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Peripheral T cell lymphoma: immunologic and cell-kinetic observations associated with morphological progression
Blood
|October 1, 1985
Summary
This study details a rare case of peripheral T cell lymphoma (PTCL) in a child, highlighting its evolving characteristics. The findings emphasize the need for multidisciplinary evaluation of PTCLs due to their dynamic nature.
Area of Science:
- Hematology
- Oncology
- Immunology
Background:
- Peripheral T cell lymphomas (PTCLs) are a heterogeneous group of non-Hodgkin's lymphomas.
- PTCLs typically exhibit immunophenotypes of mature T cells, often helper T cells.
Observation:
- A 13-year-old girl with PTCL showed evolving clinical, morphological, immunologic, and cell-kinetic features.
- Early PTCL presented as diffuse mixed-cell lymphoma and focal large-cell lymphoma (LCL) from an atypical immune response (AIR).
- Later stages showed diffuse pleomorphic LCL with dedifferentiated T cells and increased S-phase cells.
Findings:
- The patient's PTCL demonstrated an immature T cell immunophenotype initially, progressing to a dedifferentiated state.
- Cell kinetics shifted from no aneuploidy to a distinct aneuploid population with increased S-phase cells.
- The final immunophenotype was indistinguishable from non-B non-T cell lymphoma.
Implications:
- Atypical immune response (AIR) may represent a prelymphomatous state or a morphological manifestation of PTCL.
- PTCLs exhibit rapidly changing characteristics, necessitating multidisciplinary assessment.
- This case underscores the complex and dynamic nature of pediatric PTCL.