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Comparative genomic hybridization analysis of nonfunctioning pituitary tumors
M Daniely1, A Aviram, E F Adams
1Institute of Genetics, Chaim Sheba Medical Center, Tel-Hashomer, Israel.
The Journal of Clinical Endocrinology and Metabolism
|May 20, 1998
Summary
Clinically nonfunctioning pituitary adenomas have poorly understood molecular mechanisms. This study identified novel chromosomal regions involved in their tumorigenesis, suggesting new genetic targets for nonfunctioning pituitary tumors.
Area of Science:
- Endocrinology
- Oncology
- Genetics
Background:
- Clinically nonfunctioning pituitary adenomas (NFPA) are monoclonal tumors representing one-third of pituitary neoplasms.
- The molecular pathogenesis of NFPA remains largely unknown, with few somatic genetic alterations identified.
- Previous studies implicated candidate genes (gsp, ras, p53) and chromosomal regions (11q, 13q) in NFPA development.
Purpose of the Study:
- To investigate chromosomal regions harboring genes involved in nonfunctioning pituitary tumorigenesis.
- To identify novel genetic alterations contributing to NFPA development.
Main Methods:
- Comparative genomic hybridization (CGH) was employed to analyze chromosomal abnormalities in 23 NFPA samples.
- Analysis focused on identifying gains, losses, and amplifications across all chromosomes.
Main Results:
- Seventy-four percent (17 of 23) of NFPA exhibited chromosomal abnormalities.
- Sex chromosome and chromosome 18 aberrations were observed in 34.7% of tumors.
- Nonrandom DNA amplifications were detected in specific sub-chromosomal regions including 4q, 5q, 9p, 13q, and 17q.
Conclusions:
- Genes located in previously undescribed chromosomal regions play a significant role in NFPA tumorigenesis.
- The findings expand our understanding of the genetic landscape of nonfunctioning pituitary adenomas.
- This research may guide future investigations into novel therapeutic targets for NFPA.