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  • Title: Diabetes in first-degree family members: a predictor of type 2 diabetes in 159 nonscreening Alabama hemochromatosis probands with HFE C282Y homozygosity.
    Author: Barton JC, Barton JC, Acton RT.
    Journal: Diabetes Care; 2014; 37(1):259-66. PubMed ID: 23990522.
    Abstract:
    OBJECTIVE We sought to identify predictors of diabetes diagnosed before hemochromatosis. RESEARCH DESIGN AND METHODS We studied these 16 variables in 159 nonscreening hemochromatosis probands with HFE C282Y homozygosity: age; sex; BMI; diabetes reports in first-degree family members (dichotomous); heavy ethanol consumption; cigarette smoking; elevated serum alanine aminotransferase/aspartate aminotransferase levels; nonalcoholic fatty liver; chronic viral hepatitis; cirrhosis; hand arthropathy; iron removed by phlebotomy; and positivity for HLA-A*01, B*08; A*03, B*07; and A*03, B*14 haplotypes. We performed univariable and multivariable analyses. RESULTS Twenty-three probands (14.5%) had diabetes; 19 were men. Each of the 23 probands had type 2 diabetes. Mean BMI was greater in probands with diabetes (31.7 ± 8.5 [SD] kg/m(2) vs. 27.6 ± 5.1 kg/m(2); P = 0.032). Reports of any first-degree family member with diabetes were more prevalent in probands with than in probands without diabetes (69.6 vs. 17.6%; P < 0.0001). In probands with diabetes, the odds ratio (OR) of maternal diabetes was 6.7 (95% CI 2.3-19.7; P = 0.0005) and of sibling diabetes was 11.7 (3.0-45.5; P = 0.0004). In a logistic regression model, predictors of diabetes at hemochromatosis diagnosis in 159 probands were diabetes reports in family members (OR 8.5 [95% CI 2.9-24.8]; P < 0.0001) and BMI (1.1 [1.0-1.2]; P = 0.049). This model explained 26.0% of total deviance contributing to diabetes. CONCLUSIONS In nonscreening hemochromatosis probands with HFE C282Y homozygosity, a heritable factor(s) increases the risk of diabetes diagnosed before hemochromatosis.
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