RecruitingPhase 2Drug trialPerioperative Disitamab Vedotin Plus Toripalimab and XELOX in Gastric or Gastroesophageal Junction Adenocarcinoma.The purpose of this study is to evaluate the efficacy and safety of perioperative Disitamab Vedotin plus Toripalimab and XELOX versus Disitamab Vedotin plus Toripalimab versus XELOX in subjects with HER2-expressing resectable locally advanced gastric or gastroesophageal junction adenocarcinoma.