Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
  • A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/28—Compounds containing heavy metals
  • A61K31/282—Platinum compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/335—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin
  • A61K31/337—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin having four-membered rings, e.g. taxol
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
  • A61K31/47—Quinolines; Isoquinolines
  • A61K31/475—Quinolines; Isoquinolines having an indole ring, e.g. yohimbine, reserpine, strychnine, vinblastine
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/535—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with at least one nitrogen and one oxygen as the ring hetero atoms, e.g. 1,2-oxazines
  • A61K31/5375—1,4-Oxazines, e.g. morpholine
  • A61K31/5377—1,4-Oxazines, e.g. morpholine not condensed and containing further heterocyclic rings, e.g. timolol
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/70—Carbohydrates; Sugars; Derivatives thereof
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K38/00—Medicinal preparations containing peptides
  • A61K38/04—Peptides having up to 20 amino acids in a fully defined sequence; Derivatives thereof
  • A61K38/05—Dipeptides
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00

Definitions

• cancer therapy is to prevent cancer cells from multiplying, invading, metastasizing, and ultimately killing their host organism, e.g. a human or other mammal.
• host organism e.g. a human or other mammal.
• cancer therapy also have toxic effects on normal cells, particularly those with a rapid rate of turnover, such as bone marrow and mucous membrane cells.
• the goal in selecting an effective cancer therapy therefore, is to find a therapy that has a marked growth inhibitory or controlling effect on the cancer cells and a minimal toxic effect on the host.
• Cancer therapies include classic chemotherapy with antiproliferative agents (typically, small molecules) that target all dividing cells; molecular targeted therapy designed to specifically target cancer cells, such as functional therapy designed to alter a molecular function in the cancer cells with gene therapy, antisense therapy, and drugs such as erlotinib hydrochloride, gefitinib, and irnatinib mesylate, and phenotype-directed therapy designed to target the unique phenotype of cancer cells such as therapy with monoclonal antibodies, imrnunotoxi s, radioimmunoconjugates, and cancer vaccines; biologic therapy with cytokines such as interleukin-2 and interferon- ; and radiotherapy.
• classic chemotherapy with antiproliferative agents typically, small molecules
• molecular targeted therapy designed to specifically target cancer cells, such as functional therapy designed to alter a molecular function in the cancer cells with gene therapy, antisense therapy, and drugs such as erlotinib hydrochloride, gefitinib, and
• Cancers are frequently characterized as being resistant (not showing a response during the initial course of therapy) or refractory (having shown an initial response, then relapsed, and not showing a response on a later course of therapy) to anticancer therapies.
• Resistance to one anticancer drug e.g. a platinum anticancer compound such as cisplatin, is often associated with cross-resistance to other drugs of the same class, e.g. other platinum compounds.
• Multiple drug resistance also called pleiotropic drug resistance, is a phenomenon where treatment with one drug confers resistance not only to that drug and others of its class but also to unrelated agents.
• Anticancer therapies are frequently employed in combination, for several principal reasons.
• treatment with two or more non-cross- resistant therapies may prevent the formation of resistant clones;
• the combination of two or more therapies that are active against cells in different phases of growth (resting - G 0 , postmitotic — G l5 DNA synthesis - S, premitotic — G 2 , and mitotic — M) may kill cells that are dividing slowly as well as those that are dividing actively and/ or recruit cells into a more actively dividing state, making them more sensitive to many anticancer therapies; and
• the combination may create a biochemical enhancement effect by affecting different pathways or different steps in a single biochemical pathway.
• two or more therapies may be employed in full or nearly full amounts, and the effectiveness of each therapy will be maintained in the combination; thus, traditional myelosuppressive drugs may be supplemented by non-myelosuppressive drugs such as the vinca alkaloids, prednisone, and bleomycin; and combination chemotherapies have been developed for a number of cancers that are not curable with single agents.
• Combinations of two or more of chemotherapy, molecular targeted therapy, biologic therapy, and radiotherapy are also known and used.
• Glutathione in its reduced form, is a tripeptide of the formula: ⁇ - ⁇ --Glu-L- Cys-Gly.
• Reduced glutathione has a central role in maintaining the redox condition in cells , and is also an essential substrate for glutathione S-transferase (GST).
• GST exists in mammals as a superfamily of isoenzymes which regulate the metabolism and detoxification of foreign substances introduced into cells. In general, GST can facilitate detoxification of foreign substances (including anticancer drugs), but it can also convert certain precursors into toxic substances.
• the isoenzyme GST Pl-1 is constitutively expressed in many cancer cells, such as ovarian, non-small cell lung, breast, colorectal, pancreatic, and lymphoma tissue (more than 75% of human tumor specimens from breast, lung, liver, and colorectal cancers are reported to express GST Pl-1). It is frequently overexpressed in tumors following treatment with many chemotherapeutic agents, and is seen in cancer cells that have developed resistance to these agents.
• L is an electron withdrawing leaving group
• AA C is an amino acid linked through a peptide bond to the remainder of the compound, and their syntheses.
• the compounds of the patent are stated to be useful drugs for the selective treatment of target tissues which contain compatible GST isoenzymes, and simultaneously elevate the levels of GM progenitor cells in bone marrow.
• Disclosed embodiments for L include those that generate a drug that is cytotoxic to unwanted cells, including the phosphoramidate and phosphorodiamidate mustards.
• TLK286 is the compound of the formula
• TLK286 as the hydrochloride salt has the proposed United States Adopted Name of canglustratide hydrochloride.
• TLK286 is an anticancer compound that is activated by the actions of GST Pl-1, and by GST Al-1, to release the cytotoxic phosphorodiamidate mustard moiety. Following activation of TLK286 by GST Pl-1, apoptosis is induced through the stress response signaling pathway with the activation of MKK4, JNK, p38 MAP kinase, and caspase 3.
• TLK286 has been shown to be more potent in the M6709 human colon carcinoma cell line selected for resistance to doxorubicin and the MCF-7 human breast carcinoma cell line selected for resistance to cyclophosphamide, both of which overexpress GST Pl-1, over their parental cell lines; and in murine xenografts of M7609 engineered to have high, medium, and low levels of GST Pl-1, the potency of TLK286 was positively correlated with the level of GST Pl-1 (Morgan et al., Cancer Res., 58:2568 (1998)).
• TLK286, as its hydrochloride salt, is currently being evaluated in multiple clinical trials for the treatment of ovarian, breast, non-small cell lung, and colorectal cancers. It has demonstrated significant single agent antitumor activity and improvement in survival in patients with non-small cell lung cancer and ovarian cancer, and single agent antitumor activity in colorectal and breast cancer. Evidence from in vitro cell culture and tumor biopsies indicates that TLK286 is non-cross resistant to platinum, paclitaxel, and doxorubicin (Rosario et al., Mol. Pham co/., 58:167 (2000)), and also to gemcitabine. Patients treated with
• TLK286 show a very low incidence of clinically significant hematological toxicity.
• TLK231 (TER 231), L- ⁇ -glutamyl-
• this invention is a method of combination cancer therapy in a mammal, especially a human, comprising administering a therapeutically effective amount of a GST-activated anticancer compound and a therapeutically effective amount of another anticancer therapy, that is, an anticancer therapy that is not a treatment with a
• this invention is a method of potentiating an anticancer therapy in a mammal, especially a human, comprising administering a therapeutically effective amount of a GST-activated anticancer compound to the mammal being treated with the anticancer therapy.
• this invention is a pharmaceutical composition for anticancer therapy comprising a GST-activated anticancer compound, one or more of another anticancer chemotherapy agent, a molecular targeted therapy agent, or a biologic therapy agent, and an excipient.
• this invention is a pharmaceutical product or kit for anticancer therapy comprising a GST-activated anticancer compound in dosage form and one or more of another anticancer chemotherapy agent, a molecular targeted therapy agent, or a biologic therapy agent, also in dosage form.
• this invention is the use of a GST-activated anticancer compound and one or more of another anticancer chemotherapy agent, a molecular targeted therapy agent, or a biologic therapy agent, in the manufacture of a medicament for the treatment of cancer in a mammal, especially a human.
• this invention is the use of a GST-activated anticancer compound in the manufacture of a medicament for the treatment of cancer in a mammal, especially a human, that is being treated with radiation therapy.
• the GST-activated anticancer compound is a compound of US Patent No. 5,556,942, especially TLK286 or an amide, ester, amide/ester, or salt thereof, particularly a salt of TLK286, especially TLK286 hydrochloride, and these preferences and preferred another anticancer therapies are characterized by the specification and by the features of method claims 2 through 20.
• the combination cancer therapy of this invention excludes combination therapy with the two-drug combination of TLK286 and docetaxel; or includes combination therapy with the two-drug combination of TLK286 and docetaxel only with dosages of TLK286 of 60 — 1280 mg/m 2 , especially 400 - 1000 mg/m 2 , and dosages of docetaxel of 35 — 100 mg/m 2 , especially 50 - 100 mg/m 2 .
• Fig. 1 shows the inhibition of growth of OVCAR-3 cells treated with carboplatin
• Fig. 2 shows the inhibition of growth of DLD-1 cells treated with oxaliplatin
• TLK286, and oxaliplatin + TLK286 are oxaliplatin + TLK286.
• Fig. 3 shows the inhibition of growth of ONCAR-3 cells treated with doxorubicin
• Fig. 4 shows the inhibition of proliferation of MCF-7 cells treated with docetaxel
• TLK286, and docetaxel + TLK286 are examples of TLK286, and docetaxel + TLK286.
• Fig. 5 shows the inhibition of proliferation of A-549 cells treated with cisplatin
• Fig. 6 shows the inl-ibition of proliferation of A-549 cells treated with paclitaxel, TLK286, and paclitaxel + TLK286.
• Fig. 7 shows the inhibition of growth of MCF-7 cells treated with gemcitabine
• TLK286, and gemcitabine + TLK286 are gemcitabine + TLK286.
• Fig. 8 shows the inhibition of growth of RL cells treated with lituximab, TLK286, and lituximab + TLK286.
• Fig. 9 shows the inhibition of growth of MX-1 cells treated with gefitinib, TLK286, and gefitinib + TLK286.
• a "GST-activated anticancer compound” is a compound comprising glutathione or a glutathione analog chemically linked to a cytotoxic moiety such that the cytotoxic moiety is released by cleavage from the glutathione or glutathione analog in the presence of one or more. GST isoenzymes.
• Suitable such compounds include those disclosed in US Patent No. 5,556,942 and are of the formula
• L is a cytotoxic electron withdrawing leaving group
• each of R 1 , R 2 and R 3 is independently H or a non-interfering substituent, such as H, optionally substituted - alkyl (for example, methyl, tetf-bwtyL, cyclohexyl, and the like), optionally substituted C 6 -C 12 aryl (for example, phenyl, naphthyl, pyridyl, and the like), optionally substituted C 7 -C 12 aralkyl (for example, benzyL phenylethyl, 2-pyiidylethyl, and the like), cyano, halo, optionally substituted C r C 6 alkoxy, optionally substituted C 6 -C 12 aryloxy, or optionally substituted C 7 -C 12 aral
• Y is selected from the g ⁇ oup consisting of
• AA C is an amino acid linked through a peptide bond to the remainder of the compound.
• R 1 is H, C ⁇ C 4 alkyl, or phenyl, especially H or phenyl, particularly H; each R 2 is independently chosen from H and - alkyl, especially H; each R 3 is independently chosen from H, -C 4 alkyl, and phenyl, especially H; n is 0;
• AA C is glycine, phenylglycine, ⁇ -alanine, alanine, phenylalanine, valine, 4-aminobutyric acid, aspartic acid, histidine, tryptophan, and tyrosine, as either the (S)- or (R)-isomers, optionally substituted on the phenyl ring as described above for R 1 through R 3 , especially glycine, phenylglycine, ⁇ -alanine, alanine, or phenyklanine, and particularly (R)-phenylglycine.
• Suitable amides and esters of these compounds include those in which one or more of the carboxyl groups is amidated or esteiified to form a C r C 6 alkyl or alkenyl, C ⁇ -C 10 aryl, or C 7 -C 12 aralkyl amide or ester, in which the alkyl or aryl groups may be optionally substituted with noninterfering substituents such as halo, alkoxy, or all-ylamino.
• the amides and esters may be monoamides, diamides, or (if applicable) taamides, monoesters, diesters, or (if applicable) triesters, or mixed amide-esters.
• Suitable salts are those formed when inorganic bases (e.g. sodium, potassium, and calcium hydroxide) or organic bases (e.g. ethanokmine, diethanolamine, tiethanolamine, ethylenediamine, trometiiamine, N-metliylglucamine) react with the carboxyl groups, and those formed when inorganic acids (e. g hydrochloric, hydrobromic, sulfuric, nitric, and chlorosulfonic acids) or organic acids (e.g.
• inorganic bases e.g. sodium, potassium, and calcium hydroxide
• organic bases e.g. ethanokmine, diethanolamine, tiethanolamine, ethylenediamine, trometiiamine, N-metliylglucamine
• inorganic acids e. g hydrochloric, hydrobromic, sulfuric, nitric, and chlorosulfonic acids
• organic acids e.g.
• acetic, propionic, oxalic, malic, maleic, malonic, fumaric, or tartaric acids, and alkane- or arenesulfonic acids such as methanesulfonic, ethanesulfonic, benzenesulfonic, substituted benzenesulfonic such as chlorobenzenesulfonic and toluenesulfonic, naphthalenesulfonic and substituted naphtlialenesulfonic, naphthalenedisulfonic and substituted naphthalenedisulfonic, and camphorsulfonic acids) react to form acid addition salts of the amine groups.
• Mixed amide salts .and ester salts are also included, as are hydrates and other solvates as well as unsolvated forms.
• a particularly preferred GST-activated anticancer compound is TLK286, as its hydrochloride salt (throughout the specification, reference to TLK286 should be taken to mean TLK286 as its hydrochloride salt).
• TLK286 As a monotherapy for a number of cancers, including ovarian, breast, non-small cell lung, and colorectal cancers, TLK286 has been administered by intravenous infusion at doses of 400 - 1000 mg/m 2 body surface area at once/week and once/three weeks. [0041] As a combination therapy with docetaxel (75 mg/m 2 ), TLK 286 has been administered at 500, 750, and 960 mg/m 2 at 3-weekly intervals. As a combination therapy with carboplatin (AUC 5 or 6 mg/mL'min), TLK 286 has been administered at 500, 750, and 960 mg/m 2 at 3- to 4-weekly intervals. As a combination therapy with liposomal doxorubicin (40 or 50 mg/m 2 ), TLK 286 has been administered at 500, 750, and 960 mg/m 2 at 4-weekly intervals.
• “Another anticancer therapy” is an anticancer therapy that is not a treatment with a GST-activated anticancer compound, especially a compound disclosed in paragraphs [0034] to [0037] above.
• Such “another anticancer therapies” include classic chemotherapy; molecular targeted therapy; biologic therapy; and radiotherapy. These therapies are those used as monotherapy or in combination therapy.
• Chemotherapeutic agents include: alkylating agents, including: alkyl sulfonates such as busulfan, eti ⁇ yleneimine derivatives such as thiotepa, nitrogen mustards such as chlorambucil, cyclophosphamide, estramustine, ifosfamide, mecMoretiiamine, melphalan, and uramustine, nitrosoureas such as carmustine, lomustine, and streptozocin, triazenes such as dacarbazine, procarbazine, and temozolamide, and platinum compounds such as cisplatin, carboplatin, oxaliplatin, satraplatin, and
• antimetabolites including: antifolates such as methotrexate, permetrexed, raltitrexed, and trirnetrexate,sustainablee analogs such as cladribine, chlorodeoxyadenosine, clofarabine, fludarabine, mercaptopurine, pentostatin, and tmoguanine, pyidniidine analogs such as azacitidine, capecitabine, cytarabine, edatrexate, floxu-adine, fluorouracil, gemcitabine, and troxacitabine; natural products, including: antitumor antibiotics such as bleomycin, dactinomycin, mithramycin, mitomycin, mitoxantrone, porfiromycin, and anthracyclines such as da
• corticosteroids such as dexamethasone and prednisone
• estrogens such as diethylstilbestrol
• antiestrogens such as fulvestrant, raloxifene, tamoxifen, and toremifine
• LHRH agonists and antagonists such as buserelin, goserelin, leuproHde, and tiiptorelin, progestins such as medroxyprogesterone acetate and megestrol acetate, and thyroid hormones such as levothyroxine and Hothyronine; and miscellaneous agents, including altretamine, arsenic ttioxide, gallium nitrate, hydroxyurea, levamisole, mitotane, octreotide, procarbazine, suramin, thaHdomide, photodynamic compounds such as methoxsalen and sodium porfimer, and proteasome inhibitors such as bortezomib.
• miscellaneous agents including altretamine, arsenic ttioxide, gallium nitrate, hydroxyurea, levamisole, mitotane, octreotide, procarbazine,
• Molecular targeted therapy agents include: functional therapeutic agents, including: gene therapy agents, antisense therapy agents, tyrosine kinase inhibitors such as erlotinib hydrochloride, gefitinib, imatinib mesylate, and semaxanib, and gene expression modulators such as the retinoids and rexinoids, e.g.
• phenotype-directed therapy agents including: monoclonal antibodies such as alemtuzumab, bevacizumab, cetuximab, ibritumomab tiuxetan, rituximab, and trastuzumab, immunotoxins such as gemtuzumab ozogamicin, racHoimmunoconjugates such as l31 I-tositumomab, and cancer vaccines.
• Biologic therapy agents include: interferons such as interfeiOn- 2a and interferon- 2b , and interleukins such as aldesleuldn, denileukin difritox, and oprelvekin.
• cancer therapies include the use of protective or adjunctive agents, including: cytoprotective agents such as amifostine, dexrazonxane, and mesna, phosphonates such as pamidronate and zoledronic acid, and stimulating factors such as epoetin, darbeopetin, f ⁇ lgrastim, PEG-filgrastim, and sargramostim.
• cytoprotective agents such as amifostine, dexrazonxane, and mesna
• phosphonates such as pamidronate and zoledronic acid
• stimulating factors such as epoetin, darbeopetin, f ⁇ lgrastim, PEG-filgrastim, and sargramostim.
• Combination cancer therapy regimens with which the GST-activated anticancer compound may be combined include all regimens involving the use of two or more of the anticancer therapies (anticancer agents) such as those mentioned in paragraphs [0044] to [0047] above and/ or radiotherapy, optionally including protective and adjunctive agents such as those mentioned in paragraph [0048] above; and TLK286 can be added to existing anticancer regimens known for the treatment of various cancers, such as the regimens mentioned in paragraph [0006] above.
• anticancer agents such as those mentioned in paragraphs [0044] to [0047] above and/ or radiotherapy
• protective and adjunctive agents such as those mentioned in paragraph [0048] above
• TLK286 can be added to existing anticancer regimens known for the treatment of various cancers, such as the regimens mentioned in paragraph [0006] above.
• combination chemotherapeutic regimens are known to the art, such as combinations of platinum compounds and taxanes, e.g. carboplatin/pacHtaxel, capecitabine/docetaxel, the "Cooper regimen", fluorouracH-levamisole, fluorouracil- leucovorin, methotrexate-leucovorin, and those known by the acronyms ABDIC, ABVD, AC, ADIC, Al, BACOD, BACOP, BVCPP, CABO, CAD, CAE, CAF, CAP, CD, CEC, CF, CHOP, CHOP+rituximab, CIC, CMF, CMFP, CyADIC, CyNADIC, DAC, DND, FAC, FAC-S, FAM-S, FOLFOX-4, FOLFOX-6, M-BACOD, MACOB-B, MAID, MOPP, MNAC, PCN, T-5, NAC, NAD, NAPA, NAP-
• Combinations of chemotherapies and molecular targeted therapies, biologic therapies, and radiation therapies are also well known to the art; including therapies such as trastuzumab + pacHtaxel, alone or in further combination with carboplatin, for certain breast cancers, and many other such regimens for other cancers; and the "Dublin regimen” (555 mg/m 2 fluorouracil IN over 16 hours on days 1 — 5 and 75 mg/m” cisplatin IN over 8 hours on day 7, with repetition at 6 weeks, in combination with 40 Gy radiotherapy in 15 fractions over the first 3 weeks) and the "Michigan regimen” (fluorouracil + cisplatin + vinblastine + radiotherapy), both for esophageal cancer, and many other such regimens for other cancers.
• therapies such as trastuzumab + pacHtaxel, alone or in further combination with carboplatin, for certain breast cancers, and many other such regimens for other cancers
• the "Dublin regimen” 555 mg/m 2 flu
• This invention is a method of combination cancer therapy in a mammal, especially a human, by adniinistering a therapeutically effective amount of a GST-activated anticancer compound and a therapeutically effective amount of another anticancer therapy.
• Combination therapy means the aclministration of the GST-activated anticancer compound and the another anticancer therapy during the course of cancer chemotherapy. Such combination therapy may involve the adierinistration of the GST-activated anticancer compound before, during, and/or after the ac xLinistration of the another anticancer therapy.
• the adix-inistration of the GST-activated anticancer compound may be separated in time from the aclministration of the another anticancer therapy by up to several weeks, and may precede it or follow it, but more commonly the administration of the GST-activated anticancer compound will accompany at least one aspect of the another anticancer therapy (such as the administration of one dose of a chemotherapeutic agent, molecular targeted therapy agent, biologic therapy agent, or radiation therapy) within up to 48 hours, and most commonly within less than 24 hours.
• a chemotherapeutic agent such as the administration of one dose of a chemotherapeutic agent, molecular targeted therapy agent, biologic therapy agent, or radiation therapy
• a “therapeutically effective amount” means that amount which, when ackninistered to a mamrnal, especially a human, for treating a cancer, is sufficient to effect treatment for the cancer.
• Treating" or “treatment” of a cancer in a mammal includes one or more of:
• Cancers which may be effectively treated by the method of this invention include mammaHan cancers, especially human cancers. Cancers that are particularly treatable by the method of this invention are cancers with sensitivity to inducers of apoptosis, and more specifically those cancers that express or, particularly, overexpress one or more glutathione S-transferase isoenzymes. Cancers that express or overexpress one or more glutathione S- transferase isoenzymes when treated with other anticancer compounds or combination cancer chemotherapy regimens (i.e. those not including a GST-activated anticancer compound ) are especially treatable by the method of this invention.
• Such cancers include cancers of the brain, breast, bladder, cervix, colon and rectum, esophagus, head and neck, kidney, lung, Hver, ovary, pancreas, prostate, and stomach; leukemias such as ALL, AML, AMML, CLL, CML, CMML, and hairy cell leukemia; Hodgkin's and non-Hodgkin's lymphomas; mesotheHomas, multiple myeloma; and sarcomas of bone and soft tissue.
• TLK286 as the GST-activated anticancer compound
• TLK296 would also be useful for the same cancers because it also is activated by GST Pl-1.
• Other GST-activated anticancer compounds are expected to be suitable for these or other cancers depending on the nature of the GST isoenzymes expressed by the cancer being treated.
• the method of this invention comprises combining the administration of a therapeutically effective amount of a GST-activated anticancer compound and a therapeutically active amount of another anticancer therapy.
• the another anticancer therapy will generally be one that has utility in the treatment of the cancer being treated even without the concomitant ack ⁇ inistration of the GST-activated anticancer compound; and a suitable such another anticancer therapy for a particular cancer to be treated will be determinable by a person of ordinary skill in the art having regard to that knowledge and this disclosure. It is of course contemplated that the combination therapy of this invention may be used with anticancer therapies not yet in use.
• the GST-activated anticancer agent may also be used as adjuvant or neoadjuvant therapy accompanying radiation therapy.
• the amount of the GST-activated anticancer compound that is administered to the mammal should be a therapeutically effective amount when used in conjunction with the another anticancer therapy; and similarly the amount of the another anticancer therapy that is adirritained to the mammal should be a therapeutically effective amount when used in conjunction with the GST-activated anticancer compound.
• the therapeutically effective amount of either the GST-activated anticancer compound and the amount of the another anticancer therapy when administered in the combination cancer chemotherapy of this invention may each be less than the amount which would be therapeutically effective if deHvered to the mammal alone.
• TLK286 it is expected that TLK286 will be administrable at essentially its maximum tolerated dose as a single agent, and no reduction in the amount of the another anticancer therapy will be required. Examples 10 through 12 illustrate that this has been shown for three common anticancer agents.
• GST Pl-1 is overexpressed when cancer cell lines are treated with known anticancer therapies such as treatment with plat- ⁇ um-cont-tining compounds and doxorubicin; and the rise in GST Pl-1 is correlated with an increase in resistance to the anticancer therapy. Because compounds such as TLK286 are activated by GST Pl-1 to release the cytotoxic phosphorodiamidate moiety, cancer cells that have been treated with another anticancer therapy will contain an elevated level of GST Pl-1 and will therefore increase the activity of TLK286 in these cells, increasing its cytotoxicity.
• Suitable dosing for TLK286 as the GST-activated anticancer compound is about 60 - 1280 mg/m 2 body surface area, especially 500 - 1000 mg/m 2 . Dosing may be at 1 - 35 day intervals; for example, about 500 - 1000 mg/m 2 at 1 - 5 week intervals, especially at 1, 2, 3, or 4 week intervals, or at higher frequencies including as frequently as once/day for several (e.g. 5 or 7) days, with the dosing repeated every 2, 3, or 4 weeks, or constant infusion for a period of 6 — 72 hours, also with the dosing repeated every 2, 3, or 4 weeks; and such dosing flexibility will readily enable combination therapy with the anticancer therapies now used. Suitable dosages and dose frequencies for other GST-activated anticancer compounds will be readily detenninable by a person of ordinary skill in the art having regard to that skill and this disclosure.
• Suitable dosing for the other anticancer therapy will be the dosing already estabHshed for that therapy, as described in such documents as diose Hsted in paragraph [0006].
• Such dosing varies widely with the therapy: for example, capecitabine (2500 mg/m 2 orally) is dosed twice daily for 2 weeks on and 1 week off, iinatinib mesylate (400 or 600 mg/day orally) is dosed daily, rituximab is dosed weekly, pacHtaxel (135 - 175 mg/m 2 ) and docetaxel (60 - 100 mg/m 2 ) are dosed weeldy to every three weeks, carboplatin (4 - 6 mg/rr--L # min) is dosed once every 3 or 4 weeks (though the doses may be spHt and administered over several days), nitrosourea alkylating agents such as carmustine are dosed as infrequently as once every 6 weeks.
• Radiotherapy may be administered as frequently as weekly (or even within that spHt into smaller dosages administered daily).
• a person of ordinary skill in the art of cancer therapy will be able to ascertain a therapeutically effective amount of the GST-activated anticancer compound and a therapeuticaUy effective amount of another anticancer therapy for a given cancer and stage of disease without undue experimentation and in reHance upon personal knowledge and the disclosure of this appHcation.
• the GST-activated anticancer compound and die another anticancer therapy may be administered by any route suitable to the subject being treated and the nature of the subject's condition.
• Routes of ackrjinistration include, but are not limited to, administration by injection, including intravenous, intraperitoneal, intramuscular, and subcutaneous injection, by transmucosal or transdermal deHvery, through topical appHcations, nasal spray, suppository and the like or may be administered or-dly.
• Formulations may optionally be Hposomal formulations, emulsions, formulations designed to aclminister the drug across mucosal membranes or transdermal formulations.
• Suitable formulations for each of these methods of administration may be found, for example, in Remington: The Science and Practice of Pharmacy, 20th ed., A. Gennaro, ed., Lippincott WiOiams & Wilkins, Philadelphia, Pennsylvania, U.S.A.
• Typical formulations will be either oral (as for compounds such as capecitabine) or solutions for intravenous infusion.
• Typical dosage forms will be tablets (for oral adiT-i ⁇ istration), solutions for intravenous infusion, and lyophilized powders for reconstitution as solutions for intravenous infusion.
• Kits may contain the GST-activated anticancer compound as a dosage form, and the another chemotherapy agent, molecular targeted therapy agent, and/or biologic therapy agent, also in dosage form, for example packaged together in a common outer packaging.
• Combinations considered of particular present interest are the combination administration of TLK286: with a platinum compound such as carboplatin or cisplatin, optionaHy in further combination with gemcitabine or a taxane such as docetaxel or pacHtaxel; with gemcitabine; with a taxane; with an anthracycline such as doxorubicin or Hposomal doxorubicin; with oxaHplatin, optionaUy in further combination with capecitabine or fluorouracil/leucovorin; and with gemcitabine or a platinum compound such as carboplatin or cisplatin, in further combination with a vinca aHcaloid such as vinorelbine.
• the human cancer ceH lines A549 (lung carcinoma), DLD-1 (colorectal adenocarcinoma), HT29 (colorectal adenocarcinoma), K-562 (chronic myelogenous leukemia), MCF-7 (breast adenocarcinoma), MG-63 (osteosarcoma), ONCAR- 3 (ovarian adenocarcinoma), and RL (non-Hodgkin's B ceU lymphoma) were obtained from the American Type Culture CoHection, Manassas, Virginia, U.S.A.
• the human breast carcinoma ceH line MX-1 was obtained from the National Cancer Institute, Bethesda, Maryland, U.S.A.
• Gefitinib and TLK286 were prepared by Telik.
• Carboplatin, cisplatin, doxorubicin, and pacHtaxel were obtained from Sigma-Aldrich Chemical Company, St. Louis, Missouri, U.S.A.
• Docetaxel was obtained from Aventis Pharmaceuticals Inc., gemcitabine from EH LiHy and Company, oxaHplatin from Sanofi-Synthelabo Inc., and rituxan from IDEC Pharmaceuticals Corporation.
• the human ovarian cancer ceU line ONCAR-3 was seeded at 4 10 4 ceUs/mL, 150 ⁇ L/weU, and aUowed to attach to the weUs for 4 - 5 hours.
• the diluted compounds or solvent controls were then added at 50 ⁇ L/weH.
• Incubation with TLK286 alone and in combination with carboplatin was continued for approximately three ceH doublings, and ceU viabiHty was determined using the Wst-1 assay, where the plates were pulsed with the metaboHc dye Wst-1 (Roche Diagnostics Corporation, IndianapoHs, Indiana, U.S.A.) (20 ⁇ L/weH) and incubated for 1 - 2 hours.
• Example 1 shows the activity of TLK286 (at 3.1 ⁇ M, about IC 30 ) and carboplatin (at concentrations between about 1.85 and 4 ⁇ M, from nearly no effect to nearly maximum inhibition), and clearly iHustrates the beneficial effect of the combination.
• Example 2 TLK286 and oxaHplatin
• the human colon cancer ceH line DLD-1 was seeded at 4 X 10 4 ceUs/mL,
• TLK286 and oxaHplatin were also assayed in die human colorectal cancer ceU line HT-29, and a beneficial effect of the combination was also seen.
• TLK286 and doxorubicin were also assayed in die human colorectal cancer ceU line HT-29, and a beneficial effect of the combination was also seen.
• Doxorubicin is as a DNA intercalating agent that blocks DNA and RNA synthesis and affects topoisomerase II. Doxorubicin also alters membrane fluidity and generates semiquinone free radicals.
• the human chronic myelogenous leukemia ceU line K-562, the human osteosarcoma ceU line MG-63, and the human ovarian cancer ceU line OVCAR-3 were each incubated with TLK286 alone and in combination with doxorubicin, and ceU viability determined. The results were analyzed according to the Combination Index mediod with the "CalcuSyn" program from Biosoft.
• the assay is based on the incorporation of BrdU, an analogue of ti ymidine, during D ⁇ A synthesis.
• the incorporation of BrdU which reflects the extent of ceH proHferation, was then quantitated with an ELISA kit (also from Roche Diagnostics Corporation).
• the results were analyzed according to the Combination Index method. Data using combinations of TLK286 and docetaxel at fixed and variable ratios were synergistic to additive.
• Fig. 4 shows the activity of TLK286 (at 3.3 ⁇ M, about IC 40 ) and docetaxel (at concentrations between about 0.8 and 3 nM, from nearly no effect to about 60% inhibition) and, and clearly illustrates the beneficial effect of the combination.
• Example 5 TLK286 and cisplatin.
• TLK286 and cisplatin were assayed in the human lung cancer ceU line A-549, using a method sknilar to that of Example 4.
• Fig. 5 shows the activity of TLK286 (at 4 ⁇ M, about IC 50 ) and cisplatin (at concentrations between about 0.5 and 8 ⁇ M, from nearly no effect to nearly maxknum inhibition), and clearly illustrates the beneficial effect of the combination.
• Example 6 TLK286 and pacHtaxel
• TLK286 and pacHtaxel were assayed in the human lung cancer ceH line A-549, using a mediod similar to that of Example 4.
• Fig. 6 shows die activity of TLK286 (at 6 ⁇ M) and pacHtaxel (at concentrations between about 1 and 6 nM, from nearly no effect to neady maximum inhibition), and clearly illustrates the beneficial effect of d e combination.
• TLK286 and pacHtaxel were also assayed in the human ovarian cancer ceU line ONCAR-3, and a beneficial effect of the combination was also seen.
• Example 7. TLK286 and gemcitabine
• TLK286 and gemcitabine were assayed in the human breast cancer ceU line MCF-7, using a method similar to d at of Example 1.
• Fig. 7 shows d e activity of TLK286 and gemcitabine, alone and in combination, at concentrations between about 0.1 and 4 IC 50 , and clearly illustrates the beneficial effect of the combination.
• TLK286 and titxtximab were assayed in the human non-Hodgkin's B ceU lymphoma ceU line RL, using a method similar to that of Example 2.
• Fig. 8 shows the activity of
• TLK286 (at 4.6 ⁇ M, about IC 25 ) and ⁇ t tximab (at concentrations between about 0.01 and 3 ⁇ g/mL, from nearly no effect to nearly maximum inliibition), and clearly iUustrates the beneficial effect of the combination.
• Example 9 TLK286 and gefitinib [0085] TLK286 and gefitinib were assayed in the human breast cancer ceU line MX-1, using a mediod sitrdlar to that of Example 2. Fig.
• TLK286 at an initial dose of 500 mg/m" body surface area was administered intravenously, foHowed 30 minutes later by the intravenous administration of docetaxel at 75 mg/m 2 .
• the TLK286 dose was increased to 750 mg/m 2 and further to 960 mg/m 2 .
• TLK286 At 500 mg/m 2 , three at 750 mg/m", and fourteen at 960 mg/m 2 , in each case foHowed by 75 mg/m 2 docetaxel.
• 14 patients at the 960 mg/m 2 TLK286 dose 4 have shown a partial response, and 5 have shown stable disease, using RECIST (Response Evaluation Criteria in SoHd Tumors) criteria; while aU 3 patients at 750 mg/m 2 and 1 patient at 500 mg/m 2 TLK286 have shown stable disease.
• the study is ongoing, with administration of the drugs at 3-weekly intervals, and clearly iHustrates the beneficial effect of the combination.
• Example 11 Combination therapy witii TLK286 and carboplatin in ovarian carcinoma
• Example 12 Combination therapy with TLK286 and Hposomal doxorubicin in ovarian carcinoma
• 17 patients with metastatic ovarian carcinoma were enroHed in a clinical study, and 13 patients were evaluable for interim analysis. Of the 13 patients, aH were resistant or refractory to platinum anticancer compounds, 9 were resistant or refractory to pacHtaxel, and many had failed to respond to odier chemotherapies (the median number of prior chemotherapeutic regimens was two).
• TLK286 at an initial dose of 500 mg/m 2 body surface area was administered intravenously, foHowed 30 minutes later by the intravenous administration of Hposomal doxorubicin at 40 mg/m".
• the TLK286 dose was increased to 750 mg/m 2 and further to 960 mg/m 2 , and the Hposomal doxorubicin dose was increased to 50 mg/m 2 .
• 3 have received TLK286 at 500 mg/m 2
• 3 at 750- mg/m 2 and 4 at 960 mg/m 2 , in each case foHowed by 40 mg/m 2 Hposomal doxorubicin
• 7 patients have received TLK286 at 960 mg/m 2 foHowed by 50 mg/m 2 Hposomal doxorubicin.
• TLK286 at an initial dose of 500 mg/m 2 is administered intravenously, foHowed 30 minutes later by the intravenous administration of oxaHplatin at a therapeutically effective dose such as 85 mg/m 2 .
• the TLK286 dose may be increased to 850 rng/m 2 and further to
• TLK286 at an initial dose of 500 mg/m 2 is administered intravenously at 3-weekly intervals, accompanied by the oral administration of capecitabine at a tiierapeuticaUy effective, dose such as 1250 mg/m 2 twice/day for 14 days, foHowed by 7 days without treatment.
• the TLK286 dose may be increased to 750 mg/m 2 and further to 960 mg/m 2 , and the capecitabine dose may also be varied.
• TLK286 at an initial dose of 400 mg/m 2 is administered intravenously at 2-weekly intervals, foHowed 30 minutes later by the intravenous administration of fluorouracH at a tiierapeuticaUy effective dose such as 12 mg/Kg, with leucovorin rescue after completion of four days of fluorouracH therapy.
• the TLK286 dose may be increased to 700 mg/m 2 and further to 1000 mg/m 2 , and the fluorouracH dose may also be varied.
• GST-activated anticancer compounds may be used simUarly in the method of this invention.
• Different other anticancer therapies such as other chemotiierapies, molecularly targeted therapies, biologic therapies, and radiation therapies may also be used simUarly in the method of this invention;

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