1. Department of Surgery, Kitasato University School of Medicine, 2-1-1 Asamizodai, Minami-ku, Sagamihara, Kanagawa, 252-0380, Japan 2. Department of Gastrointestinal Oncology, Kitasato University School of Medicine, Sagamihara, Japan 3. Department of Radiology and Radiation Oncology, Kitasato University School of Medicine, Sagamihara, Japan 4. Department of Pharmacy, Kitasato University School of Medicine, Sagamihara, Japan