HLA-B and psoriasis: Helms observed in the study that, although HLA-C∗06:02 was found in the majority of overtransmitted haplotype harboured by HLA-C∗12:03, HLA-C∗12 was also associated with HLA-B alleles that play a role in psoriasis (HLA-B∗38:01 and HLA-B∗901).