1. Department of Bone and Soft Tissue TumorsTianjin Medical University Cancer Institute and Hospital Tianjin 300060 P. R. China
2. National Clinical Research Center for CancerKey Laboratory of Cancer Prevention and TherapyTianjin's Clinical Research Center for CancerTianjin Medical University Cancer Institute and Hospital Tianjin 300060 P. R. China
3. Department of OrthopedicsAffiliated Hospital of Chengde Medical College Chengde Hebei 067000 P. R. China
4. Department of PathologyTianjin Medical University Cancer Institute and Hospital Tianjin 300060 P. R. China
5. International Medical SchoolTianjin Medical University Tianjin 300061 P. R. China