1. Division of Gastrointestinal Oncology; Shizuoka Cancer Center; Shizuoka Japan
2. Department of Clinical Oncology; Aichi Cancer Center Hospital; Aichi Japan
3. Department of Gastrointestinal Oncology; National Cancer Center Hospital East; Kashiwa Japan
4. Division of Molecular Diagnosis and Cancer Prevention; Saitama Cancer Center; Saitama Japan
5. Department of Digestive Tract and General Surgery; Saitama Medical Center; Saitama Medical University; Saitama Japan
6. Division of Medical Oncology; Cancer Research Institute; Kanazawa University; Ishikawa Japan
7. Central Laboratory; Mie University Hospital; Mie Japan
8. Department of Pathology and Molecular Diagnostics; Aichi Cancer Center Hospital; Aichi Japan
9. Department of Gastroenterological Chemotherapy; Cancer Institute Hospital of Japanese Foundation for Cancer Research; Tokyo Japan
10. Division of Translational Research; Exploratory Oncology Research and Clinical Trial Center; National Cancer Center; Chiba Japan