Serum glycoantigen 199, also known as CA19-9, is a very common tumor indicator, and many of these indicators are within the normal range. For example, some normal people have no problem in physical examination or tumor screening, but only in other malignant tumors such as pancreatic malignancy, there may be more elevated indicators. If the elevation of CA19-9 is greater than 400 U/ml, and then combined with the imaging examination, occupying lesions are found in the pancreatic area, a clinical diagnosis of pancreatic cancer can be made. Because the location of pancreatic cancer is deeper, it is more difficult to do puncture for pathology. Of course, early stage of pancreatic cancer still has the chance of radical surgery, and pancreaticoduodenectomy can be done. After surgery, adjuvant chemotherapy is also needed, and CA19-9 index needs to be monitored to determine the prognosis after treatment.