Snai1 is encoded by the SNAI1 gene, and its expression can be induced by various signaling proteins such as epidermal growth factor, bone morphogenetic proteins (BMPs), fibroblast growth factor, hepatocyte growth factor, transforming growth factor-β (TGF-β), Notch, Wnt, TNF-α, and cytokines [81], resulting in cancer metastasis and progression. This evidence concerns the gene TGFB1 and cancer.