Cancer Antigen 125 (CA-125)Test Overview
A cancer antigen 125 (CA-125) is a
protein found on the surface of many
ovarian cancer cells. It also can be found in other
cancers and in small amounts in normal tissue. A CA-125 test measures the
amount of this protein in the blood. CA-125 is used as a tumor
marker—which means the test can help show if some types of cancer are present.
Most often, the CA-125 test is used to check how well treatment for ovarian
cancer is working or to see if ovarian cancer has returned.
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