survival rates at 10 years for stage 1b or 2a breast cancer grade 1
I have not heard that Grade 1 is more likely to return, and it certainly seems counter-intuitive, since that means the cells are well-differentiated and much more closely resemble normal cells than, say, Grade 3, which is highly aggressive and typically where one worries more about potential spread or recurrence.
But if what you say is true, and if it would be likely to be the same low-grade cells in a new primary tumor, then you have already substantially reduced that risk d/t your BLM. Distant mets are more common when there has been lymph node involvement (you didn't comment on that aspect of your case), but the hope would be that chemo helped reduce that risk.
I don't think anyone who has ever had cancer is free of worry, but when it flares up, keep in mind that you had a type of BC with a favorable prognosis, you have treated it aggressively (BLM and chemo, and now Arimidex), and will no doubt maintain close surveillance. You have done all you could do, and the rest is up to God, or fate (depending on your beliefs), so try to concentrate on enjoying the rest of your life.
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