“…A total of 3,691 related studies were identified by the initial search strategy ( Figure S1). Finally, 20 randomized controlled trails with 22 studies involving 12,025 patients were included for the quantitative analysis (Barlesi et al, 2018;Borghaei et al, 2015;Borghaei et al, 2018;Brahmer et al, 2015;Carbone et al, 2017;Fehrenbacher et al, 2016;Gandhi et al, 2018;Govindan et al, 2017;Hellmann et al, 2018;Herbst et al, 2016;Jotte et al, 2018;Langer et al, 2016;Lynch et al, 2012;Mok et al, 2019;Papadimitrakopoulou et al, 2018;Paz-Ares et al, 2018;Reck et al, 2016;Rittmeyer et al, 2017;Socinski et al, 2018;West et al, 2019;Wu et al, 2019). Half of these 22 studies investigated the efficacy of ICI monotherapy versus chemotherapy, including 1 study about avelumab, 2 about ATE, 4 about NIV, and 4 about PEM.…”