Overview

The Ewing's family of tumors (EFT) is a group of rare cancers that primarily affect the bones or the soft tissue around bones. These tumors most commonly occur in children and young adults, though they can develop at any age. EFT includes:

• Ewing sarcoma of bone: The most common type, usually found in the long bones of the arms and legs, pelvis, or chest.
• Extraosseous Ewing sarcoma: Tumors that develop in soft tissues outside the bone, such as muscle or cartilage.
• Peripheral primitive neuroectodermal tumor (pPNET): A tumor that arises in soft tissue and may affect the nerves.
• Askin tumor: A type of pPNET that develops in the chest wall.

EFTs are aggressive cancers, meaning they can grow quickly and spread to other parts of the body (metastasize). However, with advances in treatment, the outlook for many patients has improved significantly.

Who It Affects

Ewing's family of tumors primarily affects:

• Children and young adults between the ages of 10 and 20, though they can occur in younger children and adults.
• Males slightly more often than females.
• Caucasians more frequently than other racial or ethnic groups, though the reason for this is unknown.

Prevalence

Ewing sarcoma is rare, accounting for about 1% of all childhood cancers (source: National Cancer Institute). In the United States, approximately 200 to 250 children and young adults are diagnosed with Ewing sarcoma each year. The incidence is slightly higher in Europe, with about 1 in 1 million children affected annually (source: World Health Organization).

Symptoms

The symptoms of Ewing's family of tumors depend on the location and size of the tumor. Common symptoms include:

Bone Tumors

• Pain: The most common symptom, often worsening at night or with physical activity. The pain may initially be intermittent but becomes constant as the tumor grows.
• Swelling or a lump: A visible or palpable mass may develop at the site of the tumor. The skin over the area may feel warm or appear red.
• Fever: Some patients experience unexplained fevers, which may be mistaken for an infection.
• Fractures: Weaken bones may break easily, even with minor trauma.
• Limited mobility: If the tumor is near a joint, it may restrict movement.

Soft Tissue Tumors

• Swelling or a lump: A painless or painful mass in the soft tissue, such as the chest wall (Askin tumor), arms, legs, or trunk.
• Numbness or tingling: If the tumor presses on a nerve, it may cause sensory changes.
• Weakness: Tumors pressing on nerves or muscles may lead to weakness in the affected area.

Systemic Symptoms

If the cancer has spread (metastasized) to other parts of the body, additional symptoms may include:

• Weight loss: Unexplained weight loss may occur as the cancer progresses.
• Fatigue: Persistent tiredness that doesn’t improve with rest.
• Shortness of breath: If the cancer spreads to the lungs, it may cause difficulty breathing.
• Anemia: Low red blood cell count, leading to pale skin and fatigue.

It’s important to note that these symptoms can also be caused by conditions other than cancer. However, if symptoms persist or worsen, consult a healthcare provider for evaluation.

Causes and Risk Factors

Causes

The exact cause of Ewing's family of tumors is unknown. However, researchers have identified a genetic mutation that plays a key role in their development. In most cases, a chromosomal translocation (a rearrangement of genetic material) occurs between chromosomes 11 and 22. This translocation fuses the EWSR1 gene with another gene, most commonly the FLI1 gene, creating an abnormal protein that drives uncontrolled cell growth.

Unlike some cancers, Ewing's family of tumors are not strongly linked to environmental factors, such as exposure to chemicals or radiation. They also do not appear to be inherited, meaning they are not typically passed down through families.

Risk Factors

While the exact cause is unclear, certain factors may increase the risk of developing Ewing's family of tumors:

• Age: Most cases occur in children and young adults between 10 and 20 years old.
• Gender: Males are slightly more likely to develop EFT than females.
• Race: EFT is more common in Caucasians than in people of African or Asian descent.
• Genetic predisposition: Rarely, individuals with certain genetic syndromes, such as Li-Fraumeni syndrome, may have a higher risk.

It’s important to note that having one or more risk factors does not mean a person will develop Ewing's family of tumors. Many people with these risk factors never develop the disease.

Diagnosis

Diagnosing Ewing's family of tumors typically involves a combination of imaging tests, biopsies, and laboratory studies. Early and accurate diagnosis is crucial for effective treatment.

Medical History and Physical Exam

A healthcare provider will begin by taking a detailed medical history and performing a physical examination. They will ask about symptoms, their duration, and any family history of cancer. During the exam, they may check for swelling, tenderness, or lumps.

Imaging Tests

Imaging tests help visualize the tumor and determine its size, location, and whether it has spread. Common imaging tests include:

• X-rays: Often the first test used to identify bone abnormalities, such as tumors or fractures.
• Magnetic Resonance Imaging (MRI): Provides detailed images of bones and soft tissues, helping to assess the extent of the tumor.
• Computed Tomography (CT) scan: Used to evaluate the tumor and check for metastasis, particularly in the lungs or other organs.
• Positron Emission Tomography (PET) scan: Helps identify areas of active cancer cells, including metastases that may not be visible on other scans.
• Bone scan: Detects areas of abnormal bone activity, which may indicate the presence of tumors.

Biopsy

A biopsy is the only way to confirm a diagnosis of Ewing's family of tumors. During this procedure, a small sample of the tumor is removed and examined under a microscope. Types of biopsies include:

• Needle biopsy: A thin needle is inserted into the tumor to extract a small tissue sample.
• Surgical biopsy: A surgeon removes a portion (incisional biopsy) or the entire tumor (excisional biopsy) for analysis.

The tissue sample is analyzed for the presence of the EWSR1-FLI1 fusion gene or other genetic abnormalities characteristic of EFT.

Laboratory Tests

Blood tests may be performed to assess overall health and check for markers of cancer, such as:

• Complete blood count (CBC): Measures red blood cells, white blood cells, and platelets.
• Lactate dehydrogenase (LDH): Elevated levels may indicate tumor activity.
• Alkaline phosphatase: High levels may suggest bone involvement.

Staging

Once diagnosed, the cancer is staged to determine how far it has spread. Staging helps guide treatment decisions. The most common staging system for Ewing sarcoma is:

• Localized: The tumor is confined to its original site and has not spread.
• Metastatic: The cancer has spread to other parts of the body, such as the lungs, bones, or bone marrow.

About 25% of patients have metastatic disease at the time of diagnosis (source: American Society of Clinical Oncology).

Treatment Options

Treatment for Ewing's family of tumors typically involves a combination of chemotherapy, surgery, and radiation therapy. The specific approach depends on the tumor's location, size, stage, and the patient's overall health.

Chemotherapy

Chemotherapy is usually the first line of treatment for EFT. It uses powerful drugs to kill cancer cells or stop them from growing. Common chemotherapy drugs for EFT include:

• Vincristine
• Doxorubicin (Adriamycin)
• Cyclophosphamide
• Ifosfamide
• Etoposide

Chemotherapy is often given in cycles, with periods of treatment followed by rest to allow the body to recover. It may be used:

• Before surgery or radiation (neoadjuvant therapy) to shrink the tumor.
• After surgery or radiation (adjuvant therapy) to kill any remaining cancer cells.
• As the primary treatment if the tumor cannot be surgically removed.

Surgery

Surgery aims to remove the tumor and a margin of healthy tissue around it. The goal is to eliminate all cancer cells while preserving as much function as possible. Types of surgery include:

• Limb-sparing surgery: The tumor is removed without amputating the limb. This is often followed by reconstructive surgery to restore function.
• Amputation: In cases where the tumor is large or involves critical structures (such as nerves or blood vessels), amputation may be necessary.
• Resection of soft tissue tumors: For tumors in soft tissues, such as the chest wall (Askin tumor), surgery may involve removing the affected tissue and reconstructing the area.

Radiation Therapy

Radiation therapy uses high-energy rays to kill cancer cells. It may be used:

• If the tumor cannot be completely removed with surgery.
• To treat metastases, such as in the lungs or other bones.
• In combination with chemotherapy for tumors that are difficult to resect.

Side effects of radiation may include skin irritation, fatigue, and damage to nearby healthy tissue.

Targeted Therapy and Immunotherapy

Researchers are exploring new treatments for EFT, including:

• Targeted therapy: Drugs that specifically target the genetic mutations driving the tumor, such as the EWSR1-FLI1 fusion gene.
• Immunotherapy: Treatments that help the immune system recognize and attack cancer cells.
• Stem cell transplant: High-dose chemotherapy followed by a stem cell transplant may be an option for patients with recurrent or high-risk EFT.

Clinical Trials

Participation in clinical trials may provide access to cutting-edge treatments. Clinical trials test new drugs, therapies, or combinations of treatments to improve outcomes. Patients should discuss with their healthcare team whether a clinical trial is a suitable option. Resources for finding clinical trials include:

• ClinicalTrials.gov
• National Cancer Institute

Living with Ewing's Family of Tumors

A diagnosis of Ewing's family of tumors can be overwhelming, but there are ways to manage the physical and emotional challenges of the disease. Here are some tips for daily living:

Managing Side Effects

• Pain management: Work with your healthcare team to develop a pain management plan, which may include medications, physical therapy, or alternative therapies like acupuncture.
• Nutrition: Eat a balanced diet rich in fruits, vegetables, lean proteins, and whole grains. A dietitian can help address nutrition-related side effects, such as nausea or loss of appetite.
• Fatigue: Prioritize rest and conserve energy. Gentle exercise, such as walking or yoga, may help combat fatigue.
• Emotional support: Seek support from counselors, support groups, or mental health professionals to cope with the emotional impact of cancer.

Physical Activity

Staying active can improve strength, mobility, and mood. Depending on the treatment plan, activities may include:

• Physical therapy to regain strength and mobility after surgery.
• Low-impact exercises, such as swimming or cycling, to maintain fitness.
• Stretching or yoga to improve flexibility and reduce stress.

Always consult your healthcare provider before starting any new exercise program.

Follow-Up Care

Regular follow-up appointments are essential to monitor for recurrence or late effects of treatment. Follow-up care may include:

• Imaging tests (MRI, CT, or PET scans) to check for signs of recurrence.
• Blood tests to assess overall health and organ function.
• Rehabilitation services, such as physical or occupational therapy, to address long-term side effects.

Support Resources

Many organizations offer support and resources for patients and families affected by Ewing's family of tumors:

• CureSearch for Children’s Cancer
• LIVESTRONG Foundation
• American Cancer Society
• St. Baldrick’s Foundation

Prevention

There is no known way to prevent Ewing's family of tumors, as their exact cause remains unclear. However, the following general health guidelines may help reduce the risk of cancer:

• Avoid exposure to radiation: Limit unnecessary exposure to radiation, such as repeated X-rays or CT scans, unless medically necessary.
• Maintain a healthy lifestyle: Eat a balanced diet, exercise regularly, and avoid smoking or excessive alcohol consumption.
• Regular medical check-ups: Routine check-ups can help detect health issues early, though EFT is rare and not typically screened for.
• Genetic counseling: If there is a family history of cancer or genetic syndromes (such as Li-Fraumeni syndrome), consider genetic counseling to assess risk.

Since EFT is not strongly linked to environmental or lifestyle factors, prevention focuses on early detection and prompt treatment.

Complications

If left untreated, Ewing's family of tumors can lead to serious complications, including:

• Metastasis: The cancer may spread to other bones, the lungs, bone marrow, or other organs, making treatment more challenging.
• Pathological fractures: Tumors weaken bones, increasing the risk of fractures even with minor trauma.
• Spinal cord compression: If the tumor presses on the spinal cord, it can cause pain, weakness, or paralysis.
• Organ failure: Metastases to vital organs, such as the lungs or liver, can impair their function.
• Severe pain: As the tumor grows, it can cause significant pain that affects quality of life.
• Infections: Chemotherapy and radiation can weaken the immune system, increasing the risk of infections.

Early diagnosis and treatment are critical to preventing these complications and improving outcomes.

When to Seek Emergency Care

References and Further Reading

For more information about Ewing's family of tumors, visit these reputable sources:

• Mayo Clinic - Ewing Sarcoma
• National Cancer Institute - Ewing Sarcoma Treatment
• American Cancer Society - Ewing Tumors
• Cleveland Clinic - Ewing Sarcoma
• World Health Organization - Cancer