CD1C and psoriatic arthritis: An evaluation of miR-34a expression in blood and synovial tissue CD1c+ cells from patients with comparator inflammatory joint disease, psoriatic arthritis (PsA) showed no significant changes in the blood but an increase in expression in synovial tissue DCs although to a lesser degree than in RA (P=0.02; Kruskal–Wallis with Dunn’s multiple comparison test; Supplementary Fig. 2).