CCL2 and idiopathic interstitial pneumonia: Markers of pulmonary vasculopathy, such as vascular cell adhesion molecule 1 (VCAM-1), monocyte chemoattractant protein 1 (MCP-1), and asymmetric dimethylarginine (ADMA), have been reported as useful biomarkers of ILD in RA patients and can help in the differential diagnosis of RA-ILD from IPF [108].