CRP and dermatomyositis: The global disease activity of DM patients significantly correlated with Siglec-1 (r = 0.563; p = 0.001) and LDH (r = 0.436; p = 0.014), but not with CK (r = 0.269; p = 0.143) and CRP (r = 0.119; p = 0.523), i.e., the best biomarker reflecting disease activity was Siglec-1.