Who Is Most Commonly Affected?

Ewing sarcoma predominantly affects children, adolescents and young adults, with peak incidence between 10 and 20 years of age. It is rare under the age of five or over the age of 30. Unlike osteosarcoma, Ewing sarcoma can occur in the flat bones of the pelvis, ribs, scapula and spine in addition to the long bones of the limbs. Pelvic Ewing sarcoma is often diagnosed later due to the lack of early symptoms and its deep anatomical location.

Types of Ewing Sarcoma

Ewing sarcoma belongs to a family of tumours collectively called the Ewing Sarcoma Family of Tumours (ESFT), all characterised by EWSR1 gene rearrangements.

Classic Ewing Sarcoma of Bone: The most common presentation. Arises within the medullary cavity of bone and involves the surrounding soft tissue as it grows. Ewing sarcoma most commonly affects the pelvis, femur, tibia, and ribs.

Extraosseous (Soft Tissue) Ewing Sarcoma: Arises in soft tissues rather than bone, accounting for approximately 15–20% of ESFT. Extraosseous Ewing sarcoma is treated with the same multimodal approach as bone Ewing sarcoma.

Primitive Neuroectodermal Tumour (PNET): Historically classified as a separate entity, PNETs of bone and soft tissue are now recognised as part of the Ewing sarcoma family based on shared EWSR1-ETS gene fusions. They exhibit greater neural differentiation than classic Ewing sarcoma.

Askin Tumour: A PNET arising in the chest wall (thoracopulmonary region) is part of the Ewing sarcoma family with the same chromosomal translocation. Treated with ESFT protocols.

The specific chromosomal translocation, most commonly t(11;22)(q24;q12), producing the EWSR1-FLI1 fusion gene, is identified on molecular testing and confirms the diagnosis. Less common fusions include EWSR1-ERG, EWSR1-ETV1, and others. The presence of the specific fusion type may carry prognostic significance in some studies.

All ESFT subtypes are treated with the same multimodal approach: induction chemotherapy, local treatment (surgery and radiation), and adjuvant chemotherapy.

​Symptoms of Ewing Sarcoma

Patients may experience localised bone pain that is progressive and may worsen at night; swelling, warmth or redness over the affected area; a palpable mass over the bone or soft tissue; fever present in a significant proportion of Ewing sarcoma patients due to the tumour's inflammatory biology; fatigue and weight loss in more advanced cases; and neurological symptoms such as leg weakness or bladder dysfunction if the tumour involves the spine or pelvis. Fever combined with bone pain in a young person is sometimes initially attributed to infection or osteomyelitis, so specialist imaging and biopsy are essential to confirm the correct diagnosis.

Diagnosis

Imaging begins with plain X-ray, which may show a "moth-eaten" pattern of bone destruction with an associated soft-tissue mass. MRI provides detailed local staging. CT scan of the chest, bone scan or PET-CT, and bone marrow biopsy are used to assess for distant spread. Biopsy with histopathology and molecular confirmation of the EWS translocation is required for definitive diagnosis. As with osteosarcoma, biopsy planning is critical and should ideally be performed by a bone sarcoma specialist.

Is Ewing Sarcoma Treatable with Surgery and Chemotherapy?

Yes. Modern sarcoma treatment in India for Ewing sarcoma follows a multidisciplinary protocol combining systemic chemotherapy, local treatment, and further systemic therapy.

Chemotherapy: The standard induction regimen includes vincristine-ifosfamide-doxorubicin-etoposide (VIDE) or vincristine-doxorubicin-cyclophosphamide alternating with ifosfamide-etoposide (VDC/IE protocol), delivered before and after local treatment. Chemotherapy both shrinks the primary tumour and addresses micrometastatic disease.

Surgery: Where technically feasible with adequate margins, surgical resection is the preferred local treatment. Limb-sparing approaches are used when possible. For pelvic or spinal tumours where surgery would cause significant morbidity, radiation may be preferred.

Radiation Therapy: High-dose radiation can achieve excellent local control for unresectable Ewing sarcoma. It may be used as the sole local treatment or in combination with surgery when margins are involved.

Fertility and Long-Term Outlook After Treatment

Fertility counselling and sperm or egg banking before treatment should be discussed with young patients of reproductive age before starting chemotherapy. Long-term follow-up is essential to monitor for recurrence and late treatment effects including cardiotoxicity from doxorubicin and secondary malignancies related to radiotherapy and alkylating agents. Patients with localised Ewing sarcoma who complete full multimodal treatment have substantially better long-term outcomes than those presenting with metastatic disease. The Ewing sarcoma treatment cost in India varies by protocol length, surgical complexity, and hospital