In a prospective study to evaluate the prevalence and predictive potential of circulating islet-cell antibodies, we have screened 1723 "normal" first-degree relatives (parents, siblings, and offspring) of patients with insulin-dependent diabetes mellitus. The prevalence of islet-cell antibodies on initial screening was 0.9 per cent (16 of 1723). Over a maximal follow-up period of two years, insulin-dependent diabetes mellitus developed in 2 of 16 relatives with islet-cell antibodies and in 1 of 1707 without antibodies. In addition, 6 of 12 nondiabetic relatives with islet-cell antibodies had abnormally low insulin responses--below the third percentile in 6 and below the first percentile in 4--on their initial intravenous glucose challenge. Thus, prospective islet-cell antibody screening of high-risk first-degree relatives, in combination with intravenous glucose-tolerance testing, is capable of identifying immunologically abnormal persons with profoundly diminished beta-cell function, who are presumably at increased risk of insulin-dependent diabetes mellitus.
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