Evidence of CTGF's contribution to pulmonary fibrosis includes (1) elevated levels of CCN2 in patients with pulmonary fibrosis and higher plasma CTGF levels compared to normal controls,22 (2) increased CTGF expression in mouse models of pulmonary fibrosis induced by bleomycin and radiation,24, 25 and (3) identification of CTGF as a critical gene in pulmonary fibrosis through meta‐analysis.26 This evidence concerns the gene CCN2 and pulmonary fibrosis.