By definition a biomarker is

A defined characteristic that is measured as an indicator of normal biological processes, pathogenic processes, or responses to an exposure or intervention, including therapeutic interventions. Molecular, histologic, radiographic, or physiologic characteristics are types of biomarkers. A biomarker is not an assessment of how an individual feels, functions, or survives. Categories of biomarkers include:

susceptibility/risk biomarkers
diagnostic biomarkers
monitoring biomarkers
prognostic biomarkers
predictive biomarkers
pharmacodynamic/response biomarkers
safety biomarkers.

Source: BEST (Biomarkers, EndpointS, and other Tools) Resource (FDA-NIH)

Links: BEST (Biomarkers, EndpointS, and other Tools) Resource

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