Estudo de pembrolizumabe mais quimioterapia em participantes com adenocarcinoma gástrico ou da junção gastroesofágica (JGE)
The purpose of this study is to evaluate the efficacy of pembrolizumab (MK-3745) in combination with chemotherapy (Cisplatin combined with 5-Fluorouracil [FP regimen] or oxaliplatin combined with capecitabine [CAPOX regimen]) versus