title: Body mass index influences prostate-specific antigen in men younger than 60 years of age.
abstract: OBJECTIVE
  Prostate-specific antigen (PSA) levels can be affected by many factors. Body mass index (BMI) is suspected to influence PSA levels, but the associations are controversial. The aim of this study was to examine whether PSA levels were affected by BMI and age in Koreans.
  
  
  METHODS
  We evaluated the association between BMI and PSA in a group of 8640 Korean men (aged 40-79 years) without prostate cancer who received a general health checkup. Eligible men were classified into age groups spanning 10 years. BMI was categorized as normal (BMI <22.9), overweight (BMI 23.0-24.9), obese (BMI 25.0-29.9), and very obese (BMI > or =30) according to the re-defined World Health Organization (WHO) criterion for the Asia Pacific Region. PSA levels were stratified by age and BMI category.
  
  
  RESULTS
  Prostate-specific antigen levels decreased with increasing BMI (P trend <0.001). However, the inverse correlations between PSA and BMI were significant only among men 40-59 years old (P trend <0.05, respectively). BMI showed no significant associations with PSA in 60-79 years old (P trend >0.05, respectively).
  
  
  CONCLUSIONS
  Our study demonstrates that increased BMI is associated with decreased PSA levels only in men younger than 60 years of age. When determining whether to carry out prostate biopsy as part of early prostate cancer detection, obesity should be considered as a factor associated with reduced PSA in healthy young men (<60 years old) with marginal PSA levels.
authors.affiliation: Department of Urology, College of Medicine, Chungbuk National University, 62 Kaeshin-dong, Heungduk-gu, Cheongju, Chungbuk, South Korea. urokyj@cbnu.ac.kr
authors.forename: Yong-June
authors.initials: YJ
authors.lastname: Kim
authors.forename: Byung Kuy
authors.initials: BK
authors.lastname: Han
authors.forename: Sung Kyu
authors.initials: SK
authors.lastname: Hong
authors.forename: Seok-Soo
authors.initials: SS
authors.lastname: Byun
authors.forename: Wun-Jae
authors.initials: WJ
authors.lastname: Kim
authors.forename: Sang Eun
authors.initials: SE
authors.lastname: Lee
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D001707:Biopsy, Needle; D015992:Body Mass Index; D006801:Humans; D008297:Male; D008875:Middle Aged; D050177:Overweight / Q000097:blood*; D011467:Prostate / Q000473:pathology; D017430:Prostate-Specific Antigen / Q000097:blood*
chemical_list: D017430:Prostate-Specific Antigen