SERPINH1 and idiopathic pulmonary fibrosis: The HSP47 expression level was examined in interstitial pneumonias of various etiologies characterized by distinct pathological patterns, such as idiopathic UIP (I-UIP), collagen vascular disease-associated UIP (CVD-UIP), and idiopathic nonspecific interstitial pneumonia (I-NSIP) [46].