1. Division of Pathology, Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, Kashiwa, Chiba, Japan
2. Department of Gastroenterology and Gastrointestinal Oncology, National Cancer Center Hospital East, Kashiwa, Chiba, Japan
3. Department of Medical Oncology, Graduate School of Medicine, Chiba University, Chuo-ku, Chiba, Japan
4. Department of Experimental Therapeutics, Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, Tokyo, Japan
5. Department of Esophageal Surgery, National Cancer Center Hospital East, Kashiwa, Chiba, Japan
6. Biostatistics Division, Center for Research Administration and Support, National Cancer Center, Kashiwa, Japan
7. Exploratory Oncology Research and Clinical Trial Center, National Cancer Center, Kashiwa, Japan