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Characterization of bronchiectasis in lung cancer using German claims data
Jeremias Götschke1, Julia Walter1, Kathrin Kahnert1
1Department of Medicine V, LMU University Hospital, Comprehensive Pneumology Center (CPC-M), Member of the German Center for Lung Research (DZL), Munich, Germany.
Scientific Reports
|January 9, 2026
Summary
Bronchiectasis does not impact lung cancer survival if pre-existing, but newly diagnosed bronchiectasis worsens outcomes. Patients with bronchiectasis need close monitoring for pneumonia, a common complication.
Area of Science:
- Pulmonology
- Oncology
Background:
- Bronchiectasis is a chronic lung disease causing bronchial enlargement and respiratory issues.
- The effect of bronchiectasis comorbidity on lung cancer prognosis is not well understood.
Purpose of the Study:
- To investigate bronchiectasis's role in lung cancer survival, pneumonia incidence, and healthcare costs.
- To differentiate outcomes based on the timing of bronchiectasis diagnosis relative to lung cancer.
Main Methods:
- Retrospective analysis of 36,272 German lung cancer patients using claims data.
- Propensity score matching (1:1) for patients with and without bronchiectasis.
- Kaplan-Meier curves, Log-Rank test, McNemar test, and paired t-tests for survival, pneumonia, and cost analysis.
Main Results:
- Pre-existing bronchiectasis showed no significant survival difference in lung cancer patients.
- Newly diagnosed bronchiectasis (POST cohort) significantly increased mortality risk (HR=2.22).
- Bronchiectasis patients had higher pneumonia rates during therapy and increased healthcare costs, though cost differences diminished after survival adjustment.
Conclusions:
- Pre-existing bronchiectasis is not a negative prognostic factor for lung cancer survival.
- Incident bronchiectasis developing during lung cancer treatment is linked to worse survival.
- Close monitoring for infectious complications, especially pneumonia, is crucial for lung cancer patients with bronchiectasis.
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