CDH1 and neoplasm: Notably, tumor cells invaded stroma-rich tissue either by collective migration with a preserved ability to form follicles (Figs S1D, S2D,D′) or by undergoing partial epithelial-mesenchymal transition (EMT) characterized by diminished expression and disrupted localization of E-cadherin (Figs S1G, S2B,B′ and S2C,D).