Extrinsic and Intrinsic Factors in Atopic Dermatitis Upon Systemic Immune Modulation

Study Overview
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Brief Summary
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Currently, patients with moderate to severe atopic dermatitis are treated with dupilumab if unresponsive to topical treatment. However, not all patients who suffer from atopic dermatitis respond similarly to this treatment. Pattern recognition of immune cells (PRI) is an efficient method to screen patients to allow a more personalized therapy. The main aim of this scientific explorative study is to unravel the changes in peripheral blood immune cell compositions in patients with atopic eczema undergoing dupilumab treatment. This allows the identification of phenotypes of treatment responders and non-responders and possible approaches of treatment modifications for non-responders.

Detailed Description
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A better understanding of the pathology of atopic dermatitis could lead to the development of new therapeutic strategies for this disease and contribute to better and more targeted disease management - an advantage for all patients with atopic dermatitis. The PRI is a new bioinformatic analysis strategy that allows in-depth data analysis from flow cytometry with multiple variables. This facilitates the identification of meaningful T cell subpopulations, which are differentially abundant between two groups to predict responders and non-responders prior to dupilumab treatment. Peripheral blood will be collected before, 4 weeks, 8 weeks, and 16 weeks after initiating the systemic treatment with dupilumab to identify recognition patterns/markers on the T cells. Therefore, a predefined multicolor flow cytometry panel was developed to analyse lineage, differentiation and activation markers. Patients will receive a systemic therapy (dupilumab 600 mg loading dose, followed by 300 mg in two weeks intervals). Follow up visits will be performed every 3 months starting from the second visit (2nd visit will take place 4 weeks after initiating Dupilumab treatment). The blood samples that are taken as part of this scientific study are pseudonymized in the research laboratories and stored for a period of 5 years after the end of this study or the publication of the results and destroyed.

Official Title
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Pattern Recognition of Immune Cells in Atopic Dermatitis Patients Receiving Dupilumab

Conditions
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Atopic Dermatitis

Intervention / Treatment
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* Other: not applicable, observational study


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age 18 and above Diagnosis of atopic dermatitis for ≥1 year Inadequate response to treatment with topical medications Confirmed dupilumab treatment Exclusion Criteria: Age below 18 Known or suspected allergy or reaction to any component of the dupilumab formulation Known active allergic or irritant contact dermatitis that is likely to interfere with the assessment of the severity of AD Severe conjunctivitis or blepharitis

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Dupilumab treated Patients<br>Patients with atopic dermatitis with indication for dupilumab treatments will be observed | Other: not applicable, observational study<br>* Patients undergoing systemic therapy according to international accepted guidelines for the therapy of atopic dermatitis, observational study<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Comparison of T-cell inflammatory markers | Identification of at least one pattern recognition profile showing a strong association with responder status to dupilumab therapy | 1 year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Different T-cell pattern with dupilumab therapy | Time in which the pattern of T-cell modulation after initiation of dupilumab therapy (measured using PRI) shows significant differences from the baseline. | 1.5 years | 
| Assign recognition patterns to clinical symptoms | Association of recognition patterns with clinical symptoms of atopic dermatitis (measured using Cramer's V > 0.5) with a specific interest in conjunctivitis, pruritus, asthma and herpes infections. | 3 months | 
| Connection of molecular profile and phenotype | Classification and clustering of at least two molecular profiles of peripheral blood immune cells in relation to phenotypes of atopic dermatitis (Cramer's V either with association to IgE levels or early/late onset AD). | 3 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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dupilumab, pattern recognition, immune cells