Recently, the FDA approved pembrolizumab (Keytruda®, Merck Sharp & Dohme Corp.) in combination with platinum/fluoropyrimidine-based chemotherapy for patients with metastatic or locally advanced esophageal or gastroesophageal junction (GEJ) carcinoma who do not qualify for surgical resection or definitive chemoradiation. The approval was based on the results of KEYNOTE-590, a phase 3 trial that demonstrated significant improvements in progression-free survival and overall survival for patient...