Luminex-based Assay to Identify Major IgE-binding Episode Among IgE-mediated Wheat-allergic Patient

Wheat Allergy Clinical Trial

Official title:

Luminex-based Assay to Identify Major IgE-binding Episode Among IgE-mediated Wheat-allergic Patient

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT04100122
• Other study ID #: 359/2562(EC3)
• Status: Completed
• Start date: September 13, 2019
• Est. completion date: December 31, 2022

Study information

• Verified date: May 2023
• Source: Mahidol University
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

This study will be using Luminex-based peptide assay (LPA) to determine major IgE-binding epitope among wheat allergic children to differentiate clinical phenotype.

Description:

Luminex-based peptide assay (LPA) is a novel tool using machine learning techniques, developed to predict different degrees of food allergy has been successfully reported among cow's milk protein allergy. This technique provide a more precise and advanced adaptation from microarray-based immunoassay (MIA). Using this technique will aid us for the differentiation of clinical phenotypes of wheat-allergic patients. This study will be the first study to date using this technique aim to determine major IgE-binding epitope among immediated-reaction of wheat allergic children to differentiate clinical phenotypes, and may lead to further study to develop the new therapeutic approach to wheat-allergic patients.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 100
• Est. completion date: December 31, 2022
• Est. primary completion date: December 31, 2022
• Accepts healthy volunteers: No
• Gender: All
• Age group: 1 Year to 18 Years

Eligibility

Inclusion criteria

1. Patients with IgE-mediated wheat allergy, with one of the following criteria; 1.1 a convincing clinical history of the reactions within 4 hours after wheat ingestion during the past 12 months combined with positive skin prick test (SPT) and/or the level of specific IgE (sIgE) to wheat or 1.2 a positive oral food challenge (OFC) result to wheat during the past 12 months OR

2. Patients with wheat tolerant confirmed by negative oral food challenge (OFC) result to wheat during the past 12 months OR

3. Patients with IgE-mediated wheat allergy and underwent wheat oral immunotherapy for at least 6 months or at the maintenance phase of the treatment

Exclusion criteria Patients with delayed allergic reactions after wheat ingestion greater than 4 hours

Related Conditions & MeSH terms

• Wheat Allergy
• Wheat Hypersensitivity

Intervention

Procedure:
• Blood drawing
Blood drawn will be done once using 15 mL of blood volume (Serum or plasma samples will be collected during the routine follow up of level of sIgE to wheat or during the oral food challenge test which intravenous insertion routinely prepared in case of the emergency reaction occurred). The specimen will be transferred to the Icahn School of Medicine at Mount Sinai, New York, USA for Laboratory processing (Luminex-based peptide assay)

Locations

Country	Name	City	State
Thailand	Siriraj Hospital	Bangkoknoi	Bangkok

Sponsors (3)

Lead Sponsor	Collaborator
Mahidol University	Icahn School of Medicine at Mount Sinai, Samitivej Hospital group

Country where clinical trial is conducted

Thailand, 

References & Publications (1)

Suarez-Farinas M, Suprun M, Chang HL, Gimenez G, Grishina G, Getts R, Nadeau K, Wood RA, Sampson HA. Predicting development of sustained unresponsiveness to milk oral immunotherapy using epitope-specific antibody binding profiles. J Allergy Clin Immunol. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Major Immunoglobulin (Ig) E-binding epitope on wheat proteins and serum/plasma of patients	For Luminex data, the binding intensity of antibody to epitope specific beads was calculated from the florescence signal of each bead. An index score of binding intensity was generated from the log2 transformation of the signal-to-background ratio and each peptide element, which was close to a normal distribution. A plate effect was observed and adjusted for using linear models. Antibody binding intensities (Luminex) from different groups were compared. To assess the changes in epitope-binding profiles, a linear model was used with group as a factor. Comparisons of interests were tested using t tests and resultant P-values were adjusted for multiple hypotheses using the Benjamini-Hochberg approach, which controls the false discovery rate (FDR) across epitopes. Epitopes were defined as differentially binding epitopes (DBE) if the FDR < 0.05 and fold changes (FCH) > 1.5.	48 months
Secondary	Predict different severity of wheat hypersensitivity reaction	For Luminex data, the binding intensity of antibody to epitope specific beads was calculated from the florescence signal of each bead. An index score of binding intensity was generated from the log2 transformation of the signal-to-background ratio and each peptide element, which was close to a normal distribution. A plate effect was observed and adjusted for using linear models. Antibody binding intensities (Luminex) from different groups were compared. To assess the changes in epitope-binding profiles, a linear model was used with group as a factor. Comparisons of interests were tested using t tests and resultant P-values were adjusted for multiple hypotheses using the Benjamini-Hochberg approach, which controls the false discovery rate (FDR) across epitopes. Epitopes were defined as differentially binding epitopes (DBE) if the FDR < 0.05 and fold changes (FCH) > 1.5.	48 months