title: Relationships between total/free prostate-specific antigen and prostate volume in Chinese men with biopsy-proven benign prostatic hyperplasia.
abstract: OBJECTIVE
  This study investigated relationships between total prostate-specific antigen (tPSA), free prostate-specific antigen (fPSA), and prostate volume (PV) in Chinese men with biopsy-proven BPH, and analyzed whether fPSA performed better than tPSA at estimating thresholds of PV.
  
  
  METHODS
  From 2003 to 2008, a total of 286 patients with a PSA less than 10 ng/ml and biopsy proven benign prostatic hyperplasia were included in this study. The relationships between age, PV, tPSA, and fPSA were analyzed using the Pearson correlation coefficient (r). Receiver-operating characteristic (ROC) curves were constructed to evaluate and compare the ability of serum tPSA and fPSA to estimate thresholds of PV in men with biopsy-proven BPH.
  
  
  RESULTS
  Among relationships between tPSA, fPSA, age, and PV, the highest correlation was found between fPSA and PV (r = 0.456, P < 0.001); the correlation coefficient was much lower between tPSA and PV (r = 0.278, P < 0.001). The ROC curves revealed that the performance of fPSA at predicting threshold prostate sizes (30, 40, and 50 ml) showed areas under the curve (AUC) ranging from 0.72 to 0.75, denoting better discrimination of PV than that achieved by use of tPSA.
  
  
  CONCLUSIONS
  Although tPSA significantly correlated with PV in Chinese men with biopsy-proven BPH, the correlation between fPSA and PV was much stronger, and fPSA performed significantly better than tPSA at predicting thresholds of PV. fPSA may be used to estimate PV and could be a useful tool in making therapeutic decisions in Chinese men with BPH.
authors.affiliation: Department of Urology, The First Affiliated Hospital, School of Medicine, Zhejiang University, 310003, Hangzhou, Zhejiang Province, China.
authors.forename: Qiqi
authors.initials: Q
authors.lastname: Mao
authors.forename: Xiangyi
authors.initials: X
authors.lastname: Zheng
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Jia
authors.forename: Yuyong
authors.initials: Y
authors.lastname: Wang
authors.forename: Jie
authors.initials: J
authors.lastname: Qin
authors.forename: Kai
authors.initials: K
authors.lastname: Yang
authors.forename: Yu
authors.initials: Y
authors.lastname: Bai
authors.forename: Liping
authors.initials: L
authors.lastname: Xie
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000097:blood*; D001707:Biopsy, Needle; D002681:China; D015331:Cohort Studies; D016001:Confidence Intervals; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009929:Organ Size; D011237:Predictive Value of Tests; D011336:Probability; D017430:Prostate-Specific Antigen / Q000097:blood*; D011468:Prostatectomy / Q000379:methods; D011470:Prostatic Hyperplasia / Q000097:blood* / Q000473:pathology* / Q000601:surgery; D012372:ROC Curve; D012189:Retrospective Studies; D018570:Risk Assessment; D012680:Sensitivity and Specificity
chemical_list: D014408:Biomarkers, Tumor; D017430:Prostate-Specific Antigen