About 2nd Time Radiation With Pulse Reduced Dose Rate Radiation?

My boyfriend has a astrocytomis grade three. He had radiation before and has done chemo and brain surgery.. it is still growing. His last option we found out today is Pulse Reduced Dose Rate Radiation. Radiation for the second time. There is no stronger chemo and surgery is now out of the question. I was wondering if anyone out there has had the same experience and can give me some advice. thank you so much