CA-125 Tumor Marker
- Cancer Antigen 125
The presence of high levels of the antigen CA-125 in the blood is a tumor marker, and indicates ovarian cancer. This test is very accurate when used to diagnose ovarian cancer and to monitor how well you are responding to treatment; to identify the risk of cancer recurrence, and to also help to determine prognosis. CA-125 levels are not used as a screening tool for ovarian cancer, since high blood levels are also seen in colon, lung and pancreatic cancer. The presence of the non-cancerous conditions endometriosis, cirrhosis, pancreatitis, peritonitis, or pelvic inflammatory disease (PID) can cause high blood levels of CA-125, as well as pregnancy, menstruation, or recent abdominal surgery.
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