NCI Drug Dictionary
The NCI Drug Dictionary contains technical definitions and synonyms for drugs/agents used to treat patients with cancer or conditions related to cancer. Each drug entry includes links to check for clinical trials listed in NCI's List of Cancer Clinical Trials.
- Z-endoxifen hydrochloride
The hydrochloride salt and the z (cis-) stereoisomer of endoxifen with potential antineoplastic activity. Endoxifen, the active metabolite of tamoxifen, competitively inhibits the binding of estradiol to estrogen receptors, thereby preventing the receptor from binding to the estrogen-response element on DNA and thus reducing DNA synthesis. Unlike tamoxifen, however, which relies on CYP2D6 activity for its conversion to the active metabolite endoxifen, the direct administration of endoxifen bypasses the CYP2D6 route. As CYP2D6 activity can vary widely among individuals due to genetic CYP2D6 polymorphisms, endoxifen is therefore theoretically more potent and more uniform in its bioavailability across patient populations. Check for active clinical trials using this agent. (NCI Thesaurus)
Chemical structure: 4-hydroxy-N-desmethyltamoxifen hydrochloride