Summary
Most studies evaluating immune markers for prediction of Type 1 (insulin-dependent) diabetes mellitus have focused on first degree relatives, although only 10 % of newly-diagnosed patients have an affected first degree relative. The Swedish Childhood Diabetes Register identifies 99 % of all diabetic children at diagnosis. In this population-based study, islet cell antibodies and insulin autoantibodies in 0–14-year-old Swedish consecutively-diagnosed patients and control subjects were analysed to define their sensitivity and specificity. Over 16 months (1986–1987), 515 Swedish children developed diabetes. Plasma samples were obtained from 494 (96 %) patients, and 420 matched control children. Among patients, the frequency of islet cell antibodies was 84 % (415 of 494), insulin autoantibodies 43 % (145 of 334); 40 % (135 of 334) were positive for both and 88 % (294 of 334) were positive for one or both. Among control children, 3 % (14 of 420) had islet cell antibodies, 1 % (4 of 390) insulin autoantibodies, and 4 % (16 of 390) had either autoantibody marker. The predictive value of finding a patient with the disease was only 7% since 4 % of the control children were antibody-positive and the cumulative incidence rate up to 15 years of age is 0.38 %. None of the autoantibody-positive (n = 21) or negative control children developed diabetes during 3 to 5 years of follow-up. Longitudinal investigations of islet cell or insulin-autoantibody-positive healthy children are necessary to accurately determine the conversion rate from marker positivity to disease onset.
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Landin-Olsson, M., Palmer, J.P., Lernmarks, Å. et al. Predictive value of islet cell and insulin autoantibodies for Type 1 (insulin-dependent) diabetes mellitus in a population-based study of newly-diagnosed diabetic and matched control children. Diabetologia 35, 1068–1073 (1992). https://doi.org/10.1007/BF02221683
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DOI: https://doi.org/10.1007/BF02221683