HLA-DRB1 and psoriasis: Likewise, genes located farther from HLA-C at the centromeric end, including TNF-α (tumor necrosis factor-alpha) [21],[22], AGER (receptor of advanced glycosylation end product-specific receptor) [23], HLA-DRB1, HLA-DQA1 and HLA-DQB1[24],[25],[26],[27], have also been found to be associated with psoriasis.