Efficacy and Safety of Pembrolizumab or Pembrolizumab Plus Chemotherapy vs Chemotherapy Alone for Patients With First-line, Advanced Gastric Cancer Christian Caglevic , Luis J. Villanueva-Rivera , Eray Goekkurt +25 more ClinicalTrials.gov Identifier: NCT02494583. 2020 JAMA Oncology 1036 citations