NCI Drug Dictionary

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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.

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enasidenib mesylate
Patient Information
The mesylate salt form of enasidenib, an orally available inhibitor of specific mutant forms of the mitochondrial enzyme isocitrate dehydrogenase type 2 (IDH2), with potential antineoplastic activity. Upon administration, enasidenib specifically inhibits various mutant forms of IDH2, including the IDH2 variants R140Q, R172S, and R172K, which inhibits the formation of 2-hydroxyglutarate (2HG). This may lead to both an induction of cellular differentiation and an inhibition of cellular proliferation in IDH2-expressing tumor cells. IDH2, an enzyme in the citric acid cycle, is mutated in a variety of cancers; it initiates and drives cancer growth by blocking differentiation and the production of the oncometabolite 2HG. Check for active clinical trials using this agent. (NCI Thesaurus)

Synonym:AG-221 mesylate
enasidenib methanesulfonate
US brand name:Idhifa
Code name:CC-90007
Chemical structure:
  • 2-methyl-1-[(4-[6-(trifluoromethyl)pyridin-2-yl]-6-{[2-(trifluoromethyl)pyridin-4-yl]amino}-1,3,5- triazin-2-yl)amino]propan-2-ol methanesulfonate
  • 2-propanol, 2-methyl-1-((4-(6-(trifluoromethyl)-2-pyridinyl)-6-((2-(trifluoromethyl)-4-pyridinyl)amino)-1,3,5-triazin-2-yl)amino)-, methanesulfonate (1:1)