1. Department of Bone and Soft Tissue Tumor and Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, People's Republic of China
2. National Clinical Research Center of Cancer, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, People's Republic of China
3. Department of Diagnostics, Tianjin Medical University, Tianjin 300061, People's Republic of China
4. Department of Epidemiology and Biostatistics, Tianjin Medical University Cancer Institute and Hospital, Tianjin 300060, People's Republic of China
5. Department of Pathology, The University of Texas MD Anderson Cancer Center, Houston, TX, 77030 USA