prostate-specificantigen

pros·tate-spe·cif·ic antigen (prŏsʹtāt'spĭ-sĭfʹĭk) n. Abbr. PSA

A protease secreted by the epithelial cells of the prostate gland. Serum levels are elevated in patients with benign prostatic hyperplasia and prostate cancer and are used as a screening test for prostate cancer.

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