CD163 and dermatomyositis: Interestingly, we found that serum CD163 levels were significantly higher in PM/DM patients (median value/IQR 770.0 ng/ml, range 212.6 to 2033.1 ng/ml) compared to healthy controls (median value/IQR 544.0 ng/ml, range 313.0 to 859.8 ng/ml) (P <0.01) (Figure 1K), and serum CD163 levels were found to be negatively correlated (r = −0.49, P <0.001) with serum TWEAK levels in PM/DM patients (Figure 1L).