My grandma had her breast cancer tumor from 4x4cm shrink to non detectable using iodine and
getting her Vitamin D levels up between 60-80 ng/mL.
White button mushrooms can help block estrogen because it competes for estrogen receptor sites.
http://www.ncbi.nlm.nih.gov/pubmed/11739882
The white button mushrooms were clinically study for the same effectiveness as the pharma aromatase inhibitors, such as arimidex.
http://jn.nutrition.org/content/131/12/3288.long
Also, according to Carole Baggerly, breast cancer is a disease of vitamin D deficiency.
I believe that your body can't grow cancer when the D levels are within optimum.
http://articles.mercola.com/sites/articles/archive/2099/12/31/vitamin-d-benef...