We identified three protective alleles (HLA-DQB1*05, HLA-DRB1*01, and HLA-DRB1*07) that were less prevalent in AAA+ than AAA–subjects and two risk alleles (HLA-DRB1*03 and HLA-DRB1*011) that were more abundant in AAA+ than AAA–subjects. The gene discussed is HLA-DRB1; the disease is triple-A syndrome.