Immunohistochemistry on serial sections revealed co-localization of FGF1 with both epithelial and mesenchymal derived cells in pathogenic regions of IPF as well as co-localization with FGFR1, FGFR2, FGFR3, FGFR4, and Fascin. Here, FSCN1 is linked to idiopathic pulmonary fibrosis.