National Cancer Institute

Expert-reviewed information summary about the treatment of Ewing sarcoma.

This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the treatment of childhood Ewing sarcoma. It is intended as a resource to inform and assist clinicians who care for cancer patients. It does not provide formal guidelines or recommendations for making health care decisions.

This summary is reviewed regularly and updated as necessary by the PDQ Pediatric Treatment Editorial Board, which is editorially independent of the National Cancer Institute (NCI). The summary reflects an independent review of the literature and does not represent a policy statement of NCI or the National Institutes of Health (NIH).

Ewing Sarcoma Treatment

General Information About Ewing Sarcoma

Dramatic improvements in survival have been achieved for children and adolescents with cancer. Between 1975 and 2010, childhood cancer mortality decreased by more than 50%. For Ewing sarcoma, the 5-year survival rate has increased over the same time from 59% to 78% for children younger than 15 years and from 20% to 60% for adolescents aged 15 to 19 years.

Studies using immunohistochemical markers, cytogenetics, molecular genetics, and tissue culture indicate that Ewing sarcoma is derived from a primordial bone marrow–derived mesenchymal stem cell. Older terms such as peripheral primitive neuroectodermal tumor, Askin tumor (Ewing sarcoma of chest wall), and extraosseous Ewing sarcoma (often combined in the term ) refer to this same tumor.


The incidence of Ewing sarcoma has remained unchanged for 30 years. The incidence for all ages is one case per 1 million people in the United States. In patients aged 10 to 19 years, the incidence is between nine and ten cases per 1 million people. The same analysis suggests that the incidence of Ewing sarcoma in the United States is nine times greater in whites than in African Americans, with an intermediate incidence in Asians.

The relative paucity of Ewing sarcoma in people of African or Asian descent may be explained, in part, by a specific polymorphism in the gene.

The median age of patients with Ewing sarcoma is 15 years, and more than 50% of patients are adolescents. Well-characterized cases of Ewing sarcoma in neonates and infants have been described. Based on data from 1,426 patients entered on European Intergroup Cooperative Ewing Sarcoma Studies, 59% of patients are male and 41% are female.

Clinical Presentation

Primary sites of bone disease include the following:

  • Lower extremity (41%).
  • Pelvis (26%).
  • Chest wall (16%).
  • Upper extremity (9%).
  • Spine (6%).
  • Hand and foot (3%).
  • Skull (2%).

For extraosseous primary tumors, the most common primary sites of disease include the following:

  • Trunk (32%).
  • Extremity (26%).
  • Head and neck (18%).
  • Retroperitoneum (16%).
  • Other sites (9%).

The median time from first symptom to diagnosis of Ewing sarcoma is often long, with a median interval reported from 2 to 5 months. Longer times are associated with older age and pelvic primary sites. This has not been associated with metastasis, surgical outcome, or survival. Approximately 25% of patients with Ewing sarcoma have metastatic disease at the time of diagnosis.

The Surveillance, Epidemiology, and End Results (SEER) database was used to compare patients younger than 40 years with Ewing sarcoma who presented with skeletal and extraosseous primary sites (refer to Table 1). Patients with extraosseous Ewing sarcoma were more likely to be older, female, nonwhite, and have axial primary sites, and were less likely to have pelvic primary sites than were patients with skeletal Ewing sarcoma.

Diagnostic Evaluation

The following tests and procedures may be used to diagnose or stage Ewing sarcoma:

  • Physical exam and history.
  • Magnetic resonance imaging (MRI).
  • Computed tomography (CT) scan.
  • Positron emission tomography (PET) scan.
  • Bone scan.
  • Bone marrow aspiration and biopsy.
  • X-ray.
  • Complete blood count.
  • Blood chemistry studies, such as lactate dehydrogenase (LDH).

Prognostic Factors

The two major types of prognostic factors for patients with Ewing sarcoma are grouped as follows:

  • Pretreatment factors.
  • Response to initial therapy factors.

Pretreatment factors

  • Site of tumor: Patients with Ewing sarcoma in the distal extremities have the best prognosis. Patients with Ewing sarcoma in the proximal extremities have an intermediate prognosis, followed by patients with central or pelvic sites.
  • Extraskeletal versus skeletal primary tumors: The Children's Oncology Group performed a retrospective analysis from two large cooperative trials that used similar treatment regimens. They identified 213 patients with extraskeletal primary tumors and 826 patients with skeletal primary tumors. Patients with extraskeletal primary tumors were more likely to have an axial primary site, less likely to have large primary tumors, and had a statistically significant better prognosis than did patients with skeletal primary tumors.
  • Tumor size or volume: Tumor size or volume has been shown to be an important prognostic factor in most studies. Cutoffs of a volume of 100 mL or 200 mL and/or single dimension greater than 8 cm are used to define larger tumors. Larger tumors tend to occur in unfavorable sites.
  • Age: Infants and younger patients have a better prognosis than do patients aged 15 years and older.

    In North American studies, patients younger than 10 years have a better outcome than those aged 10 to 17 years at diagnosis (relative risk [RR], 1.4). Patients older than 18 years have an inferior outcome (RR, 2.5). A retrospective review of two consecutive German trials for Ewing sarcoma identified 47 patients older than 40 years. With adequate multimodal therapy, survival was comparable to the survival observed in adolescents treated on the same trials. Review of the SEER database from 1973 to 2011 identified 1,957 patients with Ewing sarcoma. Thirty-nine of these patients (2.0%) were younger than 12 months at diagnosis. Infants were less likely to receive radiation therapy and more likely to have soft tissue primary sites. Early death was more common in infants, but the overall survival (OS) did not differ significantly from that of older patients.

  • Sex: Girls with Ewing sarcoma have a better prognosis than do boys with Ewing sarcoma.
  • Serum LDH: Increased serum LDH levels before treatment are associated with inferior prognosis. Increased LDH levels are also correlated with large primary tumors and metastatic disease.
  • Metastases: Any metastatic disease defined by standard imaging techniques or bone marrow aspirate/biopsy by morphology is an adverse prognostic factor. The presence or absence of metastatic disease is the single most powerful predictor of outcome. Metastases at diagnosis are detected in about 25% of patients.

    Patients with metastatic disease confined to the lung have a better prognosis than do patients with extrapulmonary metastatic sites. The number of pulmonary lesions does not seem to correlate with outcome, but patients with unilateral lung involvement do better than patients with bilateral lung involvement.

    Patients with metastasis to only bone seem to have a better outcome than do patients with metastases to both bone and lung.

    Based on an analysis from the SEER database, regional lymph node involvement in patients is associated with an inferior overall outcome when compared with patients without regional lymph node involvement.

  • Previous treatment for cancer: In the SEER database, 58 patients with Ewing sarcoma who were diagnosed after treatment for a previous malignancy (2.1% of patients with Ewing sarcoma) were compared with 2,756 patients with Ewing sarcoma as a first cancer over the same period. Patients with Ewing sarcoma as a second malignant neoplasm were older (secondary Ewing sarcoma, mean age of 47.8 years; primary Ewing sarcoma, mean age of 22.5 years), more likely to have a primary tumor in an axial or extraskeletal site, and had a worse prognosis (5-year OS for patients with secondary Ewing sarcoma, 43.5%; patients with primary Ewing sarcoma, 64.2%).
  • Standard cytogenetics: Complex karyotype (defined as the presence of five or more independent chromosome abnormalities at diagnosis) and modal chromosome numbers lower than 50 appear to have adverse prognostic significance.
  • Detectable fusion transcripts in morphologically normal marrow: Reverse transcriptase polymerase chain reaction can be used to detect fusion transcripts in bone marrow. In a single retrospective study utilizing patients with normal marrow morphology and no other metastatic site, fusion transcript detection in marrow or peripheral blood was associated with an increased risk of relapse.
  • Other biological factors: Overexpression of the p53 protein, Ki67 expression, and loss of 16q may be adverse prognostic factors. High expression of microsomal glutathione S-transferase, an enzyme associated with resistance to doxorubicin, is associated with inferior outcome for Ewing sarcoma.

    The Children's Oncology Group performed a prospective analysis of mutations and/or deletions in patients with Ewing sarcoma; no correlation was found with event-free survival (EFS).

The following are not considered to be adverse prognostic factors for Ewing sarcoma:

  • Pathologic fracture: Pathologic fractures do not appear to be a prognostic factor.
  • Histopathology: The degree of neural differentiation is not a prognostic factor in Ewing sarcoma.
  • Molecular pathology: The translocation associated with Ewing sarcoma can occur at several potential breakpoints in each of the genes that join to form the novel segment of DNA. Once thought to be significant, two large series have shown that the translocation breakpoint site is not an adverse prognostic factor.

Response to initial therapy factors

Multiple studies have shown that patients with minimal or no residual viable tumor after presurgical chemotherapy have a significantly better EFS than do patients with larger amounts of viable tumor. Female sex and younger age predict a good histologic response to preoperative therapy. For patients who receive preinduction- and postinduction-chemotherapy PET scans, decreased PET uptake after chemotherapy correlated with good histologic response and better outcome.

Patients with poor response to presurgical chemotherapy have an increased risk for local recurrence.

Cellular Classification of Ewing Sarcoma

Ewing sarcoma belongs to the group of neoplasms commonly referred to as small, round, blue-cell tumors of childhood. The individual cells of Ewing sarcoma contain round-to-oval nuclei, with fine dispersed chromatin without nucleoli. Occasionally, cells with smaller, more hyperchromatic, and probably degenerative nuclei are present, giving a light cell/dark cell pattern. The cytoplasm varies in amount, but in the classic case, it is clear and contains glycogen, which can be highlighted with a periodic acid-Schiff stain. The tumor cells are tightly packed and grow in a diffuse pattern without evidence of structural organization. Tumors with the requisite translocation that show neuronal differentiation are not considered a separate entity, but rather, part of a continuum of differentiation.

The gene product, CD99, is a surface membrane protein that is expressed in most cases of Ewing sarcoma and is useful in diagnosing these tumors when the results are interpreted in the context of clinical and pathologic parameters. positivity is not unique to Ewing sarcoma, and positivity by immunochemistry is found in several other tumors, including synovial sarcoma, non-Hodgkin lymphoma, and gastrointestinal stromal tumors.

Genomics of Ewing Sarcoma

The detection of a translocation involving the gene on chromosome 22 band q12 and any one of a number of partner chromosomes is the key feature in the diagnosis of Ewing sarcoma (refer to Table 2). The gene is a member of the TET family [TLS/EWS/TAF15] of RNA-binding proteins. The gene is a member of the ETS family of DNA-binding genes. Characteristically, the amino terminus of the gene is juxtaposed with the carboxy terminus of the family gene. In most cases (90%), the carboxy terminus is provided by , a member of the family of transcription factor genes located on chromosome 11 band q24. Other family members that may combine with the gene are , , (also termed ), and . Rarely, , another TET family member, can substitute for . Finally, there are a few rare cases in which has translocated with partners that are not members of the family of oncogenes. The significance of these alternate partners is not known.

Besides these consistent aberrations involving the gene at 22q12, additional numerical and structural aberrations have been observed in Ewing sarcoma, including gains of chromosomes 2, 5, 8, 9, 12, and 15; the nonreciprocal translocation t(1;16)(q12;q11.2); and deletions on the short arm of chromosome 6. Trisomy 20 may be associated with a more aggressive subset of Ewing sarcoma.

Three papers have described the genomic landscape of Ewing sarcoma and all show that these tumors have a relatively silent genome, with a paucity of mutations in pathways that might be amenable to treatment with novel targeted therapies. These papers also identified mutations in , a member of the cohesin complex, in about 15% to 20% of the cases, and the presence of these mutations was associated with advanced-stage disease. deletions were noted in 12% to 22% of cases. Finally, mutations were identified in about 6% to 7% of cases and the coexistence of and mutations is associated with a poor clinical outcome.

Figure 1 below from a discovery cohort (n = 99) highlights the frequency of chromosome 8 gain, the co-occurrence of chromosome 1q gain and chromosome 16q loss, the mutual exclusivity of deletion and mutation, and the relative paucity of recurrent single nucleotide variants for Ewing sarcoma.

Chart showing a comprehensive profile of the genetic abnormalities in Ewing sarcoma and associated clinical information.Figure 1. A comprehensive profile of the genetic abnormalities in Ewing sarcoma and associated clinical information. Key clinical characteristics are indicated, including primary site, type of tissue, and metastatic status at diagnosis, follow-up, and last news. Below is the consistency of detection of gene fusions by RT-PCR and whole-genome sequencing (WGS). The numbers of structural variants (SV) and single-nucleotide variants (SNV) as well as indels are reported in grayscale. The presence of the main copy-number changes, chr 1q gain, chr 16 loss, chr 8 gain, chr 12 gain, and interstitial CDKN2A deletion is indicated. Listed last are the most significant mutations and their types. For gene mutations, “others” refers to: duplication of exon 22 leading to frameshift (STAG2), deletion of exon 2 to 11 (BCOR), and deletion of exons 1 to 6 (ZMYM3). Reprinted from Cancer Discovery, Copyright 2014, 4 (11), 1342–53, Tirode F, Surdez D, Ma X, et al., Genomic Landscape of Ewing Sarcoma Defines an Aggressive Subtype with Co-Association of STAG2 and TP53 mutations, with permission from AACR.

Ewing sarcoma translocations can all be found with standard cytogenetic analysis. A more rapid analysis looking for a break apart of the gene is now frequently done to confirm the diagnosis of Ewing sarcoma molecularly. This test result must be considered with caution, however. Ewing sarcomas that utilize the translocations will have negative tests because the gene is not translocated in those cases. In addition, other small round tumors also contain translocations of different family members with , such as desmoplastic small round cell tumor, clear cell sarcoma, extraskeletal myxoid chondrosarcoma, and myxoid liposarcoma, all of which may be positive with a fluorescence hybridization (FISH) break-apart probe. A detailed analysis of 85 patients with small round blue cell tumors that were negative for rearrangement by FISH with an break-apart probe identified eight patients with rearrangements. Four patients who had fusions were not detected by FISH with an break-apart probe. The authors do not recommend relying solely on break-apart probes for analyzing small round blue cell tumors with strong immunohistochemical positivity for CD99.

Small round blue cell tumors of bone and soft tissue that are histologically similar to Ewing sarcoma but do not have rearrangements of the gene have been analyzed and translocations have been identified. These include , , and . The molecular profile of these tumors is different from the profile of translocated Ewing sarcoma, and limited evidence suggests that they have a different clinical behavior. In almost all cases, the patients were treated with therapy designed for Ewing sarcoma on the basis of the histologic and immunohistologic similarity to Ewing sarcoma. There are too few cases associated with each translocation to determine whether the prognosis for these small round blue cell tumors is distinct from the prognosis of Ewing sarcoma of similar stage and site.

A genome-wide association study identified a region on chromosome 10q21.3 associated with an increased risk of Ewing sarcoma. Deep sequencing through this region identified a polymorphism in the gene, which appears to cooperate with the gene product of the fusion that is seen in most patients with Ewing sarcoma. The polymorphism associated with the increased risk is found at a much higher frequency in whites than in blacks or Asians, possibly contributing to the epidemiology of the relative infrequency of Ewing sarcoma in the latter populations.

Stage Information for Ewing Sarcoma

Pretreatment staging studies for Ewing sarcoma may include the following:

  • Magnetic resonance imaging (MRI).
  • Computed tomography (CT) scan of the primary site and chest.
  • Positron emission tomography using fluorine F 18-fludeoxyglucose (18F-FDG PET) or 18F-FDG PET-CT.
  • Bone scan.
  • Bone marrow aspiration and biopsy.

For patients with confirmed Ewing sarcoma, pretreatment staging studies include MRI and/or CT scan, depending on the primary site. Despite the fact that CT and MRI are both equivalent in terms of staging, use of both imaging modalities may help radiation therapy planning. Whole-body MRI may provide additional information that could potentially alter therapy planning. Additional pretreatment staging studies include bone scan and CT scan of the chest. In certain studies, determination of pretreatment tumor volume is an important variable.

Although 18F-FDG PET or 18F-FDG PET-CT are optional staging modalities, they have demonstrated high sensitivity and specificity in Ewing sarcoma and may provide additional information that alters therapy planning. In one institutional study, 18F-FDG PET had a very high correlation with bone scan; the investigators suggested that it could replace bone scan for the initial extent of disease evaluation. This finding was confirmed in a single-institution retrospective review. 18F-FDG PET-CT is more accurate than 18F-FDG PET alone in Ewing sarcoma.

Bone marrow aspiration and biopsy have been considered the standard of care for Ewing sarcoma. However, two retrospective studies showed that for patients (N = 141 total) who were evaluated by bone scan and/or PET scan and lung CT without evidence of metastases, bone marrow aspirates and biopsies were negative in every case. The need for routine use of bone marrow aspirates and biopsies in patients without bone metastases is now in question.

For Ewing sarcoma, the tumor is defined as localized when, by clinical and imaging techniques, there is no spread beyond the primary site or regional lymph node involvement. Continuous extension into adjacent soft tissue may occur. If there is a question of regional lymph node involvement, pathologic confirmation is indicated.

Treatment Option Overview for Ewing Sarcoma

It is important that patients be evaluated by specialists from the appropriate disciplines (e.g., radiologists, chemotherapists, pathologists, surgical or orthopedic oncologists, and radiation oncologists) as early as possible. Appropriate imaging studies of the site are obtained before biopsy. To ensure that the incision is placed in an acceptable location, the surgical or orthopedic oncologist who will perform the definitive surgery is involved in the decision regarding biopsy-incision placement. This is especially important if it is thought that the lesion can be totally excised or if a limb salvage procedure may be attempted. Biopsy should be from soft tissue as often as possible to avoid increasing the risk of fracture. The pathologist is consulted before biopsy/surgery to ensure that the incision will not compromise the radiation port and that multiple types of adequate tissue samples are obtained. It is important to obtain fresh tissue, whenever possible, for cytogenetics and molecular pathology. A second option is to perform a needle biopsy, as long as adequate tissue is obtained for molecular biology and cytogenetics.

Table 3 describes the treatment options for localized, metastatic, and recurrent Ewing sarcoma.

The successful treatment of patients with Ewing sarcoma requires systemic chemotherapy in conjunction with surgery and/or radiation therapy for local tumor control. In general, patients receive chemotherapy before instituting local-control measures. In patients who undergo surgery, surgical margins and histologic response are considered in planning postoperative therapy. Patients with metastatic disease often have a good initial response to preoperative chemotherapy, but in most cases, the disease is only partially controlled or recurs. Patients with lung as the only metastatic site have a better prognosis than do patients with metastases to bone and/or bone marrow. Adequate local control for metastatic sites, particularly bone metastases, may be an important issue.

Chemotherapy for Ewing Sarcoma

Multidrug chemotherapy for Ewing sarcoma always includes vincristine, doxorubicin, ifosfamide, and etoposide. Most protocols also use cyclophosphamide and some incorporate dactinomycin. The mode of administration and dose intensity of cyclophosphamide within courses differs markedly between protocols. A European Intergroup Cooperative Ewing Sarcoma Study (EICESS) trial suggested that 1.2 g of cyclophosphamide produced a similar event-free survival (EFS) compared with 6 g of ifosfamide in patients with lower-risk disease, and identified a trend toward better EFS for patients with localized Ewing sarcoma and higher-risk disease when treatment included etoposide ().[]

Protocols in the United States generally alternate courses of vincristine, cyclophosphamide, and doxorubicin with courses of ifosfamide/etoposide, while European protocols generally combine vincristine, doxorubicin, and an alkylating agent with or without etoposide in a single treatment cycle. The duration of primary chemotherapy ranges from 6 months to approximately 1 year.

Evidence (chemotherapy):

Local Control for Ewing Sarcoma

Treatment approaches for Ewing sarcoma titrate therapeutic aggressiveness with the goal of maximizing local control while minimizing morbidity.

Surgery is the most commonly used form of local control. Radiation therapy is an effective alternative modality for local control in cases where the functional morbidity of surgery is deemed too high by experienced surgical oncologists. However, in the immature skeleton, radiation therapy can cause subsequent deformities that may be more morbid than deformities from surgery. When complete surgical resection with pathologically negative margins cannot be obtained, postoperative radiation therapy is indicated. A multidisciplinary discussion between the experienced radiation oncologist and the surgeon is necessary to determine the best treatment options for local control for a given case. For some marginally resectable lesions, a combined approach of preoperative radiation therapy followed by resection can be used.

Randomized trials that directly compare surgery and radiation therapy do not exist, and their relative roles remain controversial. Although retrospective institutional series suggest superior local control and survival with surgery than with radiation therapy, most of these studies are compromised by selection bias. An analysis using propensity scoring to adjust for clinical features that may influence the preference for surgery only, radiation only, or combined surgery and radiation demonstrated that similar EFS is achieved with each mode of local therapy after propensity adjustment. Data for patients with pelvic primary Ewing sarcoma from a North American intergroup trial showed no difference in local control or survival on the basis of local-control modality—surgery alone, radiation therapy alone, or radiation plus surgery.

For patients who undergo gross-total resection with microscopic residual disease, the value of adjuvant radiation therapy is controversial. Investigations addressing this issue are retrospective and nonrandomized, limiting their value.

Evidence (postoperative radiation therapy):

In summary, surgery is chosen as definitive local therapy for suitable patients, but radiation therapy is appropriate for patients with unresectable disease or those who would experience functional compromise by definitive surgery. The possibility of impaired function needs to be measured against the possibility of second tumors in the radiation field (refer to the Late Effects of Treatment for Ewing Sarcoma section of this summary for more information). Adjuvant radiation therapy may be considered for patients with residual microscopic disease, inadequate margins, or who have viable tumor in the resected specimen and close margins.

When preoperative assessment has suggested a high probability that surgical margins will be close or positive, preoperative radiation therapy has achieved tumor shrinkage and allowed surgical resection with clear margins.

High-Dose Therapy With Stem Cell Rescue for Ewing Sarcoma

For patients with a high risk of relapse with conventional treatments, certain investigators have utilized high-dose chemotherapy with hematopoietic stem cell transplant (HSCT) as consolidation treatment, in an effort to improve outcome.

Evidence (high-dose therapy with stem cell rescue):

The role of high-dose therapy followed by stem cell rescue is being investigated in the prospective, randomized Euro-Ewing trial () for patients who present with metastases and patients with localized tumors with poor response to initial chemotherapy.

Ewing Sarcoma/Specific Sites

Multiple analyses have evaluated diagnostic findings, treatment, and outcome of patients with bone lesions at the following anatomic primary sites:

  • Pelvis.
  • Femur.
  • Humerus.
  • Hand and foot.
  • Chest wall/rib.
  • Head and neck.
  • Spine/sacrum.

Extraosseous Ewing Sarcoma

Extraosseous Ewing sarcoma is biologically similar to Ewing sarcoma arising in bone. Historically, most children and young adults with extraosseous Ewing sarcoma were treated on protocols designed for the treatment of rhabdomyosarcoma. This is important because many of the treatment regimens for rhabdomyosarcoma do not include an anthracycline, which is a critical component of current treatment regimens for Ewing sarcoma. Currently, patients with extraosseous Ewing sarcoma are eligible for studies that include Ewing sarcoma of bone.

From 1987 to 2004, 111 patients with nonmetastatic extraosseous Ewing sarcoma were enrolled on the RMS-88 and RMS-96 protocols. Patients with initial complete tumor resection received ifosfamide, vincristine, and actinomycin (IVA) while patients with residual tumor received IVA plus doxorubicin (VAIA) or IVA plus carboplatin, epirubicin, and etoposide (CEVAIE). Seventy-six percent of patients received radiation. The 5-year EFS was 59% and OS was 69%. In a multivariate analysis, independent adverse prognostic factors included axial primary, tumor size greater than 10 cm, Intergroup Rhabdomyosarcoma Studies Group III, and lack of radiation therapy.

Two hundred thirty-six patients with extraosseous Ewing sarcoma were entered on studies of the German Pediatric Oncology Group. The median age at diagnosis was 15 years and 133 patients were male. Primary tumor site was either extremity (n = 62) or central site (n = 174). Sixty of the 236 patients had metastases at diagnosis. Chemotherapy consisted of vincristine, doxorubicin, cyclophosphamide, and actinomycin (VACA); CEVAIE; or VIDE. The 5-year EFS was 49% and OS was 60%. Five-year survival was 70% for patients with localized disease and 33% for patients with metastasis at diagnosis. OS in patients with localized disease did not seem related to tumor site or size. In a retrospective French study, patients with extraosseous Ewing sarcoma were treated using a rhabdomyosarcoma regimen (no anthracyclines) or a Ewing sarcoma regimen (includes anthracyclines). Patients who received the anthracycline-containing regimen had a significantly better EFS and OS than did patients who did not receive anthracyclines. Two North American Ewing sarcoma trials have included patients with extraosseous Ewing sarcoma. In a review of data from the POG-9354 (INT-0154) and studies, 213 patients with extraosseous Ewing sarcoma and 826 patients with Ewing sarcoma of bone were identified. The hazard ratio of extraosseous Ewing sarcoma was superior (0.62), and extraosseous Ewing sarcoma was a favorable risk factor, independent of age, race, and primary site.[]

Cutaneous Ewing sarcoma is a soft tissue tumor in the skin or subcutaneous tissue that seems to behave as a less-aggressive tumor than primary bone or soft tissue Ewing sarcoma. Tumors can form throughout the body, although the extremity is the most common site, and they are almost always localized. In a review of 78 reported cases, some lacking molecular confirmation, the OS was 91%. Adequate local control, defined as a complete resection with negative margins, radiation therapy, or a combination, significantly reduced the incidence of relapse. Standard chemotherapy for Ewing sarcoma is often used for these patients because there are no data to suggest which patients could be treated less aggressively. A series of 56 patients with cutaneous or subcutaneous Ewing sarcoma confirmed the excellent outcome with the use of standard systemic therapy and local control. Attempted primary definitive surgery often resulted in the need for either radiation therapy or more function-compromising surgery, supporting the recommendation of biopsy only as initial surgery, rather than upfront unplanned resection.[]

Special Considerations for the Treatment of Children With Cancer

Cancer in children and adolescents is rare, although the overall incidence of childhood cancer has been slowly increasing since 1975. Children and adolescents with cancer should be referred to medical centers that have a multidisciplinary team of cancer specialists with experience treating the cancers that occur during childhood and adolescence. This multidisciplinary team approach incorporates the skills of the following health care professionals and others to ensure that children receive treatment, supportive care, and rehabilitation that will achieve optimal survival and quality of life:

  • Primary care physicians.
  • Pediatric surgeons.
  • Radiation oncologists.
  • Pediatric oncologists/hematologists.
  • Rehabilitation specialists.
  • Pediatric nurse specialists.
  • Social workers.
  • Child-life professionals.
  • Psychologists.

(Refer to the PDQ Supportive and Palliative Care summaries for specific information about supportive care for children and adolescents with cancer.)

Guidelines for pediatric cancer centers and their role in the treatment of pediatric patients with cancer have been outlined by the American Academy of Pediatrics. At these pediatric cancer centers, clinical trials are available for most types of cancer that occur in children and adolescents, and the opportunity to participate in these trials is offered to most patients and their families. Clinical trials for children and adolescents with cancer are generally designed to compare potentially better therapy with therapy that is currently accepted as standard. Most of the progress made in identifying curative therapies for childhood cancers has been achieved through clinical trials. Information about ongoing clinical trials is available from the NCI website.

Childhood and adolescent cancer survivors require close monitoring because cancer therapy side effects may persist or develop months or years after treatment. (Refer to the PDQ summary on Late Effects of Treatment for Childhood Cancer for specific information about the incidence, type, and monitoring of late effects in childhood and adolescent cancer survivors.)

Treatment of Localized Ewing Sarcoma

Standard Treatment Options for Localized Ewing Sarcoma

Standard treatment options for localized Ewing sarcoma include the following:

Because most patients with apparently localized disease at diagnosis have occult metastatic disease, multidrug chemotherapy and local disease control with surgery and/or radiation therapy is indicated in the treatment of all patients. Current regimens for the treatment of localized Ewing sarcoma achieve event-free survival (EFS) and overall survival (OS) of approximately 70% at 5 years after diagnosis.


Current standard chemotherapy in the United States includes vincristine, doxorubicin, and cyclophosphamide (VDC), alternating with ifosfamide and etoposide (IE) or VDC/IE.; []

Evidence (chemotherapy):

In a Children's Oncology Group (COG) trial (), 568 patients with newly diagnosed localized extradural Ewing sarcoma were randomly assigned to receive chemotherapy (VDC/IE) given either every 2 weeks (interval compression) or every 3 weeks (standard). Patients randomly assigned to the every 2-week interval of treatment had an improved 5-year EFS (73% vs. 65%, = .048). There was no increase in toxicity observed with the every 2-week schedule.

Local-control measures

Local control can be achieved by surgery and/or radiation therapy.


Surgery is generally the preferred approach if the lesion is resectable. The superiority of resection for local control has never been tested in a prospective randomized trial. The apparent superiority may represent selection bias.

Potential benefits of surgery include the following:

  • If a very young child has Ewing sarcoma, surgery may be a less-morbid therapy than radiation therapy because of the retardation of bone growth caused by radiation.
  • Another potential benefit for surgical resection of the primary tumor is related to the amount of necrosis in the resected tumor. Patients with residual viable tumor in the resected specimen have a worse outcome than those with complete necrosis. In a French Ewing study (EW88), EFS for patients with less than 5% viable tumor was 75%, EFS for patients with 5% to 30% viable tumor was 48%, and EFS for patients with more than 30% viable tumor was 20%.

European investigators are studying whether treatment intensification (i.e., high-dose chemotherapy with stem cell rescue) will improve outcome for patients with a poor histologic response.

Radiation therapy is usually employed in the following cases:

  • Patients who do not have a surgical option that preserves function.
  • Patients whose tumors have been excised but with inadequate margins.

Pathologic fracture at the time of diagnosis does not preclude surgical resection and is not associated with adverse outcome.

Radiation therapy

Radiation therapy is delivered in a setting in which stringent planning techniques are applied by those experienced in the treatment of Ewing sarcoma. Such an approach will result in local control of the tumor with acceptable morbidity in most patients.

The radiation dose may be adjusted depending on the extent of residual disease after the initial surgical procedure. Radiation therapy is generally administered in fractionated doses totaling approximately 55.8 Gy to the prechemotherapy tumor volume. A randomized study of 40 patients with Ewing sarcoma using 55.8 Gy to the prechemotherapy tumor extent with a 2-cm margin compared with the same total-tumor dose after 39.6 Gy to the entire bone showed no difference in local control or EFS. Hyperfractionated radiation therapy has not been associated with improved local control or decreased morbidity.

Comparison of proton-beam radiation therapy and intensity-modulated radiation therapy (IMRT) treatment plans has shown that proton-beam radiation therapy can spare more normal tissue adjacent to Ewing sarcoma primary tumors than IMRT. Follow-up remains relatively short, and there are no data available to determine whether the reduction in dose to adjacent tissue will result in improved functional outcome or reduce the risk of secondary malignancy. Because patient numbers are small and follow-up is relatively short, it is not possible to determine whether the risk of local recurrence might be increased by reducing radiation dose in tissue adjacent to the primary tumor.

Higher rates of local failure are seen in patients older than 14 years who have tumors more than 8 cm in length. A retrospective analysis of patients with Ewing sarcoma of the chest wall compared patients who received hemithorax radiation therapy with those who received radiation therapy to the chest wall only. Patients with pleural invasion, pleural effusion, or intraoperative contamination were assigned to hemithorax radiation therapy. EFS was longer for patients who received hemithorax radiation, but the difference was not statistically significant. In addition, most patients with primary vertebral tumors did not receive hemithorax radiation and had a lower probability for EFS.

For patients with residual disease after an attempt at surgical resection, the Intergroup Ewing Sarcoma Study (INT-0091) recommended 45 Gy to the original disease site plus a 10.8 Gy boost for patients with gross residual disease and 45 Gy plus a 5.4 Gy boost for patients with microscopic residual disease. No radiation therapy was recommended for those who have no evidence of microscopic residual disease after surgical resection.

Radiation therapy is associated with the development of subsequent neoplasms. A retrospective study noted that patients who received 60 Gy or more had an incidence of second malignancy of 20%. Those who received 48 Gy to 60 Gy had an incidence of 5%, and those who received less than 48 Gy did not develop a second malignancy. (Refer to the Late Effects of Treatment for Ewing Sarcoma section of this summary for more information.)

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

Treatment of Metastatic Ewing Sarcoma

Metastases at diagnosis are detected in approximately 25% of patients. The prognosis of patients with metastatic disease is poor. Current therapies for patients who present with metastatic disease achieve 6-year event-free survival (EFS) of approximately 28% and overall survival (OS) of approximately 30%. For patients with lung/pleural metastases only, 6-year EFS is approximately 40% when utilizing bilateral lung irradiation. In contrast, patients with bone/bone marrow metastases have a 4-year EFS of approximately 28% and patients with combined lung and bone/bone marrow metastases have a 4-year EFS of approximately 14%.

The following factors independently predict a poor outcome in patients presenting with metastatic disease:

  • Age older than 14 years.
  • Primary tumor volume of more than 200 mL.
  • More than one bone metastatic site.
  • Bone marrow metastases.
  • Additional lung metastases.

Standard Treatment Options for Metastatic Ewing Sarcoma

Standard treatment options for metastatic Ewing sarcoma include the following:


Standard treatment for patients with metastatic Ewing sarcoma utilizing alternating vincristine, doxorubicin, cyclophosphamide, and ifosfamide/etoposide combined with adequate local-control measures applied to both primary and metastatic sites often results in complete or partial responses; however, the overall cure rate is 20%.

The following chemotherapy regimens have not shown benefit:

  • In the Intergroup Ewing Sarcoma Study, patients with metastatic disease showed no benefit from the addition of ifosfamide and etoposide to a standard regimen of vincristine, doxorubicin, cyclophosphamide, and dactinomycin.
  • In another Intergroup study, increasing dose intensity of cyclophosphamide, ifosfamide, and doxorubicin did not improve outcome compared with regimens utilizing standard-dose intensity. This regimen increased toxicity and risk of second malignancy without improving EFS or OS.
  • Intensification of ifosfamide to 2.8 g/m per day for 5 days did not improve outcome when administered with standard chemotherapy in patients with newly diagnosed metastatic Ewing sarcoma.[]

Surgery and radiation therapy

Systematic use of surgery and radiation therapy for metastatic sites may improve overall outcome in patients with extrapulmonary metastases.

Evidence (surgery and radiation therapy):

Radiation therapy, delivered in a setting in which stringent planning techniques are applied by those experienced in the treatment of Ewing sarcoma, should be considered. Such an approach will result in local control of tumor with acceptable morbidity in most patients.

The radiation dose depends on the metastatic site of disease:

  • Bone and soft tissue. Stereotactic body radiation therapy has been used to treat metastatic sites in bone and soft tissue. The median total curative/definitive stereotactic body radiation therapy dose delivered was 40 Gy in five fractions (range, 30–60 Gy in 3–10 fractions). The median total palliative stereotactic body radiation therapy dose delivered was 40 Gy in five fractions (range, 16–50 Gy in 1–10 fractions). These short-course regimens with large-dose fractions are biologically equivalent to higher doses delivered with smaller-dose fractions given over longer treatment courses.[]
  • Pulmonary. For all patients with pulmonary metastases, whole-lung irradiation should be considered, even if complete resolution of overt pulmonary metastatic disease has been achieved with chemotherapy. Radiation doses are modulated based on the amount of lung to be irradiated and on pulmonary function. Doses between 12 Gy and 15 Gy are generally used if whole lungs are treated.

Other therapies

More intensive therapies, many of which incorporate high-dose chemotherapy with or without total-body irradiation in conjunction with stem cell support, have not shown improvement in EFS rates for patients with bone and/or bone marrow metastases.; [] (Refer to the High-Dose Therapy With Stem Cell Rescue for Ewing Sarcoma section of this summary for more information.)

  • High-dose chemotherapy with stem cell support. One of the largest studies was the R3 trial that enrolled 281 patients with primary disseminated metastatic Ewing sarcoma. Patients were treated with six cycles of vincristine, ifosfamide, doxorubicin, and etoposide followed by high-dose therapy and autologous stem cell transplant and demonstrated a 3-year EFS of 27% and OS of 34%. Factors such as the presence and number of bone lesions, primary tumor volume greater than 200 mL, age older than 14 years, additional pulmonary metastases, and bone marrow involvement were identified as independent prognostic factors.[] The impact of high-dose chemotherapy with peripheral blood stem cell support for patients with isolated lung metastases is unknown and is being studied in the trial, for which results are pending.
  • Melphalan. Melphalan, at nonmyeloablative doses, proved to be an active agent in an upfront window study for patients with metastatic disease at diagnosis; however, the cure rate remained extremely low.
  • Irinotecan. Irinotecan was administered as a single agent in an upfront window for newly diagnosed metastatic Ewing sarcoma patients and showed modest activity (partial response in 5 of 24 patients).[] Further investigation is needed to determine irinotecan dosing and combinations with other agents for patients with Ewing sarcoma.

Treatment Options Under Clinical Evaluation for Metastatic Ewing Sarcoma

Information about National Cancer Institute (NCI)–supported clinical trials can be found on the NCI website. For information about clinical trials sponsored by other organizations, refer to the website.

The following is an example of a national and/or institutional clinical trial that is currently being conducted:

  • (Combination Chemotherapy With or Without Ganitumab in Treating Patients With Newly Diagnosed Metastatic Ewing Sarcoma): This phase II study is randomly assigning newly diagnosed patients with metastatic Ewing sarcoma to multiagent chemotherapy (vincristine, doxorubicin, cyclophosphamide, ifosfamide, and etoposide) with or without the addition of ganitumab (AMG 479). Stereotactic body radiation therapy is being evaluated to sites of bone metastases at a dose of 40 Gy in five fractions. This is a shorter course of therapy than is the standard treatment.

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

Treatment of Recurrent Ewing Sarcoma

Recurrence of Ewing sarcoma is most common within 2 years of initial diagnosis (approximately 80%). However, late relapses occurring more than 5 years from initial diagnosis are more common in Ewing sarcoma (13%; 95% confidence interval, 9.4–16.5) than in other pediatric solid tumors. An analysis of the Surveillance, Epidemiology, and End Results database identified 1,351 patients who survived more than 60 months from diagnosis. Of these patients, 209 died, with 144 of the deaths (69%) attributed to recurrent, progressive Ewing sarcoma. Black race, male sex, older age at initial diagnosis, and primary tumors of the pelvis and axial skeleton were associated with a higher risk of late death. This analysis covered the period from 1973 to 2013, and the 1,351 patients represented only 38% of the patients in the original sample, which reflects the inferior treatment outcomes from the earlier era. It is possible that patients who reach the 5-year point after more contemporary treatment may not recapitulate this experience.

The overall prognosis for patients with recurrent Ewing sarcoma is poor; 5-year survival after recurrence is approximately 10% to 15%.; []

Prognostic factors include the following:

  • Time to recurrence. Time to recurrence is the most important prognostic factor. Patients whose Ewing sarcoma recurred more than 2 years from initial diagnosis had a 5-year survival of 30% versus 7% for patients whose Ewing sarcoma recurred within 2 years.
  • Local and distant recurrence. Patients with both local recurrence and distant metastases have a worse outcome than do patients with either isolated local recurrence or metastatic recurrence alone.
  • Isolated pulmonary recurrence. Isolated pulmonary recurrence was not an important prognostic factor in a North American series. In the Italian/Scandinavian experience, younger age, longer disease-free interval, and lung-only recurrence were associated with longer progression-free survival after recurrence. In this experience, patients with Ewing sarcoma that recurred after initial therapy, which included high-dose therapy with autologous stem cell rescue, were less likely to achieve a second complete remission.[]

Treatment Options for Recurrent Ewing Sarcoma

The selection of treatment for patients with recurrent disease depends on many factors, including the following:

  • Site of recurrence.
  • Previous treatment.
  • Individual patient considerations.

There is no standardized second-line treatment for relapsed or refractory Ewing sarcoma.

Treatment options for recurrent Ewing sarcoma include the following:


Combinations of chemotherapy, such as cyclophosphamide and topotecan or irinotecan and temozolomide with or without vincristine, are active in recurrent Ewing sarcoma and can be considered for these patients.

Evidence (chemotherapy):

Radiation therapy

Radiation therapy to bone lesions may provide palliation, although radical resection may improve outcome. Patients with pulmonary metastases who have not received radiation therapy to the lungs should be considered for whole-lung irradiation. Residual disease in the lung may be surgically removed.

Other therapies

Other therapies that have been studied in the treatment of recurrent Ewing sarcoma include the following:

  • High-dose chemotherapy with stem cell support. Aggressive attempts to control the disease, including myeloablative regimens, have been used, but there is no evidence at this time to conclude that myeloablative therapy is superior to standard chemotherapy.; []; []

    Most published reports about the use of high-dose therapy and stem cell support for patients with high-risk Ewing sarcoma have significant flaws in methodology. The most common error is the comparison of this high-risk group with an inappropriate control group. Patients with Ewing sarcoma at high risk of treatment failure who received high-dose therapy are compared with patients who did not receive high-dose therapy. Patients who undergo high-dose therapy must respond to systemic therapy, remain alive and respond to treatment long enough to reach the time at which stem cell therapy can be applied, be free of comorbid toxicity that precludes high-dose therapy, and have an adequate stem cell collection. Patients who undergo high-dose therapy and stem cell support are a highly selected group; comparing this patient group with all patients with high-risk Ewing sarcoma is inappropriate and leads to the erroneous conclusion that this strategy improves outcome. Surveys of patients undergoing allogeneic stem cell transplantation (SCT) for recurrent Ewing sarcoma did not show improved event-free survival when compared with autologous SCT and was associated with a higher complication rate.

  • Monoclonal antibody therapy. Monoclonal antibodies against the insulin-like growth factor 1 receptor (IGF1R) are reported to produce objective responses in metastatic recurrent Ewing sarcoma in roughly 10% of cases.[] In these studies, it was suggested that time-to-progression was prolonged compared with historical controls. Objective responses have been reported in studies combining the mTOR inhibitor temsirolimus with an IGF1R antibody. Stratification by IGF1R expression by immunohistochemistry in one of the studies did not predict clinical outcome in Ewing sarcoma patients. Further studies are needed to identify patients who are likely to benefit from IGF1R therapy.
  • Immunotherapy. Immunotherapy with antigen-specific T cells is being studied in patients with Ewing sarcoma because immune-mediated killing does not rely on pathways used by conventional therapies to which such tumors are often resistant. Several potential chimeric antigen receptors target antigens that have been identified for Ewing sarcomas. These include HER2 (human epidermal growth factor receptor 2), GD2, CD99 (MIC2 antigens), and STEAP1 (six-transmembrane epithelial antigens of the prostate). Some are in early-phase testing in sarcoma patients.

Treatment Options Under Clinical Evaluation for Recurrent Ewing Sarcoma

Information about National Cancer Institute (NCI)–supported clinical trials can be found on the NCI website. For information about clinical trials sponsored by other organizations, refer to the website.

The following are examples of national and/or institutional clinical trials that are currently being conducted:

  • (Pediatric MATCH: Targeted Therapy Directed by Genetic Testing in Treating Pediatric Patients with Relapsed or Refractory Advanced Solid Tumors, Non-Hodgkin Lymphomas, or Histiocytic Disorders): NCI–Children's Oncology Group Pediatric Molecular Analysis for Therapeutic Choice (MATCH), referred to as Pediatric MATCH, will match targeted agents with specific molecular changes identified using a next-generation sequencing targeted assay of more than 3,000 different mutations across more than 160 genes in refractory and recurrent solid tumors. Children and adolescents aged 1 to 21 years are eligible for the trial.

    Tumor tissue from progressive or recurrent disease must be available for molecular characterization. Patients with tumors that have molecular variants addressed by treatment arms included in the trial will be offered treatment on Pediatric MATCH. Additional information can be obtained on the website for APEC1621 (NCT03155620).

  • ADVL1622 (NCT02867592) (Cabozantinib-S-Malate in Treating Younger Patients with Recurrent, Refractory, or Newly Diagnosed Sarcomas, Wilms Tumor, or Other Rare Tumors): This is an open-label, two-stage, phase II trial of cabozantinib in selective solid tumors, including Ewing sarcoma. Cabozantinib is an oral small molecule inhibitor of multiple tyrosine kinases, including MET, VEGFR2, and RET, which are potential therapeutic targets in many pediatric and adult solid tumors.
  • (A Phase II Study of the Anti-PD1 Antibody Pembrolizumab [MK-3475] in Patients With Advanced Sarcomas): The objective response rate to the anti-PD1 inhibitor pembrolizumab will be assessed in patients with refractory, recurrent, and/or metastatic high-grade soft tissue sarcomas and bone sarcomas. Patients aged 18 years and older with soft tissue sarcomas and patients aged 12 years and older with bone sarcomas are eligible.
  • (Nivolumab With or Without Ipilimumab in Treating Younger Patients With Recurrent or Refractory Solid Tumors or Sarcomas): Nivolumab is an anti-PD1 inhibitor that is being studied alone and in combination with ipilimumab in relapsed sarcoma patients, including patients with Ewing sarcoma.
  • (BMN-673 and Temozolomide in Treating Younger Patients With Refractory or Recurrent Malignancies): In this study, the PARP inhibitor BMN-673 is combined with low-dose short duration temozolomide. This is based on the and mouse human tumor xenograft models, which showed impressive activity in a broad range of pediatric cancers, including Ewing sarcoma. After identifying the recommended phase II dose, this study is open for Ewing sarcoma patients.
  • ADVL1615 (NCT03323034) (Pevonedistat, Irinotecan Hydrochloride, and Temozolomide in Treating Patients With Recurrent or Refractory Solid Tumors or Lymphoma): This is a phase I study of pevonedistat in combination with temozolomide and irinotecan. Pevonedistat is a novel first-in-class Nedd8 activating enzyme (NAE) inhibitor that blocks the degradation of a subset of proteins that would normally be degraded by the 26S proteasome. Pevonedistat is more specific than previous proteasome inhibitors because it blocks the degradation of cullin-RING ligases, narrowing the targets to only a handful of key regulatory proteins important in cell survival. Preclinical, antitumor activity has been observed in Ewing sarcoma.

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.

Late Effects of Treatment for Ewing Sarcoma

Patients treated for Ewing sarcoma have a significantly higher risk of developing subsequent neoplasms than do patients in the general population.

Treatment-related acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS) have generally been reported to occur in 1% to 2% of survivors of Ewing sarcoma,; [] although some dose-intensive regimens appear to be associated with a higher risk of hematological malignancy.; [] Treatment-related AML and MDS arise most commonly at 2 to 5 years after diagnosis.

Survivors of Ewing sarcoma remain at increased risk of developing a subsequent solid tumor throughout their lifetime. Sarcomas usually occur within the previous radiation field. The risk of developing a sarcoma after radiation therapy is dose-dependent, with higher doses associated with an increased risk of sarcoma development.; [] The cumulative incidence of subsequent neoplasms in children treated for Ewing sarcoma between 1970 and 1986 at 25 years after diagnosis was 9.0% (confidence interval, 5.8–12.2). Most of these patients received radiation therapy; comparable long-term data do not yet exist for significant numbers of patients who did not receive radiation therapy.

(Refer to the PDQ summary on Late Effects of Treatment for Childhood Cancer for a full discussion of the late effects of cancer treatment in children and adolescents.)

Changes to This Summary (04/04/2018)

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.

Treatment of Recurrent Ewing Sarcoma

Added text about the ADVL1622 and ADVL1615 clinical trials as treatment options under clinical evaluation for patients with recurrent Ewing sarcoma.

This summary is written and maintained by the PDQ Pediatric Treatment Editorial Board, which is editorially independent of NCI. The summary reflects an independent review of the literature and does not represent a policy statement of NCI or NIH. More information about summary policies and the role of the PDQ Editorial Boards in maintaining the PDQ summaries can be found on the About This PDQ Summary and PDQ® - NCI's Comprehensive Cancer Database pages.

About This PDQ Summary

Purpose of This Summary

This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the treatment of childhood Ewing sarcoma. It is intended as a resource to inform and assist clinicians who care for cancer patients. It does not provide formal guidelines or recommendations for making health care decisions.

Reviewers and Updates

This summary is reviewed regularly and updated as necessary by the PDQ Pediatric Treatment Editorial Board, which is editorially independent of the National Cancer Institute (NCI). The summary reflects an independent review of the literature and does not represent a policy statement of NCI or the National Institutes of Health (NIH).

Board members review recently published articles each month to determine whether an article should:

  • be discussed at a meeting,
  • be cited with text, or
  • replace or update an existing article that is already cited.

Changes to the summaries are made through a consensus process in which Board members evaluate the strength of the evidence in the published articles and determine how the article should be included in the summary.

The lead reviewers for Ewing Sarcoma Treatment are:

  • Holcombe Edwin Grier, MD (Dana-Farber Cancer Institute/Boston Children's Hospital)
  • Andrea A. Hayes-Jordan, MD, FACS, FAAP (M.D. Anderson Cancer Center)
  • Karen J. Marcus, MD (Dana-Farber Cancer Institute/Boston Children's Hospital)
  • Paul A. Meyers, MD (Memorial Sloan-Kettering Cancer Center)
  • Thomas A. Olson, MD (Aflac Cancer and Blood Disorders Center of Children's Healthcare of Atlanta - Egleston Campus)
  • Nita Louise Seibel, MD (National Cancer Institute)

Any comments or questions about the summary content should be submitted to through the NCI website's Email Us. Do not contact the individual Board Members with questions or comments about the summaries. Board members will not respond to individual inquiries.

Levels of Evidence

Some of the reference citations in this summary are accompanied by a level-of-evidence designation. These designations are intended to help readers assess the strength of the evidence supporting the use of specific interventions or approaches. The PDQ Pediatric Treatment Editorial Board uses a formal evidence ranking system in developing its level-of-evidence designations.

Permission to Use This Summary

PDQ is a registered trademark. Although the content of PDQ documents can be used freely as text, it cannot be identified as an NCI PDQ cancer information summary unless it is presented in its entirety and is regularly updated. However, an author would be permitted to write a sentence such as “NCI’s PDQ cancer information summary about breast cancer prevention states the risks succinctly: [include excerpt from the summary].”

The preferred citation for this PDQ summary is:

PDQ® Pediatric Treatment Editorial Board. PDQ Ewing Sarcoma Treatment. Bethesda, MD: National Cancer Institute. Updated . Available at: Accessed . [PMID: 26389480]

Images in this summary are used with permission of the author(s), artist, and/or publisher for use within the PDQ summaries only. Permission to use images outside the context of PDQ information must be obtained from the owner(s) and cannot be granted by the National Cancer Institute. Information about using the illustrations in this summary, along with many other cancer-related images, is available in Visuals Online, a collection of over 2,000 scientific images.


Based on the strength of the available evidence, treatment options may be described as either “standard” or “under clinical evaluation.” These classifications should not be used as a basis for insurance reimbursement determinations. More information on insurance coverage is available on on the Managing Cancer Care page.

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