ArticleAllergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology2025
Evaluating the efficacy of a novel home-based oral food challenge protocol for pediatric food protein induced enterocolitis syndrome.
Article in Allergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundOral food challenges (OFCs) are considered the gold standard for diagnosis of food protein-induced enterocolitis syndrome (FPIES), a non-immunoglobulin E mediated gastrointestinal food allergy characterized by delayed, repetitive vomiting, lethargy, and sometimes diarrhea, primarily affecting infants and young children. Our modified approach to OFCs involves smaller, gradually increased doses to mitigate the risk of severe reactions. We aimed to measure the successful completion of this OFC protocol.
methodsIn a retrospective chart review, patients age < 18 years, who had 1 + episode of acute FPIES between 2015 and 2023 were identified using an allergy clinic database. Patients underwent OFCs with home up dosing every 2-4 weeks. Steps included 1%, 2%, 5%, 10%, 20%, 30%, 40%, 60%, 80%, and 100% of the final serving amount. The primary outcome was successful completion, i.e. absence of severe reactions during the OFC protocol and 1 year after. Data were analysed using logistic regression and reported as odds ratios (OR) and 95% confidence intervals (95% CI). Results were adjusted for multiple allergic comorbidities, age of FPIES onset, and biological sex.
resultsAmong 47 patients who began the OFC protocol, 38 (80.85%) completed it without significant reactions. Of the 9 (19.14%) who did not complete the protocol, 4 (44.4%) paused due to reactions, and 5 (55.6%) paused due to non-FPIES symptoms. The 4 reactors paused due to mild-to-moderate reactions; there were no severe reactions during the protocol. There were no significant associations identified between OFC completion and severity of symptoms (OR 1.05; 95% CI 0.24-4.71; p = 0.94); age at onset of symptoms (OR 0.99; 95% CI 0.94-1.02; p = 0.58); or age of starting OFC (OR 1.00; 95% CI 0.98-1.02; p = 0.90). Patients who reacted to milk tended to be less likely to complete the protocol than those reacting to other foods (OR 0.28; 95% CI 0.07-1.06; p = 0.06).
conclusionsThis study supports the potential for a home-based gradual approach to OFCs in FPIES, evidenced by a high completion rate and no severe reactions.
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