What is glioblastoma Its causes symptoms and treatment

Glioblastoma, also known as glioblastoma multiforme, is one of the most aggressive and dangerous brain tumors. It is characterized by rapid growth and the ability to infiltrate surrounding brain tissue. This tumor originates from glial cells, which normally play a crucial role in supporting and protecting neurons, but in some cases, these cells transform into malignant tumors that are difficult to control without urgent and comprehensive medical intervention.Despite significant advancements in neurosurgery, radiation therapy, and chemotherapy, glioblastoma remains a major medical challenge due to its complex nature and tendency to recur even after treatment. Therefore, raising awareness about its potential causes, early symptoms, and modern diagnostic methods is essential. Equally important is understanding the latest therapeutic strategies aimed at improving patient quality of life and extending survival. we provide a comprehensive overview of glioblastoma, covering its definition, causes, symptoms, diagnostic approaches, and treatment options, while also addressing the most frequently asked questions about this critical condition.

What is Glioblastoma?

Glioblastoma is one of the most aggressive types of brain cancer. It is classified as a tumor of the central nervous system, which can affect the brain or the spinal cord. This tumor is known for its extremely rapid growth and its ability to invade nearby brain tissue in a highly aggressive manner, making it one of the most difficult brain tumors to treat.

Glioblastoma develops from astrocytes, which are star-shaped supportive cells that surround nerve cells and help protect and nourish them. When certain genetic mutations occur, these cells can transform into cancerous cells that grow uncontrollably.

One of the dangerous features of this tumor is its ability to create its own network of blood vessels, allowing it to sustain rapid growth and infiltrate normal brain tissue. It is also called Glioblastoma Multiforme (GBM) because of the varied appearance of its cells under the microscope.

Although it is highly aggressive, glioblastoma rarely spreads outside the central nervous system to other parts of the body.

Can Glioblastoma Be Cured?

Currently, there is no definitive cure for glioblastoma. The tumor has a strong tendency to recur even after surgery, radiation therapy, and chemotherapy.

Current treatments mainly focus on:

Slowing the growth of the tumor
Reducing the size of the cancerous mass
Relieving symptoms such as headaches or seizures
Improving quality of life and extending survival as much as possible

Life Expectancy After Diagnosis

The average survival time after diagnosis is about 12 to 15 months with comprehensive treatment that includes surgery, radiation therapy, and chemotherapy.

However, survival time varies from person to person depending on several factors, including:

The patient’s age
Overall health condition
Tumor location and size
Whether the tumor can be surgically removed
The presence of certain genetic mutations that may influence treatment response

Some patients may live longer than the average if they respond well to treatment.

Is Glioblastoma Contagious or Hereditary?

Glioblastoma is not contagious and cannot be transmitted from one person to another in any way.

From a genetic perspective, most cases occur sporadically, without a clear family history. However, in rare situations, certain inherited genetic syndromes may increase the risk of developing this tumor.

Stages of Glioblastoma

Glioblastoma differs from many other cancers because it is not classified into traditional stages (Stage I–IV) like breast or lung cancer. This is because it rarely spreads outside the central nervous system.

Instead, it is classified based on the tumor grade, which reflects how aggressive and fast-growing the tumor is, according to the World Health Organization (WHO) classification system.

1. Secondary Glioblastoma

In some cases, glioblastoma does not appear suddenly but develops gradually from lower-grade gliomas known as astrocytomas.

This progression typically occurs through the following stages:

Low-grade astrocytoma (Grade II):
Relatively slow growth, and mild symptoms that may last for years.

Anaplastic astrocytoma (Grade III):
Faster growth with more noticeable neurological symptoms.

Glioblastoma (Grade IV):
The most aggressive stage, where the tumor spreads rapidly and invades nearby brain tissue.

Secondary glioblastoma is more commonly seen in younger patients compared with the primary form.

2. Primary Glioblastoma

This is the most common form of glioblastoma. It appears suddenly without a previously existing low-grade tumor.

It usually affects older adults and is immediately classified as Grade IV under the WHO classification.

This type is characterized by:

Extremely rapid growth
Strong ability to invade surrounding brain tissue
Neurological symptoms that develop over a relatively short period

WHO Grading System for Brain Tumors

The World Health Organization classifies brain tumors into four main grades:

Grade I:
Usually benign tumors that grow slowly and rarely spread.

Grade II:
Low-grade tumors that grow slowly but may become more aggressive over time.

Grade III:
Malignant tumors that grow faster and require intensive treatment.

Grade IV:
Highly aggressive tumors with rapid growth. Glioblastoma is the most well-known example of this grade.

Important note:
Glioblastoma is always classified as Grade IV, which is why it is not divided into traditional stages like other cancers.

Doctors evaluate the condition based on:

The tumor grade and aggressiveness
Tumor size and location in the brain
The extent of infiltration into surrounding tissue
Genetic mutations that may influence treatment options

Causes of Glioblastoma

Glioblastoma (Glioblastoma Multiforme – GBM) is one of the most aggressive brain tumors. It originates from glial cells, which are responsible for supporting and protecting nerve cells.

Despite significant medical research, there is still no single confirmed cause of this disease. However, several genetic and environmental factors may increase the risk.

1. Genetic Factors

Genetic mutations play a key role in the development of glioblastoma. These mutations disrupt the normal control of cell division, leading to uncontrolled growth.

Some of the most important mutations include:

EGFR:
Overactivation of this gene can stimulate excessive growth of cancer cells.

TP53:
A malfunction in this gene prevents the body from stopping damaged cells from dividing.

PTEN:
Loss of its function is strongly associated with the development of high-grade brain tumors.

In rare cases, inherited genetic syndromes may increase the risk, including:

Li-Fraumeni syndrome
Turcot syndrome
Neurofibromatosis type 1 or type 2 (NF1 / NF2)

2. Radiation Exposure

Exposure to high levels of ionizing radiation, especially to the head, is one of the known risk factors.

This may occur due to:

Previous radiation therapy for other cancers
Accidental exposure to strong radiation sources

3. Possible Environmental Factors

Research in this area is still ongoing. Some studies suggest a possible link with:

Long-term exposure to industrial chemicals
Organic solvents and certain carcinogens
Severe environmental pollution

However, there is no definitive scientific evidence confirming a direct relationship between lifestyle and glioblastoma.

4. Age and Gender

Glioblastoma is most commonly diagnosed in adults between 45 and 70 years old.

It occurs slightly more often in men than in women.

Types of Glioblastoma

Glioblastoma can be classified in several ways depending on its origin, genetic mutations, and biological behavior.

1. Classic Glioblastoma

Represents about 90% of cases
Typically affects older adults
Often associated with EGFR gene amplification
Usually does not contain an IDH mutation

2. Primary and Secondary Glioblastoma

Primary Glioblastoma

Appears suddenly without a previous low-grade tumor
The most common form
Usually affects older adults

Secondary Glioblastoma

Develops gradually from lower-grade gliomas such as astrocytoma
More common in younger patients
Often associated with IDH1 or IDH2 mutations and TP53 mutations

3. Glioblastoma Multiforme

This is the classic pathological form of the disease, characterized by:

Highly heterogeneous cellular structure
Areas of necrosis (cell death) and internal bleeding
Strong ability to rapidly invade surrounding brain tissue

4. Modern Molecular Classification (Molecular Subtypes)

With advances in molecular medicine, glioblastoma has been divided into several molecular subtypes to help guide targeted therapies more precisely:

Classical subtype: Associated with increased activity of the EGFR gene.
Proneural subtype: Often linked to mutations in IDH and PDGFRA genes.
Mesenchymal subtype: Associated with NF1 mutations and is often more aggressive.
Neural subtype: Linked to genes that resemble those found in normal nerve cells.

Symptoms of Glioblastoma

The symptoms of glioblastoma vary depending on the tumor’s size, location in the brain, and rate of growth. Because of its aggressive nature, symptoms often develop rapidly compared to other brain tumors.

In general, symptoms can be divided into two main categories:

Symptoms caused by increased pressure inside the skull
Neurological symptoms related to the tumor's location in the brain

1. Symptoms Caused by Increased Intracranial Pressure

As the tumor grows, pressure inside the skull increases, leading to several general symptoms, including:

Persistent or worsening headaches, especially early in the morning or during coughing and sneezing
Recurrent nausea and vomiting without a clear cause
Difficulty concentrating and reduced attention
Memory problems or slower thinking
General confusion or changes in the level of consciousness in advanced stages

2. Neurological Symptoms Based on Tumor Location

Neurological symptoms vary depending on the affected brain lobe.

Frontal Lobe

Noticeable changes in personality or behavior
Difficulty planning and making decisions
Weakness or partial paralysis in one limb

Temporal Lobe

Difficulty speaking or understanding language
Memory problems
Recurrent seizures

Parietal Lobe

Loss or reduction of sensation in part of the body
Difficulty coordinating movements or understanding spatial directions

Occipital Lobe

Vision problems such as blurred vision or loss of part of the visual field

Cerebellum or Brainstem

Loss of balance and difficulty walking
Severe dizziness
Problems with speaking or swallowing

3. Seizures

Seizures are a common symptom of glioblastoma. Studies suggest that 30–40% of patients may experience partial or generalized seizures, especially during the early stages of the disease.

When Should You See a Doctor?

Immediate medical evaluation is recommended if the following symptoms appear:

A new and persistent headache that keeps worsening
A first-time seizure
Sudden weakness in one limb
Sudden problems with speech or vision

Diagnosis of Glioblastoma

Diagnosing glioblastoma is a precise and critical process due to the tumor’s aggressive nature and rapid progression. Doctors rely on a combination of clinical examinations, imaging tests, and laboratory analysis to confirm the diagnosis and quickly determine the appropriate treatment plan.

1. Medical History and Neurological Examination

The diagnostic process usually begins with a detailed medical history, where the doctor asks about symptoms such as:

Persistent or worsening headaches
Nausea and vomiting
Vision or speech disturbances
Limb weakness
Changes in personality or behavior

A comprehensive neurological examination is then performed to evaluate:

Muscle strength and reflexes
Sensation and balance
Coordination
Cognitive abilities, memory, and concentration

This assessment helps determine the area of the brain that may be affected.

2. Medical Imaging

Imaging tests are the cornerstone of glioblastoma diagnosis.

MRI (Magnetic Resonance Imaging)

MRI is the most accurate and important imaging test because it:

Determines the exact size and location of the tumor
Shows how far the tumor cells have spread within brain tissue
Often uses a contrast dye to better define tumor boundaries

CT Scan (Computed Tomography)

CT scans are used in certain situations, such as:

When MRI is not available
In emergency situations
To detect bleeding within the tumor

CT scans provide a quick overview of the tumor mass and its impact on surrounding brain tissue.

3. Biopsy

A biopsy is the most important step for confirming the diagnosis.

During this procedure, a small sample of tumor tissue is taken surgically or using image-guided techniques. The tissue is then examined under a microscope to determine:

The exact type of tumor
Its grade according to the WHO classification (Grade IV for glioblastoma)

A molecular analysis may also be performed to identify genetic mutations such as:

IDH
EGFR
TP53

These tests help doctors choose the most appropriate treatment and predict how the tumor may respond to therapy.

4. Additional Tests (When Needed)

In some cases, additional tests may be requested, including:

PET Scan (Positron Emission Tomography):
Used to evaluate the metabolic activity of the tumor and determine its aggressiveness.

Cerebrospinal Fluid Analysis (CSF):
Performed if there is suspicion that cancer cells have spread within the central nervous system.

Importance of Early Diagnosis

Early detection of glioblastoma allows doctors to start surgery, radiation therapy, and chemotherapy as soon as possible. This may help slow disease progression and improve the patient's quality of life.

Drug Treatment for Glioblastoma

Medication therapy is an essential part of the comprehensive treatment plan for glioblastoma, along with surgery and radiation therapy. The goal of drug treatment is to slow tumor growth, reduce the risk of recurrence, and control associated symptoms.

1. Chemotherapy

Temozolomide (TMZ)

Temozolomide is the standard chemotherapy drug used worldwide in the treatment of glioblastoma after surgery.

Its advantages include:

Usually taken orally
Works by damaging the DNA of cancer cells, preventing them from dividing
Often used together with radiation therapy in a combined treatment protocol
Continued after radiation as adjuvant therapy for several cycles

Second-Line Chemotherapy (If the Tumor Recurs)

If the tumor returns or does not respond to initial treatment, doctors may use other medications such as:

Bevacizumab:
Targets VEGF (vascular endothelial growth factor) and reduces the formation of blood vessels that feed the tumor.

Carmustine (BCNU) or Lomustine (CCNU):
Sometimes used to help control recurrent tumors.

2. Targeted Therapy

Targeted therapy focuses on specific genetic mutations within tumor cells, which increases treatment precision and reduces damage to healthy cells.

Examples include:

Targeted drugs against EGFR if the gene is overactive
Bevacizumab when VEGF activity is high to limit tumor blood supply

However, targeted therapy is not suitable for all patients, as it depends on the tumor’s molecular characteristics.

3. Supportive Medications

In addition to treating the tumor itself, doctors often prescribe medications to improve the patient’s quality of life.

Anticonvulsants:
Used for patients experiencing seizures.

Steroids (such as Dexamethasone):
Help reduce brain swelling and intracranial pressure, relieving headaches and neurological symptoms.

Pain relievers:
Used to control headaches or nerve-related pain when needed.

Important note:
Drug therapy alone does not cure glioblastoma, but it can:

Slow disease progression
Delay tumor recurrence
Improve symptoms and quality of life

Treatment decisions depend on the patient’s age, general health, and the tumor’s genetic profile.

Surgical Treatment for Glioblastoma

Glioblastoma is one of the most dangerous brain tumors and is classified as Grade IV, characterized by rapid growth and its ability to infiltrate brain tissue.

Surgery is usually the first and most important step in treatment, followed by radiation therapy and chemotherapy.

1. Gross Total Resection

The goal is to remove as much of the visible tumor as possible based on MRI imaging.

Benefits include:

Maximizing tumor removal
Reducing pressure on brain tissue
Improving response to radiation and chemotherapy
Potentially extending survival time

However, complete removal may be difficult if the tumor is located near critical brain areas responsible for speech, movement, or vision.

2. Subtotal Resection

If the tumor is close to highly sensitive brain regions, surgeons may remove only part of the tumor to avoid severe neurological complications.

The goals are:

Reducing intracranial pressure
Relieving symptoms such as headaches or limb weakness
Preserving neurological function

Even though the tumor is not completely removed, this procedure helps prepare the patient for further treatment.

3. Stereotactic Biopsy

If the tumor is located deep in the brain or is difficult to access surgically, doctors may take only a small tissue sample.

The purpose of the biopsy is to:

Confirm the diagnosis
Determine the tumor grade
Perform genetic testing for mutations such as IDH and EGFR
Help select the appropriate treatment plan

This procedure carries less risk than open surgery but does not remove the tumor.

4. MRI-Guided Surgery

In some advanced medical centers, surgeons use intraoperative MRI to identify tumor boundaries during surgery.

Benefits include:

Increasing the amount of tumor removed
Reducing damage to healthy brain tissue
Lowering the chance of leaving residual tumor cells

5. Fluorescence-Guided Surgery

In this technique, the patient receives a substance such as 5-ALA before surgery.

How it works:

Cancer cells absorb the substance
They glow pink under a special light during surgery
This helps surgeons identify and remove tumor cells more precisely

This method improves the chances of removing as much tumor tissue as possible while protecting healthy brain tissue.

Can Surgery Completely Cure Glioblastoma?

Unfortunately, because glioblastoma spreads into surrounding brain tissue, surgery alone rarely provides a complete cure.

Therefore, it is usually combined with:

Radiation therapy
Chemotherapy (such as Temozolomide)
Sometimes targeted therapy

The goal of surgical treatment is to control the disease, improve quality of life, and extend survival as much as possible.

Recovery Time for Glioblastoma Treatment

Glioblastoma is a fast-growing brain tumor, so recovery time varies significantly from patient to patient depending on several factors such as age, tumor size, tumor location, and the type of treatment used.

1. Recovery After Surgery

After tumor removal surgery:

Hospital stay usually lasts 5 days to 2 weeks
Home recovery may take 4 to 6 weeks

If the patient experiences weakness in movement or speech, physical therapy or neurological rehabilitation may begin early.

Factors affecting recovery include:

The amount of tumor removed
The tumor’s proximity to motor or speech centers
The patient’s overall health before surgery
Whether complications occur

Some patients return to light daily activities within about one month, while others may need longer recovery periods.

2. Recovery During Radiation and Chemotherapy

After surgery, patients usually begin:

Radiation therapy for about 6 weeks
Chemotherapy (Temozolomide) during or after radiation, which may continue for several months

During this time, patients may experience:

General fatigue
Mild headaches
Nausea or loss of appetite
Hair loss in the treated area

Fatigue typically improves within a few weeks after radiation therapy ends, although some patients may experience longer-term tiredness.

3. Improvement of Neurological Symptoms

Headaches often improve within days to weeks after surgery
Movement weakness may improve over weeks or months with physical therapy
Speech or memory problems may partially improve depending on how much brain tissue was affected

In some cases, if permanent damage occurred in a sensitive brain area, some symptoms may remain, and long-term rehabilitation becomes very important.