Liu SV, Reck M, Mansfield AS, Mok T, et al. Updated Overall Survival and PD-L1 Subgroup Analysis of Patients With
Extensive-Stage Small-Cell Lung Cancer Treated With Atezolizumab, Carboplatin,
and Etoposide (IMpower133). J Clin Oncol 2021 Jan 13:JCO2001055. doi: 10.1200/JCO.20.01055.
PMID: 33439693