In individuals with a confirmed diagnosis, the
presence of a predictive biomarker is used to identify individuals who are more
likely to experience a favorable or unfavorable effect from a specific
intervention or exposure than individuals where the biomarker is absent. Predictive biomarkers may be used to refine
criteria for disease classification.
Tumour estrogen receptor status in women with
breast cancer, to identify those who will respond to endocrine therapy such as