- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04641130
Clinical Validation Study in Allergic Conjunctivitis to Birch Pollen During Allergen Challenge in ALYATEC EEC
Validation and Reproducibility Study of the ALYATEC Allergen Exposure Chamber by Determining the Concentration of Birch Pollen Allergen Inducing Conjunctivitis in Subjects Allergic to Birch Pollen.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Locations
-
-
Grand Est
-
Strasbourg, Grand Est, France, 67000
- ALYATEC
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Subjects having signed the informed consent
- Subjects affiliated to a social security scheme
- Subjects with birch pollen rhinitis and conjunctivitis with:
- A history of rhinoconjunctivitis for at least the last 2 consecutive pollen seasons.
- A positive skin prick-test to birch (wheal diameter >6 mm compared to the negative control),
- Specific immunoglobulin E (IgE) for birch> 0.1 kIU/l
- Women of childbearing potential must have a negative pregnancy test during the entire study period with an effective means of contraception: oral contraceptives, intrauterine device, condom with spermicide for at least one month before inclusion in the study and for the duration of the study. At each study visit and each exposure on D1, a urine pregnancy test will be performed.
- A positive conjunctival provocation test to birch during the screening visit at a dilution of 100IR/ml maximum
Exclusion Criteria:
- Known asthmatic subjects allergic to birch pollen
- Use of oral corticosteroids in the 4 weeks preceding inclusion in the study
- Use of biotherapy in the 4 months preceding inclusion in the study
- Desensitization to birch pollen in the last 5 years
- Uncontrolled chronic pathologies (hypertension, cardiac, respiratory, renal pathology).
- Active autoimmune disease
- Uncontrolled systemic hypertension
- Subjects who participated in another clinical study in the three months prior to inclusion
- Pregnancy and breast feeding
- Inability to understand and act upon the information provided
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Other
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Exposure to birch pollen
Step 1: dose validation 16 subjects are exposed for 2 consecutive days (D1 + D2), to the same aerial concentration of Bet v1. The main objective is achieved if the Abelson score is ≥ 5 on J1 or J2. If the main objective is achieved for the 60 ng/m3 concentration, 8 responder subjects will directly perform step 2. If the main objective is not achieved for the 60 ng/m3 concentration, the subjects will be exposed between 7 to 10 days after exposure 1, to an allergen concentration of 120 ng/m3 (Exposure 2: D1 + D2). Step 2: reproducibility Once the allergen concentration has been determined (step 1), 8 of the responder subjects from step 1 are exposed again to this same concentration, during 2 additional exposures (Exposure 3: D1 + D2 and Exposure 4: D1 + D2), at least 7 days apart. A wash-out period of at least 7 days is observed between step 1 and 2. The duration of allergen exposure will be a maximum of 4 hours for all exposures. |
Patients are exposed to airborne birch pollen allergen.
The duration of each exposure is 4h maximum.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Determine the concentration of birch pollen allergen (in ng/m3 of Bet v1) necessary to induce a conjunctival response in at least 50% of subjects allergic to birch.
Time Frame: 4 hours exposure in EEC
|
A positive conjunctival response is defined by an Abelson score ≥ 5.
|
4 hours exposure in EEC
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Evaluate the reproducibility of allergen exposure in the ALYATEC EEC
Time Frame: 4 hours exposure in EEC
|
The reproducibility of the exposure will be assessed by measuring the quantity of birch pollen allergen (ng Bet v1) inducing a conjunctival response during step 2.
|
4 hours exposure in EEC
|
Study the effect of EEC birch pollen exposure on symptoms of rhino-conjunctivitis.
Time Frame: 4 hours exposure in EEC
|
The effect of the exposure on the rhinoconjunctival response will be assessed by Rhinoconjunctivitis Total Symptom Score (RTSS). The RTSS is the sum of 6 rhinoconjunctivitis symptom scores: sneezing, rhinorrhea, nasal pruritus, nasal congestion, ocular pruritus and watery eyes. Each symptom is graded in a 4-point scale as follows: 0: no symptoms, 1: mild symptoms, 2: moderate symptoms, 3: severe symptoms. It ranges from 0 to 18. The lower the score, the better the outcome. |
4 hours exposure in EEC
|
Study the effect of EEC birch pollen exposure on symptoms of rhinitis
Time Frame: 4 hours exposure in EEC
|
The effect of the exposure on the rhinitis response will be assessed by rhinitis Visual Analogue Scale (VAS). The rhinitis VAS is a measurement of patient's subjective evaluation of symptoms severity. Patients will score the severity of their nasal symptoms on a scale, with 0 meaning no symptoms and 10 meaning the worst symptoms. |
4 hours exposure in EEC
|
Study the effect of EEC birch pollen exposure on symptoms of conjunctivitis.
Time Frame: 4 hours exposure in EEC
|
The effect of the exposure on the conjunctival response will be assessed by Conjunctivitis Visual Analogue Scale (VAS). The conjunctivitis VAS is a measurement of patient's subjective evaluation of symptoms severity. Patients will score the severity of their ocular symptoms on a scale, with 0 meaning no symptoms and 10 meaning the worst symptoms. |
4 hours exposure in EEC
|
Measure the amount of particles carrying the allergens.
Time Frame: 4 hours exposure in EEC
|
The amount of particles carrying the allergen will be measured with counters located in the exposure chamber.
|
4 hours exposure in EEC
|
Measure the aerodynamic diameter of the particles carrying the allergens.
Time Frame: 4 hours exposure in EEC
|
The aerodynamic diameter of the particles carrying the allergen will be measured with counters located in the exposure chamber.
|
4 hours exposure in EEC
|
Evaluate changes in mitochondrial respiration
Time Frame: 4 hours exposure in EEC
|
The changes in mitochondrial respiration will be done by evaluating the modifications of the I to IV complex of the mitochondrial respiratory chain, before and after allergen exposure
|
4 hours exposure in EEC
|
Collaborators and Investigators
Sponsor
Publications and helpful links
Helpful Links
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- ALY-002B
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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