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PKI-402 is a selective, equipotent and ATP-competitive class I PI3K inhibitor (IC50= 1 nM, 7 nM, 16 nM and 14 nM for PI3Kα, PI3Kβ, PI3Kγ and PI3Kδ, respectively.)

PI3K (phosphatidylinositol-4,5-bisphosphate 3-kinase) is a family of enzymes involved in cellular functions such as cell growth, proliferation, differentiation, motility, survival and intracellular trafficking, which in turn are involved in cancer. It plays a key role in PI3K/Akt/mTOR pathway.

In multiple human cancer cell lines (e.g. breast, brain, pancreas and NSCL), PKI-402 inhibited growth of cancer cells, and attenuated phosphorylation of effector of PI3K and mTOR. In MDA-MB-361, 30 nM PKI-402 caused cleaved of the apoptosis marker—PARP.

In MDA-MB-361 mouse tumor xenograft models, administration of 100 mg/kg of PKI-402 daily for 5 days decreased the initial tumor volume from 260 mm3 to 129 mm3 and inhibited tumor regrowth for 70 days, single dose of PKI-402 blocked phosphorylation of Akt and led to cleaved PARP.

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