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Gliosis specimens contain clonal cytogenetic abnormalities
C A Moertel1, R J Dahl, P G Stalboerger
1Department of Laboratory Medicine and Pathology, Mayo Clinic and Foundation, Rochester, Minnesota 55905.
Cancer Genetics and Cytogenetics
|May 1, 1993
Summary
Cytogenetic abnormalities, including sex chromosome aneusomy, were found in brain tissue from patients without tumors. Caution is advised when interpreting these findings in brain tumor specimens.
Area of Science:
- Cytogenetics
- Neuroscience
- Oncology
Background:
- The role of sex chromosome aneusomy and trisomy 7 in neoplastic brain tissue remains debated.
- Understanding these chromosomal anomalies is crucial for accurate diagnosis.
Purpose of the Study:
- To investigate the presence and significance of cytogenetic abnormalities in non-neoplastic brain tissue.
- To assess the relevance of sex chromosome anomalies in the context of brain tissue analysis.
Main Methods:
- Conventional cytogenetic analysis of 66 brain tissue specimens from patients undergoing partial cerebral resection for seizure disorders.
- Histological examination to confirm the absence of tumor cells, identifying only gliosis.
Main Results:
- Nonclonal chromosomal abnormalities were detected in 11.6% of cells across 86% of cases.
- Clonal karyotypes were observed in 11 cases, including loss of Y chromosome (6 cases) and loss of X chromosome (3 cases).
- Specific anomalies like trisomy 7, trisomy 18, and a supernumerary dic(15) chromosome were noted in some cases.
Conclusions:
- Cytogenetic abnormalities, both clonal and nonclonal, may be present in brain tissue, potentially independent of neoplastic processes.
- While in vitro artifacts are possible, these anomalies likely reflect true biological events within the brain tissue.
- Careful interpretation is essential when evaluating cytogenetic findings in brain tumor specimens due to potential non-specific anomalies.