HLA-DRB1 and dermatomyositis: Given the relationship between anti-Mi-2 and HLA-DRB1*07DQA1*02DQB1*02 haplotype, HLA-DRB1*07:01 and HLA-DRB1*03:02, genetic background, as well as environmental factors, may influence the development of anti-Mi-2-positive DM.