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Although existence of islet cell antibodies (ICA) is regarded as secondary to beta cell death, islet cell surface antibodies (ICSA) might play a role in the disease process. We have collected information from nine European clinics to determine whether ICSA are more common in diabetic children or their relatives in geographical areas or time periods of high incidence of insulin-dependent diabetes mellitus (IDDM). In Finland and Sweden ("North group") with a high incidence of IDDM during childhood, 36% of the patients were positive or weakly positive for ICSA at diagnosis compared with 24% in France (p = 0.1), 11% in Berlin-Vienna (p &lt; 0.01), and 14% in Italy (p &lt; 0.01). This difference was seen in all age groups but was most pronounced in the youngest (0-4 y). This geographical difference was also seen among family members of whom 46% were positive or weakly positive in the North group, 25% in France (p &lt; 0.001), 21% in Berlin-Vienna (p &lt; 0.001), and 16% in Italy (p &lt; 0.001). Of several analyzed antibodies (ICA, gastric parietal cell, thyroglobulin, and thyroid microsomal), only ICSA showed simultaneous positivity in all family members (r = 0.32, p &lt; 0.01). ICSA were most common in family members of patients with short (&lt; 8 d) duration of symptoms (p &lt; 0.05) and showed a similar seasonality, both in patients and relatives, as the incidence of IDDM. We conclude that the geographical difference in incidence of childhood IDDM in Europe may be associated to similar geographical differences in occurrence of ICSA both in newly diagnosed diabetic children and in their relatives. Simultaneous existence of ICSA in both patients and family members and a similar seasonality for ICSA and incidence of IDDM suggest that ICSA may reflect an ongoing disease process.

pediatric research

Islet Cell Surface Antibodies Are More Common in Patients and Relatives in Areas and during Seasons with High Incidence of Insulin-Dependent Diabetes Mellitus