I’m not exactly answerng the question, but regarding the discussion here, I was recently readong the book Eat to Live and the author gives studies that show communities that eat basically a plant based diet have much fewer cancers. He talks about the mediteranean diet and how everyone thought they should eat olive oil, and he argues it was the vegetables and low amount of animal protein in the diet that really was the protector form heart disease and cancers.
I also have seen studies about the low calorie diets that demonstrate very low rates of disease and longevity.
I also think there are genetic predispositions to cancers, well we have proven there are.
Anyway, I think at least in America even when we think we are doing everything as right as we can, we are often way far off the mark from really being very healthy.