The expression of Cox2 and Hmox1 was examined in primary IPF or non‐IPF lung fibroblasts with or without EZH2 inhibitor EZP6438, O‐GlcNAc transferase (OGT) inhibitor (OSMI‐1) or O‐GlcNAcase (OGA) inhibitor (thiamet G). This evidence concerns the gene HMOX1 and idiopathic pulmonary fibrosis.