EGFR and lung cancer: The pathological results are shown in Table 2 and Figure 14: microscopic adenular, papillary and adherent structures, most basal cells, mucous cells, ciliated cells and alveolar epithelial cells, some tumors with basal cell hyperplasia or scalation, immunohistochemical TTF-1, CK7, p63 positivity, 90.5% of cases Ki67 < 5%, the most mutated gene was BRAF (30.3%) and epidermal growth factor receptor (EGFR) (45.4%).One case underwent postoperative chemotherapy for lung cancer, while other cases did not receive special postoperative treatment.