HLA-DRB1 and myeloid sarcoma: Stepwise conditional modeling indicated that after conditioning on the stronger dominant effect of HLA-DQB1*06:02 in Hispanics (dominant OR = 2.70, p = 2.66 x 10−24), a residual association of HLA-DRB1*15:01 with MS risk remained (additive OR = 1.83, p = 9.63 x 10−04) (Table 1).