Obese Men With Prostate Cancer Generally Have Lower PSA Levels
The authors explain that recent evidence indicates that prostate cancer screening may be adversely affected by a higher BMI. Prostate cancer detection accuracy can be compromised if PSA concentration in the blood is lower because of obesity, or other factors. Several studies found that obese men tend to have lower PSA concentrations, compared to men who are not obese.
The researchers say "However, men with higher BMIs also have larger plasma volumes, which could decrease serum concentrations of soluble tumor markers - a phenomenon known as hemodilution."
Lionel L. Bañez, M.D., Duke University Medical Center, Durham, N.C., and team carried out a study to find out what the link between hemodilution and PSA concentration in obese men with prostate cancer was. The study looked at men who had undergone radical prostatectomy for prostate cancer during the period 1988-2006. 1,373 had been treated at the Shared Equal Access Regional Cancer Hospital, 1,974 at the Duke Prostate Center, and 10,287 at Johns Hopkins Hospital.
The scientists found that there was a significant link between higher BMI and greater plasma volume in all study populations. A man whose BMI is at least 35 has 21%-23% higher plasma volumes compared to a man of normal weight, the authors wrote. After making adjustments for multiple clinicopathological variables, higher BMI was linked to lower pre-operative PSA concentrations in the groups. Men whose BMIs were at least 35 had 11%-21% lower PSA concentrations compared to a normal weight man.
The researchers concluded "In 3 distinct prostate cancer cohorts, all treated by radical prostatectomy, hemodilution from increased plasma volume may be responsible for the observed decreased PSA concentration in men with higher BMI. This association needs to be confirmed prospectively in screened populations that include men without prostate cancer."
JAMA
2007;298(19):2275-2280
Written by - Christian Nordqvist
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Bãrbaþii obezi cu cancer de prostatã au în general mai mici PSA Nivele - Obese Men With Prostate Cancer Generally Have Lower PSA Levels - articole medicale engleza - startsanatate