CDH1 and inflammatory breast carcinoma: Using E-cadherin-expressing IBC cells (SUM149 and SUM190) cultured in Matrigel, we studied partial EMT, the transition from an epithelial (E) to hybrid epithelial/mesenchymal (E/M) phenotype, with the goal of obtaining evidence to reconcile two contradictory metastasis theories, cell cluster-based metastasis9–11 and EMT-mediated metastasis15–17, for IBC cells.