Effect of the CRTH2 Antagonist OC459 on the Response to Rhinovirus Challenge in Asthma
试验速览
- 阶段
- 2 期
- 状态
- 已完成
- 入组人数
- 44
- 试验地点
- 1
- 主要终点
- Total Lower Respiratory Symptom Score
研究概览
简要总结
The aim of this study is to assess the effectiveness of a CRTH2 receptor antagonist, OC459, in preventing or attenuating the worsening of asthma symptoms during 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.
详细描述
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 inoculating patients with asthma with rhinovirus, a methodology that has been safely used for >15 years, induces an infection and worsening symptoms 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.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
入排标准
- 年龄范围
- 18 Years 至 55 Years（Adult）
- 性别
- All
- 接受健康志愿者
- 否
入选标准
- •Age 18--55 years
- •Male or female
- •Clinical diagnosis of asthma for at least 6 months prior to screening
- •An Asthma Control Questionnaire (ACQ) Score >0.75
- •Positive histamine challenge test (PC20 <8 µg/ml, or <12 µg/ml and bronchodilator response ≥ 12%)
- •Worsening asthma symptoms with infection since last change in asthma therapy
- •Positive skin prick test to common aeroallergens (e.g. animal epithelia, dust mite)
- •Treatment comprising inhaled corticosteroids (ICS) or combination inhaler (Long -Acting Beta Agonist with ICS), with a daily ICS dose of at least 100mcg fluticasone or equivalent.
- •Participant is willing for their GP to be informed of their participation.
- •English speaker
排除标准
- •Presence of clinically significant diseases other than asthma, which, in the opinion of the investigator, may either put the patient at risk because of participation in the trial, or diseases which may influence the results of the study or the patient's ability to take part in it
- •Smoking history over past 12 months
- •Seasonal allergic rhinitis symptoms at screening
- •Asthma exacerbation or viral illness within the previous 6 weeks
- •Current or concomitant use of oral steroids, anti--leukotrienes or monoclonal antibodies
- •Pregnant or breast-feeding women (patients should not be enrolled if they plan to become pregnant during the time of study participation)
- •Contact with infants <6 months or immunocompromised persons, elderly and infirm at home or at work
- •Subjects who have known evidence of lack of adherence to medications and/or ability to follow physician's recommendations
研究组 & 干预措施
OC459 (CRTH2 antagonist)
OC459 50mg once daily for 5 weeks
干预措施: OC459 (Drug)
OC459 (CRTH2 antagonist)
OC459 50mg once daily for 5 weeks
干预措施: Rhinovirus (Other)
Placebo
Placebo tablet once daily for 5 weeks
干预措施: Placebo (Drug)
Placebo
Placebo tablet once daily for 5 weeks
干预措施: Rhinovirus (Other)
结局指标
主要结局
Total Lower Respiratory Symptom Score
时间窗: During 14 days following rhinovirus inoculation
Sum of daily scores for 14 days. Seven symptoms (cough on waking, wheeze on waking, daytime cough, daytime wheeze, daytime chest tightness, daytime breathlessness, nocturnal cough/wheeze/breathlessness) ranked from 0 (none) to 3 (severe). Range 0 to 294; higher is more symptomatic.
次要结局
- Change in Asthma Control Questionnaire (ACQ)-6 Score(Baseline, 10 days post rhinovirus inoculation)
- Percentage Change in Peak Expiratory Flow Rate(Baseline and up to 14 days post rhinovirus inoculation)
- Change in Forced Expiratory Volume in 1 Second (FEV1)(Baseline and up to 14 days post rhinovirus inoculation)
- Change in Exhaled Nitric Oxide (FeNO)(Baseline and up to 10 days post rhinovirus inoculation)
- Changes in Airway Hyper Responsiveness (Histamine)(Baseline and 7 days post rhinovirus inoculation)
- Viral Load (in Nasal Lavage Samples)(Up to 14 days post rhinovirus inoculation)
- Total Upper Respiratory Symptom Score(During 14 days following rhinovirus inoculation)