HLA-DRB1 and systemic lupus erythematosus: Our results suggested that the HLA-DRB1*1501-DQB1*0601 haplotype is a risk factor for SLE and LN in the Jordanian SLE patients, whereas DQB1*0602 allele suppressed the immune response to SLE predisposition of DRB1*1501 as the haplotype HLA-DRB1*1501-DQB1*0602 is suggested to be a protective haplotype in the Jordanians.