title: Racial differences in cellular composition of benign prostatic hyperplasia.
abstract: BACKGROUND
  The present study was designed to compare the cellular composition of benign prostatic hyperplasia (BPH) in Caucasian-American (CA), African-American (AA), and Japanese (JP) men.
  
  
  METHODS
  Biopsy specimens of the prostate were obtained from 15 men of each racial group with a prostate-specific antigen (PSA) of 4.1-10.0 ng/mL. The stained cores were quantitatively analyzed for the percentage of the area with different cellular composition (stroma (S), epithelium (E), epithelial lumen (L), and glandular component (E + L = G)), using computer-assisted color imaging.
  
  
  RESULTS
  The mean percent area density of S, E, and L in the prostate of CA men was 84.2, 12.1, and 3.8%, respectively; for AA, 84.4, 12.4, and 3.2%; for JP, 77.4, 15.2, and 7.5%. The S/E ratio is significantly lower in JP than in CA men. The S/G ratio is significantly lower in JP than in CA and AA men. Overall, JP contained more glandular lumen and less stromal component than that of CA and AA. CA and AA showed no significant difference in cellular composition.
  
  
  CONCLUSIONS
  The present study demonstrated the differences in cellular composition of BPH among the three races. This cellular composition divergence may account for previously observed racial differences in PSA, PSA density, and the incidence of clinical BPH.
authors.affiliation: Department of Urology, Kurashiki Central Hospital, Kurashiki, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Aoki
authors.forename: Y
authors.initials: Y
authors.lastname: Arai
authors.forename: H
authors.initials: H
authors.lastname: Maeda
authors.forename: K
authors.initials: K
authors.lastname: Okubo
authors.forename: K
authors.initials: K
authors.lastname: Shinohara
mesh_terms: D000368:Aged; D001706:Biopsy; D044383:Black People; D006651:Histocytochemistry; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007564:Japan; D008297:Male; D011467:Prostate / Q000166:cytology / Q000473:pathology; D017430:Prostate-Specific Antigen / Q000097:blood; D011470:Prostatic Hyperplasia / Q000097:blood / Q000473:pathology*; D044465:White People; D001741:Black or African American
chemical_list: D017430:Prostate-Specific Antigen