Well, to get the parents point of view, looks like the best bet is:
http://prayforkatie.blogspot.com/
I'm pretty sure that I was incorrect in guessing that they were talking about radiation for bone marrow transplant. They are talking about radiation as hopefully a last step to eliminate the cancer.
It also sounds like they doctors have had to get previous CPS/court orders to give the girl blood products without the parents consent. Unfortunately for the parents, this establishes a track record of them endangering their child. My guess is they will lose anything they try and contest at this point. IMO, their only hope is to find a pediatric oncologist who will review their case and testify that she doesn't need radiation.