CRP and dermatomyositis: Currently, myositis-specific autoantibodies, serum ferritin levels, serum Krebs von den lungen-6 (KL-6) levels, serum C-reactive protein (CRP) levels, alveolar-arterial oxygen difference (AaDO2), and chest high-resolution computed tomography (HRCT) findings were reported to be related with the diagnosis and severity in DM-ILD patients6–11.