Analyzing phenotypes post-exposure in allergic rhinitis in the environmental exposure unit

Area of Science:

• Allergy and Immunology
• Respiratory Medicine
• Clinical Phenotyping

Background:

• Previous research defined allergic rhinitis (AR) phenotypes based on symptom scores post-allergen exposure.
• Understanding AR phenotypes is crucial for targeted treatment strategies.

Purpose of the Study:

• To validate established AR phenotypes using a larger dataset across diverse allergens (birch, grass, ragweed, house dust mite).
• To assess the consistency of AR phenotypes in an environmental exposure unit setting.

Main Methods:

• Utilized the Analyzing Phenotypes Post-Exposure in Allergic Rhinitis (APPEAR) database (153 participants).
• Collected data on Total Nasal Symptom Score (TNSS), nasal congestion, and peak nasal inspiratory flow (%ΔPB).
• Applied previously defined criteria for phenotyping participants into early-phase responders (EPRs), protracted EPRs (pEPRs), dual responders (DRs), and low responders (LoRs).

Main Results:

• Identified 65 EPRs, 58 pEPRs, 13 DRs, and 17 LoRs.
• Demonstrated significant negative correlations between TNSS and %ΔPB.
• pEPRs showed significantly higher TNSS during the late-phase response compared to other phenotypes.
• DRs and pEPRs exhibited significantly higher TNSS by study end compared to EPRs and LoRs.

Conclusions:

• Distinct allergic rhinitis phenotypes are confirmed in the late-phase response across multiple allergens.
• The findings validate AR phenotypes in a larger cohort, suggesting potential clinical benefits.
• This research supports the use of phenotyping for improved allergic rhinitis management.