In vitro and in vivo anti-tumor efficacy was determined in drug-resistant mutant cell lines, CDX and PDX models. Single mutants (Del or L858R), double mutants (Del/T790M or L858R/T790M) and triple mutants (Del/T790M/C797S or L858R/T790M/C797S)...H002 was highly active against all forementioned single, double or triple EGFR mutants (IC50 < 5 nM)...H002 also exhibited potent anti-tumor effects in a dose-dependent manner in various CDX and PDX models....H002 has been demonstrated as a promising next generation EGFR inhibitor, with high selectivity, a wide spectrum and potent anti-tumor activity against various EGFR activating mutations, favorable DMPK and safety profiles.