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Is 5 the New 25? Long-Term Oncologic Outcomes From a Phase II, Prospective, 5-Fraction Preoperative Radiation Therapy Trial in Patients With Localized Soft Tissue Sarcoma. Adv Radiat Oncol 2022;7(3):100850

Date

06/02/2022

Pubmed ID

35647402

Pubmed Central ID

PMC9133395

DOI

10.1016/j.adro.2021.100850

Scopus ID

2-s2.0-85127293946   1 Citation

Abstract

PURPOSE: Management of adult soft tissue sarcomas entails a multidisciplinary approach with surgery and radiation therapy with or without chemotherapy. The use of preoperative irradiation has been well established, and although conventional fractionation involves daily treatments over the course of 5 weeks, higher doses per fraction may be beneficial due to the radiobiologic profile of sarcoma. In this study we report long-term oncologic outcomes from a single-institution, phase II study evaluating a 5-fraction hypofractionated course of preoperative radiation.

METHODS AND MATERIALS: Preoperative hypofractionated radiation therapy was administered to 35 Gy in 5 fractions every other day followed by resection 4 to 6 weeks later. If given, chemotherapy consisted of a doxorubicin-ifosfamide-based regimen delivered neoadjuvantly. The primary endpoint was local control. Additional survival and pathologic outcomes, including overall and distant metastasis-free survival, tumor, and treatment-related pathology, as well as acute and late toxicity were examined.

RESULTS: Thirty-two patients were enrolled in this prospective, single-arm phase II trial. At a median follow-up of 36.4 months (range, 3-56), no patient developed a local recurrence, and the 3-year overall and distant metastasis-free survival was 82.2% and 69%, respectively. Major acute postoperative wound complications occurred in 25% of patients. Grade 2 and 3 fibrosis occurred in 21.7% and 13% of patients, respectively. The 2-year median and mean Musculoskeletal Tumor Society score for all patients was 28 and 27.4, respectively.

CONCLUSIONS: A condensed course of preoperative hypofractionated radiation therapy leads to excellent rates of local control and survival with acceptable toxicity profiles. Potential studies ideally with phase II or III randomized trials would help corroborate these findings and other preoperative hypofractionated results in soft tissue sarcomas.

Author List

Bedi M, Singh R, Charlson JA, Kelly T, Johnstone C, Wooldridge A, Hackbarth DA, Moore N, Neilson JC, King DM

Authors

Manpreet Bedi MD, MS Associate Professor in the Radiation Oncology department at Medical College of Wisconsin
John A. Charlson MD Associate Professor in the Medicine department at Medical College of Wisconsin
Tracy R. Kelly MD Associate Professor in the Radiation Oncology department at Medical College of Wisconsin
David M. King MD Chair, Professor in the Orthopaedic Surgery department at Medical College of Wisconsin
John C. Neilson MD Associate Professor in the Orthopaedic Surgery department at Medical College of Wisconsin