CDH1 and endometriosis: In view of the fact that the characteristic feature of EMT is the functional loss of E-cadherin expression in epithelial cells [18,22] and, in turn, that EMT is the prerequisite for the primary establishment of endometrial lesions [14], we evaluated the expression profile of this gene in ectopic and eutopic endometrium samples of women with endometriosis and in control samples.