CA-125, also known as CA125, is an abbreviation for cancer antigen 125. CA-125 is a tumor marker or biomarker that may be elevated in the blood of some people with specific types of cancers. CA-125 is a mucinous glycoprotein and the product of the MUC16 gene.
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A blood test that measures the level of CA-125, a substance found in blood, other body fluids and some tissues. Increased levels of CA-125 may be a sign of cancer.