If you live a healthy live then you will minimize your risk. This is not a disease that is necessarily caused by some unobserved agent either. I think that the organ is simply the most vulnerable part of the body to any biological insult. So minimize such insults and that is the central message here.
I will add one extra bit of advice. a chip slice of natural ginseng will recenter your hormone system and naturally counteract the effects of Menopause. It is likely beneficial well beyond this. I just know that my wife completely eliminated all such effects thereby and certainly knew it when she went off the ginseng.
I also suspect that the hormone centering effect will be efficacious at preventing breast cancer as well but zero work will have been done there.