Selective IgE deficiency, immune dysregulation, and autoimmunity

Area of Science:

• Immunology
• Epidemiology
• Clinical Medicine

Background:

• Selective IgE deficiency (IgED) is defined as serum IgE <2 kIU/L with normal immunoglobulins.
• Large-scale epidemiological data on IgED prevalence and clinical features are lacking.

Purpose of the Study:

• To investigate the clinical and laboratory characteristics of patients with IgED.
• To determine the prevalence and associated comorbidities of IgED in a population-based study.

Main Methods:

• A population-based case-control study involving 18,487 subjects with serum IgE measurements.
• Cases (IgE <2 kIU/L) were compared to controls (1:4 ratio) matched for age.
• Comorbidities were identified using ICD-9-CM codes.

Main Results:

• 226 subjects met IgED criteria; 30.9% were children and 69.1% were adults.
• Children with IgED showed higher rates of asthma and hyperreactive airways.
• Both children and adults with IgED had increased prevalence of chronic sinusitis, otitis media, autoimmune diseases, and cancers.

Conclusions:

• Low serum IgE levels may indicate immune dysregulation.
• IgED is associated with a higher prevalence of various chronic inflammatory, autoimmune, and oncological conditions.
• Further research is warranted to understand the implications of IgED.