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Radiation Treatment for Ewing Sarcoma Family of Tumors in Adult Patients

A Single Institution’s Experience Over 40 Years

Kharod, Shivam M., MD*; Spiguel, Andre R., MD; Lagmay, Joanne P., MD; Jones, Charles*; Morris, Christopher G., MS*; Gibbs, Charles Parker, MD; Zlotecki, Robert A., MD, PhD*

American Journal of Clinical Oncology: May 2019 - Volume 42 - Issue 5 - p 421–425
doi: 10.1097/COC.0000000000000532
Original Articles: Soft Tissue
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Purpose/Objectives: To report prognostic factors and long-term outcomes in adults with Ewing sarcoma treated with definitive radiotherapy.

Materials and Methods: We reviewed patients 18 years old and above with nonmetastatic Ewing sarcoma treated with radiotherapy +/− chemotherapy or surgery. Outcomes were stratified by age (30 and above vs. younger than 30 y), soft tissue extension, tumor size (≥8.5 vs. <8.5 cm), tumor location, resection (yes vs. no), and treatment era (1970–1992 vs. 1993–2012). Toxicities were scored using the RTOG criteria.

Results: Fifty-five patients (21 women) were treated with radiotherapy. Average age at diagnosis: 26.7 years (38 patients below 30 vs. 17 patients 30 y and above). A total of 43 had soft tissue extension (78%). Median tumor size: 8.5 cm. Most tumors were in the pelvis (40%), followed by the lower (27%) and upper (24%) extremities. All but 1 patient received chemotherapy; 13 underwent resection. Median dose: 55 Gy. Median follow-up: 3.6 years; 17.5 years for living patients. The 5-year overall (OS) and cause-specific survival (CSS) rates were both 46%. OS and CSS rates were unaffected by age (P=0.97), tumor size (P=0.12), or tumor location (P=0.99). Soft tissue extension portended a significantly poorer prognosis for 5-year OS and CSS: 37% vs. 82% (with and without, respectively; P=0.04). Patients who underwent resection had improved 5-year OS and CSS: 77% vs. 37%, respectively (P=0.01). Patients treated after 1993 had improved 5-year OS: 58% vs. 37% (P=0.0264).

Conclusions: Adult patients with Ewing sarcoma experience similar treatment outcomes regardless of age at diagnosis. Soft tissue extension represents a poor prognostic factor. Aggressive trimodality therapy achieved the highest OS and CSS.

Departments of *Radiation Oncology

Orthopaedics and Rehabilitation

Pediatrics, Division of Hematology and Oncology, University of Florida College of Medicine, Gainesville, FL

The authors declare no conflicts of interest.

Reprints: Robert A. Zlotecki, MD, PhD, 2000 SW Archer Road, Gainesville, FL 32610. E-mail: zlotera@ufl.edu.

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