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Simple numerical chromosome aberrations characterize pituitary adenomas.
J B Larsen1, H D Schrøder, A G Sørensen
1Department of Pathology, Odense University Hospital, Denmark.
Cancer Genetics and Cytogenetics
|November 5, 1999
Summary
Cytogenetic analysis of pituitary adenomas revealed that most tumors have normal chromosomes. However, 6 out of 28 pituitary adenomas studied showed clonal chromosome aberrations, primarily numerical anomalies.
Area of Science:
- Neuro-oncology
- Cytogenetics
- Endocrinology
Background:
- Pituitary adenomas are common intracranial neoplasms.
- Limited cytogenetic data exists for these tumors.
Purpose of the Study:
- To perform cytogenetic analysis on a series of pituitary adenomas.
- To identify chromosomal abnormalities in pituitary adenomas.
Main Methods:
- Short-term culture and karyotyping of 28 pituitary adenomas.
- Analysis included both clinically functioning and nonfunctioning adenomas.
Main Results:
- 22 out of 28 pituitary adenomas exhibited a normal karyotype.
- 6 adenomas (5 nonfunctioning, 1 prolactinoma) displayed clonal chromosome aberrations.
- Common numerical aberrations included trisomy 7, 9, 12, and 20; one tumor had X chromosome anomalies.
Conclusions:
- Cytogenetic analysis reveals frequent normal karyotypes in pituitary adenomas.
- Specific numerical chromosomal aberrations are observed in a subset of these tumors.
- Further research into the role of these aberrations in pituitary tumorigenesis is warranted.