Anti-ST2 (MSTT1041A) in COPD (COPD-ST2OP)

This is a single-centre, double-blind, placebo- controlled, parallel group, randomised controlled trial to assess the efficacy and safety of anti-ST2 compared to placebo, in patients with moderate to very severe COPD (GOLD II-IV). Anti-ST2 will be administered via subcutaneous injection once every 4 weeks (Week 0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, and 44) during the 48-week treatment period. Participants will be followed up for 60 weeks (i.e. 48 week treatment period and 12 week follow-up), with secondary outcome measures at baseline, 4, 12, 24, 36, 48 and 60 weeks and at exacerbation events presenting prior to treatment initiation. After signing the informed consent at the initial visit, patients will enter a screening period which should last for up to 2 weeks unless extension of the screening period is necessary under certain circumstances. Patients who qualify to participate in the study will be randomised into a 48-week treatment period in which they will receive either 490 mg anti-ST2 or a matching placebo. Patients will be evaluated for an additional 12 weeks following completion of the randomised treatment period. Treatment groups will remain blinded until the 60-week follow-up period is completed, and trial database is locked. This trial is sponsored by the University of Leicester, coordinated by the National Institute for Health Research (NIHR) Biomedical Research Centre (BRC) - Respiratory and Leicester Clinical Trials Unit (LCTU) and funded by Genentech, Inc. The primary objective of the study is to evaluate the efficacy of anti-ST2 versus placebo on frequency of moderate-to-severe exacerbations (health care utilisation resulting in treatment with systemic corticosteroids and/or antibiotics or hospitalisation, respectively) as add-on to standard of care. Secondary objectives: another key objective is to assess the safety and tolerability of subcutaneous (SC) doses of anti-ST2 compared to placebo in adult patients with moderate to very severe COPD. Additionally, to assess the effects of anti-ST2 versus placebo both during stable visits and at the exacerbation events on the following: 1. Symptoms 2. Health status 3. Lung function 4. Inflammatory cell differentials i. Sputum cell count ii. Blood cell count 5. Airway morphometry 6. Pharmacogenomics Exploratory objectives include: 1. Systemic inflammation 2. Upper airway inflammation 3. Airway infection and ecology 4. Breath volatile organic compound profiling 5. Quantitative airway geometry and densitometry 6. Pharmacogenomics 7. Pharmacokinetics and ADA level 8. Pharmacogenomics response analysis in subgroups determined by SNPs for alleles associated with the IL33/ST2 axis. Subgroup objectives: to evaluate the efficacy of anti-ST2 versus placebo on the outcome rate of protocol-defined COPD exacerbations through 48 weeks treatment period, patient reported outcomes (PROs) \[SGRQ-c\], and lung function \[FEV1\] in subgroups defined by baseline blood eosinophil count.