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| tu·mor mark·er (plural tu·mor mark·ers) |
noun |
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| Definition: |
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biochemical indicator of cancer presence: a substance in the blood or urine that indicates, either specifically or by its high level, the presence of a malignant tumor in the body. Markers include the prostate-specific antigen, alpha-fetoprotein, various enzymes, and high levels of various normal hormones.
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