I had a double mastectomy last year and my surgeon told me that the cancer hadn't spread, wasn't in the lymph glands, and that I wouldn't need further treatment. Then the oncology centre contacted me and said I needed to take letrazole because cancer feeds on estrogen. After doing extensive research, I decided that: 1. Our bodies need the estrogen we naturally produce and 2. Exposing myself to the probable very nasty side effects of the letrazole (and its cousins) on the off-chance that there might be a hungry cancer cell floating around somewhere in my body, did not make sense . I also found it interesting that there is NO research to show that estrogen causes cancer. And then the radiology department contacted me and said there was no need for radiation. Now, I'm in my 80's and I can see why a much younger person might feel differently and also not be so susceptible to side effects such as joint pain, etc. Everyone is different, but I'd like to remind people to do their research!