HLA-DRB1 and myeloid sarcoma: In a large genome-wide association study (GWAS), 465,434 autosomal single nucleotide polymorphisms (SNPs) were analyzed in 9772 cases and 17,376 controls of European descent; the strongest association was between HLA-DRB1*1501 and MS (OR = 3.1, P = 1 × 10−320)3.