Lymphoproliferative disorders associated with congenital immunodeficiencies

Area of Science:

• Hematopathology
• Immunology
• Molecular Biology

Background:

• Congenital immunodeficiencies (CIDs) are frequently associated with lymphoproliferative disorders (LPD).
• Key CIDs linked to LPD include Wiskott-Aldrich syndrome (WAS), common variable immunodeficiency (CVID), ataxia telangiectasia (AT), severe combined immunodeficiency (SCID), X-linked lymphoproliferative disorder (XLP), and hyper-IgM syndrome.
• Epstein-Barr virus (EBV) significantly contributes to LPD development in several CID types.

Purpose of the Study:

• To review clinicopathologic, immunologic, and molecular features of CIDs and associated LPD.
• To present cases from the Third Slide Workshop of the Society of Hematopathology.
• To highlight the interplay between specific immunodeficiencies, risk factors, and LPD patterns.

Main Methods:

• Review of clinicopathologic, immunologic, and molecular biological data.
• Analysis of cases presented at a specialized workshop.
• Integration of clinical, histopathologic, immunophenotypic, and molecular findings.

Main Results:

• Ataxia telangiectasia (AT) involves DNA repair defects, with lymphomas/leukemias appearing earlier than in sporadic cases.
• EBV is a critical factor in LPD associated with WAS, CVID, SCID, and XLP.
• Monoclonality in LPD does not always predict an aggressive clinical course, as seen in some WAS cases.

Conclusions:

• A comprehensive approach combining clinical, histopathologic, and molecular data is essential for evaluating LPD in patients with CIDs.
• Understanding the specific risk factors and viral associations for each CID is crucial for managing LPD.
• Immunophenotypic and molecular clonality findings require careful interpretation in the context of clinical behavior.