1. Department of Gastroenterology and Gastrointestinal Oncology; National Cancer Center Hospital East; Kashiwa Chiba Japan
2. Division of Pathology; Exploratory Oncology Research and Clinical Trial Center; National Cancer Center; Kashiwa Chiba Japan
3. Department of Medical Oncology; Graduate School of Medicine; Chiba University; Chuo-ku Chiba Japan
4. Department of Esophageal Surgery; National Cancer Center Hospital East; Kashiwa Chiba Japan
5. Department of Digestive Endoscopy; National Cancer Center Hospital East; Kashiwa Chiba Japan
6. Exploratory Oncology Research and Clinical Trial Center; National Cancer Center; Kashiwa Chiba Japan