1. Division of Haematology/Oncology, Department of Internal Medicine, Kameda Medical Centre, Chiba, Japan
2. Division of Oncology, Department of Internal Medicine, Kameda Medical Centre, Chiba, Japan
3. Division of Pathology, The Cancer Institute, Japanese Foundation for Cancer Research, Tokyo, Japan
4. Department of Pathology, The Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo, Japan