Completely resected stage II~IIIA lung adenocarcinoma with EGFR-tyrosine kinase (TKI) sensitizing mutation (mEGFR) is treated with cisplatin-based adjuvant chemotherapy, which is similar to other non-small cell lung cancers irrespective to the EGFR mutation status. The gene discussed is EGFR; the disease is non-small cell lung carcinoma.