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PSA and body composition by dual X‐Ray absorptiometry (DXA) in NHANES
Author(s) -
Fowke Jay H.,
Matthews Charles E.
Publication year - 2009
Publication title -
the prostate
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.295
H-Index - 123
eISSN - 1097-0045
pISSN - 0270-4137
DOI - 10.1002/pros.21039
Subject(s) - lean body mass , body mass index , medicine , prostate cancer , dual energy x ray absorptiometry , population , national health and nutrition examination survey , trunk , obesity , fat mass , endocrinology , urology , cancer , bone mineral , body weight , osteoporosis , biology , ecology , environmental health
BACKGROUND Obese men are at higher risk for advanced prostate cancer and have a poorer prognosis following treatment. Several studies also report that obese men have lower blood PSA levels, suggesting that obesity may be interfering with the ability to detect early‐stage prostate cancer. METHODS Dual X‐ray absorptiometry (DXA) is considered a gold‐standard measurement of body composition. We investigated the association between PSA levels and body composition measured by DXA among 1,360 men participating in NHANES (2001–2004), a representative sample of the U.S. male population. RESULTS After controlling for age, race, and other factors, PSA concentration was ∼15% lower for men with the highest level of total mass, lean mass, fat mass, trunk lean mass, and trunk fat mass (all P for trend <0.05). We then multiplied PSA concentration by estimated plasma volume to calculate the amount of PSA in circulation (i.e., PSA mass). Total body fat mass and fat mass located in the body trunk were not significantly associated with PSA mass, however, PSA mass was ∼10–15% higher across low versus high categories of total body lean mass and bone mineral content (all P ‐trend <0.05). CONCLUSION Our results using DXA to measure body composition confirm that a greater body mass, not just fat mass, is associated with a lower PSA concentration. This is consistent with PSA hemodilution within men with a higher body mass index. The separate associations between measured lean and fat mass on calculated PSA mass require further investigation. Prostate 70: 120–125, 2010. ©2009 Wiley‐Liss, Inc.