Glycated antigen CA125 is a tumor marker test for clinical suspicion of ovarian cancer or gastrointestinal tract tumors. When there is ovarian cancer or gastrointestinal tract tumors, CA125 will be obviously elevated, and gastrointestinal tract tumors can also show obvious elevation of CA125. Therefore, for middle-aged or above women with pelvic mass, blood can be drawn to check whether CA125 is obviously elevated, and if there is obvious elevation, we should consider the possibility of ovarian cancer, and then we can do surgical resection or puncture biopsy of the mass in order to make clear whether it is ovarian cancer or not. The main treatments for ovarian cancer are radical surgical resection and postoperative adjuvant chemotherapy. Digestive tract tumors such as gastric cancer, pancreatic cancer, colorectal cancer can also have elevated CA125, so CT scanning and enhancement examination of the whole abdomen can also help to find out whether there are tumors in the digestive tract.