Safety and feasibility of oral immunotherapy to multiple allergens for food allergy
© Bégin et al.; licensee BioMed Central Ltd. 2014
Received: 23 October 2013
Accepted: 15 December 2013
Published: 15 January 2014
Thirty percent of children with food allergy are allergic to more than one food. Previous studies on oral immunotherapy (OIT) for food allergy have focused on the administration of a single allergen at the time. This study aimed at evaluating the safety of a modified OIT protocol using multiple foods at one time.
Participants underwent double-blind placebo-controlled food challenges (DBPCFC) up to a cumulative dose of 182 mg of food protein to peanut followed by other nuts, sesame, dairy or egg. Those meeting inclusion criteria for peanut only were started on single-allergen OIT while those with additional allergies had up to 5 foods included in their OIT mix. Reactions during dose escalations and home dosing were recorded in a symptom diary.
Forty participants met inclusion criteria on peanut DBPCFC. Of these, 15 were mono-allergic to peanut and 25 had additional food allergies. Rates of reaction per dose did not differ significantly between the two groups (median of 3.3% and 3.7% in multi and single OIT group, respectively; p = .31). In both groups, most reactions were mild but two severe reactions requiring epinephrine occurred in each group. Dose escalations progressed similarly in both groups although, per protocol design, those on multiple food took longer to reach equivalent doses per food (median +4 mo.; p < .0001).
Preliminary data show oral immunotherapy using multiple food allergens simultaneously to be feasible and relatively safe when performed in a hospital setting with trained personnel. Additional, larger, randomized studies are required to continue to test safety and efficacy of multi-OIT.
KeywordsFood allergy Oral immunotherapy (OIT) Specific oral tolerance induction (SOTI) Multiple Safety Efficacy
Food allergy is the leading cause of fatal and recurring anaphylaxis in children and teenagers in both Europe and the United States [1–3]. The current standard of care is to practice strict avoidance of the food allergens and have injectable epinephrine readily available, in case of accidental exposure . Unfortunately, unintentional ingestion is a common occurrence .
Oral and sublingual allergen-specific immunotherapies have been proposed as possible methods of desensitization and, possibly, of induction of tolerance, with several prior studies having shown some success in using these approaches for single specific food allergens such as milk [5–11], egg [10–14], peanut [15–20], and hazelnut . These monotherapies appeared relatively safe when conducted in a supervised and controlled setting, with severe reactions requiring epinephrine being rare.
Despite these promising results, there is lack of information regarding simultaneous administration of multiple foods within the same treatment. This is an important caveat considering that 30% of food allergic participants under 18 years old are estimated to be allergic to more than one food [22–24]. This estimate has been reported to increase to 70% when considering highly atopic children . Compared to those with single food allergies, these participants experience a greater decrease in quality of life , are more likely to suffer from dietary deficiencies  and are less prone to spontaneously outgrowing their allergies .
Since OIT relies on allergen ingestion on a daily basis, mostly at home, the main concerns with simultaneous allergen administration are about safety. Previous studies using non-specific anti-IgE stimulation showed that binding of only 200 to 500 of the 250, 000 surface IgE molecules on a basophil are required to trigger degranulation . A concern is that administration of multiple allergens simultaneously would in theory result in an increased number of specific IgE molecules being simultaneously bound and cross-linked on mast cells and basophils, increasing the risk of reaching this threshold. It is also unknown whether such an approach would affect treatment efficacy. One could hypothesize that immunologic responses and memory responses to each food would be allergen specific; however, synergic effects cannot be excluded.
The primary endpoint (safety) of our investigation was the occurrence of allergic reactions throughout the course of the study, comparing food allergic participants with either peanut alone or multiple foods in their treatment.
This phase 1 study was performed in a single center in a hospital setting with Institutional Review Board approval, under Investigational New Drug (IND) approval. Participant selection, study medication and design are described in the Additional file 1. Briefly, participants older than 4 years were eligible for inclusion if they had proven sensitivity to the food allergen documented by both a skin prick test greater than 7 mm (wheal) and specific IgE greater than 2kU/L to peanut as well as positive allergic reaction in a double-blind placebo-controlled oral food challenge (DBPCFC) up to a cumulative dose of 182 mg as per Bock’s criteria . Further DBPCFC were also performed following the same protocol to nuts, sesame seed, dairy or egg to document additional food allergies. Exclusion criteria (which included severe anaphylaxis requiring ICU admission and poorly controlled asthma) are listed in the Additional file 1.
Sera at baseline and at 12 months were analyzed for food-specific IgE and IgG4 levels by immunoCAP FEIA (Thermofisher Scientific/Phadia, Kalmazoo, MI) when available. IgE antibody levels < 0.1 kUA/L and IgG4 antibody levels <0.01 kUA/L were considered undetectable. IgE antibody levels between 0.1 and 0.35 kUA/L currently have an undetermined clinical significance.
Clinical characteristics and safety data were compared between the groups using student T test for continuous and Pearson’s chi-square for dichotomic variables. Dose progression was measured as time to reach 10-fold increase from initial cumulative dose eliciting a reaction on DBPCFC to peanut as well as doses of 300, 1000 and 4000 mg protein per food allergen. Groups were compared with Kaplan-Meier curves using the Breslow test. Changes in serologies were assessed by Wilcoxon matched-pairs signed rank test.
Multiple food allergy group
Single peanut allergy group
Number of participants
Median Age in yrs. (range)
Coexisting atopic disease
Baseline testing to peanut (median and range)
SPT in mm
Specific IgE in kUA/L
DBPCFC step eliciting symptoms (mg protein)
Symptoms upon peanut DBPCFC
Other food allergies meeting DBPCFC criteria for inclusion
Number of food in mix
Multi (n = 25)
Single (n = 15)
Initial escalation day
Reactions (Reaction rate)
Median reaction rate [range]
Median reaction rate [range]
Epinephrine use (per dose)
Epinephrine use (per participant)
Participants in the monotherapy group had a similar reaction profile (Additional file 1: Figure S1). Of note, one patient in this group reported frequent mild abdominal cramping with 369 of 630 home doses (59%) (not shown in Additional file 1: Figure S1). She was able to progress normally with dose escalations and these reactions eventually subsided while on maintenance. Table 2 compares reaction rates in both groups, which did not differ significantly.
Two severe reactions requiring epinephrine occurred in each group after home dosing (Additional file 1: Table S3). In the monotherapy group, one participant had abdominal pain and wheezing within 20 minutes of food allergen ingestion and was immediately treated with injectable epinephrine; symptoms resolved within 6 minutes of treatment. Another participant had urticaria and wheezing within 40 minutes of food allergen ingestion and was immediately treated with injectable epinephrine; symptoms resolved within 5 minutes of treatment. In the multi-allergen group, one participant had wheezing and angioedema around the eyes within 25 minutes of food allergen ingestion, and the reaction resolved within 3 minutes following administration of injectable epinephrine. The other participant on multi OIT with a severe reaction had abdominal pain, urticaria, and wheezing within 35 minutes of food allergen ingestion and was immediately treated with injectable epinephrine; symptoms resolved within 6 minutes of treatment.
In this phase 1 study, we have shown that participants allergic to multiple foods can be safely desensitized to up to five foods simultaneously using a modified OIT protocol. Despite the increasing interest in food OIT in recent years, the safety or efficacy of using multiple food flour/powder allergens in parallel has, to our knowledge, not been published. These findings are particularly relevant considering the already high and likely growing number of food allergic participants who are allergic to more than one food allergen [22–25].
The multi OIT study was designed as a proof of concept, phase 1 study; therefore, safety measurements were the primary endpoint. The rate of reactions observed in the multi-allergen OIT group was within the acceptable range for an OIT study and was similar to a reference cohort of peanut mono-allergic participants undergoing the same protocol to peanut only. This supports the view that it is not the diversity or multiplicity of the food allergen binding surface IgE but rather the total dose of allergen administered that determines OIT reactions. However, this data should be viewed as proof of concept data until randomized, controlled, double-blinded phase 2 studies with larger sample sizes are performed.
In previous single OIT studies, overall reaction rates tended to vary, possibly due to differences in escalation protocols, allergens, selection of participants or use of anti-histamine pre-medication [7–9, 13–15, 19]. However, severe reactions needing epinephrine injections have been consistently shown to be an occurrence, albeit rare, when performing OIT. In our study, 2 participants from each group required epinephrine during the study period. Although the number of allergens did not seem to increase the risk of severe reactions, a state of continual vigilance is needed to perform OIT. As most reactions occurred at home (including those severe reactions requiring injectable epinephrine), participants and families carry reaction medications at all times and are educated on the proper use of injectable epinephrine and on the recognition of severe reactions that warrant its use. It is also important that the food doses be from a verifiable and reproducible source, that they be carefully measured and cross-checked by clinical staff and stored and dispensed from an appropriate facility.
We chose to proceed with a single dose of each food in an equal protein stoichiometric ratio. In some smaller children that are slow eaters, the process of eating their dose could take up to 1 hour with a mix of 5 nuts at full dose. In such cases, it would not have been feasible to wait in between foods for the occurrence of a reaction. Our final maintenance dose was 4000 mg per allergen. The optimal long term maintenance dose for food OIT has not been identified yet and may need to be individualized. More studies are needed to determine this parameter of OIT which may have an impact on subject compliance with ingestion.
Except for one participant who was excluded due to eczema flares and two drop-outs, all participants reached a 10 fold increase in their reaction threshold during the study period. The median time at which participants on single allergen OIT reached this dose was 14 weeks earlier than for those on the multi-allergen therapy. Participants undergoing multi-allergen OIT also took more time reaching the 300 mg, 1000 mg and 4000 mg doses. This delay is to be expected since there were up to 5 food allergens given simultaneously and the dose for each individual food allergen was divided evenly. Importantly, this phase 1 study demonstrates that it is possible and feasible to test the effect of multi food allergen therapy simultaneously, rather than performing single immunotherapy in sequence for patients, a process that could take many years for patients who are multi-sensitized to food allergens.
Although no SCORAD was calculated, it is worth noting that the participant that failed the initial dose escalation had significantly more severe eczema than other participants, for which he reported a history of systemic treatment and a clear relation with ingestion of food allergens. The eczema was active at enrolment despite topical treatment.
Despite showing proper dose progression, our study did not prove treatment efficacy. To measure true clinical tolerance, participants would have to stop their maintenance dose and demonstrate sustained unresponsiveness on a challenge after weeks to months of avoidance, which was beyond the scope of this study .
Serological analysis did show an increase in peanut-specific IgG4 similar to the monotherapy group. Peanut-specific IgE were stable after one year but this was not unexpected, as previous reports have shown that food specific IgE may start decreasing below baseline levels only after the first year of therapy [8, 13, 16, 32].
One limitation to this study was the absence of randomization. This said, this is not a requirement for phase 1 studies. The single and multiple allergic participant were part of the same protocol. We cannot rule out that the molecular sensitization profile could be different in multi-allergic participants that exhibit cross-reactivity with other nuts as it was not tested fully. Regardless, these proof of concept results show that OIT to multiple foods might be as safe as peanut OIT in single-allergic participants.
In conclusion, using a modified OIT protocol we have shown that simultaneous desensitization to multiple foods is feasible and worthy of further study. The reaction profile compared to that of peanut single-allergic participants undergoing monotherapy and participants showed comparable changes on serological examination. At this time, OIT should be considered an experimental treatment and should be conducted by trained research personnel in a hospital setting. Randomized, placebo-controlled phase 2 multicenter trials are needed to continue to determine safety and efficacy parameters of multi OIT in multi-allergic participants.
Chemistry and manufacturing control
Double-blind placebo-controlled food challenge
Investigational new drug
Funding for this study was provided by philanthropy and by the Food Allergy Research and Education.
The authors would like to acknowledge Bruce Barnett PhD and Jelena Berglund PhD for their review of good manufacturing practices. We would like to thank members of the DSMB for their review of the safety data. We thank the FDA for their review of the IND and CMC sections. Philippe Bégin MD FRCPC was supported by AllerGen NCE Inc. (the Allergy, Gene and Environment Network), a member of the Networks of Centre of Excellence Canada program.
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