A Randomized, Double-Blind, Placebo-Controlled Phase II Study to Evaluate the Efficacy and Safety of Subcutaneous JKN24011 in Patients With Moderate to Severe Chronic Obstructive Pulmonary Disease (COPD)

JKN24011 targets TSLP

Inclusion Criteria:

• Written informed consent; able and willing to comply with study procedures.
• Adults with documented COPD diagnosis and medical history consistent with guideline criteria.
• Relevant exposure history consistent with COPD (e.g., smoking and/or biomass exposure).
• On stable, guideline-based maintenance COPD therapy prior to randomization, per investigator judgment.
• Protocol-defined exacerbation history, symptom burden, and lung function at screening.

Exclusion Criteria:

• Current or past asthma, or other clinically significant respiratory disease that may confound assessment.
• Clinically significant uncontrolled comorbidities that increase risk or interfere with participation/outcomes.
• Immunodeficiency/immune dysregulation, active autoimmune disease requiring systemic immunosuppression, or significant opportunistic infection history.
• Active clinically significant infection or recent infection requiring systemic therapy; recent protocol-defined COPD exacerbation.
• Current/recent malignancy (except low-risk, adequately treated cancers per protocol) or clinically significant abnormal screening labs.
• Prohibited recent vaccines or therapies, prior relevant biologic/targeted therapy exposure, severe hypersensitivity to biologics/IMP, pregnancy/breastfeeding, or inability to comply (including substance abuse), per investigator judgment.