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A transforming Kirsten ras oncogene in an oral squamous carcinoma
R E Howell1, F S Wong, R G Fenwick
1Department of Oral Biology, Dalhousie University, Halifax, Nova Scotia, Canada.
Abstract:
This investigation has employed the NIH 3T3 cell transfection assay in an effort to detect transforming genes in DNA from squamous carcinomas of the head and neck. Of 11 tumor DNAs tested, 1 DNA sample from a gingival squamous carcinoma was able to produce primary and secondary transformants containing the human K-ras oncogene. This is the first report of an activated ras oncogene derived from a carcinoma of the head and neck. Head and neck cancers may possess activated ras oncogenes more often than is indicated by this study because of the relative inefficiency of transfection assays in detecting large transforming genes such as K-ras.
Insights
Researchers detected the human K-ras oncogene in head and neck cancer DNA using a cell transfection assay. This finding is the first report of an activated ras oncogene in these specific cancers.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Squamous cell carcinomas of the head and neck are a significant group of cancers.
- The role of specific oncogenes, such as ras, in the development of these cancers is an area of ongoing research.
- Identifying activated oncogenes can provide insights into cancer development and potential therapeutic targets.
Purpose of the Study:
- To detect transforming genes, specifically oncogenes, in the DNA of head and neck squamous carcinomas.
- To investigate the presence of activated ras oncogenes in tumor DNA samples from this cancer type.
Main Methods:
- Utilized the NIH 3T3 cell transfection assay to identify transforming genes.
- Analyzed DNA extracted from 11 tumor samples of squamous carcinomas of the head and neck.
- Confirmed the presence of the human K-ras oncogene in successfully transfected cells.
Main Results:
- One DNA sample from a gingival squamous carcinoma yielded primary and secondary transformants.
- These transformants contained the human K-ras oncogene, indicating its activation.
- This represents the first reported instance of an activated ras oncogene in a head and neck carcinoma.
Conclusions:
- Activated ras oncogenes may be present in head and neck cancers more frequently than this study indicates.
- The relative inefficiency of transfection assays for detecting large transforming genes like K-ras might explain the low detection rate.
- Further research with potentially more sensitive methods is warranted to fully assess the prevalence of activated ras oncogenes in head and neck squamous cell carcinomas.