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Bronchiectasis

Diagnosis and management of bronchiectasis

Author/s: 
Maeve P. Smith

Bronchiectasis is a chronic, debilitating respiratory condition that affects people of all ages. It is most prevalent in women and those older than 60 years, and prevalence is increasing. Patients have daily excessive sputum and associated symptoms, recurrent chest infections and impaired health-related quality of life. In North America, management guidelines are lacking. This review discusses best evidence to guide the long-term management of non–cystic fibrosis bronchiectasis in adults, focusing on the two most common single-entity types of bronchiectasis in adults: idiopathic and postinfectious bronchiectasis (Box 1). Table 1 lists all the types of bronchiectasis by cause.

Keywords 
Bronchiectasis sputum diagnosis management fibrosis

Exacerbation risk in patients with bronchiectasis receiving DPP-1 inhibitors vs placebo: A meta-analysis of RCTs

Author/s: 
Giulia Carvalhal, Júlia Moreira Diniz, Larissa Calixto Hespanhol, David Curi Barbosa Izoton Cabral, Jafar Aljazeeri

Background: No therapies have been approved to alter bronchiectasis progression. Dipeptidyl peptidase-1 (DPP-1) inhibitors, which target neutrophil serine protease activation, are under investigation as potential disease-modifying agents.

Methods: We conducted a systematic review and meta-analysis of randomized controlled trials (RCTs) comparing DPP-1 inhibitors versus placebo in patients with non-cystic fibrosis bronchiectasis. PubMed, Cochrane, EMBASE, Web of Science, Scopus, ClinicalTrials.gov, and ICTRP were searched from inception until April 26, 2025. Primary outcomes included time to first exacerbation and proportion of patients remaining exacerbation-free. Secondary outcomes included post-bronchodilator % Forced Expiratory Volume in 1 s (FEV1), Quality of Life-Bronchiectasis (QoL-B) questionnaire scores, and rate of adverse events. Time-to-event outcome was analyzed using Kaplan-Meier (KM)-estimated individual patient data (IPD), whereas random-effects meta-analyses were performed for remaining outcomes.

Results: 2523 patients from four RCTs were included, of whom 1689 (66.9 %) received DPP-1 inhibitors. Compared with placebo, DPP-1 inhibitors prolonged the time to first exacerbation (HR 0.79; 95 % CI: 0.71 to 0.88) and increased the proportion of patients remaining exacerbation-free (RR 1.33; 95 % CI 1.12 to 1.58). A slower decline in post-bronchodilator % FEV1 was observed (MD 1.1 %; 95 % CI 0.05 to 2.15), but no difference in QoL-B scores (MD 1.35; 95 % CI -0.72 to 3.42). The safety profile of DPP-1 inhibitors was acceptable and comparable to placebo. Moderate certainty was found across endpoints.

Conclusions: DPP-1 inhibitors prolong time to first exacerbation and reduce exacerbation rates in patients with bronchiectasis, with an acceptable safety profile. These findings support their potential as a disease-modifying strategy.

Registration: PROSPERO (CRD420251042542).

Keywords: Bronchiectasis; DPP-1 inhibitor; Dipeptidyl-peptidases and tripeptidyl-peptidases; Meta-analysis; Randomized controlled trials; Systematic review.

Keywords 
Bronchiectasis DPP-1 inhibitor Dipeptidyl-peptidases and tripeptidyl-peptidases meta-analysis
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