GBM, also known as glioblastoma and grade IV astrocytoma, is the most common and most aggressive malignant primary brain tumor. It involves glial cells and accounting for 52% of all brain tissue tumor cases and 20% of all tumors inside the skull. GBM is a rare disease, with a rate of 2–3 cases per 100,000 person life-years in Europe and North America. About 50% of the people diagnosed with GBM die within one year, while 90% within three years.

 

Bron: WIKIPEDIA