In particular, EMT was studied by analyzing the expression of E-cadherin (E-cad)—a typical marker of epithelial cells; vimentin—a typical marker of mesenchymal cells; MMP-1—one of the ten top globally upregulated genes in ATC [8,41]; and TGF-β1, whose overexpression is known to promote migration and invasion in many cancers, including ATC [8,42]. This evidence concerns the gene MMP1 and cancer.