HLA-DRB1 and dermatomyositis: In their studies of 52 DM and PM patients from Northern China, Han et al. reported that HLA-DRB1*04, HLA-DRB1*07, and HLA-DRB1*12 may render an increased risk of DM [10], while HLA-DQB1*0401 may have an impact on IIM susceptibility [11].