Abstract:1125 Background: Loss of function mutations in the tumour suppressor gene PTEN or lack of PTEN expression have both been observed in a wide range of human tumours. PTEN encodes a phosphatase, whose activity antagonizes PI3 kinase signal pathway by dephosphorylation the plasma membrane lipid, phosphoinositide-3,4,5-trisphosphate (PIP3). Loss of PTEN phosphatase activity is thought to foster tumorigenesis, at least in part, by causing downstream constitutive activation of AKT. In addition to this role, PTEN has… Show more
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