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Diabetes, Vol 48, Issue 1 170-175, Copyright © 1999 by American Diabetes Association
Relationship of beta-cell function and autoantibodies to progression and nonprogression of subclinical type 1 diabetes: follow-up of the Seattle Family Study
CJ Greenbaum, KL Sears, SE Kahn and JP Palmer
Department of Medicine, University of Washington, Seattle, USA. carlag@u.washington.edu
A total of 85 islet cell antibody (ICA)+ or insulin autoantibody (IAA)+
relatives of patients with type 1 diabetes have been followed as part of
the Seattle Family Study for a mean of 2.8 years. Of the subjects followed,
10 developed diabetes during this time period. The presence of GAD
antibodies was strongly associated with the development of diabetes. In
contrast, the presence of IAAs did not influence the risk of diabetes among
ICA+ GAD+ subjects. When either the initial absolute acute insulin response
to glucose (AIRg) or the AIR percentile, which accounts for the
individual's insulin sensitivity, was below the 10th percentile of normal
subjects, the risk of diabetes approached 50% at 5 years. However, impaired
beta-cell function did not influence the risk of diabetes among those who
were GAD+. There were 13 subjects with low AIRg and 13 subjects with two or
more antibodies who had not progressed to diabetes during the course of the
study. Other measurements of beta-cell function or demographic
characteristics were not different in this group of nonprogressors compared
with those with low AIRg who did not progress to diabetes. We conclude that
ICA+ relatives with GAD antibodies or low AIRg have a high risk for
development of diabetes, but among ICA+ GAD+ relatives, the addition of IAA
or a single determination of AIRg does not enhance the prediction of
diabetes. We suggest that prediction of diabetes risk depends on both the
type and the number of antibodies present. In addition, there are a group
of ICA+ relatives with low AIRg and/or multiple antibodies who have not
progressed to diabetes over the course of the study.

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Copyright © 1999 by the American Diabetes Association.
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