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Clonal origin of pituitary adenomas
1Department of Medicine, Cedars-Sinai Medical Center-University of California School of Medicine, Los Angeles 90048.
The Journal of Clinical Endocrinology and Metabolism
|December 1, 1990
Summary
Pituitary adenomas, common tumors, were found to be monoclonal, indicating early somatic cell mutations drive their growth. This study analyzed tumor cell types and clonality in female patients, revealing insights into pituitary tumorigenesis.
Area of Science:
- Endocrinology
- Oncology
- Genetics
Background:
- The precise mechanisms driving pituitary adenoma development are not fully understood.
- Pituitary adenomas are common neoplasms affecting hormone regulation.
Purpose of the Study:
- To investigate the clonal composition of pituitary adenomas.
- To correlate tumor clonality with specific pituitary tumor cell types and clinical presentation.
Main Methods:
- Analysis of X-chromosome gene polymorphisms (hypoxanthine phosphoribosyl transferase and phosphoglycerate kinase) and methylation patterns to determine clonality in female patients.
- Screening of peripheral lymphocyte DNA from 62 female patients undergoing surgery for pituitary adenoma.
- Morphological and immunohistochemical studies of tumor specimens post-surgery.
Main Results:
- Normal pituitary tissue was found to be polyclonal.
- The majority of pituitary adenomas studied, including somatotroph, lactotroph, corticotroph, gonadotroph, and nonsecretory adenomas, were monoclonal.
- Mixed or tumors with interspersed normal tissue showed polyclonal or mixed patterns.
Conclusions:
- Functional and nonsecretory pituitary adenomas predominantly exhibit monoclonal origins.
- Somatic cell mutations likely precede clonal expansion, playing a significant role in pituitary tumorigenesis.
- Clonality analysis provides insights into the cellular origins and development of pituitary tumors.