EGFR-tyrosine kinase inhibitors (TKIs) have revolutionized the treatment for NSCLC. However, acquired drug resistance often occurs after with EGFR-TKIs. EGFR T790M and C797S mutations are most common mechanism in patients who failed from first- third- generation TKI treatments, respectively. there is no standard of care NSCLC harboring in-cis. The present case reports a 69-year-old Chinese man ...