Impact of a Novel Immune Modulating Dietary Supplement on House Dust Mite Induced Allergic Rhinoconjunctivitis

Completed

• Conditions: Dust Mite Allergy; Allergic Rhinitis

• Registration Number: NCT04477382
• Lead Sponsor: Ecarf Institute GmbH

Brief Summary

A validated mobile Allergen exposure chamber (AEC) is used to expose qualified study participants suffering from house dust mite (HDM) induced allergic rhinoconjunctivitis. A maximum of four individuals are exposed at a time under standardized conditions with a mixture of allergens from Dermatophagoides pteronyssinus and Dermatophagoides farinae (each 50%, faeces and body allergens; doses of 250 μg/m3 air; 21°C, and 55% relative air moisture). After the first exposure, a dietary supplement lozenge, containing beta-lactoglobulin (BLG), iron, retinoic acid, zinc and polyphenols, is taken twice daily for a period of 12 weeks, followed by the second exposure. A minimum of thirty persons are challenged with HDM allergen. After entering the chamber there is an acclimatization phase of 20 minutes with no exposure. Exposure time starts after acclimatization in the chamber and is 120 minutes at each visit. Objective parameters are recorded every 30 minutes, and subjective parameters are recorded every 10 minutes over a period of 120 minutes. During the exposure a plateau (steady-state) of total nasal symptom score with a difference from baseline is measured in all participants for each of the two exposures with HDM.

Detailed Description

Not available

Study Timeline

• Study Start: 2020-01-06
• Primary Completion: 2020-06-30
• Study Completion: 2020-06-30
• Study First Submitted: 2020-07-08
• Study First Submitted QC: 2020-07-15
• Study First Posted: 2020-07-20
• Status Verified: 2021-03
• Last Update Submitted: 2021-04-23
• Last Update Posted: 2021-04-26

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 38

Inclusion Criteria

• Allergy to house dust mite (HDM) with rhinoconjunctivitis symptoms with/without asthma. These allergic symptoms must have been present for at least 2 years and severity assessed by anamnesis according to ARIA guidelines (mild; moderate/severe - Bousquet et al, 2007)
• Positive skin test to HDM extract using a skin testing diagnostic product used in the daily routines of the clinics, with a wheal diameter > 3 mm
• Positive nasal provocation test to HDM allergen as used in the chamber and/or a history of TNSS ≥ 3 after 120 min HDM exposure in the chamber
• Oral and written informed consent

Exclusion Criteria

• Current or previous treatment with allergy vaccination within the last two years.

• Concomitant (or newly developing during study period) severe disease interfering with allergy testing

• Co-medication interfering with allergy testing for other diseases, e.g. immunosuppressants, oral and/or nasal corticosteroids, chromones and pregnancy

• Clinically relevant co-sensitization to early blossoming tree pollen allergens, and cat allergens

• Patient with FEV1 < 80% of predicted value prior to exposure

• Patients with severe asthma and / or with a history of uncontrolled asthmatic attacks in the last three months before the selection process

• Patients with an upper intestinal tract disease, where the local examiner believes that taking the dietary supplement could pose a risk to the patient

• History of serious chronic medical conditions and/or any disease where, in the opinion of the site investigator, participation in the trial would pose a risk for the patient

• Treatment prior to study visits and during the whole study time with:

  • systemic corticosteroids within three weeks (21 days)
  • topical nasal corticosteroids within two weeks (14 days)
  • chromones within 7 days
  • antihistamines within 72 hours before visit 1
  • antibiotics within 3 months before visit 1 and during the whole study
  • anti-allergic drugs during the whole study time.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
TNSS	After 120 minutes of allergen challenge	Total Nasal Symptom Score (TNSS) in response to HDM exposure in an AEC at V1 (baseline AEC exposure) versus V3 (final AEC exposure). The TNSS is the sum of 4 nose symptoms (runny nose, sneezing, itchy nose, and blocked nose) on a scale of 0 to 3 (no symptoms, mild symptoms, moderate symptoms, and severe symptoms), leading to a maximum TNSS of 12.

Secondary Outcome Measures

Name	Time	Method
PEF	Recorded at time zero (0) and every 30 minutes during exposure until 120 minutes. An acclimatization phase of 20 minutes takes place in the chamber - so time point zero is when exposure starts after 20 minutes of acclimatization	PEF (peak expiratory flow) liter/minute.
TSS	Up to 120 minutes following allergen challenge	Total Symptom Score in response to HDM exposure in an AEC at V1 (baseline AEC exposure) versus V3 (final AEC exposure). The TSS is the sum of 4 nose symptoms (runny nose, sneezing, itchy nose, and blocked nose), 3 eye symptoms (itchy eyes, watery eyes, and gritty feeling), 4 bronchial symptoms (wheezing, cough, breathlessness, and asthma), and 2 other symptoms (itchy palate, and itchy skin) on a scale of 0 to 3 (no symptoms, mild symptoms, moderate symptoms, and severe symptoms), leading to a maximum TSS of 39.
VAS	Recorded at time zero (0) and every 30 minutes during exposure until 120 minutes	Visual Analogue Scale: Before, every 30 minutes during and after the exposure patients grade the question on their well-being by putting a vertical line on a 10 cm line representing severity from 0 cm "very good" to 10 cm "very bad".
PNIF	Recorded at time zero (0), and every 30 minutes during exposure until 120 minutes. An acclimatization phase of 20 minutes takes place in the chamber - so time point zero is when exposure starts after 20 minutes of acclimatization	PNIF (peak nasal inspiration flow) liter/minute.
TBSS	Up to 120 minutes following allergen challenge	The Total Bronchial Symptom Score (TBSS) is the sum of 4 bronchial symptoms (wheezing, cough, breathlessness, and asthma) on a scale of 0 to 3 (no symptoms, mild symptoms, moderate symptoms, and severe symptoms), leading to a maximum TBSS of 12.
TESS	Up to 120 minutes following allergen challenge	The Total Eye Symptom Score (TESS) is the sum of 3 eye symptoms (itchy eyes, watery eyes, and gritty feeling) on a scale of 0 to 3 (no symptoms, mild symptoms, moderate symptoms, and severe symptoms), leading to a maximum TESS of 9.
Need for rescue medication and/or emergency treatment	up to 24 hours after AEC exposure	Need for rescue medication and/or emergency treatment.
FEV1	Up to 120 minutes following allergen challenge	Forced expiratory volume in 1 second, before and after the exposure.
FEV1/FVC	Up to 120 minutes following allergen challenge	Forced expiratory volume in 1 second/forced vital capacity ratio, before and after the exposure.
Adverse events with regards to the allergen exposure	up to 24 hours after AEC exposure	Number of events and number of patients recording late-phase reactions and/or adverse events with regards to the allergen exposure.
Adverse events with regard to the taken dietary supplement	up to 24 hours after the final AEC exposure	Number of events and number of patients recording adverse events with regard to the taken dietary supplement. After completing the baseline AEC exposure at V1 the patients will enter the 3-month consumption period with the dietary supplement. Every patient will document potential AEs in the patient report form. In addition, the patient will be called every 4 weeks during the consumption period to follow up on potential AEs with the intake. The final safety phone call will be made 24 hours after the final AEC exposure.

Trial Locations

Locations (1)

ECARF Institute GmbH; 🇩🇪 Berlin, Germany