STAT3 and pulmonary fibrosis: Some studies demonstrate the effect of quercetin, baicalein, tanshinone IIA, and cryptotanshinone on suppressing experimental pulmonary fibrosis induced by bleomycin or silica through promoting lung tissue self-healing, modulating disturbed redox-balance in lung tissue, alleviating local inflammation, reducing collagen deposition, promoting ECM degradation, inducing pulmonary fibrosis cell apoptosis, reversing angiotensin production, and regulating multiple signaling molecules and pathways (such as TGF-beta, sphingosine kinase, SMAD, Nrf2, STAT3) [41, 42, 50–54].