P-261Poor prognosis of hypermutant colorectal cancer with KRAS mutations: A retrospective analysis of 1, 052 Japanese colorectal cancer patients without treatment of immuno-checkpoint inhibitors. (2nd July 2019) - Nagasaka, T; Tanioka, H; Nyuya, A; Katata, Y; Okawaki, M; Yamamura, M; Kawai, T; Yasui, K; Toshima, T; Mori, Y; Umeda, Y; Tsuruta, A; et al.