Liu et al. [96] found that the HCP5 G2V polymorphism at rs2395029 had the highest odds ratio with both psoriasis (PS) and psoriatic arthritis (PSA) for 223 Caucasian individuals, and its effect was independent (not in significant LD) of the most highly associated SNP rs10484554 that was 34.7 kb upstream of HLA-C. Here, HCP5 is linked to psoriatic arthritis.