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General Information About Ewing Sarcoma
Ewing sarcoma is a type of tumor that forms from a certain kind of cell in bone or soft tissue.
Ewing sarcoma most often forms in the bones of the legs, arms, feet, hands, chest, pelvis, spine, or skull. Less often, it forms in the soft tissue of the trunk, arms, legs, head, neck, retroperitoneum (area in the back of the abdomen behind the tissue that lines the abdominal wall and covers most of the organs in the abdomen), or other areas.
Ewing sarcoma is most common in adolescents and young adults (teens through mid-20s).
Ewing sarcoma has also been called peripheral primitive neuroectodermal tumor, Askin tumor (Ewing sarcoma of the chest wall), extraosseous Ewing sarcoma (Ewing sarcoma in tissue other than bone), and Ewing sarcoma family of tumors.
Undifferentiated small round cell sarcoma may also form in the bone or soft tissue.
Undifferentiated small round cell sarcoma usually forms in the bones or the muscles that are attached to bones and that help the body move. There are five types of undifferentiated small round cell sarcoma that are treated like Ewing sarcoma:
- Undifferentiated small round cell sarcoma with BCOR rearrangements. This type of bone tumor usually forms in the pelvis, arms, or legs. It may spread to other parts of the body. This type of bone tumor is more common in children younger than 18 years. In this type of round cell sarcoma, the BCORgene is joined to the CCNB3 gene or to other genes. To diagnose this small round cell sarcoma, the tumor cells are checked for these gene changes.
- Undifferentiated small round cell sarcoma with CIC::DUX4 rearrangements. This type of soft tissue tumor usually forms in the trunk, arms, or legs. It is most common in males and in young adults between 21 and 40 years of age. In this type of small round cell sarcoma, the CIC gene is joined to the DUX4 gene. To diagnose this small round cell sarcoma, the tumor cells are checked for this gene change.
- Undifferentiated small round cell sarcoma with CIC::NUTM1 rearrangements. This type of soft tissue tumor usually forms in the central nervous system, but it can also form in the trunk. It is most common in younger patients.
- Undifferentiated small round cell sarcoma with EWSR1::NFATC2 and FUS::NFATC2 rearrangements. This type of soft tissue tumor may be a benign cyst or a malignant (cancer) tumor. It usually forms in the arms and legs. The malignant tumor is more common in males and in adults.
- Undifferentiated small round cell sarcoma with EWSR1::PATZ1 fusions. This type of soft tissue tumor usually forms in the trunk and is more common in adults.
A genetic condition may increase the risk of Ewing sarcoma and other sarcomas.
Anything that increases a person's chance of getting a disease is called a risk factor. Not every child with one or more of these risk factors will develop Ewing sarcoma or other sarcomas, and they can develop in some children who don't have any known risk factors. Children with Fanconi anemia may be at increased risk for Ewing sarcoma. Talk with your child's doctor if you think your child may be at risk.
Signs and symptoms of Ewing sarcoma include swelling and pain near the tumor.
These and other signs and symptoms may be caused by Ewing sarcoma or by other conditions. Check with your child's doctor if they have any of the following:
- A lump (which may feel soft and warm) in the arms, legs, chest, or pelvis.
- Pain and/or swelling near the lump.
- Fever for no known reason.
- A bone that breaks for no known reason.
Tests that examine the bone and soft tissue are used to diagnose and stage Ewing sarcoma.
Procedures that make pictures of the bones and soft tissues and nearby areas help diagnose Ewing sarcoma and show how far the cancer has spread. The process used to find out if cancer cells have spread within and around the bones and soft tissues or to other parts of the body is called staging.
To plan treatment, it is important to know whether the cancer has spread to other parts of the body. Tests and procedures to detect, diagnose, and stage Ewing sarcoma are usually done at the same time.
In addition to asking about your child's personal and family health history and doing a physical exam, your child's doctor may perform the following tests and procedures to diagnose or stage Ewing sarcoma:
- MRI (magnetic resonance imaging): A procedure that uses a magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body, such as the area where the tumor formed. This procedure is also called nuclear magnetic resonance imaging (NMRI).
Magnetic resonance imaging (MRI) scan. The child lies on a table that slides into the MRI machine, which takes a series of detailed pictures of areas inside the body. The positioning of the child on the table depends on the part of the body being imaged. - CT scan (CAT scan): A procedure that makes a series of detailed pictures of areas inside the body, such as the area where the tumor formed or the chest, taken from different angles. The pictures are made by a computer linked to an x-ray machine. A dye may be injected into a vein or swallowed to help the organs or tissues show up more clearly. This procedure is also called computed tomography, computerized tomography, or computerized axial tomography.
Computed tomography (CT) scan. The child lies on a table that slides through the CT scanner, which takes a series of detailed x-ray pictures of areas inside the body. - PET-CT scan: A procedure that combines the pictures from a PET scan and a computed tomography (CT) scan. The PET and CT scans are done at the same time on the same machine. The pictures from both scans are combined to make a more detailed picture than either test would make by itself.
Positron emission tomography (PET) scan. The child lies on a table that slides through the PET scanner. The head rest and white strap help the child lie still. A small amount of radioactive glucose (sugar) is injected into the child's vein, and a scanner makes a picture of where the glucose is being used in the body. Cancer cells show up brighter in the picture because they take up more glucose than normal cells do. - Bone scan: A procedure to check if there are rapidly dividing cells, such as cancer cells, in the bone. A very small amount of radioactive material is injected into a vein and travels through the bloodstream. The radioactive material collects in the bones with cancer and is detected by a scanner.
Bone scan. A small amount of radioactive material is injected into the child's vein and travels through the blood. The radioactive material collects in the bones. As the child lies on a table that slides under the scanner, the radioactive material is detected and images are made on a computer screen. - Bone marrow aspiration and biopsy: The removal of bone marrow and a small piece of bone by inserting a hollow needle into the hipbone. Samples are removed from both hipbones. A pathologist views the bone marrow and bone under a microscope to see if the cancer has spread.
Bone marrow aspiration and biopsy. After a small area of skin is numbed, a bone marrow needle is inserted into the child's hip bone. Samples of blood, bone, and bone marrow are removed for examination under a microscope. - X-ray: An x-ray is a type of energy beam that can go through the body and onto film, making a picture of areas inside the body, such as the chest or the area where the tumor formed.
- Complete blood count (CBC): A procedure in which a sample of blood is drawn and checked for the following:
- The number of red blood cells, white blood cells, and platelets.
- The amount of hemoglobin (the protein that carries oxygen) in the red blood cells.
- The portion of the blood sample made up of red blood cells.
- Blood chemistry studies: A procedure in which a blood sample is checked to measure the amounts of certain substances, such as lactate dehydrogenase (LDH), released into the blood by organs and tissues in the body. An unusual (higher or lower than normal) amount of a substance can be a sign of disease.
A biopsy is done to diagnose Ewing sarcoma.
Tissue samples are removed during a biopsy so they can be viewed under a microscope by a pathologist to check for signs of cancer. It is helpful if the biopsy is done at the same center where treatment will be given. The following types of biopsy are used to diagnose Ewing sarcoma:
- Incisional biopsy: For an incisional biopsy, a sample of tissue is removed through an incision in the skin.
- Needle biopsy: For this biopsy, a sample of tissue is removed using a needle.
The specialists (pathologist, radiation oncologist, and surgeon) who will treat the patient usually work together to decide the best site to place the needle or biopsy incision. The selection of the biopsy site is important. A biopsy site that is not properly selected may result in more extensive surgery to remove the tumor or a larger area that is treated with radiation therapy.
If there is a chance that the cancer has spread to nearby lymph nodes, one or more lymph nodes may be removed and checked for signs of cancer.
The following tests may be done on the tissue that is removed:
- Cytogenetic analysis: A laboratory test in which the chromosomes of cells in a sample of tissue are counted and checked for any changes, such as broken, missing, rearranged, or extra chromosomes. Changes in certain chromosomes may be a sign of cancer. Cytogenetic analysis is used to help diagnose cancer, plan treatment, or find out how well treatment is working.
- Immunohistochemistry: A laboratory test that uses antibodies to check for certain antigens (markers) in a sample of a patient's tissue. The antibodies are usually linked to an enzyme or a fluorescent dye. After the antibodies bind to a specific antigen in the tissue sample, the enzyme or dye is activated, and the antigen can then be seen under a microscope. This type of test is used to help diagnose cancer and to help tell one type of cancer from another type of cancer.
- Flow cytometry: A laboratory test that measures the number of cells in a sample, the percentage of live cells in a sample, and certain characteristics of the cells, such as size, shape, and the presence of tumor (or other) markers on the cell surface. The cells from a sample of a patient's blood, bone marrow, or other tissue are stained with a fluorescent dye, placed in a fluid, and then passed one at a time through a beam of light. The test results are based on how the cells that were stained with the fluorescent dye react to the beam of light.
- Molecular test: A laboratory test to check for certain genes, proteins, or other molecules in a sample of tissue, blood, or other body fluid. A molecular test may be done with other procedures, such as biopsies, to help diagnose some types of cancer. Molecular tests check for certain gene or chromosome changes that occur in some Ewing sarcomas.
- Reverse transcription–polymerase chain reaction (RT–PCR) test: A laboratory test in which the amount of a genetic substance called mRNA made by a specific gene is measured. An enzyme called reverse transcriptase is used to convert a specific piece of RNA into a matching piece of DNA, which can be amplified (made in large numbers) by another enzyme called DNA polymerase. The amplified DNA copies help tell whether a specific mRNA is being made by a gene. RT–PCR can be used to check the activation of certain genes that may indicate the presence of cancer cells. This test may be used to look for certain changes in a gene or chromosome, which may help diagnose cancer.
Certain factors affect prognosis (chance of recovery).
The factors that affect prognosis are different before and after treatment.
Before any treatment is given, prognosis depends on:
- Where in the body the tumor started.
- Whether the tumor formed in the bone or in soft tissue.
- Whether the tumor has spread to lymph nodes or distant parts of the body.
- How large the tumor is when the tumor is diagnosed.
- Whether the LDH level in the blood is higher than normal.
- Whether the tumor has certain gene changes.
- Whether tumor DNA has been found in the blood.
- The patient's age.
- The patient's sex.
- Whether the patient has had treatment for a different cancer.
- Whether the tumor has just been diagnosed or has recurred (come back).
After treatment is given, prognosis is affected by:
- Whether the tumor was completely removed by surgery.
- Whether the tumor responded to chemotherapy or radiation therapy.
If the cancer recurs after initial treatment, prognosis depends on:
- Whether the cancer came back more than two years after the initial treatment.
- Whether the cancer came back where it first formed and in other parts of the body, or whether the cancer came back in only one site.
Treatment Option Overview
There are different types of treatment for children with Ewing sarcoma.
Different types of treatments are available for children with Ewing sarcoma. 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 and adolescents is rare, taking part in a clinical trial should be considered. Some clinical trials are open only to patients who have not started treatment.
Children with Ewing sarcoma 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 health care providers who are experts in treating children with Ewing sarcoma and who specialize in certain areas of medicine. These may include the following specialists:
- Pediatrician.
- Surgical oncologist or orthopedic oncologist.
- Radiation oncologist.
- Pediatric nurse specialist.
- Social worker.
- Rehabilitation specialist.
- Psychologist.
Four types of treatment are used:
Chemotherapy
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). Combination chemotherapy is treatment using more than one anticancer drug.
Systemic combination chemotherapy is part of the treatment for all patients with Ewing tumors. It is often the first treatment given and lasts for about 6 to 12 months. Chemotherapy is often given to shrink the tumor before surgery or radiation therapy and to kill any tumor cells that may have spread to other parts of the body.
For more information, see Drugs Approved for Soft Tissue Sarcoma.
Radiation 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. External radiation therapy uses a machine outside the body to send radiation toward the area of the body with cancer.
Radiation therapy is used when the tumor cannot be removed by surgery or when surgery to remove the tumor will affect important body functions or the way the child will look. It may be used to make the tumor smaller and decrease the amount of tissue that needs to be removed during surgery. It may also be used to treat any tumor that remains after surgery and tumors that have spread to other parts of the body.
Radiation therapy may also be used as palliative therapy to relieve symptoms caused by the tumor in the bone.
Surgery
Surgery is usually done to remove cancer that is left after chemotherapy or radiation therapy. When possible, the whole tumor is removed by surgery. Tissue and bone that are removed may be replaced with a graft, which uses tissue and bone taken from another part of the patient's body or a donor. Sometimes an implant, such as artificial bone, is used.
After the doctor removes all the cancer that can be seen at the time of the surgery, some patients may be given chemotherapy or radiation therapy 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.
High-dose chemotherapy with stem cell rescue
High doses of chemotherapy are given to kill cancer cells. Healthy cells, including blood -forming cells, are also destroyed by the cancer treatment. Stem cell transplant is a treatment to replace the blood-forming cells. Stem cells (immature blood cells) are removed from the blood or bone marrow of the patient and are frozen and stored. After the patient completes chemotherapy, 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. Chemotherapy with stem cell rescue is used to treat localized and recurrent Ewing sarcoma.
New types of treatment are being tested in clinical trials.
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 website.
Immunotherapy
Immunotherapy helps a person's immune system fight cancer. Types of immunotherapy include:
- CAR T-cell therapy: This treatment changes the patient's T cells (a type of immune system cell) so they will attack certain proteins on the surface of cancer cells. T cells are taken from the patient and special receptors are added to their surface in the laboratory. The changed cells are called chimeric antigen receptor (CAR) T cells. The CAR T cells are grown in the laboratory and given to the patient by infusion. The CAR T cells multiply in the patient's blood and attack cancer cells. CAR T-cell therapy is being studied to treat recurrent Ewing sarcoma.
CAR T-cell therapy. A type of treatment in which a patient's T cells (a type of immune cell) are changed in the laboratory so they will bind to cancer cells and kill them. Blood from a vein in the patient's arm flows through a tube to an apheresis machine (not shown), which removes the white blood cells, including the T cells, and sends the rest of the blood back to the patient. Then, the gene for a special receptor called a chimeric antigen receptor (CAR) is inserted into the T cells in the laboratory. Millions of the CAR T cells are grown in the laboratory and then given to the patient by infusion. The CAR T cells are able to bind to an antigen on the cancer cells and kill them.
Treatment for Ewing sarcoma may cause side effects.
To learn more about side effects that begin during treatment for cancer, visit Side Effects.
Side effects from cancer treatment that begin after treatment and continue for months or years are called late effects. Late effects of cancer treatment may include the following:
- Physical problems.
- Changes in mood, feelings, thinking, learning, or memory.
- Second cancers (new types of cancer). Patients treated for Ewing sarcoma have an increased risk of acute myeloid leukemia and myelodysplastic syndrome. There is also an increased risk of sarcoma in the area treated with radiation therapy.
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. For more information, see Late Effects of Treatment for Childhood Cancer.
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. Information about clinical trials supported by NCI can be found on NCI's clinical trials search webpage. Clinical trials supported by other organizations can be found on the ClinicalTrials.gov website.
Follow-up tests may be needed.
As your child goes through treatment, they will have follow-up tests or check-ups. Some tests that were done to diagnose or stage the cancer may be repeated 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).
