I've not yet heard of someone offered radiation OR aromatase inhibitors. In theory these are both valid treatment protocols, as is chemo when it's appropriate. Depending upon the risk of recurrence that your oncologist thinks applies in your situation, the Letrozole may be a good idea to at least try. Even better, a second opinion from another oncologist might be helpful with that decision also. I declined aromatase inhibitors for a few reasons specific to my health but it was reassuring that two oncologists supported that decision and didn't see it as risky.