title: Effects of renal transplantation on serum-free and total PSA levels.
abstract: OBJECTIVE
  This study was undertaken to evaluate the effects of renal transplantation on serum level of free and total PSA.
  
  
  METHODS
  In this study, we included 30 male patients with a mean age of 46 years with end-stage renal disease undergoing renal transplantation at our department. None of the patients had any history of prostate cancer. All patients had immediate onset of renal function after transplantation, defined by a spontaneous decrease in serum creatinine on postoperative day 1 and a subsequent decrease daily during week 1. Renal transplantation included living-related donors in all patients. Blood samples were obtained before and at posttransplant day 6 before removal of Foley catheter. Measurements of free PSA and total PSA were performed with immunofluorometric assays. Glomerular filtration rates were monitored by analyzing serum creatinine. The significance of changes with time was estimated by the Wilcoxon signed ranks test for paired observations with P<.05 considered statistically significant.
  
  
  RESULTS
  The mean free and total PSA levels before transplantation were 0.22 (range, 0.0.05 to 0.4) and 1.5 ng/mL (range, 0.1 to 2.9), respectively. There was a significant decrease (30% of original levels) in serum fPSA at posttransplant day 6 (P<.05) in all patients. There was no significant changes of total PSA at posttransplant day 6.
  
  
  CONCLUSIONS
  These results verify the hypothesis that free PSA is eliminated from the blood circulation by glomerular filtration and severe renal failure influences its levels. Thus, we should consider different cutoffs for free to total ratio before and after renal transplantation.
authors.affiliation: Department of Urology and Transplantation, Hashemi Nejad Hospital, Iran University of Medical Sciences, Tehran, Iran. kooshakamali@hotmail.com
authors.forename: K
authors.initials: K
authors.lastname: Kamali
authors.forename: M A
authors.initials: MA
authors.lastname: Zargar
mesh_terms: D000328:Adult; D000368:Aged; D005919:Glomerular Filtration Rate; D006801:Humans; D016030:Kidney Transplantation / Q000502:physiology*; D019520:Living Donors; D008297:Male; D008875:Middle Aged; D017430:Prostate-Specific Antigen / Q000097:blood*; D012189:Retrospective Studies
chemical_list: D017430:Prostate-Specific Antigen