I don't believe it: MMTV causes benign tumors in mice. Attempts to find a breast cancer virus in humans have been going on for decades and have been impressively unsuccessful, with a couple of "independent thinkers" doing all the work and generating a lot of scare stuff. Although they wrote the current "Wikipedia" article, you need to know that most of us do not beileve that avoiding a virus is the key.
Answered 7/22/2016
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