Nivolumab treatment of elderly Japanese patients with non-small cell lung cancer: subanalysis of a real-world retrospective observational study (CA209-9CR) oleh Hiroshi Tanaka, Hiroyuki Suzuki, Junichi Shimizu, Daichi Fujimoto, Toshiyuki Kozuki, Osamu Hataji, Kyoichi Okishio, Ryo Morita, Haruhiro Saito, Hiroshi Sakai, Young Hak Kim, Makiko Yomota, Makoto Nishio, Keisuke Aoe, Osamu Kanai, Toru Kumagai, Kayoko Kibata, Hiroaki Tsukamoto, Satoshi Oizumi, Keiko Mizuno, Takeshi Masuda, Takashi Haku, Isamu Okamoto, Hirotoshi Hoshiyama, Nobumichi Yada, Yuichiro Ohe