A Study to Investigate the Effect on Lung Function of an Approved COPD Treatment (BGF, With HFA Propellant) Compared to BGF Formulated With a New Propellant (HFO) in Participants 40 to 80 Years of Age With COPD

This is a phase III, randomised, placebo-controlled, double-blind, multi-centre, 4-week, 3-way crossover pharmacodynamic study to assess the equivalence of BGF MDI HFO compared with BGF MDI HFA in participants with COPD. To demonstrate assay sensitivity, BGF MDI HFA will be compared to placebo MDI HFA for superiority in lung function, both pre- and post-dose. Eligible participants are between 40 and 80 years of age, inclusive, who have an established clinical history of COPD as defined by the ATS/ERS. Participants are required to have an FEV1/FVC ratio of < 0.70, have a post-bronchodilator FEV1 ≥ 40% and < 80% predicted normal value, have a blood eosinophil count < 300 cells/μL, and be current or former cigarette smokers with a history of at least 10 pack-years. Participants must not have had a COPD exacerbation treated with oral corticosteroids or antibiotics within 4 months prior to initiation of screening, and must not have had a COPD exacerbation that required hospitalisation within 12 months prior to initiation of screening. Eligible participants are those on treatment with LABA, LAMA, LAMA/LABA (open or fixed-dose combination), ICS/LABA (open or fixed-dose combination) inhaled maintenance therapies, or SABA, SAMA, or SAMA/SABA scheduled or as-needed inhaled therapies, or who are naïve to COPD therapy. This study will be conducted at approximately 95 sites globally. After screening, participants will be randomised 1:1:1:1:1:1 to receive study interventions in one of 6 possible treatment sequences.