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In genetics, a biomarker (identified as genetic marker) is a DNA sequence that causes disease or is associated with susceptibility to disease. They can be used to create genetic maps of whatever organism is being studied.ne example of a commonly used biomarker in medicine is prostate-specific antigen (PSA). This marker can be measured as a proxy of prostate size with rapid changes potentially indicating cancer.
The assessment of a typical biomarker in cancer helps in the development of therapies that can target the biomarker. This can minimize the risk of toxicity and reduce the cost of treatment. In cancer research, genetic studies are valuable because genetic abnormalities so often underlie the development of cancer.