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Title: Inflammatory Markers and Outcomes in Kidney Transplant Recipients.
Authors: Molnar MZ, Nagy K, Remport A, Tapolyai MB, Fülöp T, Kamal F, Kovesdy CP, Mucsi I, Mathe Z.
Year: 2017
Abstract* Background: Increased levels of TNF-α and IL6 are associated with inflammation and cardiovascular disease among patients with normal kidney function. However, little is known about their association with outcomes in kidney transplant recipients. Methods: We collected sociodemographic, clinical and laboratory parameters, medical and transplant history from 977 prevalent kidney transplant recipients enrolled in the Malnutrition-Inflammation in Transplant-Hungary study. Serum cytokine levels were measured at baseline. Associations between serum TNF-α and IL6 values and death with a functioning graft over a 6-year follow-up period were examined in unadjusted and adjusted models. Results: The mean ± SD age of the study population was 51 ± 13 years, 57% were men, 21% were diabetics. Median serum TNF-α and IL6 concentrations were significantly higher in patients who died with a functioning graft as compared with those who did not die during the follow-up period (TNF-α: median, 1.92 pg/mL; interquartile range [IQR], 1.43-2.67 pg/mL vs median, 2.25 pg/mL; IQR, 1.63-3.08 pg/mL, P < 0.001; and for IL6: median, 1.91 pg/mL; IQR, 1.21-3.02 pg/mL vs median, 2.81 pg/mL; IQR, 1.65-4.97 pg/mL, P < 0.001). Higher serum TNF-α and IL6 levels were associated with higher mortality risk in both unadjusted and fully adjusted models: TNF-α: hazard ratios (HRs)(1 pg/ml increments), 1.24; 95% confidence interval (CI), 1.13-1.36 and HRs(1 pg/ml increments), 1.19; 95% CI, 1.08-1.32; IL6: HRs(1 pg/ml increments), 1.06; 95% CI, 1.03-1.09 and HRs(1 pg/ml increments), 1.03; 95% CI, 0.99-1.06, respectively. Compared with patients whose serum TNF-α or IL6 levels were in the lowest tertile, those in the middle tertile had similar mortality risk (TNF-α: HR, 1.09; 95% CI, 0.74-1.61; IL6: HR, 1.05; 95% CI, 0.68-1.62), but patients in the highest tertile reported higher risk of mortality: TNF-α: HR, 1.45; 95% CI, 1.01-2.09; IL6: HR, 1.55; 95% CI, 1.04-2.32 in multivariable adjusted models. Conclusions: In prevalent kidney transplant recipients, serum TNF-α and IL6 were independently associated with death with a functioning graft.
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