EGFR and neoplasm: In both the younger and older groups, the rates of EGFR mutations were higher in patients with larger tumors (tumor diameter >2 cm), mixed GGOs (CTR ≤0.5 and CTR >0.5), and IAC pathological type than in patients with smaller tumors (tumor diameter ≤2 cm), pure GGOs, and noninvasive adenocarcinoma pathological type.