Safety and efficacy of pembrolizumab monotherapy in elderly patients with PD-L1 positive advanced non small-cell lung cancer: Pooled analysis from the KEYNOTE-010, KEYNOTE-024, and KEYNOTE-042 studies - Nosaki, Kaname; Saka, Hideo; Hosomi, Yukio; Baas, Paul; Castro Junior, Gilberto de Castro; Reck, Martin; Wu, Yi-Long; Brahmer, Julie R; Felip, Enriqueta; Sawada, Takeshi (Lung cancer, 2019)