ACTA1 and idiopathic pulmonary fibrosis: However, Yamada et al. [20] obtained conflicting results and did not detect double-positive cells for E-cadherin, ICAM-1, LEA CD44v9, SP-A, α-SMA, or vimentin in lung tissues from patients with idiopathic pulmonary fibrosis and nonspecific interstitial pneumonia.