Abstract
Oral cancer is an aggressive and rapidly progressive disease. The oral cavity is home to over 700 species of microorganisms which regulate metabolism, immune function and health. There are 3 types of mechanisms by which bacteria may participate in carcinogenesis. First, bacteria cause chronic inflammation, which stimulates the production of cytokines, including interleukins, interferons, and tumor necrosis factor. Second, bacteria can interact directly with host cells by secreting toxins or by binding to membrane receptors. Finally, the production of metabolites by bacteria may also contribute to carcinogenesis. The importance of bacteria level and composition in the transition of oral precancerous lesions to cancer has been demonstrated. The relationship of changes in microbiome composition with smoking, inflammation in healthy individuals, as well as with the development of oral cancer in patients has been studied.
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