A Study of Zolbetuximab (IMAB362) Plus CAPOX Compared with Placebo Plus CAPOX as First-line Treatment of Subjects with Claudin (CLDN) 18.2-Positive, HER2-Negative, Locally Advanced Unresectable or Metastatic Gastric or Gastroesophageal Junction (GEJ) Adenocarcinoma

The purpose of this study is to evaluate the efficacy of zolbetuximab plus capecitabine and oxaliplatin (CAPOX) compared with placebo plus CAPOX (as first-line treatment) as measured by Progression Free Survival (PFS). This study will also evaluate efficacy, physical function, safety, and tolerability of zolbetuximab, as well as its effects on quality of life. Pharmacokinetics (PK) of zolbetuximab and the immunogenicity profile of zolbetuximab will be evaluated as well.