Clinical characteristics of the two study participants who tested negative for autoantibodies (GADA, IA-2A, and ICA) at 1 month and who converted to positivity for GADA (patient 2) at 12 months or IA-2A (patient 24 (carrier of the Arg1530Cys mutation of the ABCC8)) at 6 and 12 months after the diagnosis of type 1 diabetes. Here, ABCC8 is linked to type 1 diabetes mellitus.