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Karina,
Your remark about the change in cancer incidence in Japanese who emigrate to north America as related to diet, not genetics, is quite right . Even if these emigrants keep their traditional diet they may still be unwillingly prone to cancer due to differences in the quality of some foods.
For instance I already mentioned in an other post a comment by Dr M.J. Folkman in a lecture where he briefly discussed the variations of incidence related to soybean based food consumption.
He said that soybean grown in north America lacks the genetic make up for genestein while soybean grown in Japan includes genestein which is considered as a cancer preventative food.
So epidemiology studies show that those emigrants consumming imported soybeans are better off than those eating the local grown variety.
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