These observations are also confirmed by the results of the Cassia syndrome study, in which, in addition to the role of the HLA-C*06:02 allele, the participation of other alleles such as HLA-B*57 (significantly increased in patients, indicating the risk of developing psoriasis) and HLA-C*8 (high values found only in patients with psoriatic arthritis) was shown [164]. Here, HLA-C is linked to psoriatic arthritis.