Compare Oral Itraconazole and Standard Care Versus Standard Care Alone in Patients With Non-cystic Fibrosis Related Bronchiectasis With Chronic Aspergillus Infection in Reducing Bronchiectasis Exacerbations

Overview

There is an intricate link between bronchiectasis and fungi. Patients with cystic fibrosis frequently manifest fungal sensitization and fungal colonization with Aspergillus fumigatus.6 Aspergillus species also has a cause-and-effect relationship with non-CF (cystic fibrosis) bronchiectasis.7, 8 In allergic bronchopulmonary aspergillosis (ABPA), Aspergillus is the cause of bronchiectasis. In contrast, in other causes of bronchiectasis, A fumigatus can theoretically promote allergic response, which may result in poor lung function, increase the risk of exacerbations, and even cause ABPA over time.9, 10 In a recent study, we found an overall prevalence of Aspergillus sensitization of 29.5% and the prevalence of chronic aspergillus infection was 76%.11 The prevalence of chronic aspergillus colonization in non-(tuberculosis) TB-non-CF fibrosis was 47.5% (49/103).11 By mechanism similar to chronic bacterial colonization, chronic aspergillus infection or aspergillus sensitization can increase the risk of bronchiectasis exacerbation. Therefore, eradication of A. fumigatus from the airways of patients with bronchiectasis would decrease the future risk of a bronchiectasis exacerbation. Notably, in ABPA, use of itraconazole and voriconazole reduce the exacerbations by reducing the fungal burden in the airways.12, 13 In this randomized trial, we will investigate whether treatment with oral itraconazole for six months would reduce the future risk of bronchiectasis exacerbation in patients with non-CF-non-ABPA bronchiectasis.

Bronchiectasis is a chronic lung disease due to irreversible and abnormal dilatation of the bronchi. Bronchiectasis manifest with chronic cough, expectoration, hemoptysis, dyspnea, and others. Bronchiectasis can be broadly classified as genetic (cystic fibrosis \[CF\], ciliary dyskinesia and others) or acquired (post-infective, tuberculosis (TB), allergic bronchopulmonary aspergillosis \[ABPA\] and others).1 The natural course of bronchiectasis is associated with recurrent exacerbations that cause further damage and disease progression.2 Most exacerbations are caused by viral or bacterial infections, inflammation and external environment factors. Chronic bacterial infections increase the risk of bronchiectasis exacerbation.2 In a multicentric European study chronic infection with Pseudomonas aeruginosa was associated with an increased risk of exacerbation.3 Notably, change in the interaction between the bacterial microbiome by external inciting events (viral infection or air pollution) increases exacerbation risk.4 Similarly, viral infections by increasing the systemic and airway inflammation induce a bronchiectasis exacerbation.5 Airway inflammation both neutrophilic and eosinophilic are also important causes of bronchiectasis exacerbations.2 Most previous studies in non-CF bronchiectasis have not investigated the role of fungal sensitization or chronic fungal infection in causing bronchiectasis exacerbation. There is an intricate link between bronchiectasis and fungi. Patients with cystic fibrosis frequently manifest fungal sensitization and fungal colonization with Aspergillus fumigatus.6 Aspergillus species also has a cause-and-effect relationship with non-CF bronchiectasis.7, 8 In ABPA, Aspergillus is the cause of bronchiectasis. In contrast, in other causes of bronchiectasis, A fumigatus can theoretically promote allergic response, which may result in poor lung function, increase the risk of exacerbations, and even cause ABPA over time.9, 10 In a recent study, we found an overall prevalence of Aspergillus sensitization of 29.5% and the prevalence of chronic aspergillus infection was 76%.11 The prevalence of chronic aspergillus colonization in non-TB-non-CF fibrosis was 47.5% (49/103).11 By mechanism similar to chronic bacterial colonization, chronic aspergillus infection or aspergillus sensitization can increase the risk of bronchiectasis exacerbation. Therefore, eradication of A. fumigatus from the airways of patients with bronchiectasis would decrease the future risk of a bronchiectasis exacerbation. Notably, in ABPA, use of itraconazole and voriconazole reduce the exacerbations by reducing the fungal burden in the airways.12, 13 In this randomized trial, we will investigate whether treatment with oral itraconazole for six months would reduce the future risk of bronchiectasis exacerbation in patients with non-CF-non-ABPA bronchiectasis. Study question: Does oral itraconazole for six months reduce the bronchiectasis exacerbation in patients with non-cystic fibrosis bronchiectasis?