Overexpression of SNAIL1 in breast cancer cell lines led to the loss of E‐cadherin‐mediated cell–cell adhesion, a dramatic change from epithelial to mesenchymal spindle morphology, and an increase in migratory and invasive phenotype (Batlle et al., 2000; Cano et al., 2000). The gene discussed is SNAI1; the disease is breast cancer.