The best place to to go for info on late stages is the website:
www.brainhospice.com it gives all kinds of symtoms from 6 weeks to 2 to 3 days out from death. Your 2 replys before mine are unusual, I think, from other things I've read. So much depends on location of tumor, whether it has been resected (removed), age, and each individual's unique responses to therapy, etc. There are no hard and fast cases everyone is sooooo different, proving that each and everyone of us is unique just as God has made us.
Some people have said that their patient has jumped all around the Brain hospice timeline as my brother, who I care for, has somewhat, but it's still a great reference and also suggests ways to verbally interact with our loved one that we might not think about otherwise.
Hope this helps,
Caregiver for brother, dx 9/11/07, 4cm. inoperable GBM, EBRT/Temodar, then 5 cycles 5/23 Temodar, tumor always stable according to MRI but he has declined greatly, bedridden since Apr. 14, 2008. Will probably start Avastin-CPT 11 soon.