CXCL10 and dermatomyositis: The type 1 IFN signature in whole blood of three mixed DM and JDM cohorts correlated weakly to moderately with global disease activity [spearman r (rs) = 0.33–0.44] and muscle activity (rs = 0.44–0.47), while single IFN signature related serum chemokines MCP-1, IP-10 (CXCL10) and ITAC (CXCL11) had moderate to strong correlations with global (rs = 0.42–0.66), muscle (rs = 0.44–0.50), and extraskeletal disease activity (rs = 0.42–0.55) (115– 117).