title: The value of percent free prostate specific antigen, prostate specific antigen density of the whole prostate and of the transition zone in Turkish men.
abstract: BACKGROUND
  This study was undertaken to evaluate the value of percent free prostate specific antigen (PSA), PSA density of the whole prostate (PSAD) and of the transition zone (TZPSAD) in reducing unnecessary biopsies in Turkish men with serum PSA levels between 2.5 and 20 ng/mL.
  
  
  METHODS
  A total of 105 patients referred for early prostate cancer detection or lower urinary tract symptoms participated in the study. All patients had serum total PSA level, PSAD, total prostate volume, and rectal examination, 43 patients had serum free PSA level, and 65 patients had TZPSAD. Using transrectal ultrasound, sextant biopsy and two additional transitional zone biopsies were performed. The value of percent PSA, PSAD, and TZPSAD in reducing unnecessary biopsies was evaluated.
  
  
  RESULTS
  Prostate carcinoma was detected in 25 of 105 patients (23.8%). Overall, areas under the ROC curves for percent free PSA, PSAD, and TZPSAD were 0.553, 0.595, and 0.550, respectively. In patients with a benign rectal examination, the value of percent free PSA slightly increased. On the other hand, in patients with prostate volume smaller than 50 cc, the value of percent free PSA and TZPSAD was encouraging. Areas under the ROC curves for percent free PSA, and TZPSAD were 0.615 and 0.642 respectively.
  
  
  CONCLUSIONS
  In Turkish men with intermediate serum PSA concentrations, percent free PSA, PSAD, and TZPSAD are poor predictors of biopsy outcome, whereas in the prostate smaller than 50 cc, percent free PSA and TZPSAD provide additional information. This may reflect ethnic differences between this population and those reported in other series.
authors: Department of Urology, Gazi University School of Medicine, Besevler, Ankara, Turkey.
authors: B
authors: B
authors: Akduman
authors: T
authors: T
authors: Alkibay
authors: A
authors: A
authors: Tuncel
authors: I
authors: I
authors: Bozkirli
mesh_terms: D000230:Adenocarcinoma / Q000097:blood / Q000175:diagnosis* / Q000473:pathology; D000368:Aged; D000369:Aged, 80 and over; D001706:Biopsy; D003627:Data Interpretation, Statistical; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011467:Prostate / Q000378:metabolism* / Q000473:pathology; D017430:Prostate-Specific Antigen / Q000097:blood*; D011470:Prostatic Hyperplasia / Q000097:blood / Q000175:diagnosis / Q000473:pathology; D011471:Prostatic Neoplasms / Q000097:blood / Q000175:diagnosis* / Q000473:pathology; D012372:ROC Curve; D012680:Sensitivity and Specificity; D014421:Turkey
chemical_list: D017430:Prostate-Specific Antigen