EPCAM and breast carcinoma: Based on our previous analysis on EpCAM expression in epithelium- and mesenchyme-like breast carcinoma cell lines (Figure1) we selected two EpCAMlow cell lines for inducible lentiviral overexpression studies, i.e. MDA-MB-231 and Hs578t breast carcinoma cells, both with a mesenchymal cancer phenotype (Figure1D).