GBM is so very hard to treat because it is so "multiforme"--it varies so between patients and sometimes within the same patient. That is why Avastin works for some, and does nothing for others. That is why temodar works for some, and does nothing for others.
My husband had very late stage disease when he stopped treatment back in November--a large tumor and dissemination into the cerebrospinal fluid (diffuse progression). From everything I read, the leptomeningeal metastases is an "ominous end-stage event".
He was put on decadron, and is still on Keppra and lovenox (for his 3-foot long blood clot). He is still here 4 1/2 months later. It has been a struggle, but he still knows who we are and is not yet bedridden. He sleeps most of the time and has daily headaches, but still has some nice moments with our sons.
Anyway, this disease is very unpredictable and you really don't know how it is all going to play out.
When the quality of life becomes terrible it is a whole different ballgame. My husband's quality of life was worse on treatment. He dropped 30 pounds from his already trim frame from August to November. Since he stopped treatment and started steroids, he has put on alot of weight, but is enjoying food immensely and has a glass of Bailey's Irish cream every night.
Anyway, I am rambling but sometimes stopping treatment is a viable, sensible option--a blessing. Sally