Additionally, based on the obtained results, we conclude that the BMP7–SMAD4–CDH1 signaling associated with the EMT process may be of key importance in the etiopathogenesis of endometriosis, and miR-542-3p may be a potential negative regulator of the BMP7–SMAD4–CDH1 axis. The gene discussed is CDH1; the disease is endometriosis.