A genome-wide association study (GWAS) in 649 adults with AIH from the Netherlands identified human leukocyte antigen (HLA) loci, HLA-DRB1*0301 and HLA-DRB1*0401, as susceptibility genotypes12, which was in line with other genetic studies on AIH13–15. This evidence concerns the gene HLA-DRB1 and autoimmune hepatitis.