Mepolizumab for COPD Hospital Eosinophilic Admissions Pragmatic Trial

Patients admitted to hospital with an exacerbation of COPD are at high risk of readmission, of which a proportion are driven by eosinophilic inflammation. Whilst oral corticosteroids are beneficial in exacerbations, a considerable proportion of patients experience treatment failure, with 50% of patients readmitted within 3 months (www.RCPLondon.ac.uk). Therapy, such as mepolizumab, reduces eosinophil count and has been shown to reduce exacerbation frequency when given in the stable state in both eosinophilic asthma (Papi et al. 2018) and COPD (Yousef, in press). The investigators hypothesise that starting mepolizumab at the time of a hospitalisation for an exacerbation of COPD in patients with significant eosinophilia will result in a reduction in readmission to hospital in a high risk population. Therefore, 238 participants will be recruited over an 18-month period and will be randomised into a 48-week treatment period in which they will receive monthly subcutaneous injections of either 100 mg mepolizumab or placebo. Secondary outcomes will be measured at baseline (week 0), 4 weeks, 8 weeks, 12 weeks, 24 weeks, 36 weeks and 48 weeks.