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[Heavy chain diseases]
1Service d'immuno-hématologie, hôpital Saint-Louis, Paris.
Insights
Heavy chain diseases (HCD) involve abnormal immunoglobulin production. Alpha chain disease, the most common HCD, presents with digestive issues and can progress to lymphoma.
Area of Science:
- Immunology
- Hematology
- Oncology
Context:
- Heavy chain diseases (HCD) are rare immunoproliferative neoplasms.
- Characterized by monoclonal immunoglobulin heavy chains lacking light chains.
- Diagnosis relies on immunoelectrophoresis or immunofixation.
Purpose:
- To describe the clinicopathologic features of different types of HCD.
- To highlight diagnostic methods and disease progression.
- To explore the pathogenesis of lymphoid proliferations in alpha HCD.
Summary:
- Gamma HCD presents heterogeneously, sometimes mimicking macroglobulinemia with frequent autoimmune disorders.
- Mu HCD is rare, often resembling chronic lymphocytic leukemia with specific bone marrow findings.
- Alpha HCD, the most frequent type, typically manifests as a digestive disorder with malabsorption, potentially progressing to lymphoma.
Impact:
- Understanding HCD subtypes aids in accurate diagnosis and patient management.
- Insights into alpha HCD pathogenesis may illuminate mechanisms of lymphoid malignancies.
- This review provides a comprehensive overview for clinicians and researchers in the field.
Abstract:
Heavy chain diseases (HCD) are immunoproliferative disorders characterized by the production of monoclonal immunoglobulin molecules composed of deleted heavy chains devoid of light chains. The diagnosis is established by immunoelectrophoresis (possibly combined to immunoselection) or immunofixation. The clinicopathologic features of gamma HCD are heterogenous, often somewhat similar to macroglobulinemia. Some patients show no evidence of underlying malignant lymphoproliferation. Autoimmune disorders are frequent. mu HCD is rare and often presents as chronic lymphocytic leukemia with hepatosplenomegaly and vacuolated plasma cells on bone marrow smears. Alpha chain disease is the most frequent. In its usual digestive form, the clinicopathologic pattern is uniform. The main clinical features are chronic diarrhea and severe malabsorption syndrome. At the initial stage, there is a diffuse lymphoplasmocytic infiltration of the small intestine and mesenteric nodes, sometimes reversible after treatment by antibiotics alone. At the terminal stage, a malignant lymphoma, often of immunoblastic type, occurs. The natural history and epidemiology of alpha HCD should provide insights into the pathogenesis of malignant lymphoid proliferations.