Y Sunakawa1, A Tsuji2, M Fujii3, W Ichikawa4. 1. Division of Medical Oncology, Showa University Northern Yokohama Hospital, Tsuzuki-ku, Yokohama, Kanagawa. 2. Department of Clinical Oncology, Kagawa University Faculty of Medicine Cancer Center, Kagawa University Hospital, Miki-cho, Kita-gun, Kagawa. 3. Department of Digestive Surgery, Nihon University School of Medicine, Itabashi-ku, Tokyo. 4. Division of Medical Oncology, Showa University Fujigaoka Hospital, Aoba-ku, Yokohama, Kanagawa, Japan.