What the! So why are they putting us through all of the pitfalls and side effects of preventative "therapies" if they don't even know what's working, useless or damaging? No wonder the medical oncologist is so vague. When Tamoxifen caused endometrial thickening and I had to change to Zoladex and Letrozole, my oncologist said, "There's no science to this, it's just guesswork". Another helpful comment from a medical oncology intern: "We treat a hundred to save one".
BCNA, please do something about this issue.