Last updated on August 2016

Effect of OC459 on the Response to Rhinovirus Challenge in Asthma


Brief description of study

The aim of this study is to assess the effectiveness of a CRTH2 receptor antagonist, OC459, in preventing or attenuating the symptoms of an asthma exacerbation after rhinovirus infection. The study is a double blind, randomised trial in which half the subjects will receive OC459 and the other half placebo, before being inoculated with rhinovirus, that would normally induce a worsening of asthma symptoms i.e. an exacerbation.

Detailed Study Description

Asthma is the most common chronic respiratory disease, and in many countries prevalence is rising. The major morbidity, mortality and health care costs related to asthma are a result of periods of acutely increased symptomatology called 'exacerbations'. Most exacerbations are caused by rhinovirus, the virus associated with the common cold. There are few treatments to prevent and treat exacerbations, and despite these >50% of adult asthmatics reported having an exacerbation in the last year. There is therefore a major unmet need. Experimentally infecting asthmatics with rhinovirus, a methodology that has been safely used for >15 years, induces an asthma exacerbation in ~85%. This model offers the possibility to investigate treatment effects on asthma exacerbations with a small number of subjects, minimising the numbers exposed to a novel drug with limited safety data. In contrast, trials of therapies powered to evaluate an effect on naturally occurring exacerbations require several hundred subjects, a long study period to capture enough events, and are significantly more expensive to carry out. Using this model the investigators have shown that several inflammatory molecules, including prostaglandin D2 (PGD2), are significantly increased during rhinovirus-induced asthma exacerbations, with the levels of PGD2 strongly correlating with the severity of the symptoms. Moreover other studies have shown that when PGD2 binds the CRTH2 receptor, it stimulates the release of a number of inflammatory molecules also associated with asthma exacerbations. Blocking the CRTH2 receptor therefore appears an extremely promising target with potential to limit the virus-induced inflammation underpinning many asthma exacerbations.

Clinical Study Identifier: NCT02660489

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Hugo Farne, BMBCh MA

St Mary's Hospital
London, United Kingdom
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