HLA-DRB1 and myeloid sarcoma: Overall, the strongest genetic factor associated with MS is the human leukocyte antigen (HLA)‐DRB1*15:01 allele (Allen et al., 1994; Mack et al., 2019; Marrosu et al., 2001; Sawcer et al., 2005; Schmidt et al., 2007).