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Genetic alterations in head and neck squamous cell carcinomas
1Departamento de Radiologia, Faculdade de Medicina, Universidade de São Paulo, Brasil. nagai@usp.br
Abstract:
The genetic alterations observed in head and neck cancer are mainly due to oncogene activation (gain of function mutations) and tumor suppressor gene inactivation (loss of function mutations), leading to deregulation of cell proliferation and death. These genetic alterations include gene amplification and overexpression of oncogenes such as myc, erbB-2, EGFR and cyclinD1 and mutations, deletions and hypermethylation leading to p16 and TP53 tumor suppressor gene inactivation. In addition, loss of heterozygosity in several chromosomal regions is frequently observed, suggesting that other tumor suppressor genes not yet identified could be involved in the tumorigenic process of head and neck cancers. The exact temporal sequence of the genetic alterations during head and neck squamous cell carcinoma (HNSCC) development and progression has not yet been defined and their diagnostic or prognostic significance is controversial. Advances in the understanding of the molecular basis of head and neck cancer should help in the identification of new markers that could be used for the diagnosis, prognosis and treatment of the disease.
Insights
Genetic alterations in head and neck cancer involve oncogene activation and tumor suppressor gene inactivation. Understanding these changes is key to identifying new diagnostic and prognostic markers for head and neck squamous cell carcinoma.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Head and neck cancers are characterized by genetic alterations, including oncogene activation and tumor suppressor gene inactivation.
- Key genes involved are MYC, ERBB-2, EGFR, CyclinD1, p16, and TP53.
- Loss of heterozygosity suggests involvement of unidentified tumor suppressor genes.
Purpose of the Study:
- To review the genetic alterations in head and neck cancer.
- To highlight the role of oncogenes and tumor suppressor genes.
- To emphasize the need for further research into genetic alterations for diagnostic and prognostic markers.
Main Methods:
- Review of genetic alterations in head and neck cancer.
- Analysis of oncogene and tumor suppressor gene mutations, amplifications, and epigenetic modifications.
- Examination of loss of heterozygosity patterns.
Main Results:
- Genetic alterations include oncogene amplification/overexpression (MYC, ERBB-2, EGFR, CyclinD1) and tumor suppressor gene inactivation (p16, TP53) via mutations, deletions, or hypermethylation.
- Frequent loss of heterozygosity indicates potential roles for other tumor suppressor genes.
- The precise sequence and significance of these alterations in head and neck squamous cell carcinoma (HNSCC) development remain unclear.
Conclusions:
- Genetic alterations are central to head and neck cancer development.
- Further understanding of molecular basis is crucial for identifying novel diagnostic, prognostic, and therapeutic markers.
- Research is needed to define the temporal sequence and clinical significance of genetic alterations in HNSCC.