After much discussion with a radiation oncolgist it was decided the difference the radiation would make in my chances of recurrence did not warrant the side effects that the treament would cause me. So no radiation for me, but somedays I wish I had taken it, just in case!
I think sometimes we think the Doctors make these decisions randomly (or at least it seems like they do) but they look very closely at each individual case and decide what is best for each person. In my case I made them all sit down (surgical and radiation people) and go over my stuff just one more time, so I would feel more confident with the decision.