ca153 is a tumor marker, the full Chinese name is carcinoembryonic antigen 153, first discovered and named in the 1980s. It is of great value for the diagnosis, treatment and postoperative follow-up of breast cancer. The sensitivity is low in the early stage of breast cancer, about 60%. The positivity rate for metastatic breast cancer is up to 80%. In Europe, CA153 is commonly used as an adjuvant diagnostic indicator for breast cancer, as well as for postoperative follow-up and monitoring of tumor recurrence and metastasis. However, other tumors such as lung cancer, kidney cancer, colon cancer, pancreatic cancer, ovarian cancer, liver cancer, etc. may also have different degrees of elevation. It is recommended to follow up the changes of ca153.