Department of Gastrointestinal Surgery, Kanagawa Cancer Center Hospital, Yokohama, Japan. currently affiliated with Department of Gastric Surgery, National Cancer Center Hospital, Tokyo, Japan. Department of Clinical Oncology, Aichi Cancer Center Hospital, Nagoya, Japan. Department of Gastrointestinal Oncology, National Cancer Center Hospital East, Kashiwa, Japan. Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea. Department of Oncology, Asan Medical Center, University of Ulsan, Seoul, South Korea. Yonsei Cancer Center, Yonsei University College of Medicine, Seoul, South Korea. Osaka University Graduate School of Medicine, Osaka, Japan. currently affiliated with Osaka International Cancer Institute, Osaka, Japan. The Cancer Institute Hospital of the Japanese Foundation of Cancer Research, Tokyo, Japan. Keio University School of Medicine, Tokyo, Japan. Chiba Cancer Center, Chiba, Japan. currently affiliated with Oita University Faculty of Medicine, Oita, Japan. Graduate School of Medicine, Gifu University, Gifu, Japan. Department of Internal Medicine, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan, Taiwan. Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, Tokyo, Japan. Division of Hematology and Oncology, China Medical University Hospital, China Medical University, Taichung, Taiwan. Eli Lilly Japan KK, Kobe, Japan.