Cause of Breast Cancer: Estrogen Dominance or Microbes?

What really causes breast cancer: estrogen dominance or microbes?

I had this discussion with someone who told me that estrogen dominance causes breast cancer. But based on my reading of the following articles, I have long believed that Breast Cancer or any cancer for that matter is caused by microbes.

http://www.cancertutor.com/Articles/What_Causes_Cancer.html

http://www.cancertutor.com/Articles/Advanced_Cancer_Theory.html

What is your take on this? It seems to be like a "chicken or egg" question. I would really like to understand the relation between estrogen dominance and microbes. Does estrogen dominance happen first and cause microbes to proliferate or is it the other way around? Sorry if this is such a newbie question, I am just trying to learn.

Thanks!
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