CAMP and Arthritis: As shown in Figure 1A, higher levels of LL37 were detected in the synovial fluids (SF) of PsA (median: 0.153, IQR: 0.114) compared to control osteo-arthritis (OA) patients (median: 0.1, IQR: 0.036), p = 0.031, by ELISA assay.