1. Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, Tokyo 113‑8655, Japan
2. Division of Carcinogenesis, The Cancer Institute, Japanese Foundation for Cancer Research, Tokyo 135‑8550, Japan
3. Department of Pathology, The Cancer Institute Hospital of The Japanese Foundation for Cancer Research, Tokyo 135‑8550, Japan
4. Department of Pathology, The University of Tokyo, Tokyo 113‑8655, Japan
5. Department of Orthopedic Oncology, The Cancer Institute Hospital of The Japanese Foundation for Cancer Research, Tokyo 135‑8550, Japan