Intraoperative electron-beam therapy for primary and recurrent retroperitoneal soft-tissue sarcoma

Area of Science:

• Oncology
• Radiation Oncology
• Surgical Oncology

Background:

• Retroperitoneal soft-tissue sarcomas are rare and challenging malignancies.
• Maximal surgical resection is a cornerstone of treatment.
• Adjuvant radiotherapy is often employed to improve local control.

Purpose of the Study:

• To evaluate the long-term outcomes of patients with retroperitoneal soft-tissue sarcomas.
• To assess the efficacy of maximal resection combined with intraoperative electron-beam therapy (IOERT) and postoperative external-beam radiotherapy (EBRT).
• To determine the impact of this multimodal approach on survival, local control, and metastatic disease.

Main Methods:

• A cohort of 67 patients with primary or recurrent retroperitoneal soft-tissue sarcoma treated between 1991 and 2004 were analyzed.
• All patients underwent maximal resection and IOERT (mean dose, 15 Gy).
• Forty-five patients received additional postoperative EBRT; 20 patients had prior irradiation.

Main Results:

• The 5-year actuarial overall survival was 64%, with 40% local control and 50% freedom from metastatic disease.
• Local control within the IOERT field was 72% at 5 years.
• Patients achieving R0 resection and completing both IOERT and EBRT had 80% 5- and 10-year overall survival and 100% 5- and 10-year local control, with acceptable morbidity (21% Grade II+ late complications).

Conclusions:

• Intraoperative electron-beam therapy (IOERT) in conjunction with maximal resection and radiotherapy provides excellent local control for retroperitoneal soft-tissue sarcomas.
• This combined modality treatment leads to favorable long-term survival in selected patients.
• The morbidity associated with this approach is acceptable.