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Recurrent translocations involving the IRF4 oncogene locus in peripheral T-cell lymphomas
A L Feldman1, M Law, E D Remstein
1Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA. feldman.andrew@mayo.edu
Leukemia
|November 7, 2008
Summary
Researchers discovered new recurrent translocations involving the IRF4 gene in peripheral T-cell lymphomas (PTCLs). These IRF4 translocations, previously unknown in PTCLs, may serve as diagnostic markers and potential therapeutic targets for specific lymphoma subtypes.
Area of Science:
- Hematology
- Oncology
- Genetics
Background:
- Chromosomal translocations are key in hematopoietic tumors, acting as diagnostic markers and therapeutic targets.
- Translocations in peripheral T-cell lymphomas (PTCLs) are less understood compared to myeloid and B-cell neoplasms.
Purpose of the Study:
- To identify recurrent chromosomal translocations involving the IRF4 locus in PTCLs.
- To investigate the clinical significance and potential therapeutic implications of IRF4 translocations in PTCLs.
Main Methods:
- Fluorescence in situ hybridization (FISH) was used to analyze 169 PTCL samples.
- Identified and characterized translocations involving the IRF4 gene and the T-cell receptor-alpha (TCRA) locus.
Main Results:
- Recurrent translocations involving the IRF4 locus were identified in 12 out of 169 PTCL cases.
- Two cases of cytotoxic PTCL, unspecified (PTCL-Us) showed IRF4/TCRA translocations, affecting bone marrow and skin.
- Eight cases of cutaneous anaplastic large-cell lymphoma (ALCL) exhibited IRF4 translocations without TCRA rearrangements.
Conclusions:
- IRF4 translocations represent a novel, recurrent genetic abnormality in PTCLs.
- IRF4/TCRA translocations in cytotoxic PTCL-Us may indicate a distinct clinicopathologic entity.
- IRF4 translocations, particularly in cutaneous ALCLs, offer potential diagnostic utility and identify MUM1/IRF4 as a possible therapeutic target.
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