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The page below is a sample from the LabCE course Tumor Markers. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Tumor Marker

A tumor marker (biomarker) is a detectable or measurable substance, which is produced by the cells of a tumor or by the host in response to the tumor. It can be used to differentiate the tumor from normally dividing tissue. Such measurable substances may be found in blood, urine, other body fluids, tissue samplings, or cellular cultures.