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Gefitinib resistance in HCC827 GR cells is not due to EGFR T790M mutation. (a) and (b) HCC827, PC‐9, HCC827 GR and PC‐9 GR cells were treated with gefitinib at different concentrations, and CCK‐8 assays were used to assess cell viability (a: 
HCC827 and 
HCC827 GR; b: 
PC‐9 and 
PC‐9 GR). (c) Next‐generation DNA sequencing was used to analyze EGFR for the DNA substitution corresponding to the T790M mutation.
