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topical gemcitabine hydrochloride A topical preparation of gemcitabine hydrochloride with antineoplastic activity. Gemcitabine, an analogue of the antimetabolite nucleoside deoxycytidine, is converted intracellularly to the active metabolites difluorodeoxycytidine di- and triphosphate (dFdCDP, dFdCTP). dFdCDP inhibits ribonucleotide reductase, thereby decreasing the deoxynucleotide pool available for DNA synthesis; dFdCTP is incorporated into DNA, resulting in DNA strand termination and apoptosis. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)
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