Studies nose bacteria and immune response before and after mepolizumab in eGPA
Studies nasal bacteria and immune cells in adults with eGPA before and after mepolizumab.
Plain-language title generated from the registry record
Registry title: eGPA and Local Inflammation Within the Ear, Nose and Throat Area
Key facts
- Where
- Groningen, NetherlandsSee the site
AI summary: who the study is looking for
From the trial's eligibility criteria. Machine-read from the registry text on this page, so it can be wrong. The registry text below and the trial team decide who can take part.
The trial is looking for adults with eGPA, GPA, severe asthma or nasal polyps, and healthy adults as a comparison group. It studies the nose bacteria and immune response, and the effect of mepolizumab.
- Age
- 18 years or older
- Sex
- All sexes can join.
- Disease stage
- Depends on the group: eGPA or GPA meeting the ACR/EULAR criteria; chronic rhinosinusitis with nasal polyps on both sides; severe asthma with FEV1 <80%; or healthy controls with no asthma symptoms.
- Earlier treatment
- Cannot have used dupilumab within 6 months before the baseline visit. Healthy controls cannot have used antibiotics in the last month, immunosuppressive medicine, or long-term local anti-inflammatory agents.
- Biomarker or test result
- Severe asthma group: FEV1 reversibility >12% at first test or a positive methacholine challenge (PC20 < 8 mg/ml).
Main reasons for not taking part
- Cannot give informed consent
- Active smoking less than 6 months before the baseline visit
- Dupilumab use within 6 months of the baseline visit
- Pregnant or breastfeeding women
- Nasal polyp group: current use of asthma medicine or eGPA
Read by machine on 12 November 2026.
Where in Netherlands
- UMC GroningenGroningen, NetherlandsContact: Abraham Rutgers, MD-PhDTaking people
Questions to ask the study team
- How often do I need to come in, and for how long each time?
- Are travel costs paid?
- Can I keep my own doctor?
- What happens if I want to stop?
Contact the study team: see the registry record → Contacts and Locations
Print a page for my doctorTrial details
- Who runs it
- University Medical Center Groningen
- Trial code
- NCT06298448
- Record updated
- 7 March 2024
- Original description
Rationale: Eosinophilic Granulomatosis with Polyangiitis (eGPA), eosinophilic asthma and chronic rhinosinusitis with nasal polyps (CRSwNP) are airway diseases where eosinophils and interleukine-5 are involved in the pathogenesis. eGPA differs from the other diseases with respect to involvement of other organs. The investigators hypothesize that nasal microbiome dysbiosis with a central augmenting role for S. Aureus plays an important role in disease expression. The investigators expect that anti-interleukin-5 treatment with mepolizumab restores the changes of the nasal microbiome and immune responses to a healthy control phenotype. To study this, the nasal microbiome, the local and systemic immune response and the effect of mepolizumab treatment will be assessed.Read full original descriptionShow less
Impact of Mepolizumab Treatment on the Nasal Microbiome and Local and Systemic Immune Response in Eosinophilic Granulomatosis With Polyangitis (eGPA)
Rationale: Eosinophilic Granulomatosis with Polyangiitis (eGPA), eosinophilic asthma and chronic rhinosinusitis with nasal polyps (CRSwNP) are airway diseases where eosinophils and interleukine-5 are involved in the pathogenesis. eGPA differs from the other diseases with respect to involvement of other organs. The investigators hypothesize that nasal microbiome dysbiosis with a central augmenting role for S. Aureus plays an important role in disease expression. The investigators expect that anti-interleukin-5 treatment with mepolizumab restores the changes of the nasal microbiome and immune responses to a healthy control phenotype. To study this, the nasal microbiome, the local and systemic immune response and the effect of mepolizumab treatment will be assessed.
Inclusion: 18 years of age; able to give informed consent; In CRSwNP group: availability of bilateral nasal polyps as diagnosed by endoscopy or CT scan; In Severe asthma group: clinical diagnosis of asthma with forced expiratory volume at one second(FEV1) <80% AND either FEV1 reversibility >12% initial or documented positive metacholine challenge (PC20 < 8 mg/ml); In eGPA group: Fulfilling the 2022 ACR/EULAR criteria for eGPA (Wechsler et al., 2017); In GPA group: fulfilling the American College of Rheumatology (ACR)/EULAR GPA criteria (Robson et al., 2022); In healthy controls: absence of asthma symptoms, no bronchial hyperresponsiveness.
Exclusion: Concomitant use of dupilumab within 6 months of baseline visit; in CRSwNP group: current use of asthma medication, eGPA; in healthy controls: use of immunosuppressive medication; unable to give informed consent; Active smoking < (less than) 6 months from baseline visit; pregnant or breastfeeding woman; in healthy controls: chronic use of local anti-inflammatory agents; in healthy controls: use of antibiotics within the last month (before start study/screening/).