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  • Title: GAD 65 antibody but not ICA positivity in adult-onset diabetic patients is associated with early progression to clinical insulin dependency.
    Author: Hatziagelaki E, Jaeger C, Maeser E, Bretzel RG, Federlin K.
    Journal: Acta Diabetol; 1996 Dec; 33(4):291-4. PubMed ID: 9033970.
    Abstract:
    Correct classification of diabetic patients in adulthood at the time of diagnosis is often difficult. Some may be initially diagnosed as having non-insulin-dependent diabetes mellitus and be treated with diet and/or oral hypoglycaemic agents (OHA) but later require insulin treatment. Islet cell antibodies and antibodies to GAD 65 have been associated with the development of insulin deficiency in this group of patients. In the present study, 150 patients with the initial diagnosis of type 2 diabetes mellitus in adulthood (30-60 years) were seen regularly over a period of 5 years in our diabetes outpatient clinic. Though treatment was started with diet or diet plus OHA, insulin therapy had to be introduced in a subset of patients. In all cases, serum obtained at the time of the initial diagnosis was analysed for islet cell antibodies and GAD 65 antibodies, as well as for thyroid and adrenal autoantibodies as possible markers for polyendocrine involvement. Islet cell antibody status, body mass index and the presence of thyroid and adrenal autoantibodies showed no significant correlation to subsequent insulin requirement (< 2 years after diagnosis). In contrast, GAD 65 antibodies were significantly associated with the occurrence of clinical insulin dependency less than 2 years after the initial diagnosis (P < 0.01), thus identifying a substantial proportion of patients requiring insulin therapy within the first 2 years after the diagnosis of type 2 diabetes. Determination of GAD 65 antibodies in patients with late-onset diabetes may contribute to their correct classification and adequate treatment.
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