CA 15.3 (THY)
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A CA 15-3 test is a blood test that checks for CA 15-3 levels in the blood.
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A CA 15-3 test is a blood test that checks for CA 15-3 levels in the blood. CA 15-3 is a protein that breast cells produce normally. Doctors may refer to the CA 15-3 protein as a tumor marker. This term refers to any substance that cancer cells — or other cells that are responding to cancer — contain or produce.
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