RecruitingPhase 2Drug trialA Study of Novel Agents or Combinations as Perioperative Treatment in Participants With Locally Advanced Resectable Gastroesophageal AdenocarcinomaGEMINI-PeriOp GC study will assess the safety, tolerability, pharmacokinetics (PK) and preliminary anti-tumor activity of novel agents or novel combinations as perioperative treatment in participants with locally advanced resectable gastric, gastroesophageal junction (GEJ), or esophageal adenocarcinoma who have not received previous treatment for the disease.