HLA-DRB1 and myeloid sarcoma: Compared with HCs, CSF IgG abnormality-positive MS patients showed a significantly higher frequency of the DRB1*1501 allele (pcorr = 0.0392, OR  = 2.624, 95% CI  = 1.432–4.809), whereas CSF IgG abnormality-negative MS patients showed a significantly higher frequency of the DRB1*0405 allele (pcorr = 0.0056, OR  = 3.660, 95% CI  = 1.802–7.431) (Table 2).