P234 Differentiation of histopathological features between sporadic and colitis-associated colorectal cancer in a nationwide large cohort.

Uchino, M.(1)*;Ikeuchi, H.(2);Noiguchi, T.(3);Okabayashi, K.(4);Futami, K.(5);Tanaka, S.(6);Ohge, H.(7);Watanabe, K.(8);Itabashi, M.(9);Okamoto, K.(10);Okita, Y.(11);Mzushima, T.(12);Mizuuchi, Y.(13);Yamada, K.(14);Shimada, Y.(15);Sato, Y.(16);Kimura, H.(17);Takahashi, K.(18);Hida, K.(19);Kinugasa, Y.(20);Okuda, J.(21);Daito, K.(22);Koyama, F.(23);Ueno, H.(24);Yamamoto, T.(25);Hanai, T.(26);Kobayashi, H.(27);Kono, T.(28);Ajioka, Y.(29);Sugihara, K.(30);Ishihara, S.(3);

(1)Hyogo College of Medicine, Department of Inflammatory Bowel Disease, Nishinomiya, Japan;(2)Hyogo medical University, gastroenterological surgery, Nishinomiya, Japan;(3)The University of Tokyo, Surgical Oncology, Tokyo, Japan;(4)Keio University School of Medicine, Surgery, Tokyo, Japan;(5)Fukuoka University Chikushi Hospital, Surgery, Fukuoka, Japan;(6)Hiroshima University Hospital, Endoscopy, Hiroshima, Japan;(7)Hiroshima University Hospital, Infectious Diseases, Hiroshima, Japan;(8)Tohoku University Graduate School of Medicine, Surgery, Sendai, Japan;(9)Tokyo Women's Medical University, Surgery, Tokyo, Japan;(10)Tokyo Yamate Medical Center, Coloproctology, Tokyo, Japan;(11)Mie University Graduate School of Medicine, Gastrointestinal and Pediatric Surgery- Institute of Life Sciences, Tsu, Japan;(12)Osaka University, Gastroenterological Surgery, Osaka, Japan;(13)Kyushu University, Surgery and Oncology, Fukuoka, Japan;(14)Coloproctology Center Takano Hospital, Surgery, Kumamoto, Japan;(15)Graduate School of Medical and Dental Sciences- Niigata University, Digestive and General Surgery, Niigata, Japan;(16)Toho University Sakura Medical Center, Surgery, Chiba, Japan;(17)Yokohama City University Medical Center, Inflammatory Bowel Disease Center, Yokohama, Japan;(18)Tohoku Rosai Hospital, Colorectal Surgery, Sendai, Japan;(19)Kyoto University Hospital, Surgery, Kyoto, Japan;(20)Tokyo Medical and Dental University, Gastrointestinal Surgery, Tokyo, Japan;(21)Osaka Medical and Pharmaceutical University, General and Gastroenterological Surgery, Osaka, Japan;(22)Kindai University- Faculty of Medicine, Surgery, Osaka, Japan;(23)Nara Medical University, Surgery, Nara, Japan;(24)National Defense Medical College, Surgery, Tokorozawa, Japan;(25)Yokkaichi Hazu Medical Center, Inflammatory Bowel Disease Center, Yokkaichi, Japan;(26)Fujita Health University- School of Medicine, Surgery, Toyoake, Japan;(27)Teikyo University Mizonokuchi Hospital, Surgery, Kanagawa, Japan;(28)Sapporo Higashi Tokushukai Hospital, Advanced Surgery Center, Sapporo, Japan;(29)Graduate School of Medical and Dental Sciences- Niigata University, Molecular and Diagnostic Pathology, Niigata, Japan;(30)Tokyo Medical and Dental University, Surgery, Tokyo, Japan; Study Group for Inflammatory Bowel Disease Associated Intestinal Cancers by the Japanese Society for Cancer of the Colon and Rectum