Phosphatase and tensin homolog (PTEN) is a tumor suppressor that is usually mutated in human cancers [90, 91] and regulates the phosphatidylinositol-3-kinase (PI3K)/AKT pathway via the dephosphorylation of phosphatidylinositol-3,4,5-triphosphate (PIP3) [92]. The gene discussed is PTEN; the disease is cancer.