While in other populations, there are various risk variants, or they do not contain only the DRB1*1501 allele; as in the Sardinia population where MS was correlated with the HLA-DRB1*0405-DQA1*0501-DQB1*0301 and HLA-DRB1*0301-DQA1*0501-DQB1*0201 haplotypes (20). The gene discussed is HLA-DRB1; the disease is myeloid sarcoma.