ASK120067 is a novel third-generation inhibitor of EGFR T790M (L858R/T790M IC50=0.3 nM, T790M IC50=0.5 nM), with selectivity over EGFR WT (IC50=6 nM).ASK120067 potently inhibited the EGFR L858R/T790M and EGFR T790M resistant mutants, with IC50 of 0.3 nM and 0.5 nM, respectively, as well as the EGFR exon19del sensitizing mutant (IC50= 0.5 nM).ASK120067 also displayed a favorable selectivity profile against a panel of 258 kinases.ASK120067 selectively inhibits the growth of EGFR-mutant cell lines and induces apoptosis, with IC50 values of 12 nM, 6 nM and 2 nM against NCI-H1975, PC-9, and HCC827 cells, respectively.ASK120067 dose-dependently inhibited EGF-induced EGFR L858R/T790M phosphorylation and consequent activation of the downstream molecules AKT and ERK in NCI-H1975 cells, with similar or even more effective potency than osimertinib.ASK120067 (5, 10 mg/kg once daily) demonstrated profound and selective antitumor efficacy in EGFR-mutant xenograft models in vivo.
