HLA-DPB1 and myeloid sarcoma: In the 60 patients with available CSF examination, those with the HLA-DPB1*02 allele had significantly higher IgG indexes than those who were negative for HLA-DPB1*02 (mean 1.22 ± 0.70 vs. 0.75 ± 0.39, respectively, p = 0.02), irrespective of age of MS onset.