The Allergic Rhinitis Clinical Investigator Collaborative (AR-CIC): verification of nasal allergen challenge procedures in a study utilizing an investigational immunotherapy for cat allergy.

This study supports the validity of the AR-CIC's optimised NAC protocol for conducting research of the potential efficacy of novel therapeutics in multi-centre studies.Trial registration Both studies reported herein were registered clinicaltrials.gov (NCT01383590 and NCT01383603).