Abstract
1003 Background: The AR may be a therapeutic target for pts with androgen-driven TNBC. ENZA, a potent AR inhibitor, is approved in men with metastatic castration-resistant prostate cancer (mCRPC) and improves median PFS compared to bicalutamide in men with mCRPC (15.7 vs 5.8 mos; HR 0.44; p 0% by IHC; NCT01889238). Pts could be prescreened for AR, and have non-measurable bone disease and unlimited prior regimens; CNS metastases or seizure history were exclusionary. The primary endpoint was clinical benefit (CR, PR or SD) at 16 wks (CBR16) in ‘Evaluable’ pts defined as having both AR IHC ≥10% and a response assessment. CBR24, PFS, response rate, and safety were assessed. An androgen-driven gene signature (Dx) was created from gene profiling and outcomes were assessed accordingly. Stage 2 enrolled if CBR16 was ≥3 of 26 Evaluable pts; H0 was rejected if CBR16 was ≥9 in 62 yielding 85% po...
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