RESULTS: 172 patients were diagnosed with COPD (124 as GOLD-1, 46 as GOLD-2, and 2 as GOLD-3). The frequencies of recurrence were significantly higher in relation to higher COPD grades (P < 0.001). Recurrence-free survival at five years was 78.1%, 70.4%, and 46.4% in Non-COPD, mild COPD, and moderate/severe COPD groups, respectively (P < 0.001). In univariate analysis, age, gender, smoking history, COPD severity, tumor size, histology and pathological stage were associated with recurrence-free survival. Multivariate analyses showed that older age, male, moderate/severe COPD, and advanced stage were independent risk factors associated with recurrence-free survival.