1. Department of Musculoskeletal Surgery Fudan University Shanghai Cancer Center Department of Oncology Shanghai Medical College Fudan University Shanghai 200032 P. R. China
2. Department of Bone and Soft Tissue Tumors Tianjin Medical University Cancer Hospital and Institute Tianjin 300060 China
3. National Clinical Research Center for Cancer Tianjin Medical University Cancer Hospital and Institute Tianjin 300060 P. R. China
4. Department of Bone and Soft‐tissue Surgery Zhejiang Cancer Hospital Hangzhou Zhejiang 310022 P. R. China
5. Department of General Surgery Brandon Regional Hospital HCA West Florida Division Brandon 33511 USA
6. Academic Unit of Clinical Oncology University of Nottingham City Hospital Campus Nottingham NG5 1PB UK