I had a similar prognosis. Since then It is proven in trials that Letrozole has very great benefit in preventing recurrences, this is different of course from overall survival as shown by the on-line tools and needs to be born in mind when using them. I haven't got the report in front of me at the moment but I think the stats. were something like 60% fewer recurrences in the group taking Letrozole. Many women are now advised to take letrozole for longer, dependant on their individual case, as a result of these trials. If you decide to go ahead with Letrozole you will probably have the dexa scan every two years following your base-line scan and may be prescribed a bisphosphonate as well to prevent damage to your bones. I think the general advice, though, is to start Letrozole treatment as soon as possible, Some consultants start women on at it at diagnosis rather than wait until after the op. Please don't think that it is certain you will experience bad side effects, of course some women have done and have ceased the treatment because of it, but there are many women taking it beyond 5 years ( I know several) who have noticed no effects at all. I was a bit stiff when getting up in the mornings but that wore off in about half an hour. My bones were monitored as I describe. At the end of the five years, had I been advised to take it for longer I would have done so. I hope this helps.
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