Conclusions NB003 has a manageable toxicity profile and promising clinical activity in heavily pretreated pts with advanced GIST harboring a broad spectrum of acquired imatinib-resistant mutations. The 20mg and 30mg BID doses are selected for further investigation in the phase I RP2D confirmation cohort.
AZD3229 has a superior potency and selectivity profile to standard of care (SoC) agents-imatinib, sunitinib, and regorafenib, as well as investigational agents, avapritinib (BLU-285) and ripretinib (DCC-2618). AZD3229 has the potential to be a best-in-class inhibitor for clinically relevant KIT/PDGFRα mutations in GIST.