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pubmed-article:7636864pubmed:abstractTextThe synthesis of a series of platinum complexes of trans coordination geometry [centered around the general formula, trans-ammine(amine)dichlorodihydroxoplatinum(IV) plus corresponding tetrachloroplatinum(IV) or Pt(II) counterparts] is described as part of a drug discovery program to identify more effective platinum-based anticancer drugs, particularly targeted toward the circumvention of resistance to cisplatin. Complexes have been evaluated for antitumor activity using in vitro and in vivo tumor models. In vitro against a panel of cisplatin-sensitive and -resistant human tumor cell lines (predominantly ovarian), many of the trans platinum complexes studied (e.g., 1, R = cyclohexyl) exhibited comparable potency to cisplatin and also overcame acquired cisplatin resistance, where resistance was due mainly to either reduced drug uptake or enhanced platinum-DNA adduct removal. Moreover, 14 trans complexes showed significant in vivo antitumor activity against the subcutaneous murine ADJ/PC6 plasmacytoma model; all were platinum(IV) complexes, 13/14 possessing axial hydroxo ligands the other possessing axial ethylcarbamato ligands. Where tested, all of their respective platinum(II) or tetrachloroplatinum(IV) counterparts were inactive. Notably, three dihydroxoPt(IV) complexes (18, 29, 34) (R = c-hexyl, c-heptyl, and 1-adamantyl) retained some efficacy against a cisplatin-resistant variant of the ADJ/PC6. Compounds 18 (trans-[PtCl2(OH)2NH3-(RNH2)]) R = c-C6H11, 22, R = Me3C, 27, R = n-C6H13, 28, R = PhCH2, and 36 (trans-[PtBr2(OH)2NH3(c-C6H11NH2)]) also produced evidence of antitumor activity (> 5 days growth delay) against subcutaneously grown advanced stage human ovarian carcinoma xenografts. These data demonstrate that a series of trans-ammine(amine)dichlorodihydroxoplatinum(IV) complexes are active in vivo against both murine and human subcutaneous tumor models and represent potential leads to a new generation of platinum-based anticancer drug.lld:pubmed
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pubmed-article:7636864pubmed:articleTitleSynthesis and in vitro and in vivo antitumor activity of a series of trans platinum antitumor complexes.lld:pubmed
pubmed-article:7636864pubmed:affiliationCRC Centre for Cancer Therapeutics, Institute of Cancer Research, Belmont, Sutton, Surrey, United Kingdom.lld:pubmed
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pubmed-article:7636864pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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