OBJECTIVEDiabetes-associated autoantibodies can be detected in adult-onset diabetes, even when initially non-insulin requiring, i.e., with latent autoimmune diabetes. We aimed to identify adult-onset autoimmune diabetes in patients with established "type 2 diabetes" participating in the Collaborative Atorvastatin Diabetes Study (CARDS) to characterize their phenotype and clinical outcome. RESEARCH DESIGN AND METHODSWe prospectively studied 2,425 European patients with presumed type 2 diabetes (mean age 62 years, diabetes duration 7.9 years) for outcomes at 3.9 years after randomization to either atorvastatin or placebo. Subjects were screened for autoantibodies to GAD (GADA), insulinoma-associated antigen-2 (IA-2A), and zinc-transporter 8 (ZnT8A). RESULTSA total of 173 patients (7.1%) had GADA, of whom 11 (0.5%) and 5 (0.2%) were also positive for IA-2A and ZnT8A, respectively. At baseline, 44% of GADA-positive patients were not on insulin. Fewer autoantibody-positive than autoantibodynegative patients had metabolic syndrome (64 vs. 80%), and more were on insulin (56 vs. 17%) (P < 0.0001 for each) without lower HbA 1c (69 mmol/mol [8.5%] vs. 62 mmol/mol [7.8%]). The frequency of microvascular and macrovascular events was similar in both cohorts, independent of atorvastatin.
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