Mass General - the doctor on CNN this afternoon said Senator Kennedy was in the best hospital on the planet.

I know the reputation of it, having grown up in Rhode Island.

They said on the news this evening the usual prognosis for a glioma is 1-5 years survival, but as has been noted, things are improving for cancer treatment all the time.
That's true, but it is so much slower when the cancer is in the brain. As I mentioned above, my father died of a malignant brain tumor in 1945. He lived 18 months after diagnosis. The survival rate is really not significantly better now - 63 years later. I know there are exceptions, but overall the prognosis is terrible.