HLA-DRB1 and vitiligo: GWAS from vitiligo patients (mainly from a European-derived white population and Han Chinese population) identified 50 confirmed loci that included CTLA4, interferon regulatory factor 4 (IRF4), MHC class 1 (HLA-A, HLA-B, and HLA-C), MHC class 2 (HLA-DRB1, HLA-DQA1, HLA-DQB1, and HLA-DRA), zinc finger protein Eos (IKZF4; transcription factor expressed in regulatory T lymphocytes), and GZMB [2,61].