Cancer preventive effects of flavonoids--a review.
A cancer protective effect from plant-derived foods has been found with uncommon consistency in epidemiologic studies. However, it has been difficult to identify specific components responsible for this effect. Many phytochemicals have been shown to be biologically active and they may interact to protect against cancer. In recent years, experimental studies have provided growing evidence for the beneficial action of flavonoids on multiple cancer-related biological pathways (carcinogen bioactivation, cell-signaling, cell cycle regulation, angiogenesis, oxidative stress, inflammation). Although the epidemiologic data on flavonoids and cancer are still limited and conflicting, some protective associations have been suggested for flavonoid-rich foods (soy and premenopausal breast cancer; green tea and stomach cancer; onion and lung cancer). This review focuses on the biological effects of the main flavonoids, as well as the epidemiologic evidence that support their potential cancer protective properties.
Le Marchand
Loïc
L
Epidemiology Section, Cancer Research Center of Hawaii, University of Hawaii, Honolulu 96813, USA.
D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology / Q000627:therapeutic use*; D002273:Carcinogens / Q000037:antagonists & inhibitors / Q000378:metabolism; D005419:Flavonoids / Q000494:pharmacology / Q000627:therapeutic use*; D006801:Humans; D009369:Neoplasms / Q000178:diet therapy* / Q000517:prevention & control*; D013025:Glycine max; D013662:Tea
D000972:Antineoplastic Agents, Phytogenic; D002273:Carcinogens; D005419:Flavonoids; D013662:Tea