AU2003265737B2 - Combination chemotherapy compositions and methods - Google Patents
Combination chemotherapy compositions and methods Download PDFInfo
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- AU2003265737B2 AU2003265737B2 AU2003265737A AU2003265737A AU2003265737B2 AU 2003265737 B2 AU2003265737 B2 AU 2003265737B2 AU 2003265737 A AU2003265737 A AU 2003265737A AU 2003265737 A AU2003265737 A AU 2003265737A AU 2003265737 B2 AU2003265737 B2 AU 2003265737B2
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- alkyl
- hydrogen
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- rio
- cancer
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- 229960004618 prednisone Drugs 0.000 description 1
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 1
- FYPMFJGVHOHGLL-UHFFFAOYSA-N probucol Chemical compound C=1C(C(C)(C)C)=C(O)C(C(C)(C)C)=CC=1SC(C)(C)SC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 FYPMFJGVHOHGLL-UHFFFAOYSA-N 0.000 description 1
- 229960003912 probucol Drugs 0.000 description 1
- CPTBDICYNRMXFX-UHFFFAOYSA-N procarbazine Chemical compound CNNCC1=CC=C(C(=O)NC(C)C)C=C1 CPTBDICYNRMXFX-UHFFFAOYSA-N 0.000 description 1
- 229960000624 procarbazine Drugs 0.000 description 1
- 239000000583 progesterone congener Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 230000000069 prophylactic effect Effects 0.000 description 1
- AQHHHDLHHXJYJD-UHFFFAOYSA-N propranolol Chemical compound C1=CC=C2C(OCC(O)CNC(C)C)=CC=CC2=C1 AQHHHDLHHXJYJD-UHFFFAOYSA-N 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 210000002307 prostate Anatomy 0.000 description 1
- 238000001243 protein synthesis Methods 0.000 description 1
- 239000000649 purine antagonist Substances 0.000 description 1
- 125000004309 pyranyl group Chemical group O1C(C=CC=C1)* 0.000 description 1
- 239000003790 pyrimidine antagonist Substances 0.000 description 1
- 150000003230 pyrimidines Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 235000013526 red clover Nutrition 0.000 description 1
- 208000016691 refractory malignant neoplasm Diseases 0.000 description 1
- 230000031539 regulation of cell division Effects 0.000 description 1
- 239000003488 releasing hormone Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000008263 repair mechanism Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 238000002390 rotary evaporation Methods 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 231100000161 signs of toxicity Toxicity 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000003007 single stranded DNA break Effects 0.000 description 1
- 239000002884 skin cream Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 230000037439 somatic mutation Effects 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 150000003431 steroids Chemical class 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 229960001052 streptozocin Drugs 0.000 description 1
- ZSJLQEPLLKMAKR-GKHCUFPYSA-N streptozocin Chemical compound O=NN(C)C(=O)N[C@H]1[C@@H](O)O[C@H](CO)[C@@H](O)[C@@H]1O ZSJLQEPLLKMAKR-GKHCUFPYSA-N 0.000 description 1
- 229960000894 sulindac Drugs 0.000 description 1
- MLKXDPUZXIRXEP-MFOYZWKCSA-N sulindac Chemical compound CC1=C(CC(O)=O)C2=CC(F)=CC=C2\C1=C/C1=CC=C(S(C)=O)C=C1 MLKXDPUZXIRXEP-MFOYZWKCSA-N 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000000829 suppository Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 239000012747 synergistic agent Substances 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 229960001603 tamoxifen Drugs 0.000 description 1
- 230000002381 testicular Effects 0.000 description 1
- 210000001550 testis Anatomy 0.000 description 1
- 229960003604 testosterone Drugs 0.000 description 1
- 229960001712 testosterone propionate Drugs 0.000 description 1
- 235000019364 tetracycline Nutrition 0.000 description 1
- 150000003522 tetracyclines Chemical class 0.000 description 1
- 229940040944 tetracyclines Drugs 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 229960001196 thiotepa Drugs 0.000 description 1
- 229960003087 tioguanine Drugs 0.000 description 1
- 238000011200 topical administration Methods 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 239000000196 tragacanth Substances 0.000 description 1
- 235000010487 tragacanth Nutrition 0.000 description 1
- 229940116362 tragacanth Drugs 0.000 description 1
- 230000014616 translation Effects 0.000 description 1
- NOYPYLRCIDNJJB-UHFFFAOYSA-N trimetrexate Chemical compound COC1=C(OC)C(OC)=CC(NCC=2C(=C3C(N)=NC(N)=NC3=CC=2)C)=C1 NOYPYLRCIDNJJB-UHFFFAOYSA-N 0.000 description 1
- 229960001099 trimetrexate Drugs 0.000 description 1
- 239000001226 triphosphate Substances 0.000 description 1
- 235000011178 triphosphate Nutrition 0.000 description 1
- 125000002264 triphosphate group Chemical class [H]OP(=O)(O[H])OP(=O)(O[H])OP(=O)(O[H])O* 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- 229960001055 uracil mustard Drugs 0.000 description 1
- 208000010570 urinary bladder carcinoma Diseases 0.000 description 1
- 210000004291 uterus Anatomy 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
- 229960001722 verapamil Drugs 0.000 description 1
- 229960003048 vinblastine Drugs 0.000 description 1
- JXLYSJRDGCGARV-XQKSVPLYSA-N vincaleukoblastine Chemical compound C([C@@H](C[C@]1(C(=O)OC)C=2C(=CC3=C([C@]45[C@H]([C@@]([C@H](OC(C)=O)[C@]6(CC)C=CCN([C@H]56)CC4)(O)C(=O)OC)N3C)C=2)OC)C[C@@](C2)(O)CC)N2CCC2=C1NC1=CC=CC=C21 JXLYSJRDGCGARV-XQKSVPLYSA-N 0.000 description 1
- OGWKCGZFUXNPDA-XQKSVPLYSA-N vincristine Chemical compound C([N@]1C[C@@H](C[C@]2(C(=O)OC)C=3C(=CC4=C([C@]56[C@H]([C@@]([C@H](OC(C)=O)[C@]7(CC)C=CCN([C@H]67)CC5)(O)C(=O)OC)N4C=O)C=3)OC)C[C@@](C1)(O)CC)CC1=C2NC2=CC=CC=C12 OGWKCGZFUXNPDA-XQKSVPLYSA-N 0.000 description 1
- 229960004528 vincristine Drugs 0.000 description 1
- OGWKCGZFUXNPDA-UHFFFAOYSA-N vincristine Natural products C1C(CC)(O)CC(CC2(C(=O)OC)C=3C(=CC4=C(C56C(C(C(OC(C)=O)C7(CC)C=CCN(C67)CC5)(O)C(=O)OC)N4C=O)C=3)OC)CN1CCC1=C2NC2=CC=CC=C12 OGWKCGZFUXNPDA-UHFFFAOYSA-N 0.000 description 1
- 239000007762 w/o emulsion Substances 0.000 description 1
- PJVWKTKQMONHTI-UHFFFAOYSA-N warfarin Chemical compound OC=1C2=CC=CC=C2OC(=O)C=1C(CC(=O)C)C1=CC=CC=C1 PJVWKTKQMONHTI-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Landscapes
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Description
WO 2004/030662 PCT/AU2003/001296 -1- COMBINATION CHEMOTHERAPY COMPOSITIONS AND METHODS Field of the Invention This invention relates to combination therapies involving anticancer chemotherapeutic agents and isoflavones or analogues thereof. The invention further relates to compounds, compositions, methods and therapeutic uses involving, containing, comprising, including and/or for preparing platinum-isoflavonoid complexes suitable for use in the combination therapies of the invention.
Background The regulation of cell division (mitosis) is of critical importance to the normal growth and development of a multicellular organism, as well as the homeostatic maintenance of tissues, and the ability of certain cell types to respond appropriately to environmental cues.
Loss of control of normal cell proliferation rate occurs when the "checkpoints" of cell division fail to function normally. This occurs when normal cells acquire basic genetic damage through somatic mutations to key regulatory genes or through genetic inheritance, thus becoming "initiated" cells. The genetic abnormalities in initiated cells lead to altered gene expression and altered cell behaviour.
The initiated cells may undergo clonal expansion and act as a site for additional genetic alteration. Cell proliferation acts to push clonal expansion. Should further genetic damage occur, the initiated cells can eventually accumulate sufficient genetic damage to cell-cycle regulatory genes to form neoplastic cells, resulting in a neoplastic cell mass or neoplasm.
Neoplasms are generally classified as benign or malignant. Benign tumours proliferate locally and are composed of differentiated cells resembling those of the tissue of origin, the edge of the tumour remaining well defined, and usually encapsulated. Malignant neoplasms (classically termed "cancers") are not encapsulated and their edges are ill- WO 2004/030662 PCT/AU2003/001296 -2defined, the cells are also less well differentiated than the cells of origin, and show increased mitotic activity.
Localised, chronic irritation or inflammation can also cause cells to divide abnormally, resulting in abnormal growths or cellular masses, or tumours. Reactive cellular growth responses to clearly defined, chronic irritant stimulation are described as metaplasias. In dysplasias, there is a disorganisation of the pattern of squamous epithelium in tissues such as the skin, oesophagus and uterus in response to chronic irritation or inflammation.
Numerous compounds are commercially available as chemotherapeutic agents for destruction of abnormally proliferating cells in benign and malignant neoplasias, dyplasias and metaplasias. Predicting the responsiveness of a given tumour-related disease type to a particular drug is difficult, as each disease type is different and may respond to different treatments. Generally, clinical treatment of cancer and other cellular proliferative disorders involves having different chemotherapy treatment options for each condition.
An example of an important chemotherapeutic agent is the platinum-based compound cisplatin (cis-diamminedichloroplatinum cis-C1 2
(NH
3 Cisplatin has a square planar geometry, with each of the two chloride groups (and likewise, each of the two amine groups) being adjacent, or cis, to each other.
Cisplatin was first approved for human use in the late 1970's and is prescribed for the treatment of a variety of tumours including germ-cell, advanced bladder carcinoma, adrenal cortex carcinoma, breast, testicular and ovarian cancer, head and neck carcinoma and lung carcinoma.
Cisplatin is active against proliferating or cancerous cells by binding to DNA and interfering with its repair mechanism, eventually leading to cell death. It is thought that the first step in the cellular process is that a molecule of water replaces one of the chloride ions of cisplatin. The resulting intermediate structure can then bind to a single nitrogen on WO 2004/030662 PCT/AU2003/001296 -3a DNA nucleotide. Following that, the second chloride is also replaced by another water molecule and the platinum agent then binds to a second nucleotide. Binding studies of cisplatin with DNA have indicated a preference for nitrogen 7 on two adjacent guanines on the same strand. It also binds to adenine and across strands to a lesser extent.
The binding of cisplatin to DNA causes production of intrastrand cross-links and formation of DNA adducts. The adducts or cisplatin-DNA complexes attract the attention of DNA repair proteins which become irreversibly bound. The resulting distortion to the shape of the DNA by the binding of cisplatin prevents effective repair and hence, cell death.
Other well known chemotherapeutic agents include carboplatin, the taxanes such as paclitaxel, gemcitabine, 5-fluorouracil, methotrexate and the tetracyclines.
Patients undergoing cancer chemotherapy often have to contend with quite severe and debilitating side effects due to the toxicity of the active agents. Common side effects of chemotherapy are nausea and vomiting. Other side effects include temporary reduction in bone marrow function, numbness or tingling in hands or feet, changes in hearing, temporary taste alterations, loss of appetite, diarrhoea and allergic reactions.
Chemotherapy regimes are further complicated by the efficacy of currently available chemotherapeutic agents against various cancers or other tumour types sometimes being insufficient. For example, some cancer cells have developed natural tolerance against the therapeutic agents. Further, some therapeutic or prophylactic agents exert side effects, or can induce the development of tolerance in abnormally dividing cells during clinical use, leading to a situation in which certain tumour types become multiply drug resistant.
Multidrug resistance thus remains a main complication of long-term successful tumour chemotherapy.
Accordingly there is a strong need to identify new, improved, better and/or alternative P.\WPDOCSW4DTISpMcs22691 dm.29/f2OO8 00 S-4pharmaceutical compositions, agents and treatment regimes against chemosensitivity, O mutated growth or proliferation of cells including cancer and related diseases. There is a further need for chemotherapeutic agents which address some of the undesirable side effects of known agents. There is also a need for different therapies to be available to 5 physicians to combat the numerous and various types of cancers and to provide new INO options for treatment to address issues of tolerance of proliferating cells to the existing chemotherapeutic agents and treatment regimes. Agents which can act synergistically with Sother chemotherapeutics are highly sought after. Any beneficial effects which can be obtained with synergistic agents can reduce the amount and duration of traditional 0o chemotherapeutic drugs or improve or restore chemoselectivity thereby providing safer administration and hopefully fewer or less severe side effects.
An object of the present invention is to provide pharmaceutical compositions and methods for the treatment, amelioration or prophylaxis of cancer and diseases associated with oxidant stress. The present invention also seeks to provide pharmaceutical compositions and methods for targeting neoplastic cells for treatment, which compositions and methods provide improved cell activity in terms of targeting function, improved delivery of toxic agents and/or improvement or restoration of chemosensitivity.
Summary of the Invention This application now describes new treatment regimes and chemotherapeutic compositions and compounds. The invention is based on the totally unexpected activity of isoflavonoid compounds in restoring or addressing the chemoselectivity or activity of anticancer agents, synergistic compositions including same and novel isoflavonoid-drug complexes.
In a first aspect, the present invention provides a method of increasing the sensitivity of cancer cells or a tumour to a chemotherapeutic agent by contacting said cells or tumour with an isoflavonoid compound of the formula: P AWPDOCSVAD7%Spms2228691 do.Z29/9Y0m8 00
O
W W O Ri 6, 0 R 6 RI, R6 (VI)
Z
R
15 Z
R
Z Z
R
2 OH R14 R 2 R14 R14 R14
IN
W W o SRIO R 6 (VII) R OH Rs (IX) R 1 R2 R2 R14 in which
R
1
R
2 and Z are independently hydrogen, hydroxy, OR 9 OC(O)Rio, OS(O)Rio, CHO,
C(O)R
0 o, COOH, C0 2 Rio, CONR 3 R4, alkyl, haloalkyl, arylalkyl, alkenyl, alkynyl, aryl, heteroaryl, alkylaryl, alkoxyaryl, thio, alkylthio, amino, alkylamino, dialkylamino, nitro or halo, or
R
2 is as previously defined, and R 1 and Z taken together with the carbon atoms to which they are attached form a five-membered ring selected from T O O o T,>0 ,or T O O RI is as previously defined, and R 2 and Z taken together with the carbon atoms to which they are attached form a five-membered ring selected from 0 0 T 0 P:\WPDOCS\MDTNSpc s\2228691 doc.29/9/2008 00
O
SW is Ri, Swherein:
R
3 is hydrogen, alkyl, arylalkyl, alkenyl, aryl, an amino acid, C(O)RII where RI, is hydrogen, alkyl, aryl, arylalkyl or an amino acid, or CO 2
R
2 where RI2 is hydrogen, alkyl, s haloalkyl, aryl or arylalkyl, N R 4 is hydrogen, alkyl or aryl, or
R
3 and R 4 taken together with the nitrogen to which they are attached comprise pyrrolidinyl or piperidinyl,
R
5 is hydrogen, C(O)RI, where R 11 is as previously defined, or CO 2
R
12 where R 12 is as io previously defined,
R
6 is hydrogen, hydroxy, alkyl, aryl, amino, thio, NR 3 R4, CORii where R 1 is as previously defined, CO 2
R
2 where R 1 2 is as previously defined or CONR 3 R4,
R
9 is alkyl, haloalkyl, aryl, arylalkyl, C(O)RII where R 11 is as previously defined, or Si(Ri 3 3 where Ri 3 is independently hydrogen, alkyl or aryl.
Rio is hydrogen, alkyl, haloalkyl, amino, aryl, arylalkyl, an amino acid, alkylamino or dialkylamino, the drawing represents either a single bond or a double bond, T is independently hydrogen, alkyl or aryl,
R
1 4 and R 15 are independently hydrogen, hydroxy, OR 9 OC(O)Rio, OS(O)Rio, CHO, C(O)Rio, COOH, C0 2 Rio, CONR 3
R
4 alkyl, haloalkyl, arylalkyl, alkenyl, alkynyl, aryl, heteroaryl, thio, alkylthio, amino, thioalkyl, alkylamino, dialkylamino, nitro or halo, or
R
1 4 and Ris are fused together to form a cyclic alkyl aromatic or heteroaromatic structure, and pharmaceutically acceptable salts thereof.
In a second aspect, the present invention provides a method for the treatment, prophylaxis, amelioration, defence against and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress, which method includes the step of administering a compound of formula (VIa), (VII) or as defined in the first aspect and a chemotherapeutic agent.
In a third aspect, the present invention provides use of a compound of formula (VI), (VIa), (VII) or (IX) as defined in the first aspect, and a chemotherapeutic agent, in the P :WPDOCS\MDTSpc\l 2228691 doc-2909/2008 00
O
0
(N
Cc tq
CO
0 In t'D
(N
t' tm 0' 0
(N
manufacture of a medicament for the treatment of cancer or a disease associated with antioxidant stress.
In a fourth aspect, the present invention provides use of a compound selected from the following:
F
(VII) R1.
Z'
(VI)
4
(IX)
in which Ri, R 2 and Z are independently hydrogen, hydroxy, OR 9 OC(O)Rlo, OS(O)Rio, CHO, C(O)Rio, COOH, C0 2 Rio, CONR 3
R
4 alkyl, haloalkyl, arylalkyl, alkenyl, alkynyl, aryl, heteroaryl, alkylaryl, alkoxyaryl, thio, alkylthio, amino, alkylamino, dialkylamino, nitro or halo, or
R
2 is as previously defined, and Ri and Z taken together with the carbon atoms to which they are attached form a five-membered ring selected from
TXO
0 0: RI is as previously defined, and R 2 and Z taken together with the carbon atoms to which they are attached form a five-membered ring selected from P.%WPDOCSVADT1Specs12228691 dc29An/2M 8 00 0 NeO T 0
O
T O IW is Ri, C wherein:
SR
3 is hydrogen, alkyl, arylalkyl, alkenyl, aryl, an amino acid, C(O)RI, where RII is C 5 hydrogen, alkyl, aryl, arylalkyl or an amino acid, or C0 2 RI2 where R 12 is hydrogen, alkyl, haloalkyl, aryl or arylalkyl, R4 is hydrogen, alkyl or aryl, or
R
3 and R4 taken together with the nitrogen to which they are attached comprise pyrrolidinyl or piperidinyl, to Rs is hydrogen, C(0)RII where RIn is as previously defined, or C0 2
RI
2 where Ri2 is as previously defined, R6 is hydrogen, hydroxy, alkyl, aryl, amino, thio, NR 3
R
4 CORII where RII is as previously defined, C0 2
R
2 where R 1 2 is as previously defined or CONR 3
R
4
R
9 is alkyl, haloalkyl, aryl, arylalkyl, C(O)RII where RI 1 is as previously defined, or Si(R 1 3 3 where Ri3 is independently hydrogen, alkyl or aryl.
Rio is hydrogen, alkyl, haloalkyl, amino, aryl, arylalkyl, an amino acid, alkylamino or dialkylamino, the drawing represents either a single bond or a double bond, T is independently hydrogen, alkyl or aryl, RI4 and Ri5 are independently hydrogen, hydroxy, OR 9 OC(O)Rio, OS(O)Rio, CHO, C(O)Rio, COOH, C0 2 Rio, CONR 3 R4, alkyl, haloalkyl, arylalkyl, alkenyl, alkynyl, aryl, heteroaryl, thio, alkylthio, amino, thioalkyl, alkylamino, dialkylamino, nitro or halo, or R14 and Ril are fused together to form a cyclic alkyl aromatic or heteroaromatic strutcure, and pharmaceutically acceptable salts thereof, in the manufacture of a medicament for increasing the sensitivity of cancer cells or a tumour to a chemotherapeutic agent.
In a fifth aspect, the present invention provides use of a compound of formula (VI), (VIa), (VII) or (IX) as defined in the first aspect, and a chemotherapeutic agent, in the P.\WPDOCS\MDTSpcc\12228691 doc-29/09/2008 00 0 (r manufacture of a medicament for the treatment, prophylaxis, amelioration, defence against and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress.
In a sixth aspect, the present invention provides a pharmaceutical composition comprising
C
c a compound of formula (VIa), (VII) or (IX) as defined in the first aspect, and a t) s chemotherapeutic agent.
(N
In a seventh aspect, the present invention provides a platinum complex or analogue thereof of the general formula (II):
RA
I
RD-Pt-RB
(II)
I
Rc in which to RA, RB, RC, and RD are independently halo, hydroxy, XRE, alkoxy, OC(O)RF, OS(O)RF, thio, alkylthio, amino, alkylamino or dialkylamino, X is O, NRF or S, and RF is hydrogen, alkyl, arylalkyl, alkenyl, aryl or an amino acid, wherein at least one of RA, RB, Rc, and RD is XRE where RE is a compound represented by the general formula (VIa), (VII) or (IX) as defined in the first aspect, or is derived from or is a radical or ion of the compound of formula (VIa), (VII) or (IX) as defined in the first aspect, and ligates to the platinum through any one or more of the oxygen heteroatoms, or a radical of the heteroatoms defined as part of RE or alternatively by a double bond on the compound of formula (VIa), (VII) or (IX), and when RA is XRE, RB, Rc and/or RD together may form part of a bidentate or tridentate ligand of general formula and respectively P.%WPDOCS DTISP=l 22691 dmc-29AY92/ 00 0
L
O R6 R6 R6- SR6 R6 (CH 2 )n L L L L I
(T)
O wherein L represents a ligating atom chosen from N, O arid S, C n is from 0 to 8, and each R 6 is as defined in the first aspect, or may together form part of a cyclic alkyl, aromatic or heteroaromatic structure, which platinum complexes include pharmaceutically acceptable salts thereof.
In an eighth aspect, the present invention provides use of one or more platinum complexes of the formula as defined in the seventh aspect, in the manufacture of a medicament to for the treatment, amelioration, defence against, prophylaxis and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress.
In a ninth aspect, the present invention provides a method for the treatment, prophylaxis, amelioration, defence against and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress which method comprises administering to a subject a is therapeutically effective amount of one or more platinum complexes of the formula (II) as defined in the seventh aspect.
In a tenth aspect, the present invention provides a pharmaceutical composition comprising one or more platinum complexes of the formula (II) as defined in the seventh aspect, in association with one or more pharmaceutical carriers and/or excipients.
In an eleventh aspect, the present invention provides a composition comprising a platinum complex of the general formula (IIa), P AWPDOCS.D1%SpcM 222869I dom-29AJWfm8 00 C/ RG 0
I
RRJ-PI- RH (lla)
I
t- Rl Sin which RG, RH, RI, and Rj are independently halo, hydroxy, alkoxy, OC(O)RK, OS(O)RK thio, O alkylthio, amino, alkylamino or dialkylamino, s X is O, NRK or S, and RK is hydrogen, alkyl, arylalkyl, alkenyl, aryl or an amino acid, in association with a compound of the general formula (VIa), (VII) or as defined in the first aspect, and pharmaceutically acceptable salts thereof.
In a twelfth aspect, the present invention provides use of a platinum complex of the to formula (IIa), as defined in an eleventh aspect and a compound of the formula (VI), (VIa), (VII) or as defined in the first aspect, in the manufacture of a medicament for the treatment, amelioration, defence against, prophylaxis and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress.
In a thirteenth aspect, the present invention provides use of a compound of the formula is (VIa), (VII) or as defined in the first aspect and a chemotherapeutic agent, in the manufacture of a medicament for the treatment, prophylaxis, amelioration, defence against and/or prevention of sunlight induced skin damage.
In a fourteenth aspect, the present invention provides a method for the treatment, prophylaxis, amelioration, defence against and/or prevention of sunlight induced skin damage said method comprising administering to a subject a therapeutically effective amount of a compound of the formula (VIa), (VII) or as defined in the first aspect and a chemotherapeutic agent.
In a fifteenth aspect, the present invention provides a method for the treatment, amelioration, defence against prophylaxis and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress which comprises administering to a subject a 00
O
0 q c^ 0€ P:\WPDOCS\MDTSpecs\l12228691 doc-29 92008 therapeutically effective amount of a platinum complex of the formula (IIa), as defined in the eleventh aspect and a compound of the formula (VIa), (VII) or (IX) as defined in the first aspect.
Disclosed herein is a method of increasing the sensitivity of cancer cells or a tumour to a chemotherapeutic agent by contacting said cells or tumour with an isoflavonoid compound of formula (Ia) as set out below.
Compounds of the general formula are the isoflavonoid compounds represented by the formula:
W
R, A in which Ri, R 2 and Z are independently hydrogen, hydroxy, OR 9
OC(O)R
0 o, OS(O)Rio, CHO, C(O)Rio, COOH, C0 2
R
1 0
CONR
3
R
4 alkyl, haloalkyl, arylalkyl, alkenyl, alkynyl, aryl, heteroaryl, alkylaryl, alkoxyaryl, thio, alkylthio, amino, alkylamino, dialkylamino, nitro or halo, or
R
2 is as previously defined, and R 1 and Z taken together with the carbon atoms to which they are attached form a five-membered ring selected from T
O
TO
0 0 RI is as previously defined, and R 2 and Z taken together with the carbon atoms to which they are attached form a five-membered ring selected from P 9WPDOCSIIDTSpccsI2228691 doc-291DW2lC98 00 Tl0 0 T 0 and W is III, A is hydrogen, hydroxyl, NR 3
R
4 or thio, and B is selected from WO 2004/030662 PCT/AU2003/001296 -6-
R
Y
W is R 1 and A and B taken together with the carbon atoms to which they are attached form a six-membered ring selected from X R 6 R7 X R 6
Y
O
X R 6
OR
7 X R 6 R7
OR
7 X R6
Y
0 W, A and B taken together with the groups to which they are associated are selected from R8
R
1 N R 6 Z Y
R
2
O
R6 or W and A taken together with the groups to which they are associated are selected from WO 2004/030662 PCT/AU2003/001296 -7- Rg R8 R8 1, NR 10 R NRIo R 1
NR
10 ZZ B Z B Z B R2 R2 R2 and B is selected from R5 R Y Y O O wherein
R
3 is hydrogen, alkyl, arylalkyl, alkenyl, aryl, an amino acid, C(O)R 1 1 where Rn 1 is hydrogen, alkyl, aryl, arylalkyl or an amino acid, or C0 2
R
1 2 where R12 is hydrogen, alkyl, haloalkyl, aryl or arylalkyl,
R
4 is hydrogen, alkyl or aryl, or
R
3 and R 4 taken together with the nitrogen to which they are attached comprise pyrrolidinyl or piperidinyl,
R
5 is hydrogen, C(O)R 1 1 where R 11 is as previously defined, or CO 2 Ri2 where R 1 2 is as previously defined,
R
6 is hydrogen, hydroxy, alkyl, aryl, amino, thio, NR 3
R
4
COR
1 1 where R 1 I is as previously defined, C0 2
R
12 where R 12 is as previously defined or CONR 3 R4, R7 is hydrogen, C(O)R 1 1 where Rn is as previously defined, alkyl, haloalkyl, alkenyl, aryl, arylalkyl or Si(R 13 3 where each R 13 is independently hydrogen, alkyl or aryl, R8 is hydrogen, hydroxy, alkoxy or alkyl, R9 is alkyl, haloalkyl, aryl, arylalkyl, C(0)R 1 1 where R11 is as previously defined, or Si(R 3 3 where R13 is as previously defined, WO 2004/030662 PCT/AU2003/001296 -8-
R
1 o is hydrogen, alkyl, haloalkyl, amino, aryl, arylalkyl, an amino acid, alkylamino or dialkylamino, the drawing represents either a single bond or a double bond, T is independently hydrogen, alkyl or aryl, X is O, NR 4 or S, and Y is
R
16 RR14 wherein
R
14
R
1 5 and R 16 are independently hydrogen, hydroxy, OR 9 OC(O)Rio, OS(O)Rio, CHO, C(O)Rio, COOH, C0 2 Rio, CONR 3
R
4 alkyl, haloalkyl, arylalkyl, alkenyl, alkynyl, aryl, heteroaryl, thio, alkylthio, amino, alkylamino, dialkylamino, nitro or halo, or any two of R 1 4
R
15 and R 1 6 are fused together to form a cyclic alkyl, aromatic or heteroaromatic structure, and pharmaceutically acceptable salts thereof.
In a preferred embodiment the cancer cells or tumour are pre-treated with a compound of formula prior to treatment with the chemotherapeutic agent.
In another embodiment, the compound of formula is administered concurrently with the chemotherapeutic agent.
In a further embodiment the compound of formula is administered after resistance to a chemotherapeutic agent is observed in cancer cells and tumours, and in particular after multidrug resistance is observed.
In a further embodiment the sensitivity of the cancer cells or tumour to the chemotherapeutic agent is restored or regenerated.
WO 2004/030662 PCT/AU2003/001296 -9- According to another aspect there is provided a combination therapy comprising administering to a subject a therapeutically effective amount of a compound of formula (I) and a chemotherapeutic agent.
The combination therapy is for the treatment, prophylaxis, amelioration, defence against and/or prevention of cell proliferation and cancers including benign prostatic hypertrophy; breast cancer; uterine cancer; ovarian cancer; testicular cancer; large bowel cancer; endometrial cancer; prostatic cancer; uterine cancer; and diseases associated with oxidant stress including cancer, myocardial infarction stroke, arthritis, sunlight induced skin damage or cataracts (for convenience hereafter referred to as the "therapeutic indications").
In a preferred embodiment the administration of the compound of formula precedes the administration of the chemotherapeutic agent. Alternatively, the administration is concurrent. In a further embodiment the combination therapy follows observed resistance by cancer cells and tumours to a chemotherapeutic agent or agents.
In a preferred embodiment the subject cell growth is proliferation, and the subject downregulation is killing off the proliferating cells. The condition being treated is preferably cancer, more preferably a metastatic cancer selected from breast cancer, prostatic cancer, testicular cancer, ovarian cancer, uterine cancer and/or colorectal cancer, and more preferably is ovarian cancer, prostatic cancer or pancreatic cancer.
In further aspects of the invention there is provided methods for the manufacture of medicaments for the above stated methods of the invention and pharmaceutical agents useful for same.
This application also describes new therapeutic compositions and complexes comprising platinum-based pharmaceutical agents. The invention is based on the totally unexpected biological activity of new platinum-isoflavonoid complexes and ofisoflavonoid PAWPD0CS\MDrp-\%2Z869I d-.29/9f2O8 00 0 compounds of formula which form synergistic compositions or complexes with platinum-based chemotherapeutic agents.
The compositions and platinum-isoflavonoid complexes are important targeting agents for Sthe delivery of toxic signals to cells. The compositions and methods of the invention are t 5 directed to treating a condition in a subject, which condition is characterised by the undesirable, detrimental or otherwise unwanted growth or proliferation of cells.
C, Also disclosed herein are platinum-isoflavonoid complexes and analogues thereof described by general formula (II):
RA
I
RD- Pt RB
I
Rc (II) io in which RA, RB, Rc, and RD are independently halo, hydroxy, XRE, alkoxy, OC(O)RF, OS(O)RF, thio, alkylthio, amino, alkylamino or dialkylamino, X is O, NRF or S, and RF is hydrogen, alkyl, arylalkyl, alkenyl, aryl or an amino acid, wherein at least one of RA, RB, Rc, and RD, and preferably only RA, is XRE where RE is an isoflavonoid compound represented by general formula set out above or is derived from or is a radical or ion of the isoflavonoid compound and ligates to the platinum through any one or more of the heteroatoms X or a radical of the heteroatoms defined as part of RE or alternatively by a double bond on the isoflavonoid compound (I) and when RA is XRE, RB, Rc and/or RD together may form part of a bidentate or tridentate P \WPDOCS\MDTSpecs\l 2228691 doc-29/09/2008 00 0 -11-
C
ri ligand of general formulae and respectively
OL
R6 R6 R6-- SR6 R6 (CH 2 )n L L IN L L S(B) (T) wherein L represents a ligating atom chosen from N, O and S, n is from 0 to 8, and each R 6 is independently as defined above or may together form part of a cyclic alkyl, aromatic or heteroaromatic structure, which platinum-isoflavonoid complexes include pharmaceutically acceptable salts thereof.
It has also surprisingly been found by the inventors that platinum-isoflavonoid complexes of the general formula (II) have particular utility and effectiveness in the treatment, prophylaxis, amelioration defence against, and/or prevention of the therapeutic indications noted above.
Further disclosed herein is a method for the treatment, prophylaxis, amelioration, defence against, and/or prevention of the therapeutic indications described above which method comprises administering to a subject a therapeutically effective amount of one or more platinum-isoflavonoid complexes of the formula (II) as defined above.
Also disclosed herein is a method of treating a condition in a mammal, which condition is characterised by the undesirable, detrimental or otherwise unwanted growth of cells, said method comprising administering to said mammal an effective amount a platinumisoflavonoid complex of formula (II) for a time and under conditions sufficient to downregulate the growth of said cells.
In a preferred embodiment the subject cell growth is proliferation, and the subject down- P \WPDOCS\MDT1pc\12228691 doc-2909f/200 00 S-12regulation is killing of the proliferating cells. The condition being treated is preferably Scancer, more preferably a metastatic cancer selected from breast cancer, prostatic cancer, testicular cancer, ovarian cancer, uterine cancer and/or colorectal cancer, and more Spreferably is ovarian cancer, prostatic cancer or pancreatic cancer.
t) s Also disclosed herein is a method of down-regulating the growth of cells, said method comprising contacting said cells with an effective amount of a platinum-isoflavonoid Scomplex of formula (II).
In a preferred embodiment the subject cell growth is proliferation, and the subject downregulation is killing of the proliferating cells.
Further disclosed herein is the use of platinum-isoflavonoid complexes of the formula (II) for the manufacture of a medicament for the treatment, amelioration, defence against, prophylaxis and/or prevention of one or more of the therapeutic indications.
Still further disclosed herein is the use of one or more platinum-isoflavonoid complexes of the formula (II) in the treatment, amelioration, defence against, prophylaxis and/or prevention of one or more of the therapeutic indications.
Yet further disclosed herein is an agent for the treatment, prophylaxis, amelioration, defence against and/or treatment of the therapeutic indications which comprises one or more platinum-isoflavonoid complexes of the formula (II) either alone or in association with one or more carriers or excipients.
Also disclosed herein is a therapeutic composition which comprises one or more platinumisoflavonoid complexes of the formula (II) in association with one or more pharmaceutical carriers and/or excipients Still further disclosed herein is a drink or food-stuff, which contains one or more platinumisoflavonoid complexes of the formula (II).
Also disclosed herein are compositions comprising a platinum complex of the general formula (IIa), P \WPDOCSMD\Sp lI 2228691 dcx29A)U92O8 00 -13- MR t R K 0
I
c RJ-Pt-RH SR (IIa) V in which RG, RH, RI, and Rj are independently halo, hydroxy, alkoxy, OC(O)RK, OS(O)RK, thio, alkylthio, amino, alkylamino or dialkylamino, X is O, NRK or S, and RK is hydrogen, alkyl, arylalkyl, alkenyl, aryl or an amino acid, or a pharmaceutically acceptable salt thereof, and an isoflavonoid compound of general formula as defined above.
These compositions comprising a platinum complex of the formula (IIa) and an isoflavonoid compound of the formula are found to have particular utility, effectiveness and synergism in the treatment, prophylaxis, amelioration defence against, and/or prevention of the therapeutic indications set out above.
Thus also disclosed herein is a method for the treatment, prophylaxis, amelioration, defence against, and/or prevention of the therapeutic indications which comprises administering to a subject a therapeutically effective amount of compositions comprising a platinum complex of the formula (IIa) in conjunction with an isoflavonoid compound of formula Further disclosed herein is the combined use of a platinum complex of the formula (IIa) and an isoflavonoid compound of the formula in the manufacture of a medicament for the treatment, amelioration, defence against, prophylaxis and/or prevention of the therapeutic indications.
Still further disclosed herein is the use of a platinum complex of the formula (IIa) and an P:\WPDOCS\MDT1p\12228691 doc-2909/2008 00 0 -14- Sisoflavonoid compound of the formula in the treatment, amelioration, defence against, C prophylaxis and/or prevention of the therapeutic indications.
Yet further disclosed herein is a kit comprising a platinum complex of the formula (IIa) c and an isoflavonoid compound of the formula either alone or in association with one or more carriers or excipients.
(N
Also disclosed herein is an agent for the treatment, prophylaxis, amelioration, defence C against and/or treatment of the therapeutic indications which comprises a composition comprising a platinum complex of the formula (IIa) and an isoflavonoid compound of the formula either alone or in association with one or more carriers or excipients.
to Throughout this specification and the claims which follow, unless the text requires otherwise, the word "comprise", and variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
Brief Description of the Figures Is Figure 1 represents the cell viability of various cancer cell lines over different concentrations of carboplatin.
WO 2004/030662 PCT/AU2003/001296 Figure 2 represents the cell viability of various cancer cell lines over different concentrations ofpaclitaxel.
Figure 3 represents the cell viability of various cancer cell lines over different concentrations of carboplatin following dehydroequol pre-treatment.
Figure 4 represents the cell viability of various cancer cell lines over different concentrations ofpaclitaxel following dehydroequol pre-treatment.
Figure 5 represents a Western Blot analysis of carboplatin or paclitaxel treatment resistant ovarian cancer CP70 cells with and without dehydroequol pre-treatment.
Figure 6 represents tumour mass comparison of dehydrequol and cisplatin when delivered as single active agents or combination therapy with the 5% HPBCD vehicle control group.
Figure 7 represents tumour volume comparison of dehydrequol and cisplatin when delivered as single active agents or combination therapy with the 5% HPBCD vehicle control group.
Figure 8 represents a body weight comparison as an indicator of toxicity in each dehydroequol, cisplatin or combination treatment group in comparison with the HPBCD vehicle control.
Detailed Description of the Invention The terms "isoflavonoid", "isoflavonoid" and "isoflavone" as used herein are to be taken broadly to include ring-fused benzopyran molecules having a pendent phenyl group from the pyran ring based on a 1,2-diphenylpropane system. Thus, the classes of compounds generally referred to as isoflavones, isoflavenes, isoflavans, isoflavanones, isoflavanols and the like are generically referred to herein as isoflavones, isoflavone derivatives or isoflavonoid compounds.
WO 2004/030662 PCT/AU2003/001296 -16- The term "alkyl" is taken to mean both straight chain and branched chain alkyl groups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, secbutyl, tertiary butyl, and the like.
The alkyl group has 1 to 10 carbon atoms, preferably from 1 to 6 carbon atoms, more preferably methyl, ethyl propyl or isopropyl. The alkyl group may optionally be substituted by one or more of fluorine, chlorine, bromine, iodine, carboxyl, C 1
-C
4 alkoxycarbonyl, C 1 -C4-alkylamino-carbonyl, di-(CI-C4-alkyl)-amino-carbonyl, hydroxyl, Ci-C 4 -alkoxy, formyloxy, C1-C 4 -alkyl-carbonyloxy, Ci-C 4 -alkylthio, C 3
-C
6 -cycloalkyl or phenyl.
The term "aryl" is taken to include phenyl and naphthyl and may be optionally substituted by one or more Ci-C 4 -alkyl, hydroxy, Ci-C 4 -alkoxy, carbonyl, Ci-C 4 -alkoxycarbonyl, C 1 C4-alkylcarbonyloxy or halo.
The term "halo" is taken to include fluoro, chloro, bromo and iodo, preferably fluoro and chloro, more preferably fluoro. Reference to for example "haloalkyl" will include monohalogenated, dihalogenated and up to perhalogenated alkyl groups. Preferred haloalkyl groups are trifluoromethyl and pentafluoroethyl.
The term "pharmaceutically acceptable salt" refers to an organic or inorganic moiety that carries a charge and that can be administered in association with a pharmaceutical agent, for example, as a counter-cation or counter-anion in a salt. Pharmaceutically acceptable cations are known to those of skilled in the art, and include but are not limited to sodium, potassium, calcium, zinc and quaternary amine. Pharmaceutically acceptable anions are known to those of skill in the art, and include but are not limited to chloride, acetate, citrate, bicarbonate and carbonate.
The term "pharmaceutically acceptable derivative" or "prodrug" refers to a derivative of the active compound that upon administration to the recipient, is capable of providing WO 2004/030662 PCT/AU2003/001296 -17directly or indirectly, the parent compound or metabolite, or that exhibits activity itself.
Prodrugs are included within the scope of the present invention.
As used herein, the terms "treatment", "prophylaxis" or "prevention", "amelioration" and the like are to be considered in their broadest context. In particular, the term "treatment" does not necessarily imply that an animal is treated until total recovery. Accordingly, "treatment" includes amelioration of the symptoms or severity of a particular condition or preventing or otherwise reducing the risk of developing a particular condition.
Preferred isoflavonoid compounds of formula are selected from general formulae (III)and more preferably are selected from general formulae W W R 0 R (Vl R 1 O\ PR 6
(IV)
R1 5 CX R 1 R2 O R2 O R14 R14 W
W
R 1 jOv RB Ri O R6 (VI) WO 2004/030662 WO 204/00662PCTIAU2003/001296 18- 02 R14 (VII)R14 in which Ri, R 2 Rs, R 6
R
1 4
R
15 W and Z are as defined above, more preferably Ri, R 2
R
14
R
15 W and Z are independently hydrogen, hydroxy, OR 9
OC(O)R
10 C(O)Rjo, COOH, C0 2
R
10 alkyl, haloalkyl, arylalkyl, aryl, thio, alkylthio, amino, alkylamino, dialkylamino, nitro or halo,
R
5 is hydrogen, C(O)R 1 1 where RI 1 is hydrogen, alkyl, aryl, or an amino acid, or C0 2
R
12 where R12 is hydrogen, alkyl or aryl, 1 5 R 6 is hydrogen, hydroxy, alkyl, aryl, CORI 1 where R, is as previously defined, or C0 2
R
12 where R 12 is as previously defined,
R
9 is alkyl, haloalkyl, arylalkyl, or C(O)RI 1 where R, is as previously defined, and RIO is hydrogen, alkyl, amino, aryl, an amino acid, alkcylamino or dialkylamino, more preferably R, and R 14 are independently hydroxy, OR 9 OC(O)Rj 0 or halo, WO 2004/030662 PCT/AU2003/001296 -19-
R
2 Ri 5 W and Z are independently hydrogen, hydroxy, OR 9 OC(O)Rio, C(O)R 1 o, COOH, COzR 1 0 alkyl, haloalkyl, or halo,
R
5 is hydrogen, C(O)RI where R 11 is hydrogen or alkyl, or CO 2
R
12 where R 1 2 is hydrogen or alkyl,
R
6 is hydrogen or hydroxy,
R
9 is alkyl, arylalkyl or C(O)R 1 where R 1 1 is as previously defined, and Rio is hydrogen or alkyl, and more preferably RI and R 1 4 are independently hydroxy, methoxy, benzyloxy, acetyloxy or chloro,
R
2
R
15 W and Z are independently hydrogen, hydroxy, methoxy, benzyloxy, acetyloxy, methyl, trifluoromethyl or chloro,
R
5 is hydrogen or CO 2
RI
2 where R 1 2 is hydrogen or methyl, and Re is hydrogen.
Particularly preferred isoflavonoid compounds of formula are selected from: HO 0 H O O 0 O OH OMe 1 2 HO O HO 0 OH 0 OH 0 L/ OH OMe WO 2004/030662 WO 204/00662PCTIAU2003/001296 (cis) (trans) 8
OH
HO 0 *y
OH
OH
Me HO 0
OH
OH
13 WO 2004/030662 WO 204/00662PCTIAU2003/001296 -21- 16 17 18 19 WO 2004/030662 WO 204/00662PCTIAU2003/001296 22 0H 23 H 0 0 1 Me 0
OH
28 HO 0 Me
OH
In a further embodiment the preferred isoflavonoid compounds are the isoflav-3-ene and isoflavan compounds of general formula and more preferred are the 3-ene compounds of the general formula (VIa): WO 2004/030662 WO 204/00662PCTIAU2003/001296 23 (Via) in which Ri, R 2
R
6
R
14
R
15 W and Z are as defined above; more preferably Ri, R 2
R
1 4
R
15 W and Z are independently hydrogen, hydroxy, OR 9
OC(O)R
1
C(O)RI
0 COOH, C0 2
R
10 alkyl, haloalkyl, arylalkyl, aryl, thio, alkylthio, amino, alkylainino, dialkylarnino, nitro or hialo,
R
6 is hydrogen, hydroxy, alkyl, aryl, C ORI 1 I where R, I is as previously defined, or C0 2
RI
2 where R 12 is as previously defined,
R
9 is alkyl, halo alkyl, arylalkyl, or C(O)Ri 1 where R, is as previously defined, and RIO is hydrogen, alkyl, amino, aryl, an amino acid, alkylamino or dialkylamino, more preferably Ri is hydroxy, OR 9
OC(O)R
10 or halo,
R
2
R
14
R
1 5 W and Z are independently hydrogen, hydroxy, OR 9
OC(O)RI
0
C(O)R
10 COOH, C0 2 RjO, alkyl, haloalkyl, or halo,
R
6 is hydrogen,
R
9 is alkyl, arylalkyl or C(O)R 1 where R 11 is as previously defined, and Rio is hydrogen or alkyl, and more preferably Ri is hydroxy, methoxy, benzyloxy, acetyloxy or chioro,
R
2
R
14
R
15 W and Z are independently hydrogen, hydroxy, methoxy, benzyloxy, acetyloxy, methyl, trifluoromethyl or chioro, and WO 2004/030662 PCT/AU2003/001296 -24-
R
6 is hydrogen, including pharmaceutically acceptable salts and derivatives thereof.
In a most preferred embodiment of the invention the isoflavonoid compound is dehydroequol, Cpd. 12. As such, particular reference is made to dehydroequol in the description, Examples which follow and accompanying drawings however this is not to be taken as being unmecessarily limiting on the disclosure of the invention provided herein.
Chemotherapeutic agents are generally grouped as DNA-interactive agents, antimetabolites, tubulin-interactive agents, hormonal agents, other agents such as asparaginase or hydroxyurea. Each of the groups of chemotherapeutic agents can be further divided by type of activity or compound. Chemotherapeutic agents used in combination with the isoflavonoid compound of fromula of the present invention, or salts thereof of the present invention, may be selected from any of these groups but are not limited thereto. For a detailed discussion of the chemotherapeutic agents and their method of administration, see Dorr, et al, Cancer Chemotherapy Handbook, 2d edition, pages 34, Appleton and Lang (Connecticut, 1994) herein incorporated by reference.
DNA-interactive agents include alkylating agents, e.g. cisplatin, cyclophosphamide, altretamine; DNA strand-breakage agents, such as bleomycin; intercalating topoisomerase II inhibitors, dactinomycin and doxorubicin); nonintercalating topoisomerase II inhibitors such as, etoposide and teniposide; and the DNA minor groove binder plicamydin, for example.
The alkylating agents form covalent chemical adducts with cellular DNA, RNA, or protein molecules, or with smaller amino acids, glutathione, or similar chemicals. Generally, alkylating agents react with a nucleophilic atom in a cellular constituent, such as an amino, carboxyl, phosphate, or sulfhydryl group in nucleic acids, proteins, amino acids, or in glutathione. The mechanism and the role of these alkylating agents in cancer therapy is not well understood.
WO 2004/030662 PCT/AU2003/001296 Typical alkylating agents include, but are not limited to, nitrogen mustards, such as chlorambucil, cyclophosphamide, isofamide, mechlorethamine, melphalan, uracil mustard; aziridine such as thiotepa; methanesulphonate esters such as busulfan; nitroso ureas, such as carmustine, lomustine, streptozocin; platinum complexes, such as cisplatin, carboplatin; bioreductive alkylator, such as mitomycin, and procarbazine, dacarbazine and altretamine.
DNA strand breaking agents include bleomycin, for example.
DNA topoisomerase II inhibitors include the following intercalators, such as amsacrine, dactinomycin, daunorubicin, doxorubicin (adriamycin), idarubicin, and mitoxantrone; nonintercalators, such as etoposide and teniposide, for example.
A DNA minor groove binder is plicamycin, for example.
Antimetabolites interfere with the production of nucleic acids by one of two major mechanisms. Certain drugs inhibit production of deoxyribonucleoside triphosphates that are the immediate precursors for DNA synthesis, thus inhibiting DNA replication. Certain of the compounds are analogues ofpurines or pyrimidines and are incorporated in anabolic nucleotide pathways. These analogues are then substituted into DNA or RNA instead of their normal counterparts.
Antimetabolites useful herein include, but are not limited to, folate antagonists such as methotrexate and trimetrexate; pyrimidine antagonists, such as fluorouracil, fluorodeoxyuridine, CB3717, azacitidine, cytarabine, and floxuridine; purine antagonists include mercaptopurine, 6-thioguanine, fludarabine, pentostatin; and ribonucleotide reductase inhibitors include hydroxyurea.
Tubulin interactive agents act by binding to specific sites on tubulin, a protein that polymerizes to form cellular microtubules. Microtubules are critical cell structure units.
WO 2004/030662 PCT/AU2003/001296 -26- When the interactive agents bind the protein, the cell can not form microtubules. Tubulin interactive agents include vincristine and vinblastine, both alkaloids and paclitaxel (Taxol), for example.
Hormonal agents are also useful in the treatment of cancers and tumors. They are used in hormonally susceptible tumors and are usually derived from natural sources. Hormonal agents include, but are not limited to, estrogens, conjugated estrogens and ethinyl estradiol and diethylstilbesterol, chlortrianisen and idenestrol; progestins such as hydroxyprogesterone caproate, medroxyprogesterone, and megestrol; and androgens such as testosterone, testosterone propionate; fluoxymesterone, and methyltestosterone.
Adrenal corticosteroids are derived from natural adrenal cortisol or hydrocortisone. They are used because of their anti-inflammatory benefits as well as the ability of some to inhibit mitotic divisions and to halt DNA synthesis. These compounds include, but are not limited to, prednisone, dexamethasone, methylprednisolone, and prednisolone.
Leutinizing hormone releasing hormone agents or gonadotropin-releasing hormone antagonists are used primarily the treatment of prostate cancer. These include leuprolide acetate and goserelin acetate. They prevent the biosynthesis of steroids in the testes.
Antihormonal antigens include, for example, antiestrogenic agents such as tamoxifen, antiandrogen agents such as flutamide; and antiadrenal agents such as mitotane and aminoglutethimide.
Further agents include the following: hydroxyurea appears to act primarily through inhibition of the enzyme ribonucleotide reductase, and asparaginase is an enzyme which converts asparagine to nonfunctional aspartic acid and thus blocks protein synthesis in the tumour.
WO 2004/030662 PCT/AU2003/001296 -27- Preferred chemotherapeutic agents for use in the subject invention are cisplatin, carboplatin, taxol (paclitaxel), fluorouracil, fluxuridine, cyclophosphamide ifosfamide, hexamethylmelamine, estramustine, mitomycin, and docetaxel.
Compounds of formula also exhibit chemotherapeutic activity and in this regard particular reference can be made to dehydroequol, Cpd. 12.
Preferred bidentate and tridentate platinum ligands of the present invention include those commonly known in the art. For example, suitable bidentate ligands may be selected from ethylene-1,2-diamine and 1,10-phenathraline and other ligands well known in the art.
Preferred platinum complexes are halo and amino substituted, more preferably chloro and amine substituted, more preferably cis-dichlorodiamino substituted. Preferred platinumisoflavonoid complexes are preferably halo and amino substituted, more preferably cisdichloroamino substituted or cis-diaminochloro substituted.
Compounds of the present invention have particular application in the treatment of diseases associated with or resulting from estrogenic effects, androgenic effects, vasolidatory and spasmodic effects, inflammatory effects and oxidative effects.
The amount of compounds of formulae (II) or and (IIa) which are required in a therapeutic treatment according to the invention will depend upon a number of factors, which include the specific application, the nature of the particular compound used, the condition being treated, the mode of administration and the condition of the patient.
Compounds of formulae I or Ia and II may be administered in a manner and amount as is conventionally practised. See, for example, Goodman and Gilman, The Pharmacological Basis of Therapeutics, 1299 (7th Edition, 1985). The specific dosage utilised will depend upon the condition being treated, the state of the subject, the route of administration and other well known factors as indicated above. In general, a daily dose per patient may be in the range of 0.1 mg to 10 g; typically from 0.5 mg to 1 g; preferably from 50 mg to 200 WO 2004/030662 PCT/AU2003/001296 -28mg. Importantly the synergistic relationship of the isoflavonoid compounds of general formula and the chemotherapeutic agent allow for significant reductions in dosage regimes of relatively toxic drugs such as cisplatin, paclitaxel and carboplatin for example.
Other preferred dosage regimes and amounts are set out in the Examples and accompanying drawings.
The production of a pharmaceutical composition for the treatment of the therapeutic indications herein described (for convenience hereafter referred to as the "active compounds") are typically admixed with one or more pharmaceutically or veterinarially acceptable carriers and/or excipients as are well known in the art.
The carrier must, of course, be acceptable in the sense of being compatible with any other ingredients in the formulation and must not be deleterious to the subject. The carrier or excipient may be a solid or a liquid, or both, and is preferably formulated with the compound as a unit-dose, for example, a tablet, which may contain from 0.5% to 59% by weight of the active compound, or up to 100% by weight of the active compound. One or more active compounds may be incorporated in the formulations of the invention, which may be prepared by any of the well known techniques of pharmacy consisting essentially of admixing the components, optionally including one or more accessory ingredients.
The formulations of the invention include those suitable for oral, rectal, optical, buccal (for example, sublingual), parenteral (for example, subcutaneous, intramuscular, intradermal, or intravenous) and transdermal administration, although the most suitable route in any given case will depend on the nature and severity of the condition being treated and on the nature of the particular active compound which is being used.
Formulation suitable for oral administration may be presented in discrete units, such as capsules, sachets, lozenges, or tablets, each containing a predetermined amount of the active compound; as a powder or granules; as a solution or a suspension in an aqueous or WO 2004/030662 PCT/AU2003/001296 29non-aqueous liquid; or as an oil-in-water or water-in-oil emulsion. Such formulations may be prepared by any suitable method of pharmacy which includes the step of bringing into association the active compound and a suitable carrier (which may contain one or more accessory ingredients as noted above). In general, the formulations of the invention are prepared by uniformly and intimately admixing the active compound with a liquid or finely divided solid carrier, or both, and then, if necessary, shaping the resulting mixture such as to form a unit dosage. For example, a tablet may be prepared by compressing or moulding a powder or granules containing the active compound, optionally with one or more accessory ingredients. Compressed tablets may be prepared by compressing, in a suitable machine, the compound of the free-flowing, such as a powder or granules optionally mixed with a binder, lubricant, inert diluent, and/or surface active/dispersing agent(s). Moulded tablets may be made by moulding, in a suitable machine, the powdered compound moistened with an inert liquid binder.
Formulations suitable for buccal (sublingual) administration include lozenges comprising the active compound in a flavoured base, usually sucrose and acacia or tragacanth; and pastilles comprising the compound in an inert base such as gelatin and glycerin or sucrose and acacia.
Compositions of the present invention suitable for parenteral administration conveniently comprise sterile aqueous preparations of the active compounds, which preparations are preferably isotonic with the blood of the intended recipient. These preparations are preferably administered intravenously, although administration may also be effected by means of subcutaneous, intramuscular, or intradermal injection. Such preparations may conveniently be prepared by admixing the compound with water or a glycine buffer and rendering the resulting solution sterile and isotonic with the blood. Injectable formulations according to the invention generally contain from 0.1% to 60% w/v of active compound(s) and are administered at a rate of 0.1 ml/minute/kg or as appropriate. Parenteral administration is a preferred route of administration for the compounds of the present invention.
WO 2004/030662 PCT/AU2003/001296 Formulations suitable for rectal administration are preferably presented as unit dose suppositories. These may be prepared by admixing the active compound with one or more conventional solid carriers, for example, cocoa butter, and then shaping the resulting mixture.
Formulations or compositions suitable for topical administration to the skin preferably take the form of an ointment, cream, lotion, paste, gel, spray, aerosol, or oil. Carriers which may be used include Vaseline, lanoline, polyethylene glycols, alcohols, and combination of two or more thereof. The active compound is generally present at a concentration of from 0.1% to 0.5% w/w, for example, from 0.5% to 2% w/w. Examples of such compositions include cosmetic skin creams.
Formulations suitable for transdermal administration may be presented as discrete patches adapted to remain in intimate contact with the epidermis of the recipient for a prolonged period of time. Such patches suitably contain the active compound as an optionally buffered aqueous solution of, for example, 0.1 M to 0.2 M concentration with respect to the said active compound.
Formulations suitable for transdermal administration may also be delivered by iontophoresis (see, for example, Pharmaceutical Research 3 318 (1986)) and typically take the form of an optionally buffered aqueous solution of the active compound. Suitable formulations comprise citrate or bis/tris buffer (pH 6) or ethanol/water and contain from 0.1 M to 0.2 M active ingredient.
The active compounds may be provided in the form of food stuffs, such as being added to, admixed into, coated, combined or otherwise added to a food stuff. The term food stuff is used in its widest possible sense and includes liquid formulations such as drinks including dairy products and other foods, such as health bars, desserts, etc. Food formulations WO 2004/030662 PCT/AU2003/001296 -31 containing compounds of the invention can be readily prepared according to standard practices.
Therapeutic methods, uses and compositions may be for administration to humans and other animals, including mammals such as companion and domestic animals (such as dogs and cats) and livestock animals (such as cattle, sheep, pigs and goats), birds (such as chickens, turkeys, ducks) and the like.
The active compound or pharmaceutically acceptable derivatives prodrugs or salts thereof can also be co-administered with other active materials that do not impair the desired action, or with materials that supplement the desired action, such as antibiotics, antifungals, antiinflammatories, or antiviral compounds. The active agent can comprise two or more isoflavones or derivatives thereof in combination or synergistic mixture. The active compounds can also be administered with lipid lowering agents such as probucol and nicotinic acid; platelet aggregation inhibitors such as aspirin; antithrombotic agents such as coumadin; calcium channel blockers such as verapamil, diltiazem, and nifedipine; angiotensin converting enzyme (ACE) inhibitors such as captopril and enalapril, and 3blockers such as propanolol, terbutalol, and labetalol. The compounds can also be administered in combination with nonsteriodal antiinflammatories such as ibuprofen, indomethacin, aspirin, fenoprofen, mefenamic acid, flufenamic acid and sulindac. The compounds can also be administered with corticosteroids.
The co-administration may be simultaneous or sequential. Simultaneous administration may be effected by the compounds being in the same unit dose, or in individual and discrete unit doses administered at the same or similar time. Sequential administration may be in any order as required and typically will require an ongoing physiological effect of the first or initial active agent to be current when the second or later active agent is administered, especially where a cumulative or synergistic effect is desired.
WO 2004/030662 PCT/AU2003/001296 -32- The isoflavones of formula for use in the present invention may be derived from any number of sources readily identifiable to a person skilled in the art. Preferably, they are obtained in the form of concentrates or extracts from plant sources. Again, those skilled in the art will readily be able to identify suitable plant species, however, for example, plants of particular use in the invention include leguminous plants. More preferably, the isoflavone extract is obtained from chickpea, lentils, beans, red clover or subterranean clover species and the like.
Isoflavone extracts may be prepared by any number of techniques known in the art. For example, suitable isoflavone extracts may be prepared by water/organic solvent extraction from the plant source. It will be appreciated that an isoflavone extract may be prepared from any single tissue of a single species of plant or a combination of two or more different tissues thereof. Similarly, an extract may be prepared from a starting material which contains a heterogeneous mixture of tissues from two or more different species of plant.
Generally, where an isoflavone extract is prepared from plant material, the material may be comminuted or chopped into smaller pieces, partially comminuted or chopped into smaller pieces and contacted with water and an organic solvent, such as a water miscible organic solvent. Alternatively, the plant material is contacted with water and an organic solvent without any pre-treatment. The ratio of water to organic solvent may be generally in the range of 1:10 to 10:1 and may, for example, comprise equal proportions of water and solvent, or from 1% to 30% organic solvent. Any organic solvent or a mixture of such solvents may be used. The organic solvent may preferably be a C2-10, more preferably a C1-4 organic solvent (such as methanol, chloroform, ethanol, propanol, propylene glycol, erythrite, butanol, butanediol, acetonitrile, ethylene glycol, ethyl acetate, glycidol, glycerol dihydroxyacetone or acetone). Optionally the water/organic solvent mixture may include an enzyme which cleaves isoflavone glycosides to the aglycone form.
The mixture may be vigorously agitated so as to form an emulsion. The temperature of the mix may range, for example, from an ambient temperature to boiling temperature.
WO 2004/030662 PCT/AU2003/001296 -33- Exposure time may be between one hour to several weeks. One convenient extraction period is twenty-four hours at 90 0 C. The extract may be separated from undissolved plant material and the organic solvent removed, such as by distillation, rotary evaporation, or other standard procedures for solvent removal. The resultant extract containing water soluble and non-water soluble components may be dried to give an isoflavone-containing extract, which may be formulated with one or more pharmaceutically acceptable carriers, excipients and/or auxiliaries according to the invention.
An extract made according to the description provided in the previous paragraphs may contain small amounts of oil which include isoflavones in their aglycone form (referred to herein as isoflavones). This isoflavone enriched oil, may be subject to HPLC to adjust the isoflavone ratios, or, if it is at the desired isoflavone ratio, may be dried, for example in the presence of silica, and be formulated with one or more carriers, excipients and/or auxiliaries to give an isoflavone containing extract. Alternatively, the isoflavones contained in said small amounts of oil may be further concentrated by addition to the oil of a non-water soluble organic solvent such as hexane, heptane, octane acetone or a mixture of one or more of such solvents. One example is 80% hexane, 20% acetone w/w having high solubility for oils but low solubility for isoflavones. The oil readily partitions into the organic solvent, and an enriched isoflavone containing extract falls out of solution. The recovered extract may be dried, for example in an oven at 50 0 C to about 120 0 C, and formulated with one or more pharmaceutically acceptable carriers, excipients and/or auxiliaries.
It will be appreciated that the present invention also contemplates the production of suitable isoflavones, functional derivatives, equivalents or analogues thereof, by established synthetic techniques well known in the art. See, for example, Chang et al.
(1994) which discloses methods appropriate for the synthesis of various isoflavones.
International Patent Applications WO 98/08503 and WO 00/49009 (which are incorporated herein in their entirety by reference) and references cited therein also provide WO 2004/030662 PCT/AU2003/001296 -34general synthetic methods for the preparation ofisoflavonoid compounds for use in the present invention.
General methods known in the art may also be employed by those skilled in the art of chemical synthesis for constructing the platinum complexes depicted in formula and by reference to the general schemes 1 and 2 below.
Chemical functional group protection, deprotection, synthons and other techniques known to those skilled in the art may be used where appropriate in the synthesis of the compounds of the present invention.
NaO O Cl- Pt CI C
OH
I
C I-Pt O Cl Scheme 1 WO 2004/030662 PCT/AU2003/001296
CI
CI-Pt- O +HN NH3 I
I
Cl
OH
NH2 N-Pt-0 0 H2 C1
OH
Scheme 2 The inventors have found a surprising synergy between the compounds of formula and in particular the isoflav-3-ene compounds of formula (VIa), with known chemotherapeutic agents. The isoflavonoid compounds of the invention are found to restore or at least improve chemosensitivity to previously resistant cancer cell lines. In particular, dehydroequol (12, DHE) is found to exhibit synergistic interaction with cisplatin, carboplatin and paclitaxel with various established cancer cell lines, in particular the ovarian cancer cell lines Cp70 and A27A0. Synergism was also observed with prostate cancer cell lines DU145 and PC3 and pancreatic cell line HPAC.
These results are further elucidated in the examples which follow. These results show that combination chemotherapy with the isoflavonoid compounds with established anticancer agents are useful in the treatment of proliferation of cancer cells and neoplastic tumours by reducing the IC 5 0 of standard chemotherapy. Administration of the isoflavonoid compounds described herein either simultaneously, sequentially or as a pre-treatment to standard chemotherapies increases the sensitivity of the cancer cells and tumours to WO 2004/030662 PCT/AU2003/001296 -36chemotoxic agents.
The Examples show the efficacy of combination chemotherapy with dehydroequol as a treatment for epithelial ovarian cancer cells by such reduction of the IC50 of standard chemotherapy. This thereby increases sensitivity of the cancer cells to chemotoxic agents.
The results of these tests and trial are important as ovarian cancer is the fourth leading cause of cancer death and the most lethal of the gynaecologic malignancies. Recent new therapies have led to some improvement in the five year survival, yet there has been no improvement in the overall survival. The main limitations of therapy in ovarian cancer patients are chemoresistance and side-effects. The combination chemotherapy and isoflavonoid pre-treatment addresses the survival rates of patients undergoing the chemotherapy, and in particular those patients with ovarian cancer. Without wishing to be limited to theory, it is believed that the isoflavone derivative dehydroequol induces apoptosis in ovarian cancer cells by specifically removing the blockers of apoptosis.
The invention is further described with reference to the following non-limiting examples.
Example 1 Dehydroequol-Cisplatin Synergy in vitro The effect of a composition comprising the platinum complex cisplatin and the isoflavonoid compound dehydroequol (compound No. 12) on various cancer cell lines was assessed on culture plates. Cell viability was determined using CellTiter©. Apoptosis was evaluated using Hoechst 33342 dye.
It was found that the amount of cisplatin needed to kill a set number of cancer cells is less when in admixture with an isoflavonoid compound as compared to a control with cisplatin alone. This example demonstrates the surprising synergy between cisplatin and the isoflavonoid compounds of the present invention. Dehydroequol was found to exhibit a strong synergistic interaction with cisplatin in cell lines derived from ovarian (A2780, Cp70), prostate (DU145 and PC3) and pancreatic (HPAC) cancers. Table 1 below shows WO 2004/030662 PCT/AU2003/001296 -37that the IC 5 0 of cisplatin against the mentioned cell lines is markedly lowered by coincubating representative cells with a sub-IC5o level (2 tM) of dehydroequol.
Table 1. Effect of concurrent exposure to dehydroequol and cisplatin on the IC 5 o levels on nominated cancer cell lines Cell line IC 50 (uM) Cisplatin ICso (uM) Cisplatin dehydroequol 2 uM dehydroequol A2780 3.0 1.7 <0.001 10.4 1.5 0.1 HPAC 34.5 50.0 7.7 PC3 0.4 9.6 <0.001 DU145 5.0 5.9 0.1 Example 2 Dehydroequol-Cisplatin, Dehydroequol-Carboplatin and Dehydroequol-Paclitaxel Synergy in vitro and in vivo Methods The in vitro studies were performed using ovarian cancer cells isolated from ascites using an immunomagnetic assay and established ovarian cancer cell lines CP70 and A2780. Cell viability was determined using CellTiter©. Apoptosis was evaluated using Hoechst 33342 dye. The in vivo effect was tested by injecting CP70 subcutaneously into nude mice.
Animals received daily oral administration of dehydroequol, 10 or 20 mg/kg for 8 days alone or in combination with cisplatin 0.5 mg/kg. After 8 days the animals were sacrificed and the tumour volume was measured.
The IC50 for carboplatin ranged from 60 gg/ml to greater than 100 gg/ml (Figure 1).
The IC50 for paclitaxel in the paclitaxel resistant cell line, R182, was greater than 2AM (Figure 2).
WO 2004/030662 PCT/AU2003/001296 -38- Pre-treatment with dehydroequol (10 [tg/ml) for two hours significantly reduced the for carboplatin (0.5 Rg/ml 0.5) and paclitaxel (0.05 j.M) (Figures 3 and 4).
Western blot analysis demonstrated that resistant ovarian cancer cells expressed high levels of active XIAP. Additionally, the active form ofcaspase 3 in chemoresistant cells was not dctcted. Caspase 3 activation was observed in the chemoresistant cells only after pre-treatment with dehydroequol (Figure Figures 6 and 7 depict the results of the next study, where 20 mg/kg dehydroequol (DHE) HPBCD was compared to delivery of cisplatin and to a combination of dehydroequol and cisplatin. The 20 mg/kg Phen-1 mg/kg cisplatin dosage regimen inhibited tumour proliferation but the data was not significantly different from cisplatin (1 mg/kg) and dehydroequol (20 mg/kg) controls. Importantly and somewhat surprisingly, the lower dose 10mg/kg dehydroequol-0.5 mg/kg cisplatin combination regimen inhibited tumour proliferation more markedly than that over the 20 mg/kg dehydroequol-lmg/kg cisplatin 14.7) regimen and the data were significantly different from single agent controls (Figures 6 and 7).
Dehydroequol treatment for 48 hours induced 60-80% decrease in cell viability in carboplatin and paclitaxel resistant cells. Pre-treatment with pH alone for 2 h decreased cell viability by 20%. Furthermore, pre-treatment (2 h) with pH in chemoresistant cells followwed by carboplatin or paclitaxel for 48 h resulted in a 30% and 50% significant decrease in cell viability, respectively. Hoechst stain confirmed the presence of apoptosis in the treated cells. In vivo, cisplatin (0.5 mg/kg) had no effect on tumour size while the combination of pH (10 mg/kg) and cisplatin 0.5 mg/kg) reduced tumour mass by (p=0.05).
WO 2004/030662 PCT/AU2003/001296 -39- Example 3 Toxicity Dehydroequol and cisplatin No overt signs of toxicity were noted at any of the dosage regimens used as shown in Figure 8. Fluctuations in body mass were within ethically acceptable boundaries.
These examples highlight the utility of the isoflavonoid compounds of formula in combination with chemotherapeutic agents, and the compounds of formula (II) or (IIa) and as therapeutic agents for inducing sensitivity to chemoresistant cancer cells and tumours to low levels of chemotherapy and to the general down regulation of cell proliferation and the treatment, amelioration, defence against, prophylaxis and/or prevention of the therapeutic indications.
Those skilled in the art will appreciate that the invention described herein is susceptible to variations and modifications other than those specifically described. It is to be understood that the invention includes all such variations and modifications. The inventions also includes all of the steps, features, compositions and compounds referred to or indicated in the specification, individually or collectively, and any and all combinations of any two or more of said steps or features.
The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that that prior art forms part of the common general knowledge in the field of endeavour.
Claims (34)
1. A method of increasing the sensitivity of cancer cells or a tumour to a chemotherapeutic agent by contacting said cells or tumour with an isoflavonoid compound of the formula: F (VII) R1, i Z' (VI) 4 (IX) in which RI, R 2 and Z are independently hydrogen, hydroxy, OR 9 OC(O)Rio, OS(O)R 1 o, CHO, C(O)Rio, COOH, CO 2 Rio, CONR 3 R4, alkyl, haloalkyl, arylalkyl, alkenyl, alkynyl, to aryl, heteroaryl, alkylaryl, alkoxyaryl, thio, alkylthio, amino, alkylamino, dialkylamino, nitro or halo, or R 2 is as previously defined, and RI and Z taken together with the carbon atoms to which they are attached form a five-membered ring selected from T O TO 0 0 RI is as previously defined, and R 2 and Z taken together with the carbon atoms to which they are attached form a five-membered ring selected from P WPD0CSXMDrpp 222691 d.c-29M9I2n8 00 0 -41- 0 O0 e T O f W is RI, C wherein: SR 3 is hydrogen, alkyl, arylalkyl, alkenyl, aryl, an amino acid, C(O)RII where R n is CN s hydrogen, alkyl, aryl, arylalkyl or an amino acid, or CO 2 RI2 where RI2 is hydrogen, alkyl, haloalkyl, aryl or arylalkyl, R 4 is hydrogen, alkyl or aryl, or R 3 and R 4 taken together with the nitrogen to which they are attached comprise pyrrolidinyl or piperidinyl, R 5 is hydrogen, C(O)Ri 1 where R 11 is as previously defined, or C0 2 RI 2 where R 1 2 is as previously defined, R 6 is hydrogen, hydroxy, alkyl, aryl, amino, thio, NR 3 R 4 CORn where RIn is as previously defined, CO 2 RI 2 where RI2 is as previously defined or CONR 3 R4, R 9 is alkyl, haloalkyl, aryl, arylalkyl, C(O)RI, where R 11 is as previously defined, or Si(R 1 3 3 where RI 3 is independently hydrogen, alkyl or aryl. Rio is hydrogen, alkyl, haloalkyl, amino, aryl, arylalkyl, an amino acid, alkylamino or dialkylamino, the drawing represents either a single bond or a double bond, T is independently hydrogen, alkyl or aryl, RI 4 and R 1 5 are independently hydrogen, hydroxy, OR 9 OC(O)Rio, OS(O)RIo, CHO, C(O)Rio, COOH, CO 2 Rio, CONR 3 R4, alkyl, haloalkyl, arylalkyl, alkenyl, alkynyl, aryl, heteroaryl, thio, alkylthio, amino, thioalkyl, alkylamino, dialkylamino, nitro or halo, or R 1 4 and R 15 are fused together to form a cyclic alkyl aromatic or heteroaromatic structure, and pharmaceutically acceptable salts thereof.
2. The method of claim 1, wherein RI,R 2 R 14 Ris, W and Z are independently P \WPD0CS\MD\Sp-\I 2228691 doc.9M9MWS 00 0 -42- V hydrogen, hydroxy, OR 9 OC(O)Rio, C(O)Rio, COOH, C0 2 R 0 i, alkyl, haloalkyl, arylalkyl, O aryl, thio, alkylthio, amino, alkylamino, dialkylamino, nitro or halo, R 5 is hydrogen, C(O)RIn where R 11 is hydrogen, alkyl, aryl, or an amino acid, or CO 2 Ri 2 where Ri2 is hydrogen, alkyl or aryl, s R is hydrogen, hydroxy, alkyl, aryl, CORnl where Rn is as previously defined, or tV INO CO 2 RI 2 where R 1 2 is as previously defined, SR 9 is alkyl, haloalkyl, arylalkyl, or C(O)RI, where R 1 I is as previously defined, and SRio is hydrogen, alkyl, amino, aryl, an amino acid, alkylamino or dialkylamino.
3. The method of claim 2, wherein R, and RI 4 are independently hydroxy, io OR 9 OC(O)Rio or halo, R 2 Ris, W and Z are independently hydrogen, hydroxy, OR 9 OC(O)Rio, C(O)Rio, COOH, C0 2 Rio, alkyl, haloalkyl, or halo, Rs is hydrogen, C(O)RI where R 11 is hydrogen or alkyl, or CO 2 RI2 where R 12 is hydrogen or alkyl, R 6 is hydrogen or hydroxy, R 9 is alkyl, arylalkyl or C(O)R 1 where R 1 l is as previously defined, and Rio is hydrogen or alkyl.
4. The method of claim 3, wherein Ri and Ri 4 are independently hydroxy, methoxy, benzyloxy, acetyloxy or chloro, R 2 R 5 l, W and Z are independently hydrogen, hydroxy, methoxy, benzyloxy, acetyloxy, methyl, trifluoromethyl or chloro, R 5 is hydrogen or CO 2 Ri2 where R 1 2 is hydrogen or methyl, and R 6 is hydrogen.
The method of claim 1, wherein the compound is a compound of the general formula P \WPDOCS\MDTlSpec\lI2228691.doc-29)9200 00 0 -43- CW (V l a) Z6 R 1 Z R2 R 14 IND r n wherein RI, R 2 W, Z, R 6 RI 4 and RI5 are as defined in any one of claims 1 to 4. O
6. The method of claim 5, wherein RI, R 2 R 14 R 15 W and Z are independently hydrogen, hydroxy, OR 9 OC(O)Rio, C(O)Rio, COOH, C0 2 Rio, alkyl, s haloalkyl, arylalkyl, aryl, thio, alkylthio, amino, alkylamino, dialkylamino, nitro or halo, R 6 is hydrogen, hydroxy, alkyl, aryl, CORi, where RII is hydrogen, alkyl, aryl or an amino acid, or C0 2 RI2 where Ri 2 is hydrogen, alkyl or aryl, R 9 is alkyl, haloalkyl, arylalkyl, or C(O)Rli where R 1 I is as previously defined, and RIO is hydrogen, alkyl, amino, aryl, an amino acid, alkylamino or dialkylamino.
7. The method of claim 6, wherein Ri is hydroxy, OR 9 OC(O)Ro or halo, R 2 RI 4 Ris, W and Z are independently hydrogen, hydroxy, OR 9 OC(O)Rio, C(O)Rio, COOH, C0 2 Rio, alkyl, haloalkyl, or halo, R 6 is hydrogen, R 9 is alkyl, arylalkyl or C(O)Rli where RiI is hydrogen, alkyl, aryl or an amino is acid, and Rio is hydrogen or alkyl.
8. The method of claim 7, wherein RI is hydroxy, methoxy, benzyloxy, acetyloxy or chloro, R 2 RI 4 R 1 5 W and Z are independently hydrogen, hydroxy, methoxy, benzyloxy, acetyloxy, methyl, trifluoromethyl or chloro, and R 6 is hydrogen.
9. The method of any one of claims 1 to 8, wherein the sensitivity of the cancer cells or tumour is restored. P:\WPDOCS\MDTnSpma\l2228691doc-29M)9/2I8 00 0 -44-
10. The method of any one of claims 1 to 9, wherein the isoflavonoid O compound is administered to a subject in need of such treatment.
11. A method for the treatment, prophylaxis, amelioration, defence against c and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress, which method includes the step of administering a compound of formula (VIa), (VII) or as defined in any one of claims 1 to 8 and a chemotherapeutic agent.
12. The method of claim 11, wherein the cancer is selected from breast cancer, prostatic cancer, testicular cancer, ovarian cancer, pancreatic cancer, uterine cancer and colorectal cancer.
13. The method of claim 12, wherein the cancer is selected from ovarian cancer, prostatic cancer and pancreatic cancer.
14. The method of claim 11, wherein the administration of the compound of formula (VIa), (VII) or (IX) precedes the administration of the chemotherapeutic agent.
15. The method of claim 11, wherein the administration of the compound of formula (VIa), (VII) or (IX) and the chemotherapeutic agent is simultaneous.
16. The method of claim 11, wherein the method follows observed resistance by cancer cells or tumour to a chemotherapeutic agent.
17. The method of any one of claims 11 to 16, wherein the compound is as defined in any one of claims 5 to 8.
18. The method of any one of claims 11 to 17, wherein the compound is dehydroequol.
19. The method of any one of claims 11 to 18, wherein the chemotherapeutic agent is cisplatin, paclitaxel or carboplatin.
Use of a compound of formula (VIa), (VII) or (IX) as defined in P.WPDOCS\MDT1pe\l 12228691 doc2909/2008 00 O 0 iany one of claims 1 to 8, and a chemotherapeutic agent, in the manufacture of a medicament for the treatment of cancer or a disease associated with antioxidant stress.
21. Use of a compound selected from the following: l"- W W NO R, O0 R 6 R1 O R (VI) R, 0 R 6 (VII) R, OH R5 (IX) z R15 Z R OR 2 R R2 R2 R14 R14 in which Ri, R 2 and Z are independently hydrogen, hydroxy, OR 9 OC(O)Rio, OS(O)R 0 CHO, C(O)Rio, COOH, C0 2 Rio, CONR 3 R 4 alkyl, haloalkyl, arylalkyl, alkenyl, alkynyl, aryl, heteroaryl, alkylaryl, alkoxyaryl, thio, alkylthio, amino, alkylamino, dialkylamino, nitro or halo, or R 2 is as previously defined, and R, and Z taken together with the carbon atoms to which they are attached form a five-membered ring selected from T 0 0 T O ,or R 1 is as previously defined, and R 2 and Z taken together with the carbon atoms to which they are attached form a five-membered ring selected from P\WPDOCSWMDTSpc\ 2228691 doc-29/9/2008 00 0 -46- e 0 O T 0 t' W is Ri, C wherein: O R 3 is hydrogen, alkyl, arylalkyl, alkenyl, aryl, an amino acid, C(0)R 1 where R, is CN 5 hydrogen, alkyl, aryl, arylalkyl or an amino acid, or C0 2 Ri 2 where Ri2 is hydrogen, alkyl, haloalkyl, aryl or arylalkyl, R4 is hydrogen, alkyl or aryl, or R 3 and R4 taken together with the nitrogen to which they are attached comprise pyrrolidinyl or piperidinyl, R 5 is hydrogen, C(0)R 1 where RI is as previously defined, or C0 2 RI2 where RI2 is as previously defined, R6 is hydrogen, hydroxy, alkyl, aryl, amino, thio, NR 3 R4, CORIn where R 11 is as previously defined, C0 2 RI 2 where RI2 is as previously defined or CONR 3 R4, R9 is alkyl, haloalkyl, aryl, arylalkyl, C(0)RII where R1I is as previously defined, or Si(R 1 3 3 where Ri3 is independently hydrogen, alkyl or aryl. Rio is hydrogen, alkyl, haloalkyl, amino, aryl, arylalkyl, an amino acid, alkylamino or dialkylamino, the drawing represents either a single bond or a double bond, T is independently hydrogen, alkyl or aryl, RI4 and Ris are independently hydrogen, hydroxy, OR9, OC(0)Rio, OS(O)RIo, CHO, C(0)R 1 o, COOH, C0 2 Rio, CONR 3 R 4 alkyl, haloalkyl, arylalkyl, alkenyl, alkynyl, aryl, heteroaryl, thio, alkylthio, amino, thioalkyl, alkylamino, dialkylamino, nitro or halo, or RI4 and Ris are fused together to form a cyclic alkyl aromatic or heteroaromatic strutcure, and pharmaceutically acceptable salts thereof, in the manufacture of a medicament for increasing the sensitivity of cancer cells or a tumour to a chemotherapeutic agent.
P \WPDOCS\MDTISplcs\I222691 d2oc-29/92008 00 I O -47- S22. Use of a compound of formula (VIa), (VII) or (IX) as defined in any one of claims 1 to 8, and a chemotherapeutic agent, in the manufacture of a medicament for the treatment, prophylaxis, amelioration, defence against and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress. tc,
23. A pharmaceutical composition comprising a compound of formula C (Via), (VII) or (IX) as defined in any one of claims 1 to 8, and a chemotherapeutic agent.
24. A platinum complex or analogue thereof of the general formula (II): RA I RD-Pt-RB (II) I Rc in which RA, RB, RC, and RD are independently halo, hydroxy, XRE, alkoxy, OC(O)RF, OS(O)RF, thio, alkylthio, amino, alkylamino or dialkylamino, X is O, NRF or S, and RF is hydrogen, alkyl, arylalkyl, alkenyl, aryl or an amino acid, is wherein at least one of RA, RB, Rc, and RD is XRE where RE is a compound represented by the general formula (VIa), (VII) or (IX) as defined in any one of claims 1 to 8, or is derived from or is a radical or ion of the compound of formula (VIa), (VII) or (IX) as defined in any one of claims 1 to 8, and ligates to the platinum through any one or more of the oxygen heteroatoms, or a radical of the heteroatoms defined as part of RE or alternatively by a double bond on the compound of formula (VIa), (VII) or (IX), and when RA is XRE, RB, Rc and/or RD together may form part of a bidentate or tridentate ligand of general formula and respectively P WPDOCSMDTSp=U 2229691 dw-29X)912008 00 S-48- SL SR6 R6 R6- R6 R6 (CH 2 )n L L L L I (T) O wherein L represents a ligating atom chosen from N, O and S, C1 n is from 0 to 8, and each R 6 is as defined in claim 1, or may together form part of a cyclic alkyl, aromatic or heteroaromatic structure, which platinum complexes include pharmaceutically acceptable salts thereof.
Use of one or more platinum complexes of the formula as defined in claim 24, in the manufacture of a medicament for the treatment, amelioration, defence against, prophylaxis and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress.
26. A method for the treatment, prophylaxis, amelioration, defence against and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress which method comprises administering to a subject a therapeutically effective amount of one or more platinum complexes of the formula (II) as defined in claim 24.
27. A pharmaceutical composition comprising one or more platinum complexes of the formula (II) as defined in claim 24, in association with one or more pharmaceutical carriers and/or excipients.
28. A composition comprising a platinum complex of the general formula (IIa), RG I RJ-Pt-RH (Ila) RI n RI P kPDOCSWD1SpcacsI222M91 doc29'W20)8 00 O 0 -49- in which RG, RH, RI, and Rj are independently halo, hydroxy, alkoxy, OC(O)RK, OS(O)RK thio, alkylthio, amino, alkylamino or dialkylamino, 1 X is O, NRK or S, and ec¢ RK is hydrogen, alkyl, arylalkyl, alkenyl, aryl or an amino acid, NO in association with a compound of the general formula (VIa), (VII) or as defined in any one of claims 1 to 8, and pharmaceutically acceptable salts thereof. O
29. Use of a platinum complex of the formula (IIa), as defined in claim 28 and a compound of the formula (VIa), (VII) or as defined in any one of claims 1 to to 8, in the manufacture of a medicament for the treatment, amelioration, defence against, prophylaxis and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress. The pharmaceutical composition of claim 23, which is a synergistic pharmaceutical composition.
Is
31. Use of a compound of the formula (VIa), (VII) or as defined in any one of claims 1 to 8 and a chemotherapeutic agent, in the manufacture of a medicament for the treatment, prophylaxis, amelioration, defence against and/or prevention of sunlight induced skin damage.
32. A method for the treatment, prophylaxis, amelioration, defence against and/or prevention of sunlight induced skin damage said method comprising administering to a subject a therapeutically effective amount of a compound of the formula (VI), (VIa), (VII) or as defined in any one of claims 1 to 8 and a chemotherapeutic agent.
33. A method for the treatment, amelioration, defence against prophylaxis and/or prevention of cell proliferation, cancer or a disease associated with oxidant stress which comprises administering to a subject a therapeutically effective amount of a platinum complex of the formula (IIa), as defined in claim 28 and a compound of the formula (VIa), (VII) or (IX) as defined in any one of claims 1 to 8.
34. The complex of claim 24, wherein only RA is XRE.
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