The efficiency results showed the median progression free survival (mPFS) of patients with EGFR+/DDR+ and EGFR+/DDR-receiving EGFR-TKIs were 6.3 months (cohort 1) and 12.0 months (cohort 2) respectively…Co-mutation of DDR genes influence the efficiency of EGFR-TKIs in NSCLC patients harboring EGFR activating mutations.