High dose rate interstitial brachytherapy in soft tissue sarcoma: technical aspects and results

Area of Science:

• Oncology
• Radiation Oncology
• Surgical Oncology

Background:

• Radiation therapy is crucial for preserving function in soft tissue sarcoma (STS) management.
• High dose rate (HDR) brachytherapy offers precise radiation dose localization to the tumor bed.
• This study reviews clinical outcomes of immediate postoperative HDR brachytherapy and external beam radiation treatment (EBRT) for STS.

Purpose of the Study:

• To evaluate the efficacy and safety of immediate postoperative HDR brachytherapy combined with EBRT for soft tissue sarcoma (STS).
• To assess local control rates, wound healing, and long-term toxicities in STS patients treated with this combined radiation approach.

Main Methods:

• A review of 17 STS patients (11 primary, 6 recurrent) treated between 1995 and 1999.
• Inclusion criteria: high-grade, large low-grade (>10 cm), recurrent, critically located, or positive margin tumors.
• Treatment involved postoperative HDR brachytherapy (12-18 Gy over 3 days) followed by EBRT (36-60 Gy).

Main Results:

• No local failures were observed within the radiation field in any patient.
• One patient required wound revision for delayed healing; most experienced mild skin reactions (grade 1-2 erythema) during EBRT.
• No long-term neuropathy or significant fibrosis was reported during a median follow-up of 31 months.

Conclusions:

• Immediate postoperative HDR brachytherapy (12-18 Gy) combined with EBRT is an effective treatment for STS.
• This combined radiation strategy demonstrates excellent local control with manageable acute and long-term toxicities.
• The findings support the use of this multimodal approach for selected STS cases.