[The relationships of PSA, FPSAR, clinical and pathological stage in patients with prostate cancer].

Objectives: To investigate the relationship between clinical and pathological stage, serum prostate specific antigen (PSA) concentration and free-to-total PSA ratio (FPSAR) in patients with prostate cancer.
Methods: Clinical and pathological stage were determined on the basis of pathological examination and clinic material in 42 prostate cancer patients treated by prostatectomy. PSA and FPSAR were measured before the operation. Spearman rank correlation was applied to evaluate the relationship between clinical and pathological stage, serum PSA concentration and FPSAR.
Results: Serum PSA concentration was significantly positively correlated with pathological stage(P < 0.05) but not correlated with clinical stage (P > 0.05) in prostate cancer patients. FPSAR was significantly correlated with pathological stage and negatively correlated with clinical stage in prostate cancer patients (P < 0.05).
Conclusions: FPSAR is a more powerful predictor of clinical stage, pathological stage and prognosis than PSA.