Abstract
The HLA haplotype and its relationships with clinical, biological and immunological parameters were analyzed in a group of 87 Spanish type 1 diabetic patients at the clinical onset of the disease. The frequency of HLA-B18, DR3 and DR4 antigens was significantly increased whereas DR2, DR5 and DR7 were decreased in comparison with 189 healthy unrelated controls without family history of diabetes. DR3 showed a maximum relative risk for diabetes (5.5) whereas DR4 had a lower one (4.0). HLA-DR4 patients were younger at the time of diagnosis than DR4 negative (16.7 vs 21.4 years). We found no statistically significant relationship between HLA antigens and the other variables studied including the presence of islet cell antibodies, complement fixing islet cell antibodies, insulin autoantibodies, organ-specific antibodies, fasting and maximal glucagon stimulated C-peptide levels, initial glycemia and glycosylated hemoglobin.
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