My brother in law has been fighting brain cancer for over 16 months now (glioblastoma multiofrme). Individual prognosis depend on your specific condition, but i guess 16 months is a good sign, don't you think?
Get prepared for a long journey, and try keeping your spirits up. Follow your doctor's orders to the letter and have faith. Pray, or meditate or whatever your faith tells you to do, but believe that there is something/someone larger than us that is there to comfort and listen.
He has been having 2 week rounds of oral chemo every 6 weeks, and started drinking MonaVie to help his immune system. i do not know if it was coincidental nor do i endorse any product, but do some research on your own and see if you want to try it. His hemoglobin levels went from 7 to 11 in 4 weeks.