Gefitinib for EGFR Sensitive Mutation Postoperative Stage Ib NSCLC Patients

Currently, whether adjuvant therapy should be applied to Stage Ib non-small cell lung cancer (NSCLC) patients who received radical resection remains controversial. There is still no clear evidence that the postoperative adjuvant chemotherapy or other treatments can improve the survival rate for patients with stage Ib NSCLC. Tyrosine Kinase Inhibitors (TKIs) such as Gefitinib and Erlotinib are widely accepted as the first-line therapy for Epidermal growth factor receptor (EGFR) gene mutation late stage NSCLC patients. However the effect is largely uncertain for early stage patients who received surgery. The investigators aim to evaluate the effect of postoperative adjuvant use of Gefitinib for high risk stage Ib EGFR sensitive mutation NSCLC patients.