Tomatoes contain a chemical called lycopene.
This is found in all forms of tomatoes and tomato products including
fresh, tinned, paste, juice and ketchup. Lycopene is a powerful
antioxidant and mops up free radicals that could damage DNA.It is unclear if lycopene could actually reduce the risk of prostate cancer. A large study of 47,000 men found that eating 2-4 weekly servings of tomatoes reduced prostate cancer risk by a quarter. And the EPIC study found that people who have the highest levels of lycopene in their blood have lower risk of advanced types of prostate cancer, but no decreased risk of developing prostate cancer overall.
However, not all studies agree and there are questions still to answer. For example, we still don't know how large a dose of lycopene you would need to reduce the risk of cancer. Even so, eating lots of tomatoes can help you get your recommended five portions of fruit and vegetables a day. They are also an excellent source of vitamins A, C and E.
source
http://www.cancerresearchuk.org/about-cancer/causes-of-cancer/diet-and-cancer/
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