PO-1173 Previous pneumectomy is a risk factor of severe radiation pneumonitis after IMRT for lung cancer. (August 2021) - Tatsuno, S.; Doi, H.; Okada, W.; Inoue, E.; Nakamura, K.; Sano, K.; Wada, Y.; Uehara, T.; Inada, M.; Nakamatsu, K.; Monzen, K.; Hosono, M.; et al.