EGFR and neoplasm: In EGFR mutant and non-mutant groups, older age, ND2a-2 (versus ND2a-1), larger total tumor size of >3 cm (versus ≤3 cm), pure solid nodule (versus nodule with GGO), pathological stage IB (versus IA), pleural indentation-positive (versus negative), and vascular invasion-positive (versus negative) were significantly frequent in the UFT adjuvant group compared with the observation group.