I am going through a similar situation right now. However, after three PSMAs, the cancer is undetectable at 3.84 PSA. I am currently under no treatment. I have asked the same question to my urologist and my radiation oncologist. My answer was, if the cancer is within the prostate bed, then radiation there again is not possible because of likelihood of damage to other organs. It it is located outside the bed, then it is possible to have radiation administered.