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chemtronbio2018 on 17 May 18Prostate specific antigen (PSA) is a serine prostate that is found only in the prostate within the epithelial cells of the acini and ducts. Normal PSA concentration in serum or plasma is 0.1-2.6ng/ml. Reports have suggested that elevated level of serum or plasma PSA is the most useful tumor markers in diagnosis of prostate cancer.