Immune Dysregulation in Pediatric Common Variable Immunodeficiency: Implications for the Diagnostic Approach

Area of Science:

• Pediatric Immunology
• Clinical Immunology
• Immunodeficiency Disorders

Background:

• Common variable immunodeficiency (CVID) is characterized by recurrent infections, a major cause of morbidity and mortality.
• Pediatric CVID encompasses a broader spectrum beyond infections, including autoimmune, allergic, lymphoproliferative, and malignant disorders.
• Understanding immune dysregulation is crucial for managing non-infectious complications in pediatric CVID.

Purpose of the Study:

• To investigate the role of immune dysregulation and the frequency of non-infectious sequelae in children with CVID.
• To gain insight into the pathogenesis of non-infectious complications in pediatric CVID.
• To delineate the diagnostic approach for pediatric CVID, focusing on immune dysregulation.

Main Methods:

• Retrospective analysis of clinical manifestations in 39 children with CVID.
• Correlation of clinical data with selected immune parameters.
• Evaluation of B- and T-cell subsets in relation to immune dysregulation phenotypes.

Main Results:

• All 39 children experienced recurrent sinopulmonary infections (100%).
• Non-infectious disorders and immune dysregulation were observed in 82.05% of patients.
• Common comorbidities included asthma (53.85%), autoimmune disorders (46.15%), lymphoproliferation (35.90%), and malignancies (5.13%).

Conclusions:

• Pediatric CVID exhibits a high prevalence of immune dysregulation and non-infectious complications, posing diagnostic and clinical challenges.
• Significant reductions in switched memory B cells, naive T helper cells, and regulatory T cells were associated with autoimmunity in CVID.
• The study underscores the variability of humoral and cellular immune defects in pediatric CVID with immune dysregulation.