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Safety and Efficacy Study of Oral Senicapoc on Allergen Challenge in Atopic Asthmatic Subjects

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ClinicalTrials.gov Identifier: NCT00861211
Recruitment Status : Completed
First Posted : March 13, 2009
Last Update Posted : July 14, 2011
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Brief Summary:
The purpose of the study is to determine whether senicapoc can decrease changes in FEV1 following allergen challenge in atopic allergic subjects.

Condition or disease Intervention/treatment Phase
Atopic Asthma Drug: senicapoc Drug: Placebo Phase 2

Detailed Description:
Based on the unmet medical need for new agents in the treatment of asthma and the role of KCa3.1 in the function of several different cell types involved in the inflammatory response, and the effects seen in an animal model of allergic asthma, it is reasonable to explore the utility of senicapoc, a KCa3.1 blocker, as a novel treatment of asthma. This study will test the ability of senicapoc to alleviate bronchospasm induced by an allergen challenge in patients with allergic asthma. It is analogous to the study performed in animals in which senicapoc demonstrated the ability to reduce airway resistance and hyper-responsiveness induced by airway challenge with antigen and carbachol, respectively. This study is also the first to test the ability of senicapoc to reduce airway inflammation, which is the key pathophysiologic process in asthma. In summary, with a demonstrated safety profile across a wide range of doses in humans and efficacy in an animal model of allergic bronchospasm and hyper-responsiveness, the initiation of exploratory studies of senicapoc for treatment of asthma is justified.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 34 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Phase 2, Randomized, Double-Blind, Placebo-Controlled, Parallel-Group, Multicenter Study to Assess The Safety and Efficacy of Two Weeks of Oral Senicapoc Administration on Allergen Challenge in Atopic Asthmatic Subjects
Study Start Date : October 2008
Actual Primary Completion Date : March 2009
Actual Study Completion Date : May 2009

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Asthma

Arm Intervention/treatment
Experimental: Active treatment arm Drug: senicapoc
Loading Dose: 80 mg twice daily x 3 days followed by Maintenance Dose: 40 mg daily x 11 days
Other Name: ICA-17043

Placebo Comparator: Placebo Drug: Placebo
Placebo comparator

Primary Outcome Measures :
  1. Decrease in FEV1 between 4-10 hours (Late Asthmatic Response) after allergen challenge and will compare the active (40 mg QD) vs. placebo treatment groups with respect to change in response to allergen challenge. [ Time Frame: after 2 weeks of treatment with study medication ]

Secondary Outcome Measures :
  1. Early allergen response to allergen challenge, measure of airway hyperreactivity to methacholine challenge, pulmonary function tests (FEV1 and FVC), fraction of exhaled NO, cell differentials and cytokine measurements from induced sputum samples. [ Time Frame: after 2 weeks of study medication ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • History of asthma (as defined by the Global Initiative in Asthma definition or having been previously treated for asthma);
  • Baseline (pre-bronchodilator) forced expiratory volume at one second (FEV1) ≥70% of predicted;
  • Clinically acceptable medical history, physical examination, 12 lead ECG, vital signs, and clinical laboratory tests );
  • Positive response on screening to skin prick test to either house dust mite, cat hair, or grass pollen;
  • A positive inhaled methacholine challenge with a PC20 ≤ 8 mg/mL (within 6 months prior to Screening Visit 1);
  • Screening allergen challenge demonstrates that the subject experiences both an early and late asthmatic response. The early asthmatic response must include a fall in FEV1 of equal to or more than 20% from the post saline value, on at least one occasion, between 5 and 30 minutes after the final concentration of allergen. The late asthmatic response must include a fall in FEV1 of equal to or more than 15% from the post saline value, on at least three occasions, two of which must be consecutive, between 4 and 10 hours after the final concentration of allergen;
  • Non-smoker (refrained from any tobacco usage or any products containing nicotine for 6 months prior to Screening Visit 1);
  • Able and willing to give written informed consent to participate in the study.

Exclusion Criteria:

  • Any subject who has experienced any allergic reaction to a drug that suggests an increased potential for a hypersensitivity to senicapoc (e.g. clotrimazole);
  • Previous ingestion of senicapoc (ICA-17043) prior to Screening Visit 1;
  • Any condition that might interfere with the absorption, distribution, metabolism, and/or excretion of drugs;
  • Respiratory tract infection or asthma exacerbation within 4 weeks of the first Screening Visit or within the period between Screening Visit 1 and Day 1 unless study physician believes lung function was unaffected (no greater than 10% decrease in baseline FEV1) by such event;
  • Considering or scheduled to undergo any surgical procedure during the duration of the study;
  • History of alcohol and/or drug abuse within 2 years prior to Screening Visit 1;
  • Donation of blood (>450 mL) or significant loss of blood within 56 days prior to Screening Visit 1;
  • Received any commercially licensed investigational product within 30 days prior to Screening Visit 1 or received any unlicensed investigational product within 90 days prior to Screening Visit 1;
  • History of chronic hepatitis B or C, a positive test for hepatitis B surface antigen, hepatitis C antibody, a history of HIV infection, or demonstration of HIV antibodies;
  • A positive qualitative urine drug test, a positive urine or breath alcohol test, or a positive urine cotinine or CO breath test at the first Screening visit or on Day 1;
  • Use of oral or inhaled or intranasal corticosteroid, long acting beta agonists (e.g., salmeterol or formoterol), leukotriene receptor antagonists (e.g., zafirlukast or montelukast), theophylline, nedocromil sodium, cromolyn sodium, zileuton , or anti-cholinergic agents within the 28 days prior to the first Screening visit;
  • Use of oral antihistamines within 1 week prior to the first Screening visit;
  • Symptomatic with hay fever during any of the Screening Visits or Day 1;
  • A >10 pack year cigarette history.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00861211

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United Kingdom
Guy's Drug Research Unit
London, UK, United Kingdom, SE1 1YR
Medicines Evaluation Unit
Manchester, UK, United Kingdom, M23 9QZ
Sponsors and Collaborators
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Principal Investigator: Tak H Lee, FRCP Guy's Drug Research Unit, Quintiles Limited
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Responsible Party: Seth V. Hetherington, M.D. Sr. VP Clinical and Regulatory Affairs, Icagen, Inc.
ClinicalTrials.gov Identifier: NCT00861211    
Other Study ID Numbers: ICA-17043-17
First Posted: March 13, 2009    Key Record Dates
Last Update Posted: July 14, 2011
Last Verified: July 2011
Keywords provided by Icagen:
allergen challenge
Additional relevant MeSH terms:
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Bronchial Diseases
Respiratory Tract Diseases
Lung Diseases, Obstructive
Lung Diseases
Respiratory Hypersensitivity
Hypersensitivity, Immediate
Immune System Diseases