48 pts with mCRPC and high PSMA expression...Across cohorts 1-9, the PSA50-RR was 62% (18/29) and PSA90-RR was 48% (14/29). Five of the 7 pts (71%) with RECIST measurable disease had a partial response….The combination of 177Lu-PSMA-617 and olaparib is well tolerated and has promising activity.