Furthermore, Snail1 nuclear expression was found in invasive ductal carcinomas (Blanco et al., 2002) and in basal‐like breast tumors contexts (Becker et al., 2007; Geradts et al., 2011) and correlated with lymph and cervical node and distant metastasis of breast and head and neck squamous cell carcinoma (HNSCC) (Yang et al., 2007), or even in stromal cells close to invasive areas (Franci et al., 2006). This evidence concerns the gene SNAI1 and head and neck squamous cell carcinoma.