1. School of Life Sciences, Lanzhou University, Lanzhou 730000, China
2. Lanzhou University Second Hospital, Lanzhou 730000, China
3. Department of Pathology, Lanzhou University Second Hospital, Lanzhou 730000, China
4. The Key Laboratory of the Digestive System Tumors of Gansu Province, Lanzhou University Second Hospital, Lanzhou 730000, China
5. Department of General Surgery, Lanzhou University Second Hospital, Lanzhou 730000, China