Study of Pembrolizumab (MK-3475) Versus Placebo in Participants With Esophageal Carcinoma Who Are Receiving Chemotherapy and Radiation Therapy (MK-3475-975/KEYNOTE-975) ~82 mi. (Quezon, Philippines, +126 more cities) St. Luke s Medical Center ( Site 0601) Adenocarcinoma of the Gastroesophageal Junction, +1 more condition FOLFOX regimen, +3 more drugs chemotherapy, +2 more types