As I say cancer cells are shifty - technically it's metastasised but not in the grim way! I think letrozole is worth doing but side effects can be an issue - my bone density was terrific for my age when I started but if I end with average for my age (72) I'll be lucky. I have vaginal atrophy - possibly partly age but the exact timing with Femara is deeply suspicious! Also cataracts - in the middle of getting those fixed. And while it can be a side effect, my mother had the same thing at the same age so possibly not. So keep your bone density checks up and yell for help if you have difficulties, no virtue in suffering in silence. Best wishes.