Roche Reports Mixed Results for Astegolimab in COPD Clinical Trials
SHERIDAN, WYOMING – July 25, 2025 – Roche has announced topline results from two pivotal clinical trials evaluating astegolimab for chronic obstructive pulmonary disease (COPD), highlighting a complex development path for the investigational monoclonal antibody. The phase IIb ALIENTO trial met its primary endpoint, while the phase III ARNASA trial did not, despite both showing numerical reductions in exacerbation rates.
Phase IIb ALIENTO Achieves Statistically Significant Reduction in Exacerbations
The ALIENTO study, which enrolled 1,301 patients, demonstrated a statistically significant 15.4% reduction in the annualised exacerbation rate (AER) over 52 weeks when astegolimab was administered every two weeks on top of standard COPD maintenance therapy. The patient population included both current and former smokers, regardless of blood eosinophil count, with a history of frequent exacerbations.