EGFR and non-small cell lung carcinoma: The cytotoxic effects of HGK on PC9 (EGFR Del19, TKI-sensitive), and H1975 (EGFRL858R/T790M, TKI-resistant) were compared to that of a NSCLC cell line A549 and normal fibroblasts HFF3 cells to evaluate whether HGK displays antitumor effects against NSCLC cells harboring constitutive activating EGFR mutations.