Primary Objective~To evaluate the pathological complete response rate (pCR) of nivolumab combined with SOX (oxaliplatin + S-1) for neoadjuvant therapy of resectable gastric and gastroesophageal junction adenocarcinoma; Secondary Objectives~To evaluate the major pathological response rate (mPR), R0 resection rate, lymph node status after neoadjuvant therapy (ypN stage), 3-yr-DFS, OS, and safety and tolerability of nivolumab combined with SOX in the periopera
To evaluate the pathological complete response rate (pCR) of nivolumab combined with SOX (oxaliplatin + S-1) for neoadjuvant therapy of resectable gastric and gastroesophageal junction adenocarcinoma;