Viral Infection in Asthma (VIA) Study

Rhinovirus (RV) is responsible for up to 70-80% of asthmatic exacerbations in children and adolescents requiring urgent care or hospitalizations. Understanding the mechanism by which this otherwise relatively innocuous infection produces asthma exacerbations is essential towards mitigating these episodes. Two theories have been proposed to explain this phenomenon. One is that asthmatics have defective innate and adaptive immune responses to viral respiratory infections, leading to increased viral-associated pathology with an associated enhanced inflammatory response. An alternative - and not mutually exclusive - explanation is that RV indirectly exacerbates an ongoing allergic response to bystander allergens. Dupilumab blocks type 2 inflammatory responses and is known to prevent asthma exacerbations. It both attenuates the reduced innate immunity observed in asthmatics and also reduces the ability to engage a type 2 allergic inflammatory response to bystander allergens. Therefore, the investigators hypothesize that RV mediated worsening of asthma will be attenuated in the presence of dupilumab. This study examines cellular and molecular mediators of these interactions, which could help understand the intimate mechanism(s) underlying dupilumab's protective effect in asthmatics. A total of 60 patients with mild persistent asthma will be enrolled and randomized in this study (30 active treatment and 30 placebo). The double-blind, randomized design minimizes any sources of bias. The placebo group provides a reference for the interpretation of study results, so the net effect of dupilumab could be discerned. The dupilumab dose regimen selected for this study (300 mg q2w after an initial loading dose of 600 mg) is consistent with the approved dose for patients with asthma. The primary objective of the study is to evaluate the effect of dupilumab on innate antiviral and type 2 inflammatory biomarkers, epithelial barrier repair, and adaptive immune responses following rhinovirus infection in asthmatic patients. The exploratory objectives include evaluating the effect of dupilumab in reducing the severity of rhinovirus-induced respiratory symptoms, its effect on lung function (eg FEV1, FEV1/FVC) and asthma control. As well as evaluating the effect of dupilumab on other biomarkers and viral load. The sample size was selected empirically, informed by similar successful studies conducted in the past. For example, in a previous double-blind, placebo-controlled randomized trial of omalizumab in the prevention of RV-induced asthma exacerbations, a total n of 20 (10 per group in the final analysis) was sufficient to achieve a secondary endpoint based on FEV1/FVC ratio). These data demonstrate the intrinsic power of the viral challenge model. The population included in the current trial has been further enriched (mild to moderate persistent asthmatics, on ICS ± other long-term controllers).