Study of 43 PsA pts starting bDMARD shows Calprotectin was elevated in PsA, decreased w/ biologics, but had no signif correlation w/ US synovitis. Baseline calprotectin, S100A12, IL-6, IL-17A, IL-23, CXCL10 were high. Calprotectin, S100A12, IL-6 decreased w/ Rx (p < 0.05).