Autoimmune Lymphoproliferative Syndrome: An Overview

Area of Science:

• Immunology
• Genetics
• Hematology

Background:

• Autoimmune lymphoproliferative syndrome (ALPS) is an inherited disorder.
• It is characterized by mutations in the FAS signaling pathway.
• This leads to accumulation of autoreactive T cells and various clinical symptoms.

Purpose of the Study:

• To describe the pathophysiology, diagnosis, and management of ALPS.
• To highlight the importance of recognizing ALPS for timely treatment.
• To differentiate ALPS from other conditions with similar presentations.

Main Methods:

• Review of clinical and laboratory findings in ALPS patients.
• Pathological examination of lymph node biopsies.
• Discussion of diagnostic criteria and subclassification through ancillary testing.

Main Results:

• FAS pathway defects result in double-negative T cell expansion.
• Common clinical features include cytopenias, splenomegaly, lymphadenopathy, and autoimmune disorders.
• Lymph node biopsies show characteristic paracortical expansion of double-negative T cells.

Conclusions:

• ALPS is a distinct inherited lymphoproliferative disorder.
• Accurate diagnosis relies on clinical suspicion supported by laboratory and pathological findings.
• Immunosuppressive therapy is effective in managing ALPS and its associated risks, including lymphoma.