CA 15-3 is elevated in about 30% of women with localized breast
cancer and in about 75% of those with metastatic breast
cancer (
cancer that has spread to other organs). CA 15-3 also may be elevated in healthy people and in individuals with other cancers, conditions, or diseases, such as colorectal cancer, lung cancer, cirrhosis, hepatitis, and benign breast disease.
Cancer antigen 19-9 (CA 19-9) is a protein that exists on the surface of certain cells.