PIK-294

PIK-294 is a highly selective p110 inhibitor with an IC50 of 3 nM. PI3K contains a m-phenol and a pyrazolopyrimidine core. When PIK-294 is compared to tyrosine kinase–selective pyrazolopyrimidines such as PP20, the two molecules span more than 108 fold in relative target selectivity. PIK-294 is 20- to 60-fold more potent than the parent compound, PIK-293, making PIK-294 one of the most potent p110δ- selective inhibitors that has been reported. PIK-294 also inhibits p110α, p110β, p110γ, DNA-PK and mTOR with IC50 of 9.6, 0.67, 0.2, 48 and >50 µM.