A higher PSA-density cut-off level in patients with intermediate PSA values for the early detection of prostate...

The use of PSA-density (PSAD) as an indicator for prostate biopsy at intermediate PSA values has generated controversy. There are investigators who consider that the determination of PSAD is futile, and that it is better to do a prostate biopsy based on PSA values alone, TRUS (Transrectal Ultrasound) findings and/or DRE examinations. Asian countries, especially in the Far East, are considered to have a low incidence of prostate cancer (PCa). However, based on western references, we still measure PSA-density with a cut-off level of 0.15 to promote prostate biopsy in patients with intermediate PSA values (4.1-10.0 ng/ml). Our study aims to evaluate the usefulness of PSAD as an indication for biopsy in patients with intermediate serum PSA values. To evaluate the usefulness of this indicator, we conducted a retrospective study of 132 uncatheterized (to minimize potential bias) BPH and PCa cases that were hospitalized in our department between 1995-1997 (3 years). This group comprised 127 BPH and 5 PCa patients. Mean age was 66.1 +/- 7.69 years; mean PSA was 7.92 +/- 9.289 ng/ml; mean prostate volume was 54.1 +/- 26.72 cc; mean PSAD was 0.15 +/- 0.185. More specifically, there were 49 patients with intermediate PSA values (47 BPH & 2 PCa). The receiver operator characteristic (ROC) curve revealed an optimum cut-off level of 0.19. At this level of PSA density, the measured sensitivity was 100% with a specificity of 79%. We concluded that, in our uncatheterized patients (without retention) series, the PSAD cut-off level for prostate biopsy (0.19) was higher than that in the western world (0.12 or 0.15).