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Tumor markers are substances made in excess in the body when
cancer or a benign (harmless) condition is present. Tests done on blood or
other body fluids can find tumor markers.
Some tumor markers can
help the doctor diagnose certain cancers. And tumor markers often help the
doctor track a person's response to treatment. For example, a woman with
ovarian cancer may have a high CA 125 level when she is first diagnosed. After
treatment, her levels of CA 125 should fall. Then if her tumor marker level
goes up in the future, it could mean that the cancer has come back.
Some tumor markers help doctors choose the most effective treatment. For example, a person who has non-small cell lung cancer may have a tumor sample checked for the KRAS gene mutation to see if a certain kind of targeted therapy will work.
Tumor markers include:
Current as of:
November 20, 2015
Sarah Marshall, MD - Family Medicine & Ross Berkowitz, MD - Obstetrics and Gynecology
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