SNAI1 and adenomyosis: Its downregulation may be involved in epithelial–mesenchymal transition (EMT) in EMs, possibly through the preferential translation of snail (an inhibitor of E-cadherin) (Cai et al., 2018) and involved in the development of adenomyosis through activating the TGF-β1 signaling pathway (Cai et al., 2019).