Let's learn about the tumors that come from star-like cells in your brain (Astrocytoma)!

We all face unexpected health problems in our lives, right? Maybe you have frequent headaches or feel like your memory is getting a little lost. While these can be normal things, sometimes they can be signs of a problem inside our body, especially the brain. Today we are going to talk about a type of tumor that can occur in the brain, which is a bit complicated, but we should all be aware of. That is Astrocytoma .

What is Astrocytoma? Let's understand it simply!

Okay, now let's see what this astrocytoma is. Simply put, it is a type of tumor that occurs in our central nervous system (CNS) , which is mainly in the brain and sometimes in the spinal cord (the nerve cord that runs down the spine). These tumors are formed from a special type of star-shaped cells in our brain. Doctors call these cells ``astrocyte cells''. These ``astrocyte cells'' are cells that belong to a group of cells that help, nourish, and protect the brain and nervous system. These helper cells are commonly called ``glial cells''. Apart from ``astrocyte cells'', there are other types of ``glial cells'' called ``oligodendrocytes'' and ``ependymal cells''. So, tumors that form when these ``glial cells'' start to grow uncontrollably are called ``glioma''. Astrocytoma is the most common type of glioma.

These astrocytoma tumors can be cancerous (malignant) or non-cancerous (benign) . That means some are dangerous and spread quickly. Some are not, and grow and spread slowly.

Doctors classify astrocytomas by their "grades," much like grades in school. These grades describe how fast the tumor is growing and how likely it is to spread to nearby brain tissue. Unlike other types of cancer, there is no "staging" system.

What are the main types of Astrocytoma?

The World Health Organization (WHO) has divided astrocytomas into four main grades. Grade 1 is the lowest-risk, slow-growing type. Grade 4 is the most aggressive, fastest-growing, and most dangerous type.

Non-cancerous (Benign) Astrocytoma

These are relatively low-risk, non-cancerous tumors.

• Grade 1 Astrocytoma:
• Pilocytic astrocytoma: This is the most common type of grade 1 tumor. It grows very slowly and is less likely to spread. It is not cancerous. Once completely removed by surgery, chemotherapy or radiation therapy is usually not needed. These tumors most often develop in the cerebellum, a part of the brain called the cerebellum .
• Pleomorphic xanthoastrocytoma: This type of tumor also often grows in the brain. It most often develops in the temporal lobe of the brain. This can cause frequent seizures. It can be cured with surgery.
• Subependymal giant cell astrocytoma (SEGA): This type of tumor occurs mainly in children with a genetic condition called tuberous sclerosis. It develops in fluid-filled cavities inside the brain called ventricles . It can also be treated with surgery.

Malignant Astrocytoma

These are dangerous tumors that contain cancer cells and can grow and spread rapidly.

• Grade 2 Astrocytoma: These tumors are more likely to spread to surrounding brain tissue, making them difficult to completely cure with surgery alone.
• Grade 3 Astrocytomas: These are more aggressive than grade 2 tumors. Often, a grade 2 tumor can progress to grade 3 over time. These can never be cured with surgery alone. Radiation therapy is definitely needed, and chemotherapy is also often needed.
• Glioblastomas: These are grade 4 astrocytomas . They are the most common and most aggressive type of astrocytoma. They grow and spread very quickly. About 10% of them develop from a pre-existing low-grade astrocytoma that has become cancerous. Or, in 90% of cases, they start out as a grade 4 tumor.

Who gets Astrocytoma?

These tumors can develop in anyone, but different grades of tumors have been found to be more common in people of different age groups:

• Grade 1 Astrocytoma: Most common in children and young adults.
• Grade 2 Astrocytoma: Most common in adults between the ages of 20 and 60.
• Grade 3 Astrocytoma: Most common in adults between 30 and 60 years old.
• Glioblastoma (grade 4 astrocytoma): Most common in adults between the ages of 50 and 80.

It is also said that men are more likely to develop grade 3 and 4 astrocytomas .

How common is this disease?

The prevalence of different grades of astrocytoma also varies:

• Grade 1 astrocytoma: About 2% of all brain tumors.
• Grade 2 astrocytoma: accounts for 2% to 5% of all brain tumors.
• Grade 3 Astrocytoma: About 4% of all brain tumors.
• Grade 4 Astrocytomas (Glioblastomas): Make up as much as 24% of all brain tumors.

Among adults, glioblastoma (grade 4 astrocytoma) is the most common type of brain cancer.

What are the symptoms of Astrocytoma?

Symptoms of this tumor can vary depending on the size of the tumor and where it is located in the brain. Some common symptoms include:

• Frequent headaches, sometimes worse in the morning.
• Nausea and vomiting.
• Seizures.
• Changes in mental status: For example, conditions such as the inability to concentrate (delirium) or complete memory loss (dementia).
• Memory loss.
• Other intellectual problems: personality changes, mood changes (such as depression).
• Excessive fatigue in the body.
• Vision problems: Blurred vision, double vision.
• Speech difficulties (aphasia): Difficulty forming words, unable to think of what to say.
• Movement problems: limbs become numb, weak, and exhibit abnormal reflexes.

If you have one or more of these symptoms, it is very important to see a doctor as soon as possible.

What are the causes of Astrocytoma?

In fact, researchers still don't know the exact cause of most astrocytomas. Most of these tumors occur sporadically. Two of the main risk factors that researchers have identified are radiation exposure and genetic influences.

However, recent research has revealed that a mutation (change) in a gene called `(IDH1 gene)` significantly contributes to the development of low-grade astrocytomas. This gene helps our cells produce energy. When this gene is mutated, a chemical called `(2-HG)` is produced. This accumulates in healthy `(astrocyte cells)` over time, and those cells begin to become abnormal. That's when astrocytomas develop.

Radiation exposure and astrocytoma

Exposure to ionizing radiation, for example from radiation therapy for cancer, increases the risk of developing astrocytoma.

For example, children with acute lymphocytic leukemia (ALL) who receive radiation therapy to prevent the disease may be 22 times more likely to develop a central nervous system tumor, such as an astrocytoma, within 5 to 10 years.

Genetic causes and astrocytoma

The following rare genetic conditions have been found to be associated with the development of astrocytomas:

• Li-Fraumeni syndrome: This condition occurs when there is a mutation in a gene called the TP53 gene. People with this syndrome have a 90% chance of developing one or more types of cancer in their lifetime. This can include astrocytoma.
• Neurofibromatosis type 1 (NF1): In this condition, a mutation in a gene that is supposed to stop tumors from growing causes cells to grow abnormally. People with NF1 may develop astrocytomas, tumors of the peripheral nerves, and café-au-lait spots on the skin.
• Tuberous sclerosis: This condition causes a variety of health problems. These include seizures, developmental delays, and the formation of tumors in various parts of the body. It is caused by mutations in two genes, the TSC1 gene and the TSC2 gene. Subependymal giant cell astrocytomas (SEGAs) usually only develop in people with tuberous sclerosis.
• Turcot syndrome: This condition is caused by mutations in several genes that prevent tumor growth. It can cause small growths (polyps) in the intestines and one or more tumors, such as astrocytomas, in the brain or spinal cord.

How is Astrocytoma diagnosed?

Because the symptoms of astrocytoma are similar to those of other neurological diseases, it can be a little difficult for doctors to suspect or diagnose.

However, your doctor will ask you about your symptoms and medical history. He or she will likely perform a neurological exam . This will help determine where the problem is in the brain or spinal cord.

Then the doctor will order a brain imaging test . An MRI (Magnetic resonance imaging) scan is the best way to find and diagnose an astrocytoma. If you can't have an MRI because you have a pacemaker or joint implant, a CT scan (Computed tomography scan) is the next best option.

If these imaging tests show anything abnormal in the brain, the doctor will likely recommend a biopsy ( taking a small piece of the tumor for testing) or resection (surgically removing the tumor). This is the only way to make a definitive diagnosis.

Can cancerous astrocytoma be cured?

Grade 1 astrocytomas can often be cured with surgery if the neurosurgeon can safely remove the entire tumor. Very rarely, some grade 2 astrocytomas can also be cured with surgery.

However, there is currently no cure for grade 3 and 4 astrocytomas (especially glioblastomas) because they grow and spread rapidly. However, radiation therapy and certain medications can control the growth of these tumors and reduce symptoms.

How is Astrocytoma treated?

Treatment options depend on several factors:

• The location, size, and type of tumor.
• your age.
• Your overall health.

A team of specialists will work together to determine the best treatment plan for you. This team may include:

• Neurologists
• Neurosurgeons
• Radiation oncologists
• Medical oncologists

The main treatments for astrocytoma are:

• Surgery.
• Radiation therapy.
• Adjuvant chemotherapy.
• Tumor-treating fields (for glioblastoma).

In addition, there may be clinical trials you can participate in.

Surgery for astrocytoma

Surgery is the first step in treating astrocytoma. It offers three main benefits:

1. You can find out exactly what type of tumor it is by taking a piece of tissue from the tumor and examining it under a microscope.

2. Doctors can do more tests on the tumor to see if there are proteins and mutations that certain drugs can target.

3. It allows for the removal of as much of the tumor as possible. This helps reduce pressure inside the brain and skull and prevents other problems.

Because grade 1 astrocytomas grow slowly and do not spread to other parts of the brain, surgery is the only treatment available.

Adjuvant therapies for astrocytoma

Adjuvant therapy, sometimes called "helper therapy," targets cancer cells that were not killed by the main treatment. In astrocytoma, surgery is the main treatment.

Grade 3 and 4 astrocytomas always require other treatments in addition to surgery. Grade 2 astrocytomas may also sometimes require additional treatments.

Some additional treatments for astrocytoma:

• Chemotherapy with temozolomide (TMZ): Chemotherapy is the use of drugs to kill cancer cells and/or stop them from multiplying. The drug, temozolomide (TMZ), works by changing the DNA of tumor cells, causing them to die. TMZ is a first-line adjuvant treatment for all grade 3 and 4 astrocytomas. It is sometimes given to grade 2 astrocytomas as well.
• Radiation therapy: This treatment uses radiation (usually high-energy X-rays) to kill cancer cells. This is a very effective way to treat astrocytomas.
• Bevacizumab: This is an injectable medication. It works by blocking the growth of blood vessels that help the tumor grow. The US Food and Drug Administration (FDA) has approved this medication for recurrent glioblastoma. It helps reduce swelling and relieve symptoms.
• Tumor-treating fields: This is a special device that produces electric fields. These fields can slow the growth of the tumor. It is worn like a helmet. Doctors may recommend this treatment for newly diagnosed and recurrent glioblastoma.

Can I prevent the development of Astrocytoma?

There is currently nothing you can do to prevent astrocytomas from developing. Most of the time, they develop randomly.

However, if you have a genetic condition that puts you at higher risk of developing astrocytoma, it's important to see your medical team regularly for checkups. They can then monitor you for signs of astrocytoma. The sooner this is identified, the better.

What is the prognosis of Astrocytoma?

The outlook, whether the disease will improve and how long you can live, depends on several factors:

• Tumor grade: The higher the grade, the worse the outlook generally becomes.
• How much of the tumor can be removed with surgery: While grade 1 astrocytomas can be cured with surgery alone, grades 2 to 4 astrocytomas cannot be completely removed. However, if the neurosurgeon can remove as much tissue as possible, the survival rate is better.
• Use of additional treatments: Additional treatments, such as chemotherapy and radiation therapy, can reduce symptoms and increase survival.
• Age: In general, younger people have a longer life expectancy.
• Mental status: Those with minimal symptoms and normal neurological function have a longer survival time.

Your medical team will be able to give you more accurate information about what to expect. Don't be afraid to ask them questions.

What is the survival rate of Astrocytoma?

The average survival rate varies depending on the grade of astrocytoma:

• Grade 1 (Pilocytic astrocytomas): More than 10 years.
• Grade 2 astrocytoma: more than 5 years.
• Grade 3 astrocytoma: Between 2 and 5 years.
• Grade 4 (Glioblastomas): About a year.

It is important to remember that these are just averages for a large group of people with astrocytomas. Your medical team will be able to provide more detailed information about survival rates based on your specific situation.

When should I see my doctor about Astrocytoma?

You will need to have follow-up appointments with neurologists, oncologists, and neurosurgeons to make sure your treatment is successful or continues to be successful.

Call your doctor as soon as possible if you develop new symptoms or if your symptoms get worse. For example:

• Memory problems.
• Convulsions.
• Severe headaches or vision problems.
• Weight loss for no reason.

What questions should I ask my doctor?

It may be helpful to ask your medical team these questions:

• Why did I get astrocytoma?
• What type of astrocytoma do I have?
• What is the best treatment for me?
• What clinical trials can I participate in?
• What are the risks and side effects of treatment?
• What aftercare will I need after treatment?
• What is the chance that the cancer will come back or spread after treatment?
• What signs of tumor growth should I look out for?
• What symptoms of treatment complications should I look out for?
• Is my family at risk of developing astrocytoma?

What is the difference between Astrocytoma and Glioblastoma?

Glioblastoma is a type of astrocytoma - specifically a grade 4 astrocytoma. Glioblastoma is an aggressive cancerous tumor that grows and spreads rapidly. It is the most common primary brain cancer.

Is Astrocytoma malignant or benign?

There are several types of astrocytomas - some are non-cancerous (benign), and some are cancerous (malignant). Grade 1 astrocytomas are non-cancerous. Grades 2 to 4 are cancerous.

Finally, what to remember (Take-Home Message)

It's normal to feel scared and overwhelmed when you find out you have a brain tumor. Astrocytoma can come in a variety of grades - some are benign, some are cancerous. But trust that your medical team will develop a personalized, comprehensive treatment plan to help you manage your astrocytoma and improve your quality of life. Don't be afraid, don't be suspicious, ask your doctors questions, and support your treatment. I wish you a speedy recovery!

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