Abstract
RU54115 is a new potent inhibitor of aromatase. In vitro, it inhibits the enzyme from human placental microsomes with a K i of 0.5 nM, which places it among the tightest reported steroidal inhibitors of aromatase. In vivo, it lowers the amount of circulating estradiol in pregnant mare serum gonadotrophin (PMSG)-primed female rats with an ED 50 of 0.4 mg/kg when given s.c. and 4 mg/kg when given orally. An oral dose of 25 mg/kg when given once daily to female rats was able to inhibit the growth of DMBA-induced mammary tumors.
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