This is an open label phase II study to determine the safety and preliminary efficacy of the combination of 1-year of adjuvant trastuzumab deruxtecan and nivolumab for patients with HER2 overexpressing esophagogastric adenocarcinoma who have completed chemoradiation followed by esophagectomy. All patients will receive trastuzumab deruxtecan, 6.4 mg/kg IV, and nivolumab, 360 mg IV, every 21 days, for 17 doses over 1 year.
An open label phase II study to determine the safety and preliminary efficacy of the combination of 1-year of adjuvant trastuzumab deruxtecan and nivolumab for patients with HER2 overexpressing esophagogastric adenocarcinoma who have completed chemoradiation followed by esophagectomy.