Previous studies focusing on AIH identified susceptible HLA allele associations for HLA-DRB1*04:01 and HLA-DRB1*04:05 in a Japanese population (18), HLA-DRB1*03:01 and HLA-DRB1*04:01 in a European population (45), and HLA-DRB1*04:04, -DRB1*04:05 and -DRB1*13:01 in Latin-American populations (21, 46–48). Here, HLA-DRB1 is linked to autoimmune hepatitis.