Re plant phtyo estrogens impact etc.
Please find below some links which may help in your decision process.
Plants are very complex chemical arsenals, and appear to work in very many ways, so simple answers are not likely. It will I guess often be a balance of positive and possible negatives. I do beleive the omega three six balance is fundamental it causes changes of expression of all sorts of thing that appear to have a wider linkage to enabling cancer to function. As it takes years for many cancers to develop if diet is the cause it would no be reaonalbe to expect miracles over night. Breast tissue fat shows change in three months adipose tissue three years according to reports I have seen.
Overall my simplistic outlook is there is a certain comfort in knowing that we have eaten things for thousands of years, and that the vast increases in cancers is relatively recent, so whole food intake is unlikely to be the cause - it is when it is taken in processed form that a great deal of care has to be taken as any effect it has will be magnified by quantity and easy availability eg omega six.
But as usual there are no easy answers. Trials will only be done when governements decide to fund preventative research of dietary factors at sufficent scale to produce more definative answers on economic grounds. In the mean while people may be suffering unecessarily. Drugs companies will not do preventitate research based on food - billions to be saved not made here!.
There seems to be lots more information so try searching NCBI, Annieappleseed, google etc. if you need more reassurance.
I hope this helps, but as usual you have to check it out for your self.
FLAX
http://www.flaxhealth.com/breastcancer.htm
http://www.cancerrd.com/faqs/faq77.htm
http://annieappleseedproject.org/flaxeninefof.html
SOY
http://www.vegetariannutrition.net/v...st_cancer.html