Has there been any research done into cancer preventing supplements that work?

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Hey, So cancer runs in my family and as I'm getting to be older now, I'm starting to try and become more health conscious. It was one thing when I was a kid and I would eat whatever I wanted and not gain weight, but now I'm learning about how certain foods and stuff supposedly can lead to cancer. Fortunately, I've never started smoking, but I was reading about some cancer stats ( http://www.truecancerfacts.com/ ) and it seems like it's fairly common. I've seen things mentioned on TV and of course, when you go to the health food stores there are a ton of products that claim to prevent cancer, but have there been any studies actually substantiating any of these claims? Thanks!