Allergen exposure chambers: harmonizing current concepts and projecting the needs for the future - an EAACI Position...

Area of Science:

• Clinical immunology and allergy research
• Respiratory medicine
• Pharmacological studies

Background:

• Allergen exposure chambers (AECs) facilitate controlled allergen exposure for studying respiratory allergic diseases and testing new therapies.
• Current AEC studies are often monocentric with unique protocols, limiting extrapolation and regulatory acceptance.
• AECs offer advantages over traditional field trials but require standardization due to technical variations.

Purpose of the Study:

• To harmonize concepts and identify unmet needs for standardizing allergen exposure chambers (AECs).
• To enhance the use of AECs for evaluating the safety and efficacy of novel therapeutics.
• To facilitate regulatory approval and basic immunological research through standardized AEC protocols.

Main Methods:

• A European Academy of Allergy and Clinical Immunology (EAACI) task force convened experts from academia, regulatory agencies, and chamber operators.
• The initiative focused on identifying technical, clinical, and regulatory unmet needs for AECs.
• Prerequisites for the clinical validation of AECs were systematically evaluated.

Main Results:

• Key areas addressed include the validation process, standardization of allergen challenges, and outcome measures.
• Intra- and inter-chamber variability and reproducibility were assessed.
• Comparisons with field trials, pediatric considerations, and regulatory aspects were discussed.

Conclusions:

• Harmonizing AEC concepts and addressing unmet needs are essential for future progress.
• Standardization will improve the reliability and regulatory acceptance of AEC studies.
• This position paper provides a framework for advancing the use of AECs in therapeutic development.