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Definition of Biomarker

Biomarker: A biologic feature that can be used to measure the presence or progress of disease or the effects of treatment. For example, prostate specific antigen (PSA) is a biomarker for cancer of the prostate.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=6685
Last Editorial Review: 3/19/2012

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