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LBA4518 Background: AA is an androgen biosynthesis inhibitor that inhibits CYP17 and improves overall survival (OS) in post-docetaxel mCRPC. The primary objective of COU-AA-302 was to compare clinical benefit of AA + prednisone (P) vs placebo (PL) + P in chemo-naive, asymptomatic/mildly symptomatic mCRPC pts. Methods: 1088 pts (151 centers; 12 countries) were randomized 1:1 to AA (1 g) + P (5 mg BID) or PL + P. Co-primary endpoints: radiographic progression-free survival (rPFS) and OS. Median times estimated using K-M method including LR statistic for inference. The Lan-DeMets α-spending function was used for OS. Results:The Independent Data Monitoring Committee concluded that the OS, rPFS and secondary endpoints (Table) all favored the AA arm and unanimously recommended unblinding the study and crossing pts from PL to AA at IA (43% of total events). Median follow up = 22.2 mos. Grade 3/4 AEs (AA + P, PL + P) (%): hypertension 3.9 vs 3.0; hypokalemia 2.4 vs 1.9; ALT↑ 5.4 vs 0.7; AST↑ 3.0 vs 0.9. Conclusions:AA + P produced a statistically significant improvement in rPFS and a strong trend for increased OS at this IA. AA resulted in clinically and statistically significant effects on all secondary endpoints. IA results confirmed the acceptable tolerability/safety profile of AA. This is the first randomized trial to demonstrate both OS and rPFS benefits in chemo-naive mCRPC and that inhibition of persistent extragonadal androgen synthesis significantly delays initiation of cytotoxic chemo. While median OS (AA arm) has not been reached, median PL arm OS (27.2 mos) is the longest measured in any phase III mCRPC study. [Table: see text]

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Background: There is no standard treatment for mUM. A high-throughput genomic and transcriptomic program was initiated to uncover potential targets and assign molecularly guided treatment to this "hard-to-treat" tumor.Methods: From March 2016 to November 2019 mUM patients were included in the prospective Treat20Plus study and tumor was analyzed via a comprehensive molecular tumor analysis program. A molecular tumor board interpreted the data and issued treatment recommendations.

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