We report a rare case of fulminant type 1 diabetes associated with Graves' disease. A 38-year-old woman admitted for diabetic ketoacidosis 2 days after rapid onset had markedly elevated plasma glucose of 793 mg/d
l but HbA
1c of 5.8%. Islet cell autoantibodies were negative. Serum C peptide had decreased to <0.1 ng/m
l and urinary C peptide to 1.0 μg/day. Based on these findings, she was diagnosed with fulminant type 1 diabetes. Tachycardia remained despite fluid and insulin therapy. Thyroid function on day 6 indicated elevated thyroid hormone and positive TSH receptor antibody, yielding a diagnosis of Graves' disease. Class II HLA genotype analysis showed a haplotype with DRB1
*0405-DQB1
*0401, representing a major type 1 diabetes-susceptible haplotype. The plasma concentration of interferon-inducible protein-10 (IP-10), a T-helper 1-related chemokine, was elevated to 141 pg/ml at onset, and to 143 pg/ml after 6 months of treatment.
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