1Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital, 5-1-1 Tsukiji, Chuo-ku, Tokyo, 104-0045 Japan
2Division of Cancer Genomics, National Cancer Center Research Institute, Tokyo, Japan
3Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital East, Kashiwa, Japan
4Department of Gastroenterology, Hepatobiliary and Pancreatic Medical Oncology Division, Kanagawa Cancer Center, Kanagawa, Japan
5Department of Oncology Center, Yamaguchi University Hospital, Yamaguchi, Japan
6Department of Gastroenterology, National Hospital Organization Takasaki General Medical Center, Gunma, Japan
7Department of Hepato-Biliary-Pancreatology, National Hospital Organization Kyushu Cancer Center, Fukuoka, Japan
8Department of Gastroenterology, Aichi Cancer Center Hospital, Aichi, Japan
9Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan
10Department of Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
11Department of Therapeutic Oncology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
12Department of Gastrointestinal Medical Oncology, National Hospital Organization Shikoku Cancer Center, Ehime, Japan
13Department of Gastroenterology, Saitama Cancer Center, Saitama, Japan
14Department of Surgery, National Hospital Organization Osaka National Hospital, Osaka, Japan
15Department of Medical Oncology, Tochigi Cancer Center, Tochigi, Japan
16Department of Gastroenterology, Kofu Municipal Hospital, Yamanashi, Japan
17Department of Gastroenterology, National Center for Global Health and Medicine, Tokyo, Japan
18Department of Medical Oncology, Kyorin University Faculty of Medicine, Tokyo, Japan
19Department of Clinical Oncology, St.Marianna University School of Medicine, Kanagawa, Japan
20Kyoto Innovation Center for Next Generation Clinical Trials and iPS Cell Therapy, Kyoto University Hospital, Kyoto, Japan
21Division of Gastroenterology, Chiba Cancer Center, Chiba, Japan
22Department of Oncology Division, Yokohama City University School of Medicine, Kanagawa, Japan
23Department of Biostatistics, Yokohama City University Graduate School of Medicine, Kanagawa, Japan