[Common variable immunodeficiency disorders: Part 2. Updated clinical manifestations and therapeutic management]

Area of Science:

• Immunology
• Clinical Medicine
• Genetics

Background:

• Common variable immunodeficiency (CVID) is the most frequent symptomatic primary antibody deficiency in adults.
• CVID predominantly manifests as recurrent upper respiratory tract infections, primarily caused by Streptococcus pneumoniae and H. influenzae.
• A significant proportion of CVID patients (20-30%) develop complex non-infectious complications.

Purpose of the Study:

• To review the current understanding of non-infectious manifestations in CVID.
• To highlight the correlation between these complications and specific B-cell deficits.
• To discuss the impact of complications on patient prognosis and future therapeutic directions.

Main Methods:

• Literature review of CVID manifestations, focusing on non-infectious complications.
• Analysis of the relationship between B-cell subsets and disease complications.
• Evaluation of current treatment outcomes and identification of areas for future research.

Main Results:

• Non-infectious complications include autoimmune phenomena, lymphoproliferation, granulomas, and cancers.
• Antibody-mediated cytopenias are common, linked to reduced circulating switched memory B cells.
• Prognosis remains poor with digestive, pulmonary, or lymphomatous complications, despite immunoglobulin replacement therapy.

Conclusions:

• While immunoglobulin therapy improves outcomes, severe non-infectious complications in CVID necessitate further therapeutic advancements.
• Targeted treatments for non-infectious CVID complications are needed, informed by ongoing genetic and immunological research.
• Future research should focus on understanding the underlying mechanisms of non-infectious manifestations to develop personalized therapies.