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Lancet Respir Med. 2018 Jul;6(7):499-510. doi: 10.1016/S2213-2600(18)30201-7. Epub 2018 May 21.

Effect of tralokinumab, an interleukin-13 neutralising monoclonal antibody, on eosinophilic airway inflammation in uncontrolled moderate-to-severe asthma (MESOS): a multicentre, double-blind, randomised, placebo-controlled phase 2 trial.

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Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK.
Institute for Heart and Lung Health, University of British Columbia, Vancouver, BC, Canada.
Department of Respiratory Medicine, Bispebjerg Hospital, Copenhagen University, Copenhagen, Denmark.
Respiratory Division, Department of Medicine, McGill University Health Centre, Montreal, QC, Canada.
Department of Respiratory Medicine, Odense University Hospital, Odense, Denmark.
Department of Respiratory Medicine, Hvidovre University Hospital, Hvidovre, Denmark.
NIHR Respiratory Biomedical Research Centre, University of Nottingham, Nottingham, UK.
Medicines Evaluation Unit, University of Manchester, Manchester University NHS Foundation Trust, Manchester, UK.
Respiratory Medicine Department, Gartnavel General Hospital, Glasgow, UK; Institute of Infection, Immunity and Inflammation, University of Glasgow, Glasgow, UK.
Respiratory Clinical Trials, Queen Anne Street Medical Centre, London, UK.
Centre for Experimental Medicine, Queen's University Belfast, Belfast, UK.
Respiratory Global Medicines Development, AstraZeneca, Cambridge, UK.
Respiratory Global Medicines Development, AstraZeneca, Gothenburg, Sweden.
Respiratory Global Medicines Development, AstraZeneca, Gaithersburg, MD, USA.
Respiratory Global Medicines Development, AstraZeneca, Mississauga, ON, Canada.
Department of Infection, Immunity and Inflammation, University of Leicester, Leicester, UK. Electronic address:



The role of interleukin 13 in airway inflammation and remodelling in asthma is unclear. Tralokinumab is a human monoclonal antibody that neutralises interleukin 13. We aimed to evaluate whether tralokinumab would have an effect on airway eosinophilic infiltration, blood and sputum eosinophil concentrations, eosinophil activation, and airway remodelling.


We did a multicentre, double-blind, randomised, placebo-controlled phase 2 trial at 15 centres across the UK, Denmark, and Canada. We enrolled participants of either sex aged 18-75 years with inadequately controlled moderate-to-severe asthma for 12 months or more, requiring treatment with inhaled corticosteroids at a stable dose. We randomly assigned participants (1:1) to receive tralokinumab (300 mg) or placebo by an interactive web-based system or voice response system. Participants and study personnel were masked to treatment allocation. Both tralokinumab and placebo were administered subcutaneously every 2 weeks. The primary outcome measure was change from baseline to week 12 in bronchial biopsy eosinophil count. Secondary outcome measures included change in blood and sputum eosinophil counts. Exploratory outcomes included fractional exhaled nitric oxide (FENO) and blood IgE concentrations. Safety analyses were carried out in all participants who received study drug. This trial is registered with, number NCT02449473, and with the European Clinical Trials Database, EudraCT 2015-000857-19.


Between Sept 25, 2015, and June 21, 2017, 224 participants were enrolled and screened. Of these participants, 79 were randomly assigned to receive tralokinumab (n=39) or placebo (n=40). Tralokinumab did not significantly affect bronchial eosinophil count compared with placebo at week 12 (treatment effect ratio 1·43, 95% CI 0·63-3·27; p=0·39). Compared with placebo, tralokinumab did not significantly affect blood eosinophil count (treatment effect ratio 1·21, 95% CI 1·00-1·48; p=0·055) or sputum eosinophil count (0·57, 0·06-6·00; p=0·63), but FENO concentration (0·78, 0·63-0·96; p=0·023) and total blood IgE concentration (0·86, 0·77-0·97; p=0·014) were significantly reduced. 33 (85%) of 39 patients receiving tralokinumab and 32 (80%) of 40 receiving placebo reported at least one adverse event during the treatment period. No deaths in either treatment group were observed. Treatment-related adverse events occurred more frequently in the tralokinumab group than in the placebo group (11 [28%] of 39 vs seven [18%] of 40).


Tralokinumab did not significantly affect eosinophilic inflammation in bronchial submucosa, blood, or sputum compared with placebo, but did reduce FENO and IgE concentrations. These results suggest interleukin 13 is not crucial for eosinophilic airway inflammation control in moderate-to-severe asthma.



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