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It’s reported that free to total prostate specific antigen ration (f/tPSA) can provide more benefit than the single use of prostate specific antigen (PSA) in the diagnosis of prostate cancer (PCa). We measured serum PSA and fPSA levels in 62 cases of benign prostatic hyperplasia (BPH) and 40 cases of PCa using radioimmunoassay, with patients’ age range 59y~ 89y.