CA 15-3. Is a tumor marker for breast cancer.
Breast cancer. Ca 15-3 levels can be used to monitor the course of breast cancer. If a patient with breast cancer has elevated ca 15-3 levels the blood levels of the marker are a measure of the amount of tumor and can be followed to judge the response to treatment. It is not useful as a diagnostic test.
Breast cancer. Ca 15-3 is one of the cancer markers that is useful following the course of the tumor, i.e., in a patient with breast cancer and elevated levels of 15-3, the blood levels reflect tumor mass and allow the doctor to monitor the course of the tumor. It is not useful for cancer screening.