Study of Pembrolizumab (MK-3475) Versus Placebo in Participants With Esophageal Carcinoma Who Are Receiving Chemotherapy and Radiation Therapy (MK-3475-975/KEYNOTE-975) ~97 mi. (Iligan City, Philippines, +126 more cities) The Medical City-Iloilo ( Site 0602) Adenocarcinoma of the Gastroesophageal Junction, +1 more condition FOLFOX regimen, +3 more drugs chemotherapy, +2 more types