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Sequencing radiotherapy for soft tissue sarcoma when re-resection is planned.

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For localized soft-tissue sarcoma (STS) requiring re-resection, radiation therapy (XRT) before or after surgery yields similar outcomes. Treatment sequence decisions for STS patients can be made irrespective of XRT timing effectiveness.

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Area of Science:

  • Oncology
  • Surgical Oncology
  • Radiation Oncology

Background:

  • Soft-tissue sarcoma (STS) often requires re-excision after initial inadequate surgery.
  • The optimal timing of radiation therapy (XRT) in relation to re-resection for STS is debated.
  • Evaluating XRT timing is crucial for improving oncological outcomes in STS management.

Purpose of the Study:

  • To determine if the timing of radiation therapy (XRT) influences disease outcomes in localized soft-tissue sarcoma (STS) patients.
  • To compare outcomes for STS patients receiving XRT before versus after tumor bed re-resection.
  • To assess the impact of XRT sequence on local control, metastasis, and survival in STS.

Main Methods:

  • Retrospective evaluation of 295 localized STS patients who underwent re-resection.
  • Comparison of outcomes based on XRT administration: pre-resection (121 patients) versus post-resection (174 patients).
  • Statistical analysis using univariate and multivariate techniques to assess local control, freedom from metastasis, and survival rates.

Main Results:

  • Residual STS was found in 54% of patients at re-resection; preoperative XRT showed a lower incidence of residual disease (36% vs. 54%).
  • Overall local control rates at 5, 10, and 15 years were high (86%, 84%, 81%) and did not differ significantly between XRT sequences.
  • Multivariate analysis revealed no significant influence of XRT sequence on local control, metastatic control, or survival; a trend towards fewer complications with preoperative XRT was noted but not significant.

Conclusions:

  • Preoperative XRT (approx. 50 Gy) or postoperative XRT (approx. 60 Gy) provides comparable and satisfactory local control and overall disease outcomes for STS patients after inadequate initial excision.
  • Treatment sequencing decisions for STS can be made independently of comparative effectiveness between pre- and post-resection XRT.
  • The study supports flexible treatment planning for STS patients requiring re-resection and adjuvant radiation therapy.