Adjuvant Chemotherapy With or Without Intercalated Icotinib

Patients receive 4 cycles of platinum-based doublet chemotherapy on day 1 with intercalated icotinib (D8-15) every 3 weeks, and continued icotinib for 2 years or until the occurrence of disease relapse, metastasis or unacceptable icotinib or chemotherapy toxicity

Patients receive 4 cycles of platinum-based doublet chemotherapy on day 1 with intercalated placebo (D8-15) every 3 weeks, and continued placebo for 2 years or until the occurrence of disease relapse, metastasis or unacceptable toxicity

Patients in each groups need to receive 4 cycles of platinum-based doublet chemotherapy