Surgery in these cases is considered palliative even with complete surgical resection of the tumor. There is no cure for this cancer. The median survival is about 1 year; untreated it is about 3 months. There are a few reasons for this. For one the tumor cells are very resistant to chemotherapy and other conventional therapies. The brain is susceptible to damage due to therapy and is limited in its capacity to repair itself. And many drugs cannot cross the blood brain barrier. However, about 1 in every 5,000-6,000 survives for decades. You may want to look at UCLA’s website for more information as they do a lot of research in this area.