Estudio de pembrolizumab más quimioterapia frente a placebo más quimioterapia en participantes con adenocarcinoma gástrico o de la unión gastroesofágica
The purpose of this study is to evaluate the efficacy of pembrolizumab (MK-3745) in the neoadjuvant (prior to surgery) or adjuvant (after surgery) treatment of previously untreated adults with gastric and