Extrameningeal solitary fibrous tumors-surgery alone or surgery plus perioperative radiotherapy: A retrospective study from the global solitary fibrous tumor initiative in collaboration with the Sarcoma Patients EuroNet.

Rick L. Haas, Iris Walraven, Estelle Lecointe-Artzner, Winan J. van Houdt, Dirk Strauss, Yvonne Schrage, Andrew J. Hayes, Chandrajit P. Raut, Mark Fairweather, Elizabeth H. Baldini, Alessandro Gronchi, Laura De Rosa, Anthony M. Griffin, Peter C. Ferguson, Jay Wunder, Michiel A. J. van de Sande, Augustinus D. G. Krol, Jacus Skoczylas, Claudia Sangalli, Silvia Stacchiotti

Research output: Contribution to journalArticlepeer-review

Abstract

BACKGROUND: Solitary fibrous tumor (SFT) is a rare mesenchymal malignancy. Although surgery is potentially curative, the local relapse risk is high after marginal resections. Given the lack of prospective clinical trial data, the objective of the current study was to better define the role of perioperative radiotherapy (RT) in various SFT presentations by location. METHODS: This was retrospective study performed across 7 sarcoma centers. Clinical information was retrieved from all adult patients with extrameningeal, primary, localized SFT who were treated between 1990 and 2018 with surgery alone (S) compared with those who also received perioperative RT (S+RT). Differences in treatment characteristics between subgroups were tested using analysis of variance statistics and propensity score matching. Local control and overall survival rates were calculated from the start of treatment until progression or death from any cause. RESULTS: Of all 549 patients, 428 (78%) underwent S, and 121 (22%) underwent S+RT. The median follow-up was 52 months. After correction for mitotic count and surgical margins, S+RT was significantly associated with a lower risk of local progression (hazard ratio, 0.19: P = .029), an observation further confirmed by propensity score matching (P = .012); however, this association did not translate into an overall survival benefit. CONCLUSIONS: The results from this retrospective study investigating perioperative RT in patients with primary extrameningeal SFT suggest that combining RT with surgery in the management of this patient population is significantly associated with a reduced risk of local failures, especially in patients who have less favorable resection margins and in those who have tumors with a high mitotic count.
Original languageEnglish
Pages (from-to)3002-3012
Number of pages11
JournalCancer
Volume126
Issue number13
DOIs
Publication statusPublished - 2020

Keywords

  • radiotherapy
  • surgery
  • hemangiopericytoma
  • patient advocacy group
  • solitary fibrous tumor

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