About Brain Cancers
Brain cancer, also known as primary brain cancer, refers to an overgrowth of cells in the brain that form masses called brain tumors. These tumors can be either benign (noncancerous) or malignant (cancerous). Unlike secondary brain cancer, which starts in another part of the body and spreads to the brain, primary brain cancer originates in the brain itself.
Malignant brain tumors can grow rapidly and disrupt the normal functioning of the body. While brain cancer is relatively uncommon, it can be life-threatening and requires prompt treatment. According to estimates from the American Cancer Society, the chance of developing a malignant brain tumor in one's lifetime is less than 1 percent.
Brain cancer is an umbrella term that encompasses various types of conditions and diseases. Here are some examples:
- Astrocytomas: These are tumors that develop from astrocytes, which are a type of glial cell in the brain. Astrocytomas can be low-grade (slow-growing) or high-grade (fast-growing).
- Ependymomas: These tumors arise from ependymal cells, which line the ventricles (fluid-filled spaces) of the brain and the spinal cord. Ependymomas can occur in both children and adults.
- Oligodendrogliomas: These tumors originate from oligodendrocytes, which are responsible for producing myelin, a substance that insulates nerve cells. Oligodendrogliomas typically occur in adults and tend to grow slowly.
It's important to note that these are just a few examples of brain cancer types. There are other types as well, each with its own characteristics and treatment approaches.
Brain cancer, also known as primary brain tumors, can occur due to various disease causes and can be influenced by both non-modifiable and modifiable risk factors. Let's explore each of these in detail:
Root causes of brain cancers:
- Genetic changes: Brain tumors develop when genetic changes cause cells in the brain to replicate uncontrollably. These genetic changes can be inherited from parents or acquired throughout life.
- Cancerous and noncancerous tumors: Brain tumors can be cancerous (malignant) or noncancerous (benign). Malignant tumors grow rapidly and invade surrounding tissues, while benign tumors do not spread but may cause complications if they compress healthy brain tissue.
Non-modifiable risk factors of brain cancers are risk factors that cannot be controlled or changed. They include:
- Age: The risk of brain cancer increases with age, with most cases occurring in older adults. There are some specific brain cancers that occur more frequently in children, adolescents or young adults.
- Family history: Although most brain tumors do not run in families, certain familial cancer disorders such as neurofibromatosis 1 and 2, tuberous sclerosis, von Hippel-Lindau disease, and Li-Fraumeni syndrome can contribute to the development of specific types of brain tumors.
- Weakened immune system: People with a weakened immune system, such as those with late-stage HIV, may have an increased risk of brain tumors.
Modifiable risk factors of brain cancers can be influenced by individual habits and lifestyle. They include:
- Radiation exposure: Exposure to high doses of ionizing radiation is a well-documented risk factor for brain tumors. This can occur through radiation therapy for other cancers, frequent medical imaging tests like CT scans and X-rays, workplace exposure, or nuclear reactions.
- Smoking: Long-term smoking has been associated with an increased risk of developing brain cancer.
- Environmental exposure: Prolonged exposure to certain elements like lead, plastic, rubber, petroleum, some textiles, as well as pesticides and herbicides, may contribute to the development of brain tumors.
- Epstein-Barr virus infection: Having an Epstein-Barr virus infection or mononucleosis has been linked to an increased risk of certain types of brain cancer.
It's important to note that while these risk factors may increase the likelihood of developing brain cancer, they do not guarantee its occurrence. Additionally, many cases of brain cancer occur without any identifiable risk factors.
The symptoms of brain cancer can vary depending on the size, location, and stage of the tumor. In the early stages, brain cancer symptoms may be similar to those of other less serious conditions. However, if you have been experiencing these symptoms for more than a week, if they have come on suddenly, if they are not relieved by over-the-counter pain medications, or if you are alarmed by any of them, it is a good idea to have them checked out by a doctor.
Common early symptoms of brain cancer include:
- Headaches that are usually worse in the morning
- Nausea and vomiting
- Lack of coordination and balance
- Difficulty walking
- Memory lapses
- Difficulty thinking
- Speech problems
- Vision problems
As brain cancer progresses or becomes more severe, additional symptoms may occur. These can include:
- Personality changes
- Abnormal eye movements
- Muscle jerking or twitching
- Unexplained passing out (syncope)
- Drowsiness
- Numbness or tingling in the arms or legs
- Seizures
It is important to note that these symptoms can also be caused by other conditions. However, if you experience any of these symptoms with regularity or if your symptoms become more significant, it is essential to see a doctor as soon as possible for an evaluation. Early detection greatly improves the prognosis for brain cancer.
To diagnose brain cancers, doctors perform a variety of examinations, tests, and procedures. These include:
- Neurological examination: The doctor will ask about your health and check your vision, hearing, alertness, muscle strength, and reflexes. They may also examine your eyes for any swelling.
- Brain scans: These are major tests used to confirm the presence of a brain tumor. The two most common types of brain scans are:
- Computed tomography (CT) scan: This involves an x-ray camera rotating around the body to create detailed cross-sectional images of the brain.
- Magnetic resonance imaging (MRI): This uses radio waves and strong magnets to produce detailed pictures of the brain. MRI is especially effective at detecting metastatic brain tumors.
- Biomarker test: This test measures the degree of mutation in specific genes that are responsible for certain types of brain cancers. It helps diagnose tumors, determine their type, and may assist in measuring tumor growth, treatment response, and personalized treatment therapy.
- Biopsy: A biopsy is the primary test used for diagnosing and confirming the stage of all types of cancer, including brain cancer. During a biopsy, a piece of the tumor is removed and sent to a laboratory for testing.
In addition to these examinations, tests, and procedures, there are additional ones that can be performed to determine the specific type of brain cancer. These may include:
- Tumor marker test: This involves taking a sample of blood, urine, or tissue to measure the levels of certain substances that may indicate the presence of cancer.
- Electroencephalogram (EEG): During this test, electrodes are attached to a person's head to check for any abnormal brain activity.
- Interoperative pathological examination: In some cases where the tumor is in hard-to-reach or sensitive areas, an interoperative pathological examination may be necessary to determine the nature of the tumor.
- DNA methylation analysis: This method uses DNA methylation profiles to subtype brain tumors and provide more accurate classification for precision therapy.
The general goals of treatment for brain cancers are to remove or reduce the size of tumors, alleviate symptoms caused by pressure and swelling in the brain, destroy cancer cells, and improve the patient's overall health. Here are the different treatment options and how they work to achieve these goals:
- Surgery: Surgery is the most common treatment for brain tumors. It aims to remove as much of the tumor as possible, even if complete removal is not feasible. By removing the tumor, surgery can help relieve symptoms and reduce the size of the tumor.
- Radiation therapy: This treatment uses high-energy x-ray beams to damage or destroy tumor cells. It is typically recommended when there are multiple brain metastases or when single tumors cannot be surgically removed. Radiation therapy can be delivered externally (external beam radiation) or by implanting radioactive material directly in the brain. The goal is to kill cancer cells and shrink the tumor.
- Chemotherapy: Chemotherapy uses drugs to destroy cancer cells in the brain and shrink tumors. These drugs can be administered orally or intravenously. Chemotherapy is especially challenging for brain tumors because there is a blood-brain barrier that protects brain tissue from the bloodstream.
- Immunotherapy: This is a type of biologic drug that boosts or restores the body's natural defenses against tumors. Immunotherapy, such as checkpoint inhibitors, works by increasing the immune system's ability to target and fight cancer cells.
- Combination therapy: Combination therapy involves receiving chemotherapy and radiation therapy at the same time. This approach aims to maximize treatment effectiveness by attacking cancer cells through different mechanisms.
- Lifestyle behavior changes: While not specific treatments for brain cancer, certain lifestyle behavior changes can support treatment and overall health. These may include maintaining a healthy diet, exercising regularly, getting enough restful sleep, managing stress levels, and avoiding tobacco and excessive alcohol consumption.
It's important to note that treatment approaches may vary depending on factors such as the type of primary cancer, number and location of brain lesions, extent of primary cancer, patient's general health, prior chemotherapy treatments, and response to treatment. Treatment decisions are made on an individual basis in consultation with healthcare professionals specializing in oncology and neurosurgery.
When it comes to brain cancers, the natural progression can vary depending on the specific type of tumor. However, early detection and treatment offer the best chance of recovery for both benign and malignant brain tumors.
The prognosis, or outlook, also depends on several factors such as the type of tumor, its size and location, the patient's age, the extent of any surgery, and how the tumor affects the patient's ability to function. In general, lower-grade tumors tend to have a better prognosis.
Now let's talk about the general complications of brain cancers. These complications can also vary depending on the specific type of tumor. Some common complications include:
- Neurological symptoms: Brain tumors can cause a range of neurological symptoms such as headaches, seizures, difficulty speaking or understanding language, weakness or numbness in certain parts of the body, changes in vision or hearing, and problems with balance and coordination.
- Cognitive and behavioral changes: Brain tumors can affect cognitive function and behavior. Patients may experience memory problems, difficulty concentrating or multitasking, changes in personality or mood, and even depression or anxiety.
- Physical impairments: Depending on the location of the tumor, patients may experience physical impairments such as difficulty walking or performing daily activities, muscle weakness or paralysis in certain parts of the body, and problems with fine motor skills.
Treatment may change the progression of brain cancer and help reduce the chances of complications. It's important to note that each case is unique and requires an individualized approach. The specific treatment plan will be determined by a healthcare professional who will consider factors such as the type and stage of the tumor, as well as the patient's overall health.
Remember that this information provides a general overview and it's always important to consult with a healthcare professional for personalized advice regarding your specific situation.