A Phase III, Open-Label, Randomized Study to Investigate the Efficacy and Safety of Atezolizumab (Anti-PD-L1 Antibody) Compared With Best Supportive Care Following Adjuvant Cisplatin-Based Chemotherapy in Patients With Completely Resected Stage IB-IIIA Non-Small Cell Lung Cancer

This is a Phase III, global, multicenter, open-label, randomized study to compare the efficacy and safety of 16 cycles (1 cycle duration=21 days) of atezolizumab (MPDL3280A) treatment compared with best supportive care (BSC) in participants with Stage IB-Stage IIIA non-small cell lung cancer (NSCLC) following resection and adjuvant chemotherapy, as measured by disease-free survival (DFS) as assessed by the investigator and overall survival (OS). Participants, after completing up to 4 cycles of adjuvant cisplatin-based chemotherapy, will be randomized in a 1:1 ratio to receive atezolizumab for 16 cycles or BSC.