Protein Phosphatase 2 A (PP2A) is the most expressed PSTP and described as a tumour suppressor in several cancers, e.g. breast, lung and melanomas [10] due to its role in inhibiting signal transduction pathways such RAF-MEK-ERK and Ras/PI3K/PTEN/Akt/mTOR. This evidence concerns the gene PTEN and neoplasm.