Posted Date: Apr 27, 2014
Expert-reviewed information summary about the treatment of childhood medulloblastoma and childhood supratentorial primitive neuroectodermal and pineal tumors.
Central nervous system (CNS) embryonal tumors form in embryonic cells that remain in the brain after birth. CNS embryonal tumors tend to spread through the cerebrospinal fluid (CSF) to other parts of the brain and spinal cord.
The tumors may be malignant (cancer) or benign (not cancer). Most CNS embryonal tumors in children are malignant. Malignant brain tumors are likely to grow quickly and spread into other parts of the brain. When a tumor grows into or presses on an area of the brain, it may stop that part of the brain from working the way it should. Benign brain tumors grow and press on nearby areas of the brain. They rarely spread to other parts of the brain. Both benign and malignant brain tumors can cause signs or symptoms and need treatment.
Although cancer is rare in children, brain tumors are the third most common type of childhood cancer, after leukemia and lymphoma. This summary is about the treatment of primary brain tumors (tumors that begin in the brain). The treatment of metastatic brain tumors, which begin in other parts of the body and spread to the brain, is not discussed in this summary. For information about the different types of brain and spinal cord tumors, see the PDQ summary on Childhood Brain and Spinal Cord Tumors Treatment Overview.
Brain tumors occur in both children and adults. Treatment for adults may be different from treatment for children. See the PDQ treatment summary on Adult Brain Tumors for more information on the treatment of adults.
Anatomy of the inside of the brain, showing the pineal and pituitary glands, optic nerve, ventricles (with cerebrospinal fluid shown in blue), and other parts of the brain.
The different types of CNS embryonal tumors include:
Childhood CNS atypical teratoid/rhabdoid tumor is also a type of embryonal tumor, but it is treated differently than other childhood CNS embryonal tumors. See the PDQ summary on Childhood Central Nervous System Atypical Teratoid/Rhabdoid Tumor Treatment for more information.
Pineoblastomas form in cells of the pineal gland and are usually malignant. Pineoblastomas are fast-growing tumors with cells that look very different from normal pineal gland cells. Pineoblastomas are not a type of CNS embryonal tumor but treatment for them is a lot like treatment for CNS embryonal tumors.
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 doesnât mean that you will not get cancer. Talk with your childâs doctor if you think your child may be at risk.
Risk factors for CNS embryonal tumors include having the following inherited diseases:
In most cases, the cause of CNS embryonal tumors is not known.
These and other signs and symptoms may be caused by childhood CNS embryonal tumors, pineoblastomas, or other conditions. Check with your child's doctor if your child has any of the following:
Infants and young children with these tumors may be irritable or grow slowly. Also they may not eat well or meet developmental milestones such as sitting, walking, and talking in sentences.
The following tests and procedures may be used:
If doctors think your child may have a CNS embryonal tumor or pineoblastoma, a biopsy may be done. For brain tumors, the biopsy is done by removing part of the skull and using a needle to remove a sample of tissue. Sometimes, a computer-guided needle is used to remove the tissue sample. 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 piece of skull is usually put back in place after the procedure.
Craniotomy: An opening is made in the skull and a piece of the skull is removed to show part of the brain.
The following tests may be done on the sample of tissue that is removed:
There is no standard staging system for childhood central nervous system (CNS) embryonal tumors and pineoblastomas. Instead, treatment depends on the type of tumor and the child's age (3 years and younger or older than 3 years).
Medulloblastomas are called average risk when all of the following are true:
Medulloblastomas are called high risk if any of the following are true:
In general, cancer is more likely to recur (come back) in patients with a high-risk tumor.
Some of the tests used to detect childhood CNS embryonal tumors or pineoblastomas are repeated after surgery to remove the tumor. (See the General Information section.) This is to find out how much tumor remains after surgery.
Other tests and procedures may be done to find out if the cancer has spread:
A recurrent childhood central nervous system (CNS) embryonal tumor is a tumor that recurs (comes back) after being treated. Childhood CNS embryonal tumors most often recur within 3 years after treatment but may come back many years later. Recurrent childhood CNS embryonal tumors may come back in the same place as the original tumor and/ or in a different place in the brain or spinal cord. CNS embryonal tumors rarely spread to other parts of the body.
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with recurrent childhood brain 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. Talk with your child's doctor about clinical trials that may be right for your child. General information about clinical trials is available from the NCI Web site.
Different types of treatment are available for children with central nervous system (CNS) embryonal tumors. Some treatments are standard (the currently used treatment), and some are being tested in clinical trials. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients with cancer. When clinical trials show that a new treatment is better than the standard treatment, the new treatment may become the standard treatment.
Because cancer in children is rare, taking part in a clinical trial should be considered. Some clinical trials are open only to patients who have not started treatment.
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 brain tumors and who specialize in certain areas of medicine. These may include the following specialists:
Signs and symptoms caused by the tumor may begin before diagnosis and continue for months or years. It is important to talk with your child's doctors about signs and symptoms caused by the tumor that may continue after treatment.
Children diagnosed with medulloblastoma may have certain problems after surgery or radiation therapy such as changes in the ability to think, learn, and pay attention. Also, cerebellar mutism syndrome may occur after surgery. Signs of this syndrome 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).
Surgery is used to diagnose and treat a childhood CNS embryonal tumor as described in 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, some patients may be given chemotherapy and/or 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.
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.
Radiation therapy to the brain can affect growth and development in young children. For this reason, clinical trials are studying new ways of giving radiation that may have fewer side effects than standard methods. For childhood CNS embryonal tumors, radiation therapy may be given in the following ways:
The way the radiation therapy is given depends on the type of cancer being treated.
Because radiation therapy can affect growth and brain development in young children, especially children who are three years old or younger, chemotherapy may be given to delay or reduce the need for radiation 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). Combination chemotherapy is treatment using more than one anticancer drug. The way the chemotherapy is given depends on the type of cancer being treated.
Regular dose anticancer drugs given by mouth or vein to treat central nervous system 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 that may have spread there. This is called intrathecal or intraventricular chemotherapy.Intrathecal chemotherapy. Anticancer drugs are injected into the intrathecal space, which is the space that holds the cerebrospinal fluid (CSF, shown in blue). There are two different ways to do this. One way, shown in the top part of the figure, is to inject the drugs into an Ommaya reservoir (a dome-shaped container that is placed under the scalp during surgery; it holds the drugs as they flow through a small tube into the brain). The other way, shown in the bottom part of the figure, is to inject the drugs directly into the CSF in the lower part of the spinal column, after a small area on the lower back is numbed.
High-dose chemotherapy with stem cell rescue is a way 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 bodyâs blood cells.
This summary section describes treatments that are being studied in clinical trials. It may not mention every new treatment being studied. Information about clinical trials is available from the NCI Web site.
Targeted therapy uses drugs or other substances to identify and attack specific cancer cells without harming normal cells. Signal transduction inhibitor therapy is a type of targeted therapy being studied in the treatment of recurrent childhood medulloblastoma. Signal transduction inhibitors block signals that are passed from one molecule to another inside a cell. Blocking these signals may kill cancer cells.
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.
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.
Some of the tests that were done to diagnose the cancer or to find out the stage of the cancer may be repeated. (See the General Information section for a list of tests.) 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. This is sometimes called re-staging.
Some of the imaging 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 brain tumor has recurred (come back). If the imaging tests show abnormal tissue in the brain, a biopsy may also be done to find out if the tissue is made up of dead tumor cells or if new cancer cells are growing. These tests are sometimes called follow-up tests or check-ups.
Children older than 3 years with average-risk medulloblastoma
Standard treatment of average-risk medulloblastoma in children older than 3 years includes the following:
Children older than 3 years with high-risk medulloblastoma
Standard treatment of high-risk medulloblastoma in children older than 3 years includes the following:
Children aged 3 years and younger
Standard treatment of medulloblastoma in children aged 3 years and younger is:
Other treatments that may be given after surgery include the following:
Treatment of medulloblastoma in children aged 3 years and younger is often within a clinical trial. Clinical trials are studying new combinations and schedules of chemotherapy with or without stem cell rescue.
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with untreated childhood medulloblastoma. 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. Talk with your child's doctor about clinical trials that may be right for your child. General information about clinical trials is available from the NCI Web site.
In newly diagnosed childhood central nervous system (CNS) primitive neuroectodermal tumors, the tumor itself has not been treated. The child may have received drugs or treatment to relieve symptoms caused by the tumor.
Children older than 3 years
Standard treatment of CNS primitive neuroectodermal tumors in children older than 3 years is:
Children aged 3 years and younger
Standard treatment of CNS primitive neuroectodermal tumors in children aged 3 years and younger is:
Other treatments that may be given after surgery include the following:
Treatment of CNS primitive neuroectodermal tumors in children aged 3 years and younger is often within a clinical trial. Clinical trials are studying new combinations of chemotherapy with stem cell rescue.
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with untreated childhood supratentorial primitive neuroectodermal 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. Talk with your child's doctor about clinical trials that may be right for your child. General information about clinical trials is available from the NCI Web site.
Children older than 3 years
Standard treatment of medulloepithelioma and ependymoblastoma in children older than 3 years includes the following: