The clinical data of 36 NSCLC patients with EGFR mutation who received TKI treatment were retrospectively analyzed....Of the 32 patients who continued to receive EGFR-TKI treatment, 15 received third-generation TKI, including 13 patients with positive EGFR T790M mutations...Patients with T790M mutations achieved longer PFS than EGFR T790M mutation-negative patients…