Phase Ib/II Study to Evaluate the Safety and Efficacy of Nivolumab in Combination With Paclitaxel in Epstein-Barr Virus(EBV)-Related, or Microsatellite Instability-High (MSI-H), or Programmed Cell Death Ligand 1 (PD-L1) Positive Advanced Gastric Cancer

Increasing dose levels of paclitaxel (70 mg/m2 or 80 mg/m2 on Days 1, 8 and 15 of a 28-day treatment cycle) in combination with a fixed dose of nivolumab (3 mg/kg on Days 1 and 15 of a 28-day treatment cycle) will be explored using a 3+3 design to evaluate the safety and tolerability and to determine a MTD.