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Central nervous system atypical teratoid/rhabdoid tumor is a disease in which malignant (cancer) cells form in the tissues of the brain.
Central nervous system (CNS) atypical teratoid/rhabdoid tumor (AT/RT) is a very rare, fast-growing tumor of the brain and spinal cord. It usually occurs in children younger than three years of age, although it can occur in older children and adults.
About half of these tumors form in the cerebellum or brain stem. The cerebellum is the part of the brain that controls movement, balance, and posture. The brain stem controls breathing, heart rate, and the nerves and muscles used in seeing, hearing, walking, talking, and eating. AT/RT may also be found in other parts of the central nervous system (brain and spinal cord).
This summary describes the treatment of primary brain tumors (tumors that begin in the brain). Treatment for metastatic brain tumors, which are tumors formed by cancer cells that begin in other parts of the body and spread to the brain, is not discussed in this summary. For more information see the PDQ summary on Childhood Brain and Spinal Cord Tumors Treatment Overview about the different types of childhood brain and spinal cord tumors.
Brain tumors can occur in both children and adults; however, treatment for children may be different than treatment for adults. See the PDQ treatment summary on Adult Brain Tumors for more information.
Certain genetic changes may increase the risk of atypical teratoid/rhabdoid tumor.
Anything that increases the risk of getting a disease is called a risk factor. Having a risk factor does not mean that you will get cancer; not having risk factors doesn't mean that you will not get cancer. Talk with your child's doctor if you think your child may be at risk.
Atypical teratoid/rhabdoid tumor may be linked to a change in a tumor suppressor gene called SMARCB1. This type of gene makes a protein that helps control cell growth. Changes in the DNA of tumor suppressor genes like SMARCB1 may lead to cancer.
Changes in the SMARCB1 gene may be inherited (passed on from parents to offspring). When the SMARCB1 gene change is inherited, tumors may form in two parts of the body at the same time (for example, in the brain and the kidney). If AT/RT is diagnosed, genetic counseling (a discussion with a trained professional about inherited diseases and a possible need for gene testing) may be recommended.
The symptoms of atypical teratoid/rhabdoid tumor are not the same in every patient.
Because atypical teratoid/rhabdoid tumor is fast growing, symptoms may develop quickly and progress over a period of days or weeks. Symptoms vary and depend on the age of the patient and where the tumor has formed.
These symptoms may be caused by AT/RT or by other conditions. Check with a doctor if your child has any of the following problems:
Tests that examine the brain and spinal cord are used to detect (find) atypical teratoid/rhabdoid tumor.
The following tests and procedures may be used:
Childhood atypical teratoid/rhabdoid tumor is diagnosed and may be removed in surgery.
If doctors think there might be a brain tumor, a biopsy may be done to remove a sample of tissue. For tumors in the brain, the biopsy is done by removing part of the skull and using a needle to remove a sample of tissue. A pathologist views the tissue under a microscope to look for cancer cells. If cancer cells are found, the doctor may remove as much tumor as safely possible during the same surgery. The pathologist checks the cancer cells to find out the type of brain tumor. It is often difficult to completely remove AT/RT because of where the tumor is in the brain and because it may already have spread at the time of diagnosis. Craniotomy: An opening is made in the skull and a piece of the skull is removed to show part of the brain.
In order to tell the difference between AT/RT and other brain tumors, an immunohistochemistry study may be done on the sample of tissue that is removed. An immunohistochemistry study is a laboratory test in which a substance such as an antibody, dye, or radioisotope is added to a sample of cancer tissue to test for certain antigens.
Certain factors affect prognosis (chance of recovery) and treatment options.
The prognosis (chance of recovery) and treatment options depend on the following:
There is no standard staging system for central nervous system atypical teratoid/rhabdoid tumor.
The extent or spread of cancer is usually described as stages. There is no standard staging system for central nervous system atypical teratoid/rhabdoid tumor. This tumor is classified as newly diagnosed or recurrent. Treatment depends on how much cancer remains after surgery and the age of the child. Results from the following procedures are used to plan treatment:
There are three ways that cancer spreads in the body.
The three ways that cancer spreads in the body are:
When cancer cells break away from the primary (original) tumor and travel through the lymph or blood to other places in the body, another (secondary) tumor may form. This process is called metastasis. The secondary (metastatic) tumor is the same type of cancer as the primary tumor. For example, if breast cancer spreads to the bones, the cancer cells in the bones are actually breast cancer cells. The disease is metastatic breast cancer, not bone cancer.
There are different types of treatment for patients with central nervous system atypical teratoid/rhabdoid tumor.
Different types of treatment are available for patients with central nervous system atypical teratoid/rhabdoid tumor (AT/RT). Treatment for AT/RT is usually within a clinical trial. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients with cancer.
Clinical trials are taking place in many parts of the country. Information about ongoing clinical trials is available from the NCI Web site. Choosing the most appropriate cancer treatment is a decision that ideally involves the patient, family, and health care team.
Patients may want to think about taking part in a clinical trial.
For some patients, taking part in a clinical trial may be the best treatment choice. Clinical trials are part of the cancer research process. Clinical trials are done to find out if new cancer treatments are safe and effective or better than the standard treatment.
Many of today's standard treatments for cancer are based on earlier clinical trials. Patients who take part in a clinical trial may receive the standard treatment or be among the first to receive a new treatment.
Patients who take part in clinical trials also help improve the way cancer will be treated in the future. Even when clinical trials do not lead to effective new treatments, they often answer important questions and help move research forward.
Patients can enter clinical trials before, during, or after starting their cancer treatment.
Some clinical trials only include patients who have not yet received treatment. Other trials test treatments for patients whose cancer has not gotten better. There are also clinical trials that test new ways to stop cancer from recurring (coming back) or reduce the side effects of cancer treatment.
Clinical trials are taking place in many parts of the country. See the Treatment Options section that follows for links to current treatment clinical trials. These have been retrieved from NCI's listing of clinical trials.
Children with atypical teratoid/rhabdoid tumor should have their treatment planned by a team of health care providers who are experts in treating cancer in children.
Treatment will be overseen by a pediatric oncologist, a doctor who specializes in treating children with cancer. The pediatric oncologist works with other pediatric health care providers who are experts in treating children with central nervous system cancer and who specialize in certain areas of medicine. These may include the following specialists:
Childhood brain tumors may cause symptoms that begin before diagnosis and continue for months or years.
Symptoms caused by the tumor may begin before diagnosis. These symptoms may continue for months or years. It is important to talk with your child's doctors about symptoms caused by the tumor that may continue after treatment.
Some cancer treatments cause side effects months or years after treatment has ended.
Side effects from cancer treatment that begin during or after treatment and continue for months or years are called late effects. Late effects of cancer treatment may include the following:
Some late effects may be treated or controlled. It is important to talk with your child's doctors about the effects cancer treatment can have on your child. (See the PDQ summary on Late Effects of Treatment for Childhood Cancer for more information).
Four types of treatment are used:
Surgery is used to diagnose and treat atypical teratoid/rhabdoid tumor. See the General Information section of this summary.
Even if the doctor removes all the cancer that can be seen at the time of the surgery, most patients will be given chemotherapy and possibly radiation therapy after surgery to kill any cancer cells that are left. Treatment given after the surgery, to lower the risk that the cancer will come back, is called adjuvant therapy.
Chemotherapy is a cancer treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. When chemotherapy is taken by mouth or injected into a vein or muscle, the drugs enter the bloodstream and can reach cancer cells throughout the body (systemic chemotherapy). When chemotherapy is placed directly into the cerebrospinal fluid, an organ, or a body cavity such as the abdomen, the drugs mainly affect cancer cells in those areas (regional chemotherapy). The way the chemotherapy is given depends on the type of cancer being treated.
Anticancer drugs given by mouth or vein to treat brain and spinal cord tumors cannot cross the blood-brain barrier and enter the fluid that surrounds the brain and spinal cord. Instead, an anticancer drug is injected into the fluid-filled space to kill cancer cells there. This is called intrathecal chemotherapy.
Radiation therapy is a cancer treatment that uses high-energy x-rays or other types of radiation to kill cancer cells or keep them from growing. There are two types of radiation therapy. External radiation therapy uses a machine outside the body to send radiation toward the cancer. Internal radiation therapy uses a radioactive substance sealed in needles, seeds, wires, or catheters that are placed directly into or near the cancer. The way the radiation therapy is given depends on the type of tumor being treated and whether it has spread. External radiation therapy may be given to the brain and spinal cord.
Because radiation therapy can affect growth and brain development in young children, especially children who are three years old or younger, the dose of radiation therapy may be lower than usual.
High-dose chemotherapy with stem cell transplant
High-dose chemotherapy with stem cell transplant is a method of giving high doses of chemotherapy and replacing blood -forming cells destroyed by the cancer treatment. Stem cells (immature blood cells) are removed from the blood or bone marrow of the patient or a donor and are frozen and stored. After the chemotherapy is completed, the stored stem cells are thawed and given back to the patient through an infusion. These reinfused stem cells grow into (and restore) the body's blood cells.
Follow-up tests may be needed.
Some of the tests that were done to diagnose the cancer may be repeated. Some tests will be repeated in order to see how well the treatment is working. Decisions about whether to continue, change, or stop treatment may be based on the results of these tests.
Some of the tests will continue to be done from time to time after treatment has ended. The results of these tests can show if your child's condition has changed or if the cancer has recurred (come back). These tests are sometimes called follow-up tests or check-ups.
There is no standard treatment for patients with central nervous system atypical teratoid/rhabdoid tumor.
Combinations of treatments are used for patients with atypical teratoid/rhabdoid tumor.
Because atypical teratoid/rhabdoid tumor (AT/RT) is fast-growing, a combination of treatments is usually given. Most treatments include both surgery and chemotherapy. Treatments for AT/RT may include combinations of the following:
Clinical trials of new treatments should be considered for patients with newly diagnosed atypical teratoid/rhabdoid tumor.
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with childhood atypical teratoid/rhabdoid tumor. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
There is no standard treatment for patients with recurrent childhood central nervous system atypical teratoid/rhabdoid tumor.
Clinical trials of new treatments should be considered for patients with recurrent atypical teratoid/rhabdoid tumor.
For more information about childhood central nervous system atypical teratoid/rhabdoid tumor and other childhood brain tumors, see the following:
For more childhood cancer information and other general cancer resources, see the following:
The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.
Changes were made to this summary to match those made to the health professional verison.
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PDQ also contains information on clinical trials.
A clinical trial is a study to answer a scientific question, such as whether one treatment is better than another. Trials are based on past studies and what has been learned in the laboratory. Each trial answers certain scientific questions in order to find new and better ways to help cancer patients. During treatment clinical trials, information is collected about the effects of a new treatment and how well it works. If a clinical trial shows that a new treatment is better than one currently being used, the new treatment may become "standard." In the United States, about two-thirds of children with cancer are treated in a clinical trial at some point in their illness.
Listings of clinical trials are included in PDQ and are available online at NCI's Web site. Descriptions of the trials are available in health professional and patient versions. For additional help in locating a childhood cancer clinical trial, call the Cancer Information Service at 1-800-4-CANCER (1-800-422-6237).
The PDQ database contains listings of groups specializing in clinical trials.
The Children's Oncology Group (COG) is the major group that organizes clinical trials for childhood cancers in the United States. Information about contacting COG is available on the NCI Web site or from the Cancer Information Service at 1-800-4-CANCER (1-800-422-6237).
Last Revised: 2013-01-30
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