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Clinicopathologic Characteristics of Non-small Cell Lung Cancer in Patients with Smoking-related Chronic Obstructive Pulmonary Disease

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Abstract

Background: The purpose of this study was to clarify the clinicopathologic characteristics of non-small cell lung cancer (NSCLC) patients with smoking-related chronic obstructive pulmonary disease (COPD) and to evaluate the biological behavior of this disease. We investigated the association between smoking-related COPD, the recurrence-free proportion (RFP) and the clinicopathological features of clinical stage I NSCLC patients.

Methods: Between 2005 and 2014, 218 consecutive patients with clinical stage I NSCLC underwent complete resection with lobectomy or greater and systematic lymph node dissection. Differences in categorical outcomes were evaluated by the χ test. RFPs were estimated using the Kaplan-Meier method, and differences were evaluated using the log-rank test.

Results: The 5-year RFP of clinical stage I NSCLC patients with smoking-related COPD was 55%, which was significantly lower than in those without smoking-related COPD (85%; p < 0.001). Postoperative pathological factors, including moderate or poor histological differentiation, intratumoral vascular invasion and lymph node metastasis, were detected more often in patients with smoking-related COPD. In adenocarcinoma patients, the 5-year RFP of patients with smoking-related COPD was 47%, which was significantly lower than in those without smoking-related COPD (87%; p < 0.001). The presence of a solid component was more frequently found in patients with smoking-related COPD (p = 0.007).

Conclusion: Clinical stage I NSCLC patients with smoking-related COPD have histologically more invasive tumors than those without smoking-related COPD.

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