HLA-DRB1 and myeloid sarcoma: Alleles HLA-DRB1*03 and *15 were strongly associated with high MS risk [pperm = 0.0056, OR = 1.77 (CI: 1.27–2.49) and pperm = 5.8 × 10−14, OR = 2.84 (CI: 2.17–3.72), respectively].