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Mutations in human breast cancer: an overview
1Laboratory of Tumor Immunology and Biology, National Cancer Institute, Bethesda, MD 20892.
Journal of the National Cancer Institute
|December 6, 1989
Summary
Multiple gene mutations are involved in breast cancer development. Researchers identified specific genetic alterations in human breast tumors, but their role as prognostic indicators requires further investigation.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Mammary tumorigenesis involves multiple genetic mutations, as evidenced by studies in mice and transgenic models.
- Advancements in molecular biology enable the identification of genetic alterations in human breast tumors.
Purpose of the Study:
- To investigate specific mutations in human breast tumor DNA using a molecular approach.
- To determine if these mutations correlate with clinical parameters and disease prognosis.
Main Methods:
- Utilized recombinant DNA probes to detect proto-oncogenes, growth factor genes, and growth factor receptor genes.
- Analyzed primary human breast tumor DNA for mutations, including gene amplification and loss of heterozygosity.
- Examined restriction fragment length polymorphisms in the human population.
Main Results:
- Identified eight key mutations: amplification of c-myc, c-erbB2, and int-2; loss of heterozygosity on chromosomes 1q, 3p, 11p, 13q, and 17p.
- Loss of heterozygosity may reveal recessive mutations in tumor-suppressor genes.
- Amplification of c-myc, c-erbB2, or int-2 showed association with increased relapse risk or poorer survival in some studies.
Conclusions:
- Specific genetic mutations are frequently observed in human breast tumors.
- The prognostic value of these mutations for breast cancer management remains controversial.
- Further research is necessary to clarify the role of these mutations as prognostic indicators.