Cohorts 1 (C1) and 2 (C2) enrolled patients (pts) with RECIST-measurable PD-L1+ and PD-L1– disease, respectively….The response rate was numerically higher in pts with somatic BRCA1/2 or ATM mutations (12%)….Pembro shows antitumor activity and disease control with acceptable safety in pts with docetaxel-refractory mCRPC, regardless of PD-L1 status...