Dan,
I suggest you seriously considering doing radiation with chemo. The chemo boosts the effects of the RAD. Blast it with everything you can this time, so there won't be another! My daughter had RAD without chemo (on the doctor's advice) and she didn't make it.
I'm surprised RAD wasn't recommended the first time. It is unusual for stage 3 to be treated with surgery only. Have you sought a second opinion? And are you being treated at a major cancer center?
Rainbows & hugs,
Rosie