To evaluate the efficacy of nivolumab plus TG4010 (modified vaccinia virus Ankara [MVA]-human mucin 1 [MUC1]-interleukin-2 [IL2] vaccine) in previously treated patients with stage IV non squamous non-small cell lung cancer (NSCLC) with respect to objective response rate (ORR) by Response Evaluation Criteria in Solid Tumors (RECIST) 1.1.