HLA-DRB1 and myeloid sarcoma: population.2,15,20 In a study, it was shown that significant difference in the frequencies of DRB1*1501 was detected between patients with MS and control population of Khuzestan.2 However, HLA-DRB5*01 and MS risk of this population had not any association.15 Also, we found association between DRB1*1501+-DRB5*01- and susceptibility to MS in this study.