HLA-DRB1 and multiple sclerosis: The HLA DRB1*08 allele was more frequently documented among the RR MS patients than among the patients with the progressive forms of MS (P = 0.014), while the HLA DRB1*15 allele was more prevalent among the patients with the progressive forms of MS (P < 0.001) (See Additional file 2: Table S2 for the original data of prevalence of HLA DRB1 alleles in patients with multiple sclerosis according to the course of the disease).