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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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R(+)XK469
The R-isomer of a synthetic quinoxaline phenoxypropionic acid derivative with proapoptotic and antiproliferative activities. R(+)XK469 selectively inhibits topoisomerase II-beta, blocks activation of MEK/MAPK signaling kinases, stimulates caspases, and upregulates p53-dependent proteins, including cyclins A and B1, thereby arresting cancer cells in the G2/M phase of the cell cycle. Both R(+) and S(-) isomers of this agent are cytotoxic, although the R-isomer is more potent. Check for active clinical trials using this agent. (NCI Thesaurus)

Synonym:XK469
Chemical structure:
  • 2-{4-[(7-chloro-2-quinoxalinyl)oxy]phenoxy}propionic acid
  • propanoic acid, 2-[4-[(7-chloro-2-quinoxalinyl)oxy]phenoxy}-, (+ )-(R)-