This test measures the amount of a protein called CA 19-9 (cancer antigen 19-9) in the blood. CA 19-9 is a type of tumor marker. Tumor markers are substances made by cancer cells or by normal cells in response to cancer in the body.
Cancer antigen 15-3 (CA 15-3) is used to monitor response to breast cancer treatment and disease recurrence.
A CA 125 test measures the amount of the protein CA 125 (cancer antigen 125) in your blood. The test may be used to monitor certain cancers during and after treatment.
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