ZEB1 and breast cancer: It remains to be seen whether the regulation of Zeb1/δEF1 involves the miR-200 family and miR-205, recently shown to regulate TGFβ-induced EMT of mammary and ovarian epithelial cells by targeting Zeb1/δEF1 and SIP1, and shown to be downregulated in regions of breast cancer specimens with E-cadherin loss.