S100A4 and pulmonary fibrosis: In the other study on extracellular S100A4 and pulmonary fibrosis, researchers used niclosamide (20 mg/kg) to inhibit the expression of extracellular S100A4 in mice with pulmonary fibrosis, while using S100A4‐specific siRNA to inhibit the secretion of S100A4 from M2 macrophages.21