A few cohort studies of psoriatic patients from European and Chinese lineages have revealed that psoriasis and psoriatic arthritis patients have the human leukocyte antigen (HLA)-class I allele HLA-C∗06:02 susceptibility locus, which is linked to the presentation of LL-37 autoantigen (Lande et al., 2007, 2014; Mabuchi and Hirayama, 2016; Fuentes-Duculan et al., 2017). The gene discussed is CAMP; the disease is psoriasis.