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Cytogenetic aberrations in perineurioma: variation with subtype
Jane E Brock1, Antonio R Perez-Atayde, Harry P W Kozakewich
1Department of Pathology, Children's Hospital and Harvard Medical School, Boston, MA 02115, USA.
The American Journal of Surgical Pathology
|August 13, 2005
Summary
Perineuriomas in children often have simple karyotypes with few chromosomal changes. Aberrations involving chromosome 10q are consistently found in sclerosing perineuriomas, suggesting specific genetic drivers.
Area of Science:
- Oncology
- Genetics
- Pediatric Pathology
Background:
- Perineuriomas are rare tumors of nerve sheath origin.
- Previous cytogenetic studies on perineuriomas are limited, with only two karyotypes reported.
- Understanding the genetic basis of perineurioma is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate the clinicopathologic and cytogenetic features of pediatric perineuriomas.
- To identify recurrent chromosomal abnormalities in different subtypes of perineurioma.
- To elucidate the potential genetic mechanisms underlying perineurioma development.
Main Methods:
- Analysis of four pediatric perineuriomas: two sclerosing, one intraneural, and one soft tissue.
- Clinicopathologic evaluation including immunohistochemistry (EMA) and ultrastructural analysis.
- Conventional cytogenetics (karyotyping) and fluorescence in situ hybridization (FISH) for ALK rearrangement.
Main Results:
- All lesions exhibited perineurial differentiation.
- Karyotypes were generally simple, with one or few chromosomal rearrangements or numerical changes.
- Consistent findings in sclerosing perineuriomas included chromosome 10 aberrations (e.g., t(2;10), monosomy 10).
- Chromosome 22 abnormalities were also noted, expanding previous findings.
Conclusions:
- Pediatric perineuriomas typically present with simple karyotypes.
- Rearrangements and deletions of chromosome 10q appear characteristic of sclerosing perineuriomas.
- Chromosome 22 abnormalities may also play a role in perineurioma pathogenesis.
- Diverse genetic mechanisms likely contribute to perineurioma tumorigenesis, potentially varying by subtype.