@mayblin I had all the genetic tests, not just BRCA, and they were all negative. As I wrote 80% of breast cancers are fed by hormones. My treatment was with an aromatase inhibitor that reduces estrogen below detectable levels. The adrenal glands make estrogen after menopause and the AI's address that source.

As for why anyone gets cancer, who knows, given the challenges in our environment. My grandmothers, cousins and aunts have had it but not mother or sister. They can't possibly test for all genes so...again, who knows!

The risk goes up with age. That statistic of one in eight is often challenged by people saying it is skewed because older women were included in a larger proportion. I have not seen the study so I cannot comment. I was 63.