The serine protease inhibitor Kazal type 1 (SPINK1) is a member of the protease inhibitor family. As SPINK1 plays an essential role in the occurrence, development and prognosis of tumors, such as ovarian cancer,pancreatic cancer, hepatocellular carcinoma, colorectal cancer and prostate cancer, the clinical application of SPINK1 as a tumor marker has been widely concerned by researchers.