CDH1 and breast carcinoma: Multiple studies have reported the seemingly paradoxical expression of E-cadherin in aggressive or metastatic 4T1 breast carcinoma cells (Korpal et al., 2011; Wendt et al., 2011; Chu et al., 2013; Elisha et al., 2018; Lou et al., 2008; Dykxhoorn et al., 2009; Wendt et al., 2014).