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The Role of Postoperative Radiotherapy in Intracranial Solitary Fibrous Tumor/Hemangiopericytoma: A Multi-institutional Retrospective Study (KROG 18-11)

 Joo Ho Lee  ;  Seung Hyuck Jeon  ;  Chul-Kee Park  ;  Sung-Hye Park  ;  Hong In Yoon  ;  Jong Hee Chang  ;  Chang-Ok Suh  ;  Su Jeong Kang  ;  Do Hoon Lim  ;  In Ah Kim  ;  Jin Hee Kim  ;  Jung Ho Im  ;  Sung-Hwan Kim  ;  Chan Woo Wee  ;  Il Han Kim 
 CANCER RESEARCH AND TREATMENT, Vol.54(1) : 65-74, 2022-01 
Journal Title
Issue Date
Hemangiopericytoma ; Intracranial ; Margin ; Postoperative ; Radiotherapy ; Solitary fibrous tumor
Purpose: This study aimed to evaluate the role of postoperative radiotherapy (PORT) in intracranial solitary fibrous tumor/hemangiopericytoma (SFT/HPC).

Materials and methods: A total of 133 patients with histologically confirmed HPC were included from eight institutions. Gross total resection (GTR) and subtotal resection (STR) were performed in 86 and 47 patients, respectively. PORT was performed in 85 patients (64%). The prognostic effects of sex, age, performance, World Health Organization (WHO) grade, location, size, Ki-67, surgical extent, and PORT on local control (LC), distant metastasis-free survival (DMFS), progression-free survival (PFS), and overall survival (OS) were estimated by univariate and multivariate analyses.

Results: The 10-year PFS, and OS rates were 45%, and 71%, respectively. The multivariate analysis suggested that PORT significantly improved LC (p < 0.001) and PFS (p < 0.001). The PFS benefit of PORT was maintained in the subgroup of GTR (p=0.001), WHO grade II (p=0.001), or STR (p < 0.001). In the favorable subgroup of GTR and WHO grade II, PORT was also significantly related to better PFS (p=0.028). WHO grade III was significantly associated with poor DMFS (p=0.029). In the PORT subgroup, the 0-0.5 cm margin of the target volume showed an inferior LC to a large margin with 1.0-2.0 cm (p=0.021). Time-dependent Cox proportion analysis showed that distant failures were significantly associated with poor OS (p=0.003).

Conclusion: This multicenter study supports the role of PORT in disease control of intracranial SFT/HPC, irrespective of the surgical extent and grade. For LC, PORT should enclose the tumor bed with sufficient margin.
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1. College of Medicine (의과대학) > Dept. of Neurosurgery (신경외과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Radiation Oncology (방사선종양학교실) > 1. Journal Papers
Yonsei Authors
Suh, Chang Ok(서창옥)
Yoon, Hong In(윤홍인) ORCID logo https://orcid.org/0000-0002-2106-6856
Chang, Jong Hee(장종희) ORCID logo https://orcid.org/0000-0003-1509-9800
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