WZ4002

WZ4002 is a novel, selective EGFR kinase inhibitor against EGFR T790M (mutation of the gatekeeper T790 residue) with IC50 of 8 nM. This agent is 30- to 100-fold more potent against EGFR T790M, and up to 100-fold less potent against wildtype EGFR, than quinazoline-based EGFR inhibitors (HKI-272 and CL-387,785) in vitro. WZ4002 inhibits EGFR, AKT and ERK1/2 phosphorylation in NSCLC cell lines and WZ4002 prevents of EGFR phosphorylation in NIH-3T3 cells expressing different EGFR T790M mutant alleles. In addition, the phosphorylated EGFR of Src TKI-resistant H1975 cells, as well as HCC827 cells, is completely suppressed by the third generation EGFR TKI, WZ4002. In a 2-week efficacy study, WZ4002 treatment resulted in significant tumour regressions compared with vehicle alone in both T790M-containing murine models.