title: Association between prostate cancer and serum testosterone levels.
abstract: BACKGROUND
  The purpose of the current study was to determine whether the presence of prostate cancer altered serum testosterone levels.
  
  
  METHODS
  Initially, we evaluated both serum total and free testosterone levels in patients with either high-grade (n = 18) or moderate-grade (n = 146) prostate cancer, detected by prostate needle biopsies. Then both serum total and free testosterone levels, before and after prostatectomy, were compared in 79 of the 164 men with prostate cancer.
  
  
  RESULTS
  In the first setting, serum total and free testosterone levels (307 +/- 24 ng/dl and 1.14 +/- 0.09 ng/dl) in patients with high-grade prostate cancer were significantly lower than those in patients with moderate-grade prostate cancer (452 +/- 12 ng/dl and 1.51 +/- 0.04 ng/dl) and those without prostate cancer (451 +/- 17 ng/dl and 1.55 +/- 0.06 ng/dl). After prostatectomy in 79 patients with prostate cancer, serum levels of both total and free testosterone (511 +/- 15 ng/dl and 1.78 +/- 0.05 ng/dl) were found significantly elevated when compared with their respective presurgical total and free testosterone levels (450 +/- 17 ng/dl and 1.60 +/- 0.06 ng/dl).
  
  
  CONCLUSIONS
  Our findings show that serum total and free testosterone levels in patients with prostate cancer are altered, supporting the possibility that prostate cancer may inhibit serum testosterone levels.
authors.affiliation: Department of Laboratory Medicine, Geisinger Health System, Danville, Pennsylvania, USA.
authors.forename: Ping L
authors.initials: PL
authors.lastname: Zhang
authors.forename: Seymour
authors.initials: S
authors.lastname: Rosen
authors.forename: Ravindra
authors.initials: R
authors.lastname: Veeramachaneni
authors.forename: Jerry
authors.initials: J
authors.lastname: Kao
authors.forename: William C
authors.initials: WC
authors.lastname: DeWolf
authors.forename: Glenn
authors.initials: G
authors.lastname: Bubley
mesh_terms: D000328:Adult; D000368:Aged; D001706:Biopsy; D006801:Humans; D008297:Male; D008875:Middle Aged; D017430:Prostate-Specific Antigen / Q000097:blood; D011468:Prostatectomy; D011471:Prostatic Neoplasms / Q000097:blood* / Q000473:pathology / Q000601:surgery; D012189:Retrospective Studies; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone; D017430:Prostate-Specific Antigen