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Clonal composition of glioblastoma multiforme
R A Berkman1, W C Clark, A Saxena
1Surgical Neurology Branch, National Institute of Neurologic Disorders and Stroke, National Institutes of Health, Bethesda, Maryland.
Journal of Neurosurgery
|September 1, 1992
Summary
Glioblastoma multiforme tumors are monoclonal, originating from a single astrocyte. Genetic analysis of X-chromosome inactivation and chromosomal deletions supports this finding in central nervous system neoplasms.
Area of Science:
- Neuro-oncology
- Cancer Genetics
- Molecular Biology
Background:
- Glioblastoma multiforme (GBM) is the most aggressive primary brain tumor.
- GBM exhibits significant phenotypic and biological heterogeneity.
- Tumor heterogeneity may arise from monoclonal or polyclonal origins.
Purpose of the Study:
- To determine the clonal composition of glioblastoma multiforme.
- To investigate whether GBM originates from a single transformed cell or multiple distinct cell populations.
Main Methods:
- Analysis of X-chromosome inactivation patterns in heterozygous female patients.
- Detection of tumor-specific somatic deletions on chromosomes 10 and 17.
- Studied 10 glioblastoma multiforme tumors from nine female patients.
Main Results:
- Nine out of ten GBMs showed a monoclonal pattern via X-chromosome inactivation analysis.
- Somatic deletions on chromosomes 10 and/or 17 were identified in nine tumors.
- These genetic alterations support a monoclonal origin for the studied GBMs.
Conclusions:
- Glioblastoma multiforme is predominantly a monoclonal neoplasm.
- Tumorigenesis likely involves the clonal expansion of a single astrocyte with critical genetic alterations.
- Key genetic events, particularly on chromosomes 10 and/or 17, are fundamental to GBM development.