Progress in Retroperitoneal Sarcoma Management: Surgical and Radiotherapy Approaches

Area of Science:

• Oncology
• Surgical Oncology
• Radiation Oncology

Background:

• Surgical resection is the primary curative treatment for retroperitoneal sarcomas (RPS).
• High local recurrence rates persist after surgery alone due to RPS complexity and proximity to vital structures.
• Radiotherapy (RT) is explored to improve local control and prevent RPS recurrence.

Purpose of the Study:

• To evaluate the role of preoperative RT in conjunction with surgical resection for RPS.
• To assess the impact of neoadjuvant RT on abdominal recurrence-free survival in RPS patients.

Main Methods:

• A global randomized trial (STRASS1) comparing surgery with and without preoperative RT.
• Analysis based on pre-specified abdominal recurrence-free survival and sensitivity analysis using standard local recurrence definitions.
• Outcomes assessed by compliance to the RT protocol.

Main Results:

• The STRASS1 trial did not show a significant overall benefit for neoadjuvant RT.
• Sensitivity analysis indicated a potential histology-specific benefit for well- and some de-differentiated liposarcomas.
• Compliance with the RT protocol influenced outcomes, suggesting feasibility and potential efficacy in select cases.

Conclusions:

• Neoadjuvant RT does not offer a universal benefit for all retroperitoneal sarcomas.
• Histology-specific benefits of RT, particularly for liposarcomas, warrant further investigation.
• Multidisciplinary collaboration and personalized treatment strategies are crucial for optimizing RPS management.