Angie
Ask your doctors at Anderson about CyberKnife radiation. I too was told at first that I could have no more radiation to my neck after getting 40 IMRT at the "maximum" of 72GY. It averaged out to a little less than 2 GY a day. So I had the surgery when the cancer came back but the pathology report was so bad, they said it would come back a third time. The CCC radiation team suddenly changed their tune and said CyberKnife. So I went in and got a full 5GY a day for a week for another 25GY. It was not easy, but I am proof that more radiation is possible, just as long as it's not more IMRT.
As my radiologist put it: we need all the help we can get.