1. The Center for Digestive Diseases, KKR Sapporo Medical Center Tonan Hospital, Japan
2. Department of Gastrointestinal Oncology, National Cancer Center Hospital East, Japan
3. Pathology Division, KKR Sapporo Medical Center Tonan Hospital, Japan
4. Hematology Division, KKR Sapporo Medical Center Tonan Hospital, Japan
5. Department of Experimental Therapeutics, National Cancer Center Hospital East, Japan