Compared with normal tissues, the mRNA expression level of the epithelial cell marker Cdh1 (coding E‐cadherin) was decreased, while the levels of EMT‐related genes, including Tgfbi, Mmp10, Lamc2, Lamb3, Cdh2 (coding N‐cadherin) and Vim (coding vimentin), were significantly increased in AOM/DSS‐induced polyps (Figure 6H). This evidence concerns the gene MMP10 and infectious otitis media.