They revealed an association of GCA with the expression of HLA-DRB1*04 alleles (HLA-DRB1*0401, HLADRB1*0404, and HLADRB1*0408 haplotypes) [27,28,29,30,31,32,33,34,35,36]. This evidence concerns the gene HLA-DRB1 and temporal arteritis.