found that GADA was more prevalent in Chinese T1D patients carrying the DQA1*05-DQB1*0201 or DQA1*03-DQB1*0401 haplotype, whereas IA-2A was more prevalent in patients carrying the DQA1*03-DQB1*0303 haplotype. This evidence concerns the gene HLA-DQA1 and type 1 diabetes mellitus.