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What is CA 125? What is a tumor marker?
CA 125 is a protein that is a so-called tumor marker or biomarker, which is a substance that is found
in greater concentration in tumor
cells than in other cells of the body. In particular, CA 125 is present in greater concentration in ovarian cancer cells than in other cells. It was first identified in the early 1980s, and the function of the CA 125
protein is not currently understood. CA stands for cancer antigen.