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Given the potential link between genetic risk factors and clinical features of systemic lupus erythematosus (SLE), this study aimed to explore the relationship between human leukocyte antigen (HLA)-DRB1/DQB1 alleles and haplotypes and clinical sub-phenotypes of the disease in a group of Iranian SLE patients. HLA-DRB1 and HLA-DQB1 alleles were determined by PCR-SSP in 127 SLE patients and 153 ethnically-matched healthy controls. The relationships between various clinical manifestations and HLA alleles/haplotypes were analyzed in the patients. We observed the