atezolizumab, PD-L1 inhibitor, IPSOS, elderly, Eastern Cooperative Oncology Group performance status (ECOG PS), non-small cell lung cancer (NSCLC), phase III, overall survival, chemotherapy, first-line, gemcitabine, vinorelbine, platinum-ineligible
NSCLC, ECOG performance status 3, poor performance status, chemotherapy-ineligible, erlotinib, best supportive care, randomised trial