PSA and Body Composition by Dual X-Ray Absorptiometry (DXA) in NHANES

被引:33
作者
Fowke, Jay H. [1 ]
Matthews, Charles E. [1 ]
机构
[1] Vanderbilt Univ, Med Ctr, Vanderbilt Epidemiol Ctr, Div Epidemiol, Nashville, TN 37203 USA
基金
美国国家卫生研究院;
关键词
PSA; prostate cancer; obesity; dual X-ray absorptiometry; PROSTATE-SPECIFIC ANTIGEN; SURFACE-AREA; PLASMA-VOLUME; OBESITY; CANCER; MEN; HEIGHT; HEMODILUTION; PERCENTAGE; WEIGHT;
D O I
10.1002/pros.21039
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
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 similar to 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 similar to 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. (C) 2009 Wiley-Liss.Inc.
引用
收藏
页码:120 / 125
页数:6
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