Oral squamous cell carcinoma: new insights.

Squamous cell carcinoma is the most common form of oral cancer, and causes more deaths than any other oral disease. Dentists and dental auxiliaries must know the clinical, etiologic, pathogenetic and prognostic features of squamous cell carcinoma to ensure appropriate screening and diagnosis of the patient. It is now recognized that cancers are genetic diseases, which arise from inherited genetic factors and exposure to exogenous carcinogens that alter the DNA of cells. Increasingly, the genetic events that contribute to the development of cancers at many sites within the body are being identified, and the complex series of genetic steps required for fully-developed neoplasia to arise in the oral cavity are being better characterized. This article reviews recent advances in the understanding of the etiology and pathogenesis of oral carcinoma, including the involvement of various oncogenes, tumor suppressor genes and viruses.