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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Diabetes in first-degree family members: a predictor of type 2 diabetes in 159 nonscreening Alabama hemochromatosis probands with HFE C282Y homozygosity.
Diabetes Care 2014
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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