IGF1 and pulmonary fibrosis: In organ fibrosis such as renal fibrosis, pulmonary fibrosis, hepatic fibrosis and ocular fibrosis, EMT is triggered by various biomolecules and signaling pathways, such as transforming growth factor-β (TGF-β) [13], insulin-like growth factor-1 (IGF-1) [14], transcription factor snail [15], and PI3K/Akt/mTOR/NF-κB signaling [16].