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Histopathologic and Immunophenotypic Features of Childhood and Adult Anaplastic Large-Cell Lymphomas
Summary
The t(2;5) translocation in anaplastic large-cell lymphoma (ALCL) creates a hybrid nucleophosmin-anaplastic lymphoma kinase (NFMALK) protein. ALK1 positivity, indicating this fusion, was significantly higher in pediatric ALCL patients, suggesting a distinct disease subset.
Area of Science:
- Oncology
- Hematopathology
- Molecular Pathology
Background:
- Anaplastic large-cell lymphoma (ALCL) is characterized by specific translocations.
- The t(2;5) translocation creates a nucleophosmin-anaplastic lymphoma kinase (NFMALK) fusion protein.
- ALK1 immunostaining detects the NFMALK fusion protein.
Purpose of the Study:
- To investigate the prevalence of ALK1 positivity in ALCL.
- To correlate ALK1 status with patient age and histopathologic features.
- To explore differences in ALK1 expression between pediatric and adult ALCL cases.
Main Methods:
- Immunohistochemical staining of 40 ALCL specimens (6 pediatric, 34 adult) using antibodies against CD30, EMA, CD45, CD3, CD20, CD15, and ALK1.
- Correlation of immunostaining results with histopathologic features.
- Statistical analysis to compare ALK1 positivity rates between pediatric and adult groups.
Main Results:
- ALK1 positivity was observed in 14 out of 40 cases (35%).
- ALK1 positivity was significantly higher in pediatric patients (83%) compared to adult patients (26%) (p=0.01).
- Pediatric ALK1-positive cases showed a higher rate of EMA coexpression compared to adults.
Conclusions:
- The t(2;5) translocation and resulting NFMALK fusion protein are more prevalent in pediatric ALCL.
- ALK1 positivity in ALCL is significantly associated with younger age.
- Differences in ALK1 expression and EMA coexpression between pediatric and adult ALCL may reflect distinct pathogenetic mechanisms or prognostic implications.
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