We observed a significant pro-proliferative effect of PDGF-BB (p < 0.05, Figure 2A,) and bFGF (p < 0.05, Figure 2C,) in primary IPF lung fibroblasts, as well as in cells from non-fibrotic control lungs (p < 0.05, Figure 2B [PDGF-BB]; p < 0.05, Figure 2D [bFGF]). Here, FGF2 is linked to idiopathic interstitial pneumonia.