Rucaparib Plus Ramucirumab With or Without Nivolumab in Advanced Gastric and Esophageal Adenocarcinoma

The study population is advanced gastric, gastroesophageal, and esophageal adenocarcinoma participants who have failed upfront standard of care chemotherapy. The goal is to demonstrate that Rucaparib plus Ramucirumab with or without Nivolumab has a higher response rate than what has been reported for Ramucirumab in previously treated patients. Trial will be a phase 1/2 trial. The Phase 1 portion will determine the recommended Phase 2 treatment dose for the combination of Rucaparib plus Ramucirumab and Nivolumab and enroll approximately 6-9 participants. The Phase 2 portion of the study will involve 52 participants allocated between two treatment groups comparing Rucaparib plus Ramucirumab with or without Nivolumab. The participants will be selected based on the results of a screening HRD gene panel.