HLA-DRB1 and dermatomyositis: HLA-DRB1 typing analysis showed that compared to controls, DM patients had a considerably lower prevalence of HLA-DRB1*03 (3.08% vs. 11.27%, p = 0.01, pcorr NS; OR = 0.26; 95% CI: 0.06–0.81) and a higher frequency of HLA-DRB1*07 (20.77% vs. 13.24%, p = 0.01, pcorr NS, OR = 2.26, 95% CI, 1.12–4.59).