Letrozole - How long is too long?

That’s interesting @Locksley. When I started my second five years’ worth, my oncologist was honest and said that while research indicated 10 years were more effective, he knew of no definitive research as to whether it was cumulative (ie 7 years better than 5, or 9 years better than 7) or not. Just 10 better than 5. So presumably a bit more has been done. All useful. No-one needs to be taking medication longer than is useful.