Interval between surgery and radiotherapy: effect on local control of soft tissue sarcoma

Area of Science:

• Oncology
• Radiation Oncology
• Surgical Oncology

Background:

• Soft tissue sarcomas are rare malignancies requiring multimodal treatment.
• Postoperative radiotherapy (RT) is a key component in managing soft tissue sarcomas to improve local control (LC).
• The optimal timing for initiating postoperative RT after surgery remains a subject of clinical investigation.

Purpose of the Study:

• To determine the clinical significance of the interval between surgery and postoperative RT.
• To evaluate the impact of RT timing on local control rates in soft tissue sarcoma patients.

Main Methods:

• Retrospective review of 799 patients with soft tissue sarcoma who received postoperative RT.
• Analysis of the interval between surgery and RT initiation.
• Univariate and multivariate analyses to assess factors influencing local control.

Main Results:

• The 10- and 15-year actuarial local control (LC) rates were 79% and 78%, respectively.
• Factors significantly associated with inferior LC included positive resection margins, recurrent disease treatment, specific tumor locations (head/neck, deep trunk), older age, certain histopathologic subtypes, larger tumor size, lower RT dose, and high histologic grade.
• A delay of >30 days between surgery and RT showed a trend towards decreased LC, but this was not statistically significant (p=0.07).

Conclusions:

• The interval between surgery and postoperative RT did not significantly impact the 10-year LC rate in soft tissue sarcoma patients.
• RT delay should not be considered an independent adverse prognostic factor for LC.
• Treatment intensification may not be necessary solely due to a delay in RT initiation.