Studies of animals that receive palliative treatment  orticosteroids  for brain tumors show a survival range post diagnosis of 64 to 307 days.  CogniQ This demonstrates the inability to accurately predict life expectancy in these cases. What is certain is that the survival times significantly increase with surgery, radiotherapy or chemotherapy. Radiation therapy seems to offer the best results, alone or in combination with other treatments. Generally, the more severe the symptoms, the shorter the life expectancy. http://www.supplements4help.com/cogniq/