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  • Title: The Haptoglobin genotype predicts cardio-renal mortality in type 1 diabetes.
    Author: Costacou T, Orchard TJ.
    Journal: J Diabetes Complications; 2016 Mar; 30(2):221-6. PubMed ID: 26684170.
    Abstract:
    AIMS: The Haptoglobin (HP) 2-2 genotype increases cardiovascular diabetes complication incidence. In type 1 diabetes, HP 2-2 also predicts declining kidney function and end-stage renal disease. We investigated whether HP 2-2 predisposes to cardio-renal mortality, while considering other causes of death as competing risks. METHODS: Individuals with type 1 diabetes and HP data available (n=486; mean baseline age, 27 and duration, 19 years) were selected for study. Vital status was assessed as of 8/31/2014. The underlying cause of death was determined and classified based on standardized procedures. RESULTS: During 25 years of follow-up, 79 (16.3%) cardio-renal deaths and 43 (8.8%) deaths related to other causes occurred. Although total mortality did not differ by HP (25.4% with HP 1 versus 24.6% with HP 2-2, p=0.84), a greater proportion of HP 2-2 carriers exhibited a cardio-renal death (19.0 versus 14.2, p=0.05). In time-to-event analyses, HP 2-2 was associated with a statistically significant increase of the sub-distribution hazard ratio for cardio-renal mortality (HR=1.64, p=0.03), although this effect was somewhat attenuated after multivariable adjustment (HR=1.58, p=0.05). CONCLUSIONS: Our results suggest that in addition to predicting the incidence of cardio-renal complications, HP 2-2 also increases susceptibility for cardio-renal mortality in type 1 diabetes. These findings require validation in other cohorts.
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