Glioblastoma multiforme

This is so bizarre that I have not slept in 2 days. My husband was diaganosed with a glioblastoma multiforme in January that is in the shape of a butterfly across his left and right frontal lobes and crossing the corpus crossum {sp}. He had 31 days radiation, and round of temador. Dr's said he had 3-6 months to live. He actually at one point could not lift himself, bath and was wheelchair bound. 5 days ago he suddenly was walking, showering, and even lifting himself with no help. The tumor has not reduced in size and he still take 8mgs of decadron and keppra. Has anyone ever seen this happen? And why does it happen? His tumor did not change so why did he suddenly? Is there suddendly more hope? Help, I am so confused.