Hirotaka Okamoto1, Toshiyuki Kusama, Hideki Fujii. 1. Department of Gastrointestinal Breast & Endocrine Surgery University of Yamanashi Faculty of Medicine Chuo, Japan Department of Surgery Tsuru Municipal Hospital Tsuru, Japan hirotaka@yamanashi.ac.jp Department of Gastrointestinal Breast & Endocrine Surgery University of Yamanashi Faculty of Medicine Chuo, Japan Department of Medical Oncology Shinko Hospital Kobe, Japan Department of Gastrointestinal Breast & Endocrine Surgery University of Yamanashi Faculty of Medicine Chuo, Japan.