HLA-A and ankylosing spondylitis: There exists more clear evidence regarding the risk conferred by HLA-ABC alleles to other autoimmune diseases, with associations reported for HLA-B*27 and ankylosing spondylitis [46], HLA-C*06:02 and psoriasis [47], HLA-B*51 and Behçet’s disease [48], and HLA-A*29 with birdshot chorioretinopathy [49].