Xolair Enhances Oral Desensitization in Peanut Allergic Patients

Phase 1

Completed

Conditions: Peanut Allergy

Interventions: Drug: Omalizumab

Registration Number: NCT01290913

Lead Sponsor: Lynda Schneider

Brief Summary: This is a pilot feasibility study, using Xolair pretreatment for oral peanut desensitization.

Detailed Description: We hypothesize that pretreatment with anti-IgE mAb will greatly reduce the side effects and allergic reactions that occur during oral desensitization to peanut and will enhance the development of oral tolerance in patients with severe peanut allergy.

We will follow the patients for 5 years following study completion.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 13

Inclusion Criteria

Patients with severe peanut allergy, between the ages of 7-25 years, having a history of significant clinical symptoms within 1 hr of peanut ingestion.
Total IgE >50 kU/L but <2,0000 kU/L.
Sensitivity to peanut will be documented by a positive skin prick test result and RAST test to peanut, with 20 kU/L as a lower limit for eligibility.
Patients must also fail a double blind food challenge with peanut at a dose of 100 mg or less (after a cumulative dose of 186 mg), with minimal or no reactions to the placebo challenge.
All female subjects of childbearing potential will be required to provide a urine sample for pregnancy testing that must be negative one week before being allowed to participate in the study.
Subjects must be planning to remain in the study area during the trial.
Subjects and/or their parents must be trained on the proper use of the Epi-Pen to be allowed to enroll in the study.

Exclusion Criteria

Due to the risk of serious systemic anaphylactic reactions to peanut in this study, we will exclude:

Patients with acute infections, autoimmune disease, severe cardiac disease, and those who are treated with beta-adrenergic antagonistic drugs (beta-blockers, which increase the risk of more serious symptoms of anaphylaxis).
Subjects having a history of severe anaphylaxis to peanut requiring intubation or admission to an ICU, frequent urticaria, or history consistent with poorly controlled persistent asthma.
Total IgE > 2,000 IU/mL.
Subjects with unstable angina, significant arrhythmia, uncontrolled hypertension, chronic sinusitis, or other chronic or immunological diseases that in the mind of the investigator might interfere with the evaluation or administration of the test drug or pose additional risk to the subject e.g. gastrointestinal or gastroesophageal disease, chronic infections, scleroderma, hepatic and gallbladder disease, chronic non-allergic pulmonary disease.
Subject with an FEV1 or PEF less than 80% predicted with or without controller medication (if able to perform the maneuver) at screening, the oral desensitization visit, or food challenge visit.
Subjects who have received an experimental drug in the last 30 days prior to admission into this study or who plan to use an experimental drug during the study, who are current users of oral, intramuscular, or intravenous corticosteroids, or tricyclic antidepressants, or who are using medication that could induce adverse gastrointestinal reactions during the study.
Subjects refusing to sign the EpiPen Training Form.
Pregnant or breast-feeding females.
Subjects with severe food associated eczema, dermatitis herpetiformis, eosinophilic esophagitis, eosinophilic enteritis, proctocolitis, food protein induced enterocolitis syndrome (FPIES) or other gastrointestinal diseases. These requirements are necessary to limit the study to patients with primarily IgE mediated peanut allergy, and to exclude patients with peanut sensitivity mediated by cellular/T cell (non-IgE mediated) mechanisms.

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
omalizumab, oral desensitization	Omalizumab	Patients receive omalizumab along with oral peanut desensitization.

Primary Outcome Measures

Name	Time	Method
Number of Participants That Tolerated Rapid Oral Peanut Desensitization to a Dose of 500 mg Peanut Flour (Cumulative Dose, 1,000 mg)	First day of desensitization	To tolerate refers to the ability of the patient to ingest the challenge dose of 500 mg peanut flour (1000 mg cumulatively) with either no or mild symptoms.

Secondary Outcome Measures

Name	Time	Method
Number of Participants That Tolerated Rapid Oral Peanut Desensitization to a Dose of 4,000 mg of Peanut Flour.	after 7-8 wks of desensitization	To tolerate refers to the ability of the patient to ingest the final challenge of 4000mg peanut flour, with either no or mild symptoms.