An Open-Label, Single-Arm, Phase 2 Study to Evaluate the Efficacy and Safety of Tislelizumab Plus Chemotherapy in a First-Line Setting for Locally Advanced Unresectable or Metastatic Gastric or Gastroesophageal Adenocarcinoma and Esophageal Squamous Cell Carcinoma in US Racial and Ethnic Minority Patients

The purpose of this study is to characterize the clinical effects of tislelizumab, including pharmacokinetics (PK), activity, and safety assessments in US racial and ethnic minority patients with human epidermal growth factor receptor 2 (HER2)-negative, programmed death-ligand 1(PD-L1)-positive, unresectable or metastatic gastric or gastroesophageal cancer (GAC/GEA) or esophageal squamous cell carcinoma (ESCC). The study duration will be up to approximately 6 years.

Drug: Tislelizumab, Drug: 5-fluorouracil (5-FU), Drug: Oxaliplatin, Drug: Leucovorin