A Study to Investigate Airway Inflammation With Dupilumab Subcutaneously in Participants Aged ≥40 to ≤85 Years With Chronic Obstructive Pulmonary Disease.

Inclusion Criteria: Participants with a physician diagnosis of Chronic Obstructive Pulmonary Disease (COPD) who meet the following criteria at screening: * Current or former smokers with a smoking history of ≥10 pack-years * Moderate-to-severe COPD (post-BD FEV1/FVC ratio \<0.70 and post-BD FEV1 % predicted \>30% and ≤70%) * Medical Research Council Dyspnea Scale grade ≥2 or COPD assessment test (CAT) score ≥10 * Global Initiative for Chronic Obstructive Lung Disease (GOLD) category E , Frequent or severe exacerbations * Background triple therapy (ICS + LABA + LAMA) for 3 months before randomization with a stable dose of medication for ≥1 month before Visit 1; dual therapy (LABA + LAMA) allowed if ICS is contraindicated * Evidence of Type 2 inflammation: Participants with blood eosinophils ≥300 cells/μL at screening or with blood eosinophils ≥150 cells/μL at Visit 1 (screening) and with a history of blood eosinophils ≥300 cells/μL within the past year during stable state (non-exacerbation). * Mucus score cutoff of ≥3 Exclusion Criteria: * A current diagnosis of asthma according to the Global Initiative for Asthma diagnostic (GINA) guidelines, or documented history of asthma * Significant pulmonary disease other than COPD (eg, lung fibrosis, sarcoidosis, interstitial lung disease, pulmonary hypertension, bronchiectasis, Churg-Strauss Syndrome) or another diagnosed pulmonary or systemic disease associated with elevated peripheral eosinophil counts * Treatment with oxygen \>…