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.

A progesterone derivative with antineoplastic activity. Testolactone inhibits steroid aromatase, thereby preventing the formation of estrogen from adrenal androstenedione and reducing endogenous estrogen levels. Check for active clinical trials using this agent. (NCI Thesaurus)

therapeutic testolactone
US brand name:Teslac
Code name:SQ-9538
Chemical structure:
  • 1,2,3,4,4a,4b,7,9,10,10a-decahydro-2-hydroxy-2,4b-dimethyl-7-oxo-1-phenanthrenepropionic acid delta-lactone
  • 13-hydroxy-3-0x0-13,17-secoandrosta-1,4-dien-17-oic acid delta-lactone
  • 17alpha-oxo-D-homo-1,4-androstadiene-3,17-dione
  • 1-dehydrotestololactone
  • delta-1-testololactone
  • D-homo-17a-oxaandrosta-1,4-diene-3,17-dione