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Ben is an old friend of mine. He is a 19 year survivor of a gbm, and has done extensive writing on the subject. The link will bring you to his page where you can see more of his articles as well. This article on long term survivors explores how rare it is to actually survive so long. May be depressing but it shows the need for more research and to be more aggressive in finding treatments.
New Ben Williams article posted on Virtualtrials.com: Long Term Survivors of GBMs