Prospective Registry of Eosinophilia With Respiratory Manifestations With Translational Research Identifying and Characterizing Eosinophils

NCT ID: NCT04538937

Last Updated: 2020-09-04

Basic Information

• Recruitment Status: RECRUITING
• Total Enrollment: 300 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2020-02-26
• Study Completion Date: 2030-02-26

Brief Summary

Introduction: The etiology and therapy of eosinophilic lung diseases are still poorly understood. For individual forms of disease, such as eosinophilic asthma or eosinophilic granulomatosis with polyangiitis (EGPA), new therapeutic approaches exist that block the interleukin IL-5 or the IL-5 receptor. Eosinophilic manifestations of the respiratory tract can exclusively affect the lungs or occur as part of a systemic disease. The manifestations partially overlap and are clinically difficult to differentiate (e.g. eosinophilic asthma, Samter Triad, EGPA or hypereosinophilic syndrome (HES)). It is now known that blood eosinophil counts correlate with the level of eosinophils recruited to the airways. However, it is still unclear whether there is a blood eosinophilia without clinical relevance or whether there is a risk of organ damage (e.g. in HES). Hence, different subtypes of eosinophils with different polarization are discussed.

Aim of the study: A registry of patients with eosinophilia and respiratory manifestation will be established at the University Hospital of Innsbruck. The course of disease will be evaluated prospectively in a non-interventional study. This study stands on three main clinical pillars with focus on further characterization of eosinophilic cells:

1. Patients will be included who switch from a previous application of the anti-IL5 antibody mepolizumab (production and administration of the injection from lyophysate through the doctor) to the pre-mixed pen (self-injection at home).

2. Furthermore, special focus is set on patients suffering from the so-called Samter Triad. In these patients, the control of asthma, nasal polyps and NSAID intolerance will be examined in an interdisciplinary fashion during the course of treatment.

3. Previous clinical studies at our Department indicate that some patients with severe eosinophilic asthma or Samter Triad could represent a mono-organic or limited manifestation of lymphoid HES. This hypothesis is tested by measuring additional chemokines, somatic mutations and FACS parameters in this subgroup to verify a clonal disease.

In addition, translational research will differentiate resident and inflammatory eosinophilic granulocytes by FACS analysis and further characterize them by fluorescence microscopy, electron microscopy, gene chip analysis and lipidomics, in the above-mentioned diseases and in healthy controls, respectively.

Patients and methods: All patients suffering from eosinophilia with pulmonary involvement who are diagnosed with eosinophilic asthma, EGPA, Samter Triad, HES, and eosinophilic pneumonia with signed consent are included in the prospective registry. Provided, that they are registered at the outpatient department of pneumology, ENT, haematology or allergology at the University Hospital Innsbruck. The investigators will collect laboratory analyses, lung function, imaging, bone marrow biopsies, ENT findings and allergological findings over the course of the study. Furthermore, additional blood tubes are collected during routine blood tests, which are used to identify and characterize subtypes of eosinophilic granulocytes.

Risks for patients: No additional examinations, blood sampling or invasive measures are required for the patient. Thus, there is no additional risk for study participants.

Risks for control subjects: In order to be able to compare our results with the healthy population, volunteer subjects are recruited. After consent has been given, a blood sample is taken. Despite the low risk, it is theoretically possible that blood sampling may be accompanied by non-severe complications (such as hematoma, infection).

Benefits: The investigators expect new insights into phenotype and therapy of patients with eosinophilic manifestations of the respiratory tract.

Conditions

Eosinophilic Asthma; EGPA - Eosinophilic Granulomatosis With Polyangiitis; Samter Triad; HES - Hypereosinophilic Syndrome; Eosinophilic Pneumonia

Study Design

• Observational Model Type: OTHER
• Study Time Perspective: PROSPECTIVE

Study Groups

Subjects with eosinophilia and respiratory manifestation

no intervention

Intervention Type: OTHER

no intervention

Healthy subjects

no intervention

Intervention Type: OTHER

no intervention

Interventions

no intervention

no intervention

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• age ≥ 18 years
• documented blood eosinophilia ≥ 300 cells/µl
• present tissue damage of the respiratory tract caused by eosinophils

Exclusion Criteria

• age < 18 years
• pregnancy
• dementia
• incapacitated patients

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Medical University Innsbruck

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Locations

University Clinic for Internal Medicine II

Innsbruck, , Austria

Site Status: RECRUITING

Countries

Austria

Central Contacts

Ivan Tancevski, MD

Role: CONTACT

ivan.tancevski@i-med.ac.at

+43 50504 81602

Judith Löffler-Ragg

Role: CONTACT

judith.loeffler@i-med.ac.at

+43 50504 81413

Facility Contacts

Ivan Tancevski, MD

Role: primary

ivan.tancevski@i-med.ac.at

+43 50504 81602

Other Identifiers

20200303-2218

Identifier Type: -

Identifier Source: org_study_id