title: The Prostate Health Index in predicting initial prostate biopsy outcomes in Asian men with prostate-specific antigen levels of 4-10 ng/mL.
abstract: OBJECTIVE
  To investigate the role of the Prostate Health Index (phi) in prostate cancer (PCa) detection in patients with a prostate-specific antigen (PSA) level of 4-10 ng/mL receiving their first prostatic biopsy in an Asian population.
  
  
  METHODS
  This was a retrospective study of archived serum samples from patients enlisted in our tissue bank. Patients over 50 years old, with PSA level of 4-10 ng/mL, a negative digital rectal examination, and received their first prostatic biopsy between April 2008 and April 2013, were recruited. The serum sample collected before biopsy was retrieved for the measurement of various PSA derivatives and the phi value was calculated for each patient. The performance of these parameters in predicting the prostatic biopsy results was assessed.
  
  
  RESULTS
  Two hundred and thirty consecutive patients, with 21 (9.13 %) diagnosed with PCa, were recruited for this study. Statistically significant differences between PCa patients and non-PCa patients were found for total PSA, PSA density, [-2]proPSA (p2PSA), free-to-total PSA ratio (%fPSA), p2PSA-to-free PSA ratio (%p2PSA), and phi. The areas under the curve of the receiver operating characteristic curve for total PSA, PSA density, %fPSA, %p2PSA, and phi were 0.547, 0.634, 0.654, 0.768, and 0.781, respectively. The phi was the best predictor of the prostatic biopsies results. At a sensitivity of 90 %, the use of the phi could have avoided unnecessary biopsies in 104 (45.2 %) patients.
  
  
  CONCLUSIONS
  Use of the phi could improve the accuracy of PCa detection in patients with an elevated PSA level and thus avoid unnecessary prostatic biopsies.
authors.affiliation: Division of Urology, Department of Surgery, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China, ngcf@surgery.cuhk.edu.hk.
authors.forename: C F
authors.initials: CF
authors.lastname: Ng
authors.forename: Peter K F
authors.initials: PK
authors.lastname: Chiu
authors.forename: N Y
authors.initials: NY
authors.lastname: Lam
authors.forename: H C
authors.initials: HC
authors.lastname: Lam
authors.forename: Kim W M
authors.initials: KW
authors.lastname: Lee
authors.forename: Simon S M
authors.initials: SS
authors.lastname: Hou
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019540:Area Under Curve; D044466:Asian People; D014408:Biomarkers, Tumor / Q000097:blood*; D061765:Endoscopic Ultrasound-Guided Fine Needle Aspiration; D006801:Humans; D008297:Male; D008875:Middle Aged; D060787:Neoplasm Grading; D009929:Organ Size; D011237:Predictive Value of Tests; D011467:Prostate / Q000473:pathology*; D017430:Prostate-Specific Antigen / Q000097:blood*; D011471:Prostatic Neoplasms / Q000097:blood* / Q000473:pathology*; D020033:Protein Isoforms / Q000097:blood; D012372:ROC Curve; D012189:Retrospective Studies
chemical_list: D014408:Biomarkers, Tumor; D020033:Protein Isoforms; D017430:Prostate-Specific Antigen