HLA-DRB1 and rheumatoid arthritis: RA associated HLA-DRB1 alleles were, by order of Odds Ratios, HLA-DRB1*04∶08 (OR = 10.3), HLA-DRB1*04∶01 (OR = 3.3), HLA-DRB1*04∶05 (OR = 3.3), HLA-DRB1*10 (OR = 2.9), HLA-DRB1*04∶04 (OR = 2.8), HLA-DRB1*09 (OR = 2.1), HLA-DRB1*01 (OR = 1.5) (Table 2).