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• W1991574245 endingPage "835" @default.
• W1991574245 startingPage "807" @default.
• W1991574245 abstract "Valspodar (Amdray®, SDZ PSC 833) is derived from cyclosporin, but lacks the immunosuppressive and most of the collateral activities of cyclosporin A (CsA, Sandimmune®, Neoral®); it exhibits an enhanced capacity to chemosensitise tumour cells showing the classical type multiple drug-resistance (MDR) associated with MDR1 P-glycoprotein (Pgp) overexpression. This valspodar-mediated chemosensitisation of MDR tumour cells is reviewed with regard to its mechanism of inhibition on Pgp flippase function, and its potential inhibition of anticancer drug (ACD) metabolisation by CYP3A enzymes is discussed. Potent inhibition of the membranous and cytoplasmic detoxification mechanisms expressed by cells at the absorption and clearance borders in the body by valspodar results in the many pharmacokinetic interactions with other drugs that are substrates of either, or both, Pgp and CYP classes of detoxifying enzyme. In view of the present ability to restrict oral bioavailability of valspodar within a narrow range, and to adapt adequately the chemotherapeutic dosages to achieve their equivalent exposure in the presence or absence of valspodar, current clinical data on its efficacy and safety permit optimism for ongoing Phase III trials. The potential of valspodar to increase exposure or to modulate the biodistribution of other chemotherapeutics, such as HIV protease inhibitors to the brain, is further evoked, as this might become another application of the new drug. This evaluation of valspodar compared to CsA attempts to interpret its mechanisms of action, rather than to serve as a complete and comparative repertoire of all published preclinical and clinical data." @default.
• W1991574245 created "2016-06-24" @default.
• W1991574245 creator A5024972612 @default.
• W1991574245 date "1999-06-01" @default.
• W1991574245 modified "2023-09-26" @default.
• W1991574245 title "Valspodar: current status and perspectives" @default.
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