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A biomarker is some a measurable quantity used to ascertain the state of a biological system. For example, elevated PSA levels are sometimes used as a biomarker for prostate cancer,[1][2] as PSA is regulated through the androgen receptor and prostate cancer often results in increased androgen receptor activity.[2]


  1. K. Clint Cary et al (2013). "Biomarkers in prostate cancer surveillance and screening: past, present, and future". Therapeutic Advances in Urology. 5 (6): 318–329. doi:10.1177/1756287213495915. PMC 3825107. PMID 24294290. ISSN 1756-2872.
  2. 2.0 2.1 Christina V. Obiezu et al (2000). "DRAMATIC SUPPRESSION OF PLASMA AND URINARY PROSTATE SPECIFIC ANTIGEN AND HUMAN GLANDULAR KALLIKREIN BY ANTIANDROGENS IN MALE-TO-FEMALE TRANSSEXUALS". The Journal of Urology. 163 (3): 802–805. doi:10.1016/S0022-5347(05)67808-1. ISSN 00225347.