In addition, besides its predominant role as a lipid phosphatase, PTEN function as a protein phosphatase is presumed on some protein targets, often involved in cancer, such as focal adhesion kinase (FAK), beta-catenin, insulin receptor substrate (IRS1), platelet-derived growth factor (PDGF) receptor, or protein tyrosine kinase 6 (PTK6), among others [5,6,7]. Here, PTK6 is linked to cancer.