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Acute exacerbation (AE) of idiopathic pulmonary fibrosis (IPF) in lung cancer patients is a critical factor in post-operative mortality. The cause of AE development is unknown and AE may occur in patients without the diagnosis of IPF. We have conducted a retrospective study of consecutive patients who underwent lung cancer surgery since January 2004. Sixty-two patients with fibrous findings in preoperative high-resolution computed tomography were enrolled in the present study and clinicopathological factors were analysed. AE was observed in 6 of 62 patients. The frequency of AE according to the type of fibrous changes classification was 1/7 in the usual interstitial pneumonia (UIP) pattern, 1/16 in the cellular non-specific interstitial pneumonia (NSIP) pattern, 4/25 in the fibrotic NSIP pattern and 0/14 in the unclassified or focal fibrous changes pattern. Preoperative Krebs von den Lungen-6 (KL-6) was higher in patients with AE than in those without AE. In patients who underwent partial resection, AE did not develop even with high KL-6 levels. In conclusion, in patients with both the UIP and the NSIP patterns, AE development is possible. In patients with a high risk of AE, such as those with high KL-6 values, limited surgery may be an option to prevent AE development.

Post-operative acute exacerbation of pulmonary fibrosis in lung cancer patients undergoing lung resection