K inhibitor wortmannin can inhibit EGF-stimulated PDK1 (FIG. 2B).
API-2 Is Highly Selective for the Akt over PKC, PKA, SGK, STAT, JNK, p38, and ERK Signaling Pathways. Akt belongs to AGC (PKA/PKG/PKC) kinase family, which also include PKA, PKC, serum- and glucocorticoid-inducible kinase (SGK), p90 ribosomal S6 kinase, p70^S6K, mitogen- and stress-activated protein kinase and PKC-related kinase. Among AGC kinase family, protein structures of PKA, PKC and SGK are more close to Akt kinase than other members. Therefore, next examined are the effects of API-2 on the enzymatic activities of these 3 kinases. HEK293 cells are transfected with HA-tagged PKA, PKCα, or SGK. In vitro kinase assay and immunoblotting analysis show that the kinase activities of PKA and PKC
are inhibited by PKAI and Ro 31-8220, a PKC inhibitor, respectively, whereas API-2 exhibits no effect on their activities (FIGS. 2C and 2E). Further, serum-induced SGK kinase activity is attenuated by wortmannin but not by API-2 (FIG. 2D). In addition, it is determined whether API-2 has effect on other oncogenic survival pathways. Western blotting analyses with commercially available anti-phospho-antibodies reveals that phosphorylation levels of Stat3, JNK, p38 and Erk1/2 were not affected by API-2 treatment (FIG. 2F). These data indicate that API-2 specifically inhibits Akt signaling pathway.
API-2 Suppresses Cell Growth and Induces Apoptosis in Akt-overexpressing/activating Human Cancer Cell Lines. The ability of API-2 to selectively inhibit the Akt pathway suggests that it should inhibit proliferation and/or induces apoptosis preferentially in those tumor cells with aberrant expression/activation of Akt. As activation of Akt in human malignancies commonly results from overexpression of Akt or PTEN mutations, API-2 is used to treat the cells that express constitutively active Akt, caused by overexpression of AKT2 (OVCAR3, OVCAR8, PANC1 and AKT2-transformed NIH3T3) or mutations of the PTEN gene (PC-3, LNCaP, MDA-MB-468), and cells that do not (OVCAR5, DU-145, T47D, COLO357 and LXSN-NIH3T3) as well as melanoma cells that are activated by IGF-1 to activate Akt or do not respond to growth stimulation by IGF-1 (Satyamoorthy K. et al., Cancer Res, 2001. 61: p. 7318-7324). Immunoblotting analysis showed that phosphorylation levels of Akt are inhibited by API-2 only in the cells expressing elevated Akt or responding to IGF-1 simulation (FIG. 3A). Accordingly, API-2 inhibited cell growth to a much higher degree in Akt-overexpressing/activating cells as compared to those with low levels of Akt. As shown in FIG. 3B, API-2 treatment inhibited cell proliferation by approximately 50-60% in Akt-overexpressing/activating cell lines, LNCaP, PC-3, OVCAR3, OVCA8, PANC1, MDA-MB-468, and WM35, whereas only by about 10-20% in DU145, OVCAR5, COLO357, T47D and WM852 cells, which exhibit low levels of Akt or do not respond to growth stimulation by IGF-1. Moreover, API-2 induces apoptosis by 8-fold (OVCAR3), 6-fold (OVCAR8), 6-fold (PANC1), and 3-fold (AKT2-NIH3T3). No significant difference of apoptosis is observed between API-2 and vehicle (DMSO) treatment in OVCAR5, COLO357 and LXSN-NIH3T3 cells. Thus, API-2 inhibits cell growth and induces apoptosis preferentially in cells that express aberrant Akt.
API-2 Inhibits Downstream Targets of Akt. It has been shown that Akt exerts its cellular effects through phosphorylation of a number of proteins (Datta S. R. et al., Genes Dev, 1999. 13: p. 2905-2927). More than 20 proteins have been identified as Akt substrates, including the members of Forkhead protein family (FKHR, AFX and FKHRL1), tuberlin/TSC2, p70^S6K, GSK-3□, p21^WAF1/Cip1, p27^kip1, MDM2, Bad, ASK1 and IKK
etc. It is next examined whether API-2 inhibits downstream targets of Akt. As anti-phospho-tuberlin, -Bad, -AFX, and -GSK-3β antibodies are commercially available, therefore, the effect of API-2 on their phosphorylation induced by Akt was determined. Following API-2 (1 μM) treatment, OVCAR3 cells were lysed and immunoblotted with the individual anti-phospho-antibody. FIG. 4A shows that API-2 considerably inhibited the phosphorylation levels of tuberlin leading to stabilization and upregulation of tuberin (Dan, H. C., et al., J Biol Chem, 2002. 277: p. 35364-35370). The phosphorylation levels of Bad, GSK-3β, and AFX are partially attenuated by API-2, These data suggest that API-2 induces cell death and cell growth arrest by inhibiting phosphorylation of its downstream targets. API-2 inhibition of Akt downstream targets at different degrees could be due to the fact that phosphorylation sites of these targets are also regulated by other kinase(s), for instance, Bad serine-136 is phosphorylated by PAK1 in addition to Akt (Schurmann, A., et al. Mol Cell Biol 2000. 20: p. 453-461).

Example 2

Antitumor Activity in the Nude Mouse Tumor Xenograft Model

Tumor cells can be harvested, suspended in PBS, and can be injected s.c. into the right and left flanks (2×10⁶cells/flank) of 8-week-old female nude mice as reported previously (Sun, J. et al., Cancer Res, 1999. 59: p. 4919-4926, 1999). When tumors reach about 100-150 mm³, animals are randomized and dosed i.p. with 0.2 ml vehicle of the triciribine compound and/or a molecule that modulates the HER2/neu (erbB2) receptor, for example, trastuzumab, daily. Control animals receive DMSO (20%) vehicle, whereas treated animals can be injected with API-2 (1 mg/kg/day) in 20% DMSO.
API-2 Inhibits the Growth of Tumors in Nude Mice that Overexpress Akt Frequent overexpression/activation and/or amplification of AKT1 and AKT2 in human ovarian and pancreatic cancer was shown (Cheng J. Q. and Nicosia S. V., in Encyclopedic Reference of Cancer, 2001, Schwab D, Ed. Springer, Berlin Heidelberg and New York, p. 35-7). Inhibition of Akt pathway by inhibitors of PI3K., HSP70, Src and farnesyltransferase resulted in cell growth arrest and induction of apoptosis (Solit D. B. et al., Cancer Res, 2003. 63; p. 2139-2144; Xu, W., et al. Cancer Res, 2003. 63; p. 7777-7784). A recent study showed that the tumor growth of xenografts with elevated Akt was also significantly inhibited by intratumoral injection of adenovirus of dominant negative Akt (Jetzt A. et al., Cancer Res, 2003. 63: p. 697-706, 2003). Because API-2 inhibits Akt signaling and induces apoptosis and cell growth arrest only in cancer cells with elevated levels of Akt (FIG. 3), the growth of tumors with elevated levels of Akt should be more sensitive to API-2 than that of tumors with low levels of Akt in nude mice. To this end, s.c. Akt-overexpressing cells (OVCAR3, OVCAR8 and PANC-1) are s.c. implanted into the right flank, and those cell lines that express low levels of Akt (OVCAR5 and COLO357) into the left flank of mice. When the tumors reach an average size of about 100-150 mm³, the animals are randomized and treated i.p. with either vehicle or API-2 (1 mg/kg/day). As illustrated in FIG. 4B, OVCAR-5 and COLO357 tumors treated with vehicle grew to about 800-1,000 mm ³49 days after tumor implantation. OVCAR3, OVCAR8 and PANC1 tumors treated with vehicle control grew to about 700-900 mm ³49 days after tumor implantation. API-2 inhibited OVCAR3, OVCAR8 and PANC1 tumor growth by 90%, 88% and 80%, respectively. In contrast, API-2 has little effect on the growth of OVCAR5 and COLO357 cells in nude mice (FIGS. 4B-4D and data not shown). At dose 1 mg/kg/day, API-2 had no effects on blood glucose level, body weight, activity and food intake of mice. In treated tumor samples, Akt activity was inhibited by API-2 without change of total Akt content (FIG. 4E). Taken together, these results indicate that API-2 selectively inhibits the growth of tumors with elevated levels of Akt.

Example 3

TCN Directly Inhibits Wild Type Akt Kinase Activity

API-2 (TCN) can directly inhibit wild type Akt kinase activity induced by PDK1 in vitro (FIG. 1). This result supports that API-2 is a direct Akt inhibitor and that the underlying mechanism may be API-2 binding to PH domain and/or threonine-308 of Akt. An in vitro kinase assay is performed with recombinant of PDK1 and Akt in a kinase buffer containing phosphatidylinositol-3,4,5-P3 (PIP3), API-2 and histone H2B as substrate. After incubation of 30 min, the reactions were separated by SDS-PAGE and exposed in a film.

Example 4

TCN is Effective in Cancer Resistant Cells

The effects of TCN (API-2) are tested in cisplatin, paclitaxel, and tamoxifen resistant A270CP, C-13, OVCAR433 and MCF7/TAM cells. API-2 overcame cisplatin, paclitaxel, and tamoxifen resistance in these cells.

Example 5

TCN Potentiates Growth Inhibition by Trastuzumab and Induces Apoptosis

Materials and Methods
Cell Lines and Cell Cultures. The tumorigenic BT474.ml subline maintained in Dulbecco's modified Eagle's medium: Ham's F-12 medium (1:1) with 8-10% FBS.
Antibodies and Reagents. Trastuzumab was a gift from Genentech (San Francisco, Calif.). RAD001 (everolimus) was a gift from Novartis (East Hanover, N.J.). QLT0267 and KP 372-1 were gifts from QLT Inc. (Vancouver, BC). Triciribine (6-Amino4-methyl-8-((3-D-ribofuranosyl)-4H,8H-pyrrolo[4,3,2-de]pyrimido[4,5-c]pyridazine) was purchased from Berry & Associates, Inc. (Ann Arbor, Mich.), Edelfosine was purchased from Calbiochem (San Diego, Calif.). A selective Akt inhibitor, 4ADPIB (4-amino-2(3,4-dichloro-phenyl)-N-(1H-indazol-5-yl)-butyramide) (U.S. Pat. No. 6,919,340), was synthesized. PTEN antibodies were from Santa Cruz Biotechnology (Santa Cruz, Calif.). 3-actin antibodies were from Sigma (St. Louis, Mo.). All other antibodies were purchased from Cell Signaling Technology (Danvers, Mass.).
PTEN Antisense and Non-specific Oligonucleotide Transient Transfection. Antisense (AS) oligonucleotides specific for PTEN, control non-specific (NS) oligonucleotides and procedures for transfection were followed according to Nagata Y. et al., Cancer Cell, 2004. 6(2): p. 117-27.
Cell Proliferation Assay. PTEN AS/NS transfected BT474.ml cells were plated 2500 cells/0.32 cm²well. Cells were treated with inhibitors of the Akt/mTOR pathway alone or in combination with trastuzumab as described for 5 days and viable cells were measured by MTS assay using the CellTiter 96 AQ nonradioactive cell proliferation assay kits according to the manufacturer's protocol (Promega, Madison, Wis.). Treated cells were compared to control DMSO treated BT474.ml cells to calculate percentage of growth inhibition.
APO-BRDU TUNEL Assay. The PTEN AS and NS transfected BT474.ml cells were plated in 6-well plates (4-6×10⁵cells/well). Twenty-four hours after plating, the cells were treated as indicated for 72 hours with trastuzumab, TCN and/or RAD001. The floating and adherent cells were collected, labeled and stained using the APO-BRDU™ TUNEL assay kit (Phoenix Flow Systems, San Diego, Calif.) according to the manufacturer's protocol. Data was collected and analyzed using a FACScan flow cytometer and CellQuest Pro 4.02 software (Becton Dickinson, Franklin Lakes, N.J.). At least 10,000 events were examined.
SDS-PAGE and Immunoblot Analysis. Cells transfected with PTEN AS/NS oligonucleotides were treated as indicated. Immunoblotting was performed as described by Nagata Y. et al., Cancer Cell, 2004. 6(2): p. 117-27.
Results
Triciribine and RAD001 potentiate growth inhibition by trastuzumab in PTEN-deficient cells. To find a strategy to overcome trastuzumab resistance, particularly resistance caused by PTEN loss, 6 different small molecule inhibitors were tested, which directly or indirectly targeted the PI3K/Akt/mTOR signal transduction pathway, a major pathway activated by overexpression of ErbB2 and the loss of PTEN. The goal was to identify compounds that would exhibit synergistic effects with trastuzumab, preferably at a low dose of the compound in order to minimize toxicity. The drugs chosen targeted Akt, mTOR and integrin-linked kinase (ILK) (FIG. 9A). BT474.ml cells are a tumorigenic subline of the BT474 breast cancer cell line and express high levels of ErbB2, When PTEN levels are decreased by transfection with PTEN antisense oligonucleotides (PTEN AS), BT474.ml breast cancer cells become more resistant to the anti-proliferative effects of trastuzumab than cells with normal levels of PTEN and provide a good experimental model for breast cancers in which trastuzumab resistance is caused by PTEN loss (Nagata Y, et al. Cancer Cell, 2004. 6(2): p. 117-27 and FIGS. 9B and 9C). Nonspecific oligonucleotides (NS) were transfected as controls. Treatment with PTEN AS oligonucleotides effectively lowered PTEN levels (FIGS. 11A and 11B). Neither PTEN AS nor NS control oligonucleotides altered ErbB2 levels in the cells.
PTEN AS and NS-transfected BT474.ml cells were treated with each of the 6 compounds or trastuzumab alone and in combination for 5 days and evaluated cell proliferation as compared to DMSO-treated control. Using growth inhibition as a biological endpoint, we compared the ability of each drug to exhibit cooperative effects with trastuzumab using doses of drug that resulted in −20-40% growth inhibition when administered alone (FIG. 9A).
Almost all of the compounds displayed growth inhibitory effects, particularly at high concentrations and in cells with intact PTEN (FIG. 9A). However, two of the compounds, triciribine and RAD001, markedly enhanced growth inhibition in the PTEN AS cells when combined with trastuzumab as compared to trastuzumab or either compound alone (FIG. 9A). Triciribine (also called API-2), a compound that inhibits Akt activation, potentiated growth inhibition by trastuzumab over a 20-fold concentration range (FIG. 9B). The mTOR inhibitor RAD001 (everolimus) increased growth inhibition by trastuzumab when RAD001 was administered at low doses (<1 nM) (FIG. 9C). Strikingly, triciribine and RAD001 were able to cooperate with trastuzumab to inhibit cell growth at similar levels in the PTEN AS and NS cells (FIGS. 9B and 9C). In essence, triciribine and RAD001 were able to restore trastuzumab sensitivity to PTEN-deficient cells. Triciribine and RAD001 were also effective as single agents, both in PTEN AS and NS cells, at doses greater than 5 mM and 1.5 nM for triciribine and RAD001, respectively (FIGS. 9B and 9C).
A third compound, the ILK inhibitor QLT0267, potentiated growth inhibition by trastuzumab within a narrow dose range (−5-15 pM) (FIG. 9A). Because the dose range in which QLT0267 exhibited cooperative effects with trastuzumab was narrow, this compound further was not investigated further. At concentrations greater than 20 pM, QLT0267 had no cooperative effect with trastuzumab but significantly inhibited cell growth as a single agent.
Induction of Apoptosis Following Combination Treatment. To assess if growth inhibition was accompanied by apoptosis, we treated PTEN AS and NS transfected BT474.ml cells with triciribine, RAD001 and trastuzumab, alone or combined, and quantified the levels of apoptosis (FIG. 10). RAD001 did not significantly induce apoptosis alone or in combination with trastuzumab. Although the number of TUNEL-positive, apoptotic cells increased slightly following treatment with trastuzumab or triciribine alone, this increase was not statistically significant. However, the combination of triciribine and trastuzumab, significantly induced apoptosis as compared with all other treatments in both PTEN AS and NS transfected cells (FIG. 10).

Example 6

TCN inhibits activation of Akt and mTOR Inhibition of downstream signaling molecules. Immunoblot analysis verified that triciribine and RAD001 blocked activation of Akt and mTOR, important signaling molecules activated by ErbB2 and the targets of triciribine and RAD001 respectively. Phosphorylation of Akt on Thr308 and Ser473 was analyzed as an indicator of Akt activity and mTOR activity was assessed by the phosphorylation of p70S6K. (70-kDa ribosomal protein S6 kinase), an mTOR target. After triciribine treatment, phosphorylation of Akt on both sites was substantially decreased (FIG. 11A). In PTEN-deficient cells, the levels of Akt phosphorylation following triciribine and trastuzumab combination treatment were similar to those seen in cells with intact PTEN (FIG. 11A, lanes 4&8). Thus, triciribine overcame the adverse effects of PTEN loss by effectively blocking Akt activation. RAD001 dramatically blocked phosphorylation of p70S6K (FIG. 11B). However, RAD001 combined with trastuzumab did not lower p70S6K phosphorylation beyond that seen with RAD001 alone (FIG. 11B). A feedback loop has been recently identified which results in Akt phosphorylation and activation following treatment with mTOR inhibitors, such as RAD001 (O'Reilly K. E. et al., Cancer Res, 2006. 66(3): p. 1500-8). It was also observed that feedback activation of Akt by RAD001 and combination therapy with trastuzumab and RAD001 eliminated Akt phosphorylation by this feedback loop (FIG. 11B, lanes 3 vs. 4), consistent with the notion that Akt activation following mTOR inhibition is dependent on upstream receptor tyrosine kinases (O'Reilly K. E. et al., Cancer Res, 2006. 66(3): p. 1500-8). In summary, both drugs inhibited their predicted target kinases and combination treatment had a larger inhibitory effect on the Akt/mTOR signaling pathway than any single agent, even in PTEN-deficient cells.

Example 7

TCN and Trastuzumab Inhibit Tumor Growth in PTEN-Deficient Tumors

Materials and Methods
Xenograft Human Tumor Model in SCID Mice. Female, 6-week-old, severe combined immunodeficiency (SCID) mice were from Taconic Farms (Hudson, N.Y.). Tumor xenografts were performed as described in Nagata Y, et al., Cancer Cell, 2004. 6(2): p. 117-27. When the xenograft tumors reached the average size of 100-150 mm³, the mice were divided into 6 groups, each with 7 mice and an even distribution of tumor sizes, and treated as follows. PTEN antisense (30 pg) oligonucleotides were administered to each mouse weekly via intratumor injection. One week after PTEN AS oligonucleotide administration was initiated, drug treatment began. Trastuzumab was given at a dose of 0.5 mg/kg twice a week in 200 pL saline through intratumor injection at multiple sites. Triciribine was given at a dose of 0.5 mg/kg/day in 200 pL 20% DMSO saline solution through intraperitoneal (I.P.) injection. RAD001 was given via gavage at a dose of 1 pg/kg in 500 pL 5% glucose water twice a week. 20% DMSO saline solution (200 pL/day) was given through I.P. injection. The tumors were measured twice weekly with calipers and the volume of the tumors was calculated as: volume=length×width²/2.
Statistical Analysis. One-way ANOVA was performed using GraphPad Prism 3.0 for Windows (Graph Pad Software, San Diego, Calif.).
Results
The earlier biological and molecular data were very promising, however, in vivo studies provide the most stringent test for therapeutic efficacy. Therefore, triciribine and RAD001 were tested in vivo, BT474.ml cell xenografts were injected into the mammary fat pad of 6-week-old SCID mice. After tumors formed, the mice received PTEN AS weekly via intratumor injection. This protocol effectively models PTEN-deficient tumors in vivo (Nagata Y. et al., Cancer Cell, 2004. 6(2): p. 137-27). The mice were randomized into treatment groups receiving triciribine, RAD001, trastuzumab or DMSO alone or in combination. After treatment, the growth patterns of the tumors treated with DMSO, trastuzumab, RAD001, or triciribine alone were similar (FIGS. 12A and 12B). Growth of the tumors was not inhibited and the mice were euthanized after 3 weeks due to large tumor burdens. In contrast, combination treatment with triciribine and trastuzumab dramatically and significantly inhibited tumor growth (FIG. 12A). Many of the tumors actually decreased in size and four of 7 mice had no palpable tumors after 5 weeks of treatment. Following treatment with RAD001 and trastuzumab, tumor growth was relatively slower compared to RAD001 or trastuzumab alone (FIG. 12B). Thus combining trastuzumab with triciribine or RAD001 effectively inhibited ErbB2-overexpressing, PTEN-deficient human breast cancer xenografts in vivo.
This invention has been described with reference to its preferred embodiments. Variations and modifications of the invention will be obvious to those skilled in the art from the foregoing detailed description of the invention. It is intended that all of these variations and modifications be included within the scope of this invention.

Claims

1. A composition comprising:

(i) a compound of the formula I:

wherein each R2, R3′ and R5′ are independently hydrogen, optionally substituted phosphate or phosphonate (including mono-, di-, or triphosphate or a stabilized phosphate prodrug); acyl (including lower acyl); alkyl (including lower alkyl); amide, sulfonate ester including alkyl or arylalkyl; sulfonyl, including methanesulfonyl and benzyl, wherein the phenyl group is optionally substituted with one or more substituents as for example as described in the definition of an aryl given herein; optionally substituted arylsulfonyl; a lipid, including a phospholipid; an amino acid; a carbohydrate; a peptide; or cholesterol; or other pharmaceutically acceptable leaving group that, in vivo, provides a compound wherein R2′, R3′ or R5′ is independently H or mono-, di- or tri-phosphate;

wherein R^xand R^yare independently hydrogen, optionally substituted phosphate; acyl (including lower acyl); amide, alkyl (including lower alkyl); aromatic, polyoxyalkylene such as polyethyleneglycol, optionally substituted arylsulfonyl; a lipid, including a phospholipid; an amino acid; a carbohydrate; a peptide; or cholesterol; or other pharmaceutically acceptable leaving group. In one embodiment, the compound is administered as a 5′-phosphoether lipid or a 5′-ether lipid.

R₁and R₂each are independently H, optionally substituted straight chained, branched or cyclic alkyl (including lower alkyl), alkenyl, or alkynyl, CO-alkyl, CO-alkenyl, CO-alkynyl, CO-aryl or heteroaryl, CO-alkoxyalkyl, CO-aryloxyalkyl, CO-substituted aryl, sulfonyl, alkylsulfonyl, arylsulfonyl, aralkylsulfonyl;

(ii) trastuzumab or a salt thereof;

and

(iii) a pharmaceutically acceptable earner.

2. The composition of claim 1, wherein the compound of formula I is triciribine.

3. The composition of claim 1, wherein the compound of formula I is triciribine phosphate.

4. The composition of claim 1, wherein the compound of formula I is triciribine phosphonate.

5. The composition of claim 1, wherein the compound of formula I is present in a dose amount of at least 20 mg/m².

6. The composition of claim 1, wherein the compound of formula I is present in an amount of at least 10 mg/m².

7. The composition of claim 1, suitable for parenteral administration.

8. The composition of claim 1, wherein the parenteral administration is intravenous administration.

9. The composition of claim 1, suitable for oral administration.

10. The composition of claim 1, suitable for topical administration.

11. The composition of claim 1, wherein the trastuzumab or a salt thereof is present in an amount from about 1 mg to about 1000 mg.

12. The composition of claim 1, wherein the trastuzumab or a salt thereof is present in an amount from about 100 mg to about 500 mg.

13. The composition of claim 1, wherein the trastuzumab or a salt thereof is present in an amount from about 200 mg to about 450 mg.

14. The composition of claim 1, wherein the trastuzumab or a salt thereof is present in an amount of about 440 mg.

15. A method of treating a tumor or cancer in a mammal comprising administering to the mammal an effective amount of a composition comprising:

(i) a compound of formula I:

wherein each R2′, R3′ and R5′ are independently hydrogen, optionally substituted phosphate or phosphonate (including mono-, di-, or triphosphate or a stabilized phosphate prodrug); acyl (including lower acyl); alkyl (including lower alkyl); amide, sulfonate ester including alkyl or arylalkyl; sulfonyl, including methanesulfonyl and benzyl, wherein the phenyl group is optionally substituted with one or more substituents as for example as described in the definition of an aryl given herein; optionally substituted arylsulfonyl: a lipid, including a phospholipid; an amino acid; a carbohydrate; a peptide; or cholesterol; or other pharmaceutically acceptable leaving group that, in vivo, provides a compound wherein R2, R3′ or R5′ is independently H or mono-, di- or tri-phosphate;

R₁and R₂each are independently H, optionally substituted straight chained, branched or cyclic alkyl (Including lower alkyl), alkenyl, or alkynyl, CO-alkyl, CO-alkenyl, CO-alkynyl, CO-aryl or heteroaryl, CO-alkoxyalkyl, CO-aryloxyalkyl, CO-substituted aryl, sulfonyl, alkylsulfonyl, arylsulfonyl, aralkylsulfonyl; and

(ii) trastuzumab or a salt thereof.

16. The method of claim 15, wherein a compound of formula I and trastuzumab or a salt thereof are administered simultaneously.

17. The method of claim 15, wherein a compound of formula I is administered followed by the administration of trastuzumab or a salt thereof.

18. The method of claim 15, wherein the trastuzumab or a salt thereof is administered followed by the administration of a compound of formula I.

19. The method of claim 15, wherein the compound of formula I is administered one time per week for three weeks followed by a one week period wherein the compound is not administered.

20. The method of claim 15, wherein the trastuzumab or a salt thereof is administered one time per week for three weeks followed by a one week period wherein the compound is not administered.

21. The method of claim 20, wherein the dosing schedule is repeated at least twice.

22. The method of claim 20, wherein the dosing schedule is repeated at least 4 times.

23. The method of claim 15, wherein the tumor treated is breast, pancreatic, ovarian and colorectal tumors.

24. The method of claim 15, wherein at least 10 mg/m²of the compound of formula I is administered.

25. The method of claim 15, wherein at least 100 mg of trastuzumab or a salt thereof is administered.

26. The method of claim 15, wherein at least 200 mg of trastuzumab or a salt thereof is administered.

27. The method of claim 15, wherein at least 400 mg of trastuzumab or a salt thereof is administered.