Estudio de pembrolizumab más quimioterapia en participantes con adenocarcinoma gástrico o de la unión gastroesofágica (UGE)
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