This study is a randomized, controlled, open-label phase III clinical trial, aims to compare the efficacy and safety of Retlirafusp alfa injection plus CAPOX versus the investigator's choice of anti-PD-1 antibody plus CAPOX as first-line treatment in patients with advanced gastric cancer (GC) or gastroesophageal junction cancer (GEJC) with liver metastases
1. Age ≥ 18 years; 2. Patients with recurrent or previously untreated advanced gastric or gastroesophageal junction cancer with liver metastases, histopathologically confirmed as adenocarcinoma.
1. Known gastric cancer of squamous cell carcinoma, undifferentiated carcinoma, or other histological types, or adenocarcinoma mixed with other histological types.