HLA-A and psoriasis: Choonhakarn et al., in a Thai population, identified the alleles HLA-A*01, A*02:07, A*30, B*08, B*13, B*46:01, B*57, C*01, C*06:02 (the strongest association), and DRB1*07 as being associated with type I psoriasis (onset before 30 years of age), while higher frequencies of A*02:07, HLA-A*30, C*01 and DRB1*14:01 were significantly associated with psoriasis onset after 30 years of age.35