Reducing-risk factors

Increasing evidence suggests that diets high in foods containing fibre (or fiber) are associated with a reduced risk for cancer, especially cancer of the colon.[11]
A few studies have also shown a reduced risk for cancers of the breast, rectum, oral cavity, pharynx, stomach, and other sites with diets rich in fruits, vegetables and grain products.[12] Numerous studies have found evidence that carotenoids reduce the risk of some cancers. The evidence is particularly strong for lung cancer,[13] even after taking smoking into account. Vitamin C is found in fruits, particularly citrus fruits and juices, and in green vegetables, as well as in some fortified foods. Of a group of epidemiologic studies investigating the role of vitamin C, three-quarters found that vitamin C, or fruit rich in vitamin C, provides significant protection.[14]
A leaner diet is believed to lower cancer risk. Tomatoes, calcium, agaricus blazei mushrooms[1], other minerals, saponins, sausage tree, sea mat, cat's claw, and licorice are believed to prevent or suppress different kinds of cancerous tumors.[citation needed] Currently there is not enough evidence for using mushrooms or mushroom extracts in the treatment of cancer, but there is significant potential for research in the area and future clinical trials, due to the numerous scientific studies which have shown they may offer a beneficial effect.[15]