Dude, you're a bro and all but you clearly have absolutely no idea about the pathophysiology of the common breast cancers and are well out of your league here.
Type-2 Diabetes Mellitus is certainly something you can get on your diet/exercise/pleasebeaveganlikeme soapbox about, but until you learn about how breast cancers develop please don't make yourself look this stupid again.
Quoting an incredibly tiny "non-profit" (
About Us) which doesn't even list its "board of directors" and takes in around $700k a year in donations primarily by using its content-writer-developed website and EMD makes you look as foolish as the claims you made in your post.
Maybe do a bit more research before you try to get into a topic like this. Here, this should start you off pretty easy:
Estrogen receptor - Wikipedia, the free encyclopedia and you can work your way outwards until you reach inception.