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Therapy for localized Ewing's sarcoma of bone
F A Hayes1, E I Thompson, W H Meyer
1Department of Hematology-Oncology, St Jude Children's Research Hospital, Memphis, TN 38101.
Summary
Localized Ewing's sarcoma of bone treated with chemotherapy and surgery/radiation therapy showed an 80% 5-year survival rate. Larger tumors (>8 cm) were associated with a higher risk of local recurrence and worse disease-free survival.
Area of Science:
- Pediatric Oncology
- Orthopedic Oncology
- Radiation Oncology
Background:
- Ewing's sarcoma of bone is a rare but aggressive bone cancer primarily affecting children and young adults.
- Effective treatment strategies are crucial for improving outcomes in localized disease.
Purpose of the Study:
- To evaluate the efficacy of nonintensive chemotherapy combined with surgery or radiation therapy (RT) for localized Ewing's sarcoma of bone.
- To identify prognostic factors influencing disease-free survival and local control.
Main Methods:
- Fifty-two previously untreated patients received induction chemotherapy followed by surgery or RT.
- Radiation therapy doses varied (30-35 Gy vs. 50-55 Gy) based on initial response.
- Prognostic factors including WBC count, tumor size, and primary site were analyzed.
Main Results:
- An 80% 5-year survival rate was observed for all patients.
- Patients with primary tumors >8 cm had a higher rate of local recurrence (12/28) compared to those with smaller lesions (2/22).
- High WBC count and larger tumor size (>8 cm) were associated with worse disease-free survival.
Conclusions:
- Nonintensive chemotherapy combined with surgery/RT is an effective treatment for localized Ewing's sarcoma of bone.
- Tumor size is a significant prognostic factor, with larger lesions predicting poorer outcomes.
- Further research into optimizing RT and chemotherapy regimens for high-risk patients is warranted.