Phosphoprotein phosphatase 2A (PP2A), a major serine/threonine phosphatase, appears to be critically involved in cellular growth control and potentially in the development of cancer through regulating a broad array of biological processes such as the cell cycle, DNA replication, transcription and translation, signal transduction, cell proliferation, cytoskeleton dynamics and cell mobility and apoptosis [19,20,21,22]. This evidence concerns the gene PTPA and cancer.