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Objectives The prognostic role of interstitial pneumonia with emphysema in lung cancer is not fully understood. This study aimed to examine the prognostic role of the presence of emphysema in patients with clinical stage I lung cancer and interstitial pneumonia. Methods The presence of interstitial pneumonia and emphysema was evaluated on preoperative high-resolution computed tomography. In total, 836 consecutive patients with clinical stage I lung cancer who underwent complete resection between April 2007 and March 2016 were retrospectively analyzed using the log-rank test and Cox proportional hazard model to examine survival differences. Results There was a significant difference in 5-year overall survival between patients with interstitial pneumonia and emphysema (n = 65) and those without (n = 771) (62.6% vs. 86.5%; P &amp;lt; 0.001). However, in patients with interstitial pneumonia on high-resolution computed tomography, there was no significant difference in 5-year overall survival between patients with emphysema (n = 65) and those without emphysema (n = 50) (62.6% vs. 59.4%, P = 0.84). Multivariable backward stepwise Cox proportional hazard analysis in patients with interstitial pneumonia showed that histology, %diffusing capacity of the lungs for carbon monoxide, radiologic interstitial pneumonia pattern and surgical procedure were independent prognostic factors for overall survival, but the presence of emphysema was not. Conclusions The presence of emphysema was not an independent prognostic factor for overall survival in patients with clinical stage I lung cancer with interstitial pneumonia. Poor survival of patients with IP and emphysema may be due to the presence of interstitial pneumonia.

Prognostic role of interstitial pneumonia with or without emphysema in patients with clinical stage I lung cancer