NCIt definition : An orally bioavailable pan inhibitor of phosphatidylinositol-3-kinase (PI3K), with
potential antineoplastic activity. Upon oral administration, pan-PI3K inhibitor CLR457
inhibits all of the PI3K kinase isoforms, which may result in apoptosis and growth
inhibition in tumor cells overexpressing PI3K. Activation of the PI3K pathway promotes
cell growth, survival, and resistance to both chemotherapy and radiotherapy.;