IL-13 Blockade and Airway Autoimmunity in Asthma

Asthma, a chronic airway disease characterized by reversible airflow, airway inflammation and hyper responsiveness. A prominent phenotype is eosinophilic asthma, with a prevalence rate of ~50% and characterised by blood eosinophils >300 cells/μL and sputum eosinophils >3%. Inhaled corticosteroids (ICS) have been successful for treatment of mild-to-moderate asthma. However, ~10% of eosinophilic asthmatics remain uncontrolled despite being on high dose oral corticosteroids. This small percentage contributes disproportionately to 80% of asthma healthcare costs [8-10]. As a steroid-sparing strategy, monoclonal antibody (mAb) therapies targeting interleukin (IL)-5 signalling have been developed that are projected to benefit this difficult-to-treat population. Yet, a subset (30-50%) of them remain symptomatic despite being on oral corticosteroids (OCS) and adjunct anti-IL-5 mAb. Anti- eosinophil peroxidase (EPX) Immunoglobulin G (IgG) levels in the airways strongly correlated with the presence of other auto antibodies, in particular the anti-nuclear antibodies (ANAs) as well as various clinical features of asthma severity. Therefore, a better understanding of the underlying pathology with subsequent identification of clinical/molecular biomarkers remains an unmet clinical need for optimal asthma management. Airway autoimmune responses in severe asthma is an important contributor to airway mucus and this can be ameliorated by blocking the IL-4/IL-13 inflammatory axis.

Inclusion criteria

• Prior to the beginning of the study, patients must be willing and fully capable to provide written informed consent
• Subjects must be able and willing to comply with the study protocol
• Asthma diagnosed by a respiratory physician ≥ 36 months prior to study enrollment based on the Global Initiative for Asthma (GINA) 2014 guidelines
• Patients referred or routinely followed for asthma by Dr. Nair
• Clinical indication to prescribe dupilumab or will enter a clinical trial where patient will receive drug for at least 4 months
• ICS dose ≥ 500 mcg of fluticasone equivalent/day, and/or daily prednisone

Exclusion criteria

• Current smoker defined as having smoked at least one cigarette (or pipe, cigar, or marijuana) per day for ≥ 30 days within the three months prior to screening
• Ex-smokers with ≥ 20 pack-year smoking history
• Current pregnancy or lactation
• Treatment with anti- Immunoglobulin E (IgE), anti-IL-5, or anti-IL-5 Receptor targeted therapy currently or within three months prior to Visit 1
• Any prior medical conditions or treatment history that the physician deems unfit (including but not restricted to chronic obstructive pulmonary disease, idiopathic pulmonary fibrosis, cystic fibrosis, pulmonary arterial hypertension, tuberculosis).