Association between glomerular filtration rate, free, total, and percent free prostate-specific antigen.
OBJECTIVE
To determine the relationship between glomerular filtration rate (GFR) and free prostate-specific antigen (fPSA), percent-free PSA (%fPSA), and total PSA (tPSA) in patients with diminished kidney function not on dialysis, using nationally representative data.


METHODS
A total of 3782 men aged ≥ 40 years who participated in the National Health and Nutrition Examination Survey 2001-2006, and who met eligibility criteria for PSA testing were included in the final study population. GFR (mL/min/1.73 m(2)) was calculated using the Modification of Diet in Renal Disease equation 7 and categorized as ≥ 90, 60 to < 90, and 15 to < 60. Distribution of tPSA, fPSA, and %fPSA were estimated by GFR category and by age and race. Multivariate linear regression models were fit to determine the adjusted relationship between GFR and tPSA and %fPSA after adjusting for age, race, and body mass index.


RESULTS
The multivariate linear regression analysis showed that GFR had a linear relationship with tPSA that was of borderline significance. There was a significant nonlinear relationship between GFR and %fPSA (P < .001): increased GFR was associated with a decrease in %fPSA for GFR levels below 90 [eg, change in %fPSA = -2.67 (95% CI -3.56, -1.77) for a GFR of 85 as compared with 65; P < .001]. The decline in %fPSA with increasing GFR was nonsignificant for GFR levels above 90.


CONCLUSIONS
Our finding that renal function as measured by GFR is negatively associated with %fPSA has potential implications for use of this test in men with renal disease.
Joseph
Djenaba A
DA
Division of Cancer Prevention and Control, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia 30341, USA. dajoseph@cdc.gov
Thompson
Trevor
T
Saraiya
Mona
M
Werny
David M
DM
D000328:Adult; D000368:Aged; D005919:Glomerular Filtration Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D017430:Prostate-Specific Antigen / Q000097:blood*; D011471:Prostatic Neoplasms / Q000175:diagnosis; D051436:Renal Insufficiency, Chronic / Q000097:blood* / Q000503:physiopathology
D017430:Prostate-Specific Antigen