STIP1 and psoriasis vulgaris: Relative values of serum STIP1 levels ranged from 75.2 to 286 (median: 152.5), 73.2 to 402.4 (median: 234.1), and 21.0 to 208.2 (median: 86.0) in patients with psoriasis vulgaris, psoriatic arthritis, and healthy controls, respectively (Figure 3E).