@Lallaby The stats depend on your specific cancer & data as @Romla says. I watched my oncologist do it on her computer the other day. It was our opening discussion about hormone therapy. I'm on the cusp between Tamoxifen & Anastrozole. She even asked me which one I'd prefer! I said you're the expert, I want the one that maximises the duration of the pulse, you decide. She's leaning towards the aromatase inhibitor. I'm dreading it but trying not to as I know there are some people that don't have too many problems.
It's all playing the odds, and is a juggling act between quality and quantity of life. Even when the percentage is low, say 2%, I like to think about it in the human way. That's two people in a hundred. I wouldn't want to get to a point where I was one of those two people and have to look back at a decision I'd made with regret. Still, check back with me when I'm taking the bloody things!!