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Resectability, Recurrence, and Risk Stratification of Giant Solitary Fibrous Tumors in the Thoracic Cavity

  • Thoracic Oncology
  • Published:
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Abstract

Background

Solitary fibrous tumors (SFTs) are rare mesenchymal tumors most commonly arising from the pleura in the thoracic cavity. The impact of tumor size on risk of recurrence in thoracic SFTs is not well understood.

Methods

A single institution review was performed on all resected thoracic SFTs (1992–2019) with giant SFT defined as ≥ 15 cm. Clinical information, pathologic characteristics, and long-term survival data were collected, and predictors of recurrence and survival were evaluated with regression and Kaplan–Meier analysis.

Results

There were 38 thoracic SFTs resected from patients, with the majority of tumors (n = 23, 60.5%) originating from visceral pleura. There were nine (23.7%) giant SFTs with a mean size 20.4 cm (range 17–30 cm). Mean follow-up time was 81.0 months (range 1–261 months), during which 4 of 38 (10.5%) patients experienced a recurrence within the thorax (range 51–178 months). The presence of tumor necrosis (p = 0.021) and ≥ 4 mitoses per high-powered field (p = 0.010) were associated with SFT recurrence on univariate regression. Overall 5-year, 10-year, and 20-year survival was 78.2%, 72.6%, and 42.4%, respectively, and SFT-related mortality occurred in three patients at 83, 180, and 208 months postoperatively. There were no recurrences or SFT-related mortality among patients with giant SFT.

Conclusion

This study represents one of the largest contemporary single institution reviews of long-term outcomes of giant thoracic SFT. Our data suggest that size is not a risk factor for recurrence in thoracic SFTs and long-term survival is excellent for giant SFTs.

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Funding

This research was funded by the University of California San Francisco Thoracic Oncology Program; no external funding or support was used.

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Correspondence to Gavitt A. Woodard MD.

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Woodard, G.A., Fels Elliott, D.R., Yap, A. et al. Resectability, Recurrence, and Risk Stratification of Giant Solitary Fibrous Tumors in the Thoracic Cavity. Ann Surg Oncol 28, 4953–4959 (2021). https://doi.org/10.1245/s10434-021-09757-7

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