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Gutiérrez, Orlando M; Mannstadt, Michael; Isakova, Tamara; Rauh-Hain, Jose Alejandro; Tamez, Hector; Shah, Anand; Smith, Kelsey; Lee, Hang; Thadhani, Ravi; Jüppner, Harald; Wolf, Myles
New England journal of medicine/The New England journal of medicine, 08/2008, Letnik: 359, Številka: 6Journal Article
Fibroblast growth factor 23 (FGF-23) is a hormone that increases the rate of urinary excretion of phosphate and inhibits renal production of 1,25-dihydroxyvitamin D, thus helping to mitigate hyperphosphatemia in patients with kidney disease. Hyperphosphatemia and low 1,25-dihydroxyvitamin D levels are associated with mortality among patients with chronic kidney disease, but the effect of the level of FGF-23 on mortality is unknown. We examined mortality according to serum phosphate levels in a prospective cohort of 10,044 patients who were beginning hemodialysis treatment and then analyzed FGF-23 levels and mortality in a nested case-control sample of 200 subjects who died and 200 who survived during the first year of hemodialysis treatment. We hypothesized that increased FGF-23 levels at the initiation of hemodialysis would be associated with increased mortality. Serum phosphate levels in the highest quartile (>5.5 mg per deciliter 1.8 mmol per liter) were associated with a 20% increase in the multivariable adjusted risk of death, as compared with normal levels (3.5 to 4.5 mg per deciliter 1.1 to 1.4 mmol per liter) (hazard ratio, 1.2; 95% confidence interval CI, 1.1 to 1.4). Median C-terminal FGF-23 (cFGF-23) levels were significantly higher in case subjects than in controls (2260 vs. 1406 reference units per milliliter, P<0.001). Multivariable adjusted analyses showed that increasing FGF-23 levels were associated with a monotonically increasing risk of death when examined either on a continuous scale (odds ratio per unit increase in log-transformed cFGF-23 values, 1.8; 95% CI, 1.4 to 2.4) or in quartiles, with quartile 1 as the reference category (odds ratio for quartile 2, 1.6 95% CI, 0.8 to 3.3; for quartile 3, 4.5 95% CI, 2.2 to 9.4; and for quartile 4, 5.7 95% CI, 2.6 to 12.6). Increased FGF-23 levels appear to be independently associated with mortality among patients who are beginning hemodialysis treatment. Future studies might investigate whether FGF-23 is a potential biomarker that can be used to guide strategies for the management of phosphorus balance in patients with chronic kidney disease.
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