^○Takashi Ogata¹, Yuichiro Doki², Ken Kato³, Satoru Motoyama⁴, Hisato Kawakami⁵, Masaki Ueno⁶, Takashi Kojima⁷, Toshiyoshi Fujiwara⁸, Morihito Okada⁹, Ryu Ishihara¹⁰, Yutaro Kubota¹¹, Xynos Ioannis¹², Yasuhiro Matsumura¹³, Yuko Kitagawa¹⁴ (1.Kanagawa Cancer Center, 2.Osaka University Graduate School of Medicine, 3.National Cancer Center Hospital, 4.Akita University Graduate School of Medicine, 5.Kindai University Faculty of Medicine, 6.Toranomon Hospital, 7.National Cancer Center Hospital East, 8.Okayama University Hospital, 9.Hiroshima University Hospital, 10.Osaka International Cancer institute, 11.Showa University Hospital, 12.Bristol-Myers Squibb, 13.ONO Pharmaceutical Company Ltd., 14.Keio University School of Medicine)

^○Ken Kato¹, Yoshinori Ito², Daiko Hiroyuki³, Soji Ozawa⁴, Takashi Ogata⁵, Hiroki Hara⁶, Takashi Kojima⁷, Tetsuya Abe⁸, Takeo Bamba⁹, Masaya Watanabe¹⁰, Hirofumi Kawakubo¹¹, Yuichi Shibuya¹², Takahiro Tsushima¹³, Naoki Takegawa¹⁴, Takeshi Kajiwara¹⁵, Hideo Baba¹⁶, Masaki Ueno¹⁷, Ryunosuke Machida¹⁸, Kenichi Nakamura¹⁸, Yuko Kitagawa¹¹ (1.Department of Head and Neck, Esophageal Medical Oncology, 2.Department of Radiation Oncology, Showa University School of Medicine, 3.Department of Esophageal Surgery, National Cancer Center Hospital, 4.Department of Gastroenterological Surgery, Tokai University School of Medicine, 5.Department of Gastrointestinal Surgery, Kanagawa Cancer Center, 6.Department of Gastroenterology, Saitama Cancer Center, 7.Department of Gastroenterology and Gastrointestinal Oncology, National Cancer Center Hospital East, 8.Department of Gastroenterological Surgery, Aichi Cancer Center Hospital, 9.Department of Gastroenterological Surgery, Niigata Cancer Center Hospital, 10.Department of Gastroenterological Surgery, Shizuoka General Hospital, 11.Department of Surgery, Keio University School of Medicine, 12.Department of Gastroenterological Surgery, Kochi Health Science Center, 13.Division of Gastrointestinal Oncology, Shizuoka Cancer Center Hospital, 14.Department of Gastroenterological Oncology, Hyogo Cancer Center, 15.Department of Gastrointestinal Medical Oncology, National Hospital Organization Shikoku Cancer Center, 16.Department of Gastroenterological Surgery, Graduate School of Medical Sciences Kumamoto University, 17.Department of Gastroenterological Surgery, Toranomon Hospital, 18.Japan Clinical Oncology Group Data Center/Operations Office, National Cancer Center Hospital)

^○Yoshiaki Nakamura¹, Yuichiro Tsukada², Tatsuro Murano³, Nobuhisa Matsuhashi⁴, Manabu Shiozawa⁵, Takeshi Kato⁶, Eiji Oki⁷, Masahiro Goto⁸, Yoshinori Kagawa⁹, Akiyoshi Kanazawa¹⁰, Takashi Ohta¹¹, Akira Ouchi¹², Hideaki Bando¹, Xiaotong Zuo¹³, Princy Parsana¹³, Kristin Price¹³, Hiroaki Ikematsu³, Takayuki Yoshino¹ (1.Department of Gastroenterology and Gastrointestinal Oncology, National Cancer Center Hospital East, 2.Department of Colorectal Surgery, National Cancer Center Hospital East, 3.Department of Gastroenterology and Endoscopy, National Cancer Center Hospital East, 4.Department of Surgical Oncology, Graduate School of Medicine, Gifu University Hospital, 5.Department of Gastroenterological Surgery, Kanagawa Cancer Center, 6.Department of Surgery, National Hospital Organization Osaka National Hospital, 7.Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University Hospital, 8.Cancer Chemotherapy Center, Osaka Medical and Pharmaceutical University Hospital, 9.Department of Gastroenterological Surgery, Osaka General Medical Center, 10.Department of Surgery, Shimane Prefectural Central Hospital, 11.Department of Clinical Oncology, Kansai Rosai Hospital, 12.Department of Gastroenterological Surgery, Aichi Cancer Center, 13.Guardant Health Inc)

^○Atsuo Takashima¹, Tetsuya Hamaguchi², Junki Mizusawa³, Shimada Yasuhiro⁴, Fumio Nagashima⁵, Masahiko Ando⁶, Shu Okamura⁷, Manabu Shimomura⁸, Kenji Katsumata⁹, Manabu Shiozawa¹⁰, Yasumasa Takii¹¹, Akio Shiomi¹², Satoshi Ootsu¹³, Tohru Funakoshi¹⁴, Rei Hirata¹⁵, Tetsu Yamamoto¹⁶, Masahito Kotaka¹⁷, Hiroshi Katayama³, Kenichi Nakamura³, Yukihide Kanemitsu¹⁸ (1.Department of Gastrointestinal Medical Oncology, National Cancer Center Hospital, 2.Saitama Medical University International Medical Center, 3.JCOG Data Center/Operations Office, 4.Kochi Health Sciences Center, 5.Kochi Health Sciences Center, 6.Nagoya University Hospital, 7.Suita Municipal Hospital, 8.Hiroshima City Asa Citizens Hospital, 9.Tokyo Medical University Hospital, 10.Kanagawa Cancer Center, 11.Niigata Cancer Center Hospital, 12.Shizuoka Cancer Center, 13.Oita University Hospital, 14.Sapporo Kosei General Hospital, 15.Hiratsuka City Hospital, 16.Shimane University Hospital, 17.Sano Hospital, 18.Department of Colorectal Surgery, National Cancer Center Hospital)

^○Akiko Todaka¹, Kohei Nakachi², Masafumi Ikeda³, Masaru Konishi⁴, Shogo Nomura⁵, Hiroshi Katayama⁶, Tomoko Kataoka⁶, Hiroaki Yanagimoto⁷, Soichiro Morinaga⁸, Hiroshi Wada⁹, Kazuaki Shimada¹⁰, Yu Takahashi¹¹, Toshio Nakagori¹², Kunihito Gotoh¹³, Ken Kamata¹⁴, Yasuhiro Shimizu¹⁵, Makoto Ueno¹⁶, Hiroshi Ishii¹⁷, Takuji Okusaka¹⁸, Junji Furuse¹⁹ (1.Division of Gastrointestinal Oncology, Shizuoka Cancer Center, 2.Department of Gastroenterology, Tochigi Cancer Center, 3.Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital East, 4.Department of Hepatobiliary and Pancreatic Surgery, National Cancer Center Hospital East, 5.Japan Clinical Oncology Group Data Center, Clinical Research Support Office, National Cancer Center Hospital, 6.Japan Clinical Oncology Group Operations Office, Clinical Research Support Office, National Cancer Center Hospital, 7.Department of Surgery, Kansai Medical University, 8.Department of Heapto-Biliary and Pancreatic Surgery, Kanagawa Cancer Center, 9.Department of Gastroenterological Surgery, Osaka International Cancer Institute, 10.Department of Hepatobiliary and Pancreatic Surgery, National Cancer Center Hospital, 11.Division of Hepatobiliary and Pancreatic Surgery, Cancer Institute Hospital of the Japanese Foundation for Cancer Research, 12.Department of Gastroenterological Surgery, Tokai University School of Medicine, 13.Department of Surgery, National Hospital Organization Osaka National Hospital, 14.Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, 15.Department of Gastroenterological Surgery, Aichi Cancer Center Hospital, 16.Department of Gastroenterology, Hepatobiliary and Pancreatic Medical Oncology Division, Kanagawa Cancer Center, 17.Gastrointestinal Medical Oncology, Chiba Cancer Center, 18.Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital, 19.Department of Medical Oncology, Kyorin University Faculty of Medicine)