1. Division of Molecular and Cellular Medicine, National Cancer Center Research Institute, Tokyo 104-0045, Japan.
2. Department of Pathology and Clinical Laboratories, National Cancer Center Hospital, Tokyo 104-0045, Japan.
3. Department of Pathology, National Defense Medical College, Saitama 359-0042, Japan.
4. Breast and Medical Oncology Division, National Cancer Center Hospital, Tokyo 104-0045, Japan.