EGFR and non-small cell lung carcinoma: The discovery of this mechanism of drug–resistant transmission has been highlighted and provided as a new opportunity not only to find means to counteract this phenomenon, but also to identify biomarkers of drug resistance.14, 15 Therefore, we first aimed to investigate the roles of exosomes isolated from EGFR‐TKI–resistant NSCLC cells carrying T790M mutation to transferring drug resistance to sensitive cells and explored the potential mechanisms.