A significant association has been established between insulin-dependent diabetes and HL-A. This was appraised in a selected series of 16 patients and 64 of their first-degree relatives by HL-A typing. The relatives also underwent a glucose tolerance test. The results showed a high incidence of B8 in the patients (31%, VS 15% in controls: p less than 0.01). A previously observed prevalence of Bw 15, however, was not noted. In addition, an increased incidence of Bw 35 was detected (38%, VS 23% in the controls: p less than 0.02). In the case of the relatives, no significant differences in HL-A frequency were apparent, nor could a relationship between HL-A phenotype and altered glucose tolerance be established. The true aetiopathogenetic significance of this association is discussed in the light of recent views concerning HL-A and diseases.
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