HLA-DRB1 and myeloid sarcoma: The OR of MS in individuals with high anti-EBV antibody titres is increased in HLA-DRB1*1501 positive (OR = 7.90, 95% CI = 4.11–15.21) compared to HLA-DRB1*1501 negative individuals (OR = 3.04, 95% CI = 1.99–4.63, Figure 2, Table 1).