Objective: Identifying risk factors for cancer treatment-related acute exacerbations (AEs) of idiopathic interstitial pneumonia (IIP) in patients with lung cancer.
Methods: We retrospectively reviewed clinical records of 98 patients with concurrent lung cancer and IIPs diagnosed and treated at the Sapporo Medical University Hospital from January 2010 to December 2014.
Results: Of the 98 patients with concurrent lung cancer and IIPs, 14 patients (14.3%) had AEs. A total of 10 patients died. The univariate analysis revealed that the patients with idiopathic pulmonary fibrosis (IPF) or usual interstitial pneumonia (UIP) patterns on chest computed tomography (CT) had significantly higher rates of AE than those with non-IPF or non-UIP patterns, respectively. Further, those with a reduced percentage of forced vital capacity (%FVC) predictive values or elevated Krebs von den Lungen-6 (KL-6) presented significantly higher rates of AE. Our multivariate analysis identified that UIP pattern on chest CT and each 10% decrease in %FVC were significant independent risk factors for AEs. Of the 14 patients who experienced AEs, 10 cases were associated with cancer treatment. The treatment-specific incidences were 3/40 (7.5%) for surgery, 5/50 (10.0%) for chemotherapy, and 2/26 (7.7%) for radiation therapy. After comparing the AE incidences in 55 cases receiving one treatment (monotherapy group) and in 29 cases receiving two types of treatment or more (multitherapy group), we found no significant differences.
Conclusions: Chest CT UIP patterns and reduced %FVC are independent risk factors for AE. Moreover, AE incidence did not increase in the multitherapy group compared with the monotherapy group.
Keywords: acute exacerbation; idiopathic interstitial pneumonia; lung cancer.
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