Glycoantigen CA153 is a substance secreted by epithelial cells and a tumor marker. Glycoantigen CA153 is a substance secreted by epithelial cells with secretory function, such as breast, lung, gastrointestinal tract, etc. It belongs to a kind of excretory material of human body, and is also a tumor marker, which can be used for initial screening of lung cancer, breast cancer, ovarian cancer and other cancers. Under normal circumstances, glycan antigen CA153 is kept within the range of 28ku/L. If mild elevation occurs, it may be caused by inflammation, pregnancy, etc.; however, if significant increase occurs, such as more than 10 times of the normal range, there is a high probability that it is caused by cancer, and it is necessary to improve the CT, pathological tissue biopsy and other examinations to clarify the cause.