HCRN GI17-319 was a multicenter, single-arm, phase II clinical trial with a prespecified 6-subject safety run-in of avelumab, trastuzumab, and mFOLFOX6 in previously untreated, metastatic, HER2-amplified gastric and esophageal adenocarcinomas (NCT03783936)....The 24-week response rate was 11/18 (61%; 95% CI 39-84%), including one complete response. The confirmed overall response rate is 7/18 (39%), but 3 unconfirmed responders are still on treatment.