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. Tumor markers include: eMedicineHealth Medical Reference
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