Jersey,
My diet is similar to yours. Looks like I am in the minority, but I do think diet can make a big difference. Here is a recent scholarly study from UC, Berkeley that finds brocolli has anti-cancer compunds that help advanced breast cancer patients. (One might assume brocolli would help in the fight with other cancers.)
http://www.sciencedaily.com/releases/2008/12/081203092435.htm
It is frustrating when we read conflicting reports. But even if diet does not fight cancer, it sure improves quality of life, which only helps in the battle. I have lost 25 pounds, and feel at least ten years younger!
Bless you all.
Bill in San Diego