Abstract

The effect of diet on cancer formation and prevention of carcinogenesis has attracted considerable attention for years and is the subject of several studies. Some components of the daily diet, such as resveratrol, curcumin, genistein, gingerol, can significantly reduce the risk of cancer or affect the rate of tumor progression. Cancer chemoprevention assumes the use of natural or synthetic biologically active substances in order to prevent, inhibit or reverse the progression of cancer. There are many biologically active compounds in several natural products, i.e. garlic, ginger, soy, curcuma, tomatoes, cruciferous plants or green tea. Their chemopreventive activity is based on the inhibition of processes underlying carcinogenesis (inflammation, transformation and proliferation), but also affects the final phase of carcinogenesis – angiogenesis and metastasis. Despite the relatively low toxicity of chemopreventive agents, their molecular targets often coincide with the objectives of the currently used cancer therapies. The widespread use of chemopreventive agents may contribute to reduction of the rate of cancer incidence, and increase the effectiveness of conventional cancer therapies. In the present study, selected molecular mechanisms of the chemopreventive activity have been discussed, especially their involvement in the regulation of signal transduction, cell cycle regulation, apoptosis, metastasis and angiogenesis. The role of chemopreventive agents in the inflammatory process, the metabolism of xenobiotics and multidrug resistance has been also characterized.

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