Much of the evidence about cruciferous vegetables and their protective effects against different types of cancer focuses on the unusual phytochemical known as glucosinolates; in particular on the hydrolysis products, the isothiocyanates. These compounds are found in cruciferous vegetables and studies have shown that they:
"These vegetables contain compounds called isothiocyanates which we believe to be responsible for the cancer-preventive and anti-carcinogenic activities in these vegetables. Broccoli and broccoli sprouts have the highest amount of the isothiocyanates.
"Our paper focuses on the anti-cancer activity of one of these compounds, called sulforaphane, or SFN,
Previous studies have shown that cruciferous vegetables prevent all sorts of cancer. One study of 1000 men revealed that men who consumed 3 or more servings of cruciferous vegetables per week had a 41 percent reduced risk of prostate cancer compared to those that consumed only one or less a week. 
Other studies have revealed how this compound works to provide chemoprotective effects against cancer on a genetic level by activating some genes that fight cancer and switch off others that fuel tumors.
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