Although prognosis varies for each patient, the majority of patients diagnosed with stage 4 glioblastoma live for less than a year, according to Cancer.net. Approximately six percent of patients with stage 4 glioblastoma are still living after five years.
The prognosis varies based on numerous factors, including the patient's age and overall health and the exact location of the tumor, explains Cancer.net. In addition, patients who have the MGMT methylation gene turned off in their tumor cells tend to respond better to treatment and live longer than those who do not. Approximately 30 percent of glioblastoma patients have this gene change.
A grade 4 glioblastoma is very fast-growing. Glioblastomas represent about 17 percent of all brain tumors, according to the American Brain Tumor Association. They are most often be found in one of the brain's cerebral hemispheres, but they can occur anywhere in the brain. Glioblastomas rarely spread to other areas of the body.
Common glioblastoma symptoms include drowsiness, headache, nausea and vomiting, explains the American Brain Tumor Association. These symptoms are a result of increasing pressure on the brain as the tumor grows at a rapid pace. Memory problems, weakness on one side of the body, vision changes and speech issues can also occur.