Skip to content

    Brain Cancer Health Center

    Font Size

    What Is Glioblastoma?

    If you’ve been diagnosed with glioblastoma, there are treatments to help you live better and ease your symptoms.

    Read on to learn more about brain cancer, so you can take action to get the best care.

    Recommended Related to Brain Cancer

    Brain Tumors in Adults

    No one knows what causes brain tumors; there are only a few known risk factors that have been established by research. Children who receive radiation to the head have a higher risk of developing a brain tumor as adults, as do people who have certain rare genetic conditions such as neurofibromatosis or Li-Fraumeni syndrome. But those cases represent a fraction of the approximately 35,000 new primary brain tumors diagnosed each year. Age is also a risk factor -- people over the age of 65 are diagnosed...

    Read the Brain Tumors in Adults article > >

    Where It Forms in the Brain

    Glioblastoma is a type of astrocytoma, a cancer that forms from star-shaped cells in the brain called astrocytes. In adults, this cancer usually starts in the cerebrum, the largest part of your brain.

    How Common Is It?

    Almost 1 in 5 tumors that start in the brain are glioblastomas. Men are more likely to get them than women. And chances go up with age.

    How Serious Is It?

    Glioblastoma tumors are usually highly malignant, or cancerous. These are grade 4 tumors, which means they can grow fast and spread quickly.

    Glioblastoma tumors make their own blood supply, which helps them grow. It's easy for them to invade normal brain tissue.


    Because glioblastomas grow quickly, pressure on the brain usually causes the first symptoms. Depending on where the tumor is, it can cause:

    How Tumors Become Glioblastoma

    There are two types:

    • Primary glioblastoma is the most common. It starts out as a grade 4 tumor and is very aggressive.
    • Secondary glioblastoma starts as a grade 2 or 3 tumor, which grow slower. Then it becomes grade 4. About 10% of glioblastomas are this type. They tend to happen when you're 45 or younger.

    Diagnosing Glioblastoma

    A neurologist, a doctor who specializes in diagnosing and treating brain disorders, will give you a complete exam. It may include an MRI or CT scan and other tests, depending on your symptoms.


    The goal of glioblastoma treatment is to slow and control tumor growth and improve your quality of life. There are 4 treatments available often in combination:

    • Surgery is the first treatment. The surgeon tries to remove as much of the tumor as possible. In high-risk areas of the brain, the surgeon may not be able to remove all of a tumor.
    • Radiation is used to kill as many leftover tumor cells as possible after surgery. It can also slow the growth of tumors that can't be removed by surgery.
    • Chemotherapy may also be used. Temozolomide is the most common chemotherapy drug used for glioblastoma. Chemotherapy can cause short-term side effects, but it is much less toxic than it used to be.

    Today on WebMD

    doctor and patient
    How to know when it’s time for home care
    doctory with x-ray
    Here are 10 to know.
    sauteed cherry tomatoes
    Fight cancer one plate at a time.
    Lung cancer xray
    See it in pictures, plus read the facts.
    Malignant Gliomas
    Pets Improve Your Health
    Headache Emergencies
    life after a brain tumor

    Would you consider trying alternative or complementary therapies?