Adverse Event Form Participant ID: ____ P. I. name: Dr. Priya Gopalan PhD, MD Site ID: ___ Name of the Protocol: An open-label, multicenter phase II study to compare the efficacy of carboplatin as first-line followed by second-line olaparib versus olaparib as firstline followed by second-line carboplatin in the treatment of patients with castration resistant prostate cancer containing homologous recombination deficiency Protocol ID: COBRA Severity 1 = Mild 2 = Moderate 3 = Severe 4 = LifeThreatening 5 = Death Relation to Investigational Drug 0 = definitely Not related 1 = Possibly related 2 = Probably related 3 = Definitely related Action Taken with Investigational Drug 0 = None 1= Injection Interrupted Treatment Required Outcome of AE 1 = Recovered 2 = Recovered with sequelae 3 = Recovering 4 = Not Recovered 5 = Fatal 1= Yes 2= No Serious Adverse Event (SAE) 1 = Yes 2 = No (If yes, complete SAE form) At end of the study only: Check the box if the participant had no adverse events ☐ Adverse Event Start Date Stop Date Signature of the person performing the documentation Signature and the Principal Investigator Version 1.1 C/S 06/09/2021 Severity Relatio nship Action Taken Treatment required Outcome of AE SAE? Adverse Event Form Participant ID: ____ P. I. name: Dr. Priya Gopalan PhD, MD Site ID: ___ Name of the Protocol: An open-label, multicenter phase II study to compare the efficacy of carboplatin as first-line followed by second-line olaparib versus olaparib as firstline followed by second-line carboplatin in the treatment of patients with castration resistant prostate cancer containing homologous recombination deficiency Protocol ID: COBRA Version 1.1 C/S 06/09/2021