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Tumor Markers - Substances found in the blood, body fluids, or tissues that are produced by cancer cells. Tumor markers can be used to detect the presence of certain types of cancer in the body, as well as to monitor treatment progress. If a certain tumor marker is found in the body, it can indicate that the cancer is still present and ongoing treatment may still be recommended. Some examples of tumor markers include: CA 125 (in ovarian cancer), CA 15-3 (in breast cancer), and PSA (in prostate cancer).
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