Jenn, if you talked to an oncologist at a CCC, I think this is an opinion you can trust. Was this a radiation oncologist?
It's more or less true radiation is a "one time deal" although the RO at Dana Farber I saw for my second opinion said that re-irradiaiton can be done without much damage after (15? 16? 18? 20?-somewhere in there -I am forgetting the exact number he gave) years (which I found interesting, that's the only place I've heard that). But the idea is, if you have tyhe radiation, hopefully you have lowered your chances of having a recurrence substantially so you won't NEED it again. There's clear data that indicates that the odds of treating a recurrence successfully with rad are much lower than the odds of treating it successfully the first time. But its hard to figure out what those odds mean for an individual decision since by definition if you get a recurrence you may have a more aggressive kind of cancer than the people who don't get one.
Again, if you saw a radiation oncologist at a CCC, I'm sure this recommendtion that you got is a good one.
Nelie