Therefore, the aim of this study was to analyze the expression, localization, and correlations of BMP7, SMAD4, CDH1, and miR-542-3p in ectopic and eutopic endometrial tissues from the proliferative and secretory phase endometrium of women with endometriosis as well as in peripheral blood mononuclear cells (PBMCs) obtained from patients with endometriosis and without the disease. The gene discussed is CDH1; the disease is endometriosis.