High Incidence of C797S Mutation in Patients With Long Treatment History of EGFR Tyrosine Kinase Inhibitors Including Osimertinib oleh Atsushi Osoegawa, MD, PhD, Masafumi Yamaguchi, MD, PhD, Tomomi Nakamura, MD, PhD, Ryotaro Morinaga, MD, Kentaro Tanaka, MD, PhD, Kosuke Kashiwabara, MD, PhD, Takashi Miura, MD, PhD, Takayuki Suetsugu, MD, PhD, Taishi Harada, MD, PhD, Tatsuma Asoh, MD, PhD, Kenichi Taguchi, MD, PhD, Kazuki Nabeshima, MD, PhD, Junji Kishimoto, MA, Kazuko Sakai, PhD, Kazuto Nishio, MD, PhD, Kenji Sugio, MD, PhD