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Viruses, oncogenes, and cancer
1Laboratory of Cellular and Molecular Biology, National Cancer Institute, Bethesda, MD 20892.
Cancer Detection and Prevention
|January 1, 1988
Summary
Normal cells contain proto-oncogenes that can become oncogenes, driving cellular transformation and tumor development. Understanding oncogene activation is key to advancing cancer diagnosis and therapy.
Area of Science:
- Molecular Biology
- Oncology
- Genetics
Background:
- Normal cells possess proto-oncogenes crucial for growth and development.
- Proto-oncogenes can transform into oncogenes through activation or amplification, leading to cellular changes.
- Cellular oncogenes are conserved across species and identified through retroviral gene homology and transfection assays.
Purpose of the Study:
- To explore the role of proto-oncogenes and oncogenes in cellular transformation and carcinogenesis.
- To investigate the mechanisms of oncogene activation and their association with tumor development.
- To highlight the potential of oncogene research in improving cancer diagnosis and therapy.
Main Methods:
- Identification of cellular oncogenes via homology to viral transforming genes.
- Transfection assays using tumor cell DNA to detect transforming activity.
- In vitro experimental evidence to support multistep carcinogenesis models.
Main Results:
- Over two dozen cellular oncogenes identified, exhibiting conserved properties.
- Proto-oncogene expression linked to normal development; oncogene expression linked to tumors.
- Evidence supports a multistep process in human cell carcinogenesis, involving activated oncogenes like met and H-ras.
Conclusions:
- Oncogene activation, mutation, or amplification is associated with tumor formation.
- Cooperation between multiple oncogenes may be essential for oncogenesis.
- Advances in oncogene molecular biology promise improved cancer diagnostics and therapeutics.