Rochester Mayo In Minnesota has just put in HBO,chamber with high alitude chamber as well, after many years of debate, the old doctors seemed to say no the new doctors say yes.
When I was there there was a number of us with radiation damage to the teeth. Also helps open wounds. The only side affect I had was eye site went wacky but did come back. I also have a freind of mine 14 years survivor Had HBO 10 years ago. Same place I went. I think if there is a live cell in you after radiation, it will come back in time.