FSCN1 and idiopathic pulmonary fibrosis: IHC analyses revealed robust expression of FGF1 in regions of irregular lung architecture particular to IPF, including: basal cell sheets or basal cells of hyperplastic bronchioles (Fig. 4a and b) and SMA+/Fascin + myofibroblasts of fibroblastic foci, and areas of thickened bronchial epithelium.