HLA-DRB1 and myeloid sarcoma: Compared with HCs, MS patients showed a significantly higher frequency of the DRB1*0405 allele (pcorr = 0.0196, OR  = 2.217, 95% CI  = 1.389–3.539) and a significantly lower frequency of the DRB1*0901 allele (pcorr = 0.0084, OR  = 0.279, 95% CI  = 0.135–0.575) (Table 2).