INTRODUCTION: We sought to quantify and identify risk factors associated with margin recurrence (MR) requiring salvage radiotherapy after stereotactic body radiation therapy (SBRT) for spinal metastases. METHODS: We retrospectively reviewed patients with spinal metastases who were treated with single-fraction SBRT between 2006 and 2009. Gross tumor was contoured, along with either the entire associated vertebral body(ies) or the posterior elements, and included in the planning target volume. No additional margins were used. MR was defined as recurrent tumor within one vertebral level above or below the treated lesion that required salvage radiotherapy. Only patients who presented for 3-month post-SBRT follow-up were included in the analysis. Fine and Gray competing risk regression models were generated to identify variables associated with higher risks of MR. MR was plotted using cumulative incidence analysis. RESULTS: SBRT was delivered to 208 lesions in 149 patients. Median follow-up was 8.6 months, and median survival was 12.8 months. The median prescribed dose was 14 Gy (10-16 Gy). MR occurred in 26 (12.5%) treated lesions, at a median time of 7.7 months after SBRT. Patients with paraspinal disease at the time of SBRT (20.8% vs. 7.6% of patients; p = 0.02), and those treated with <16 Gy (16.3% vs. 6.3% of patients, p = 0.14) had higher rates of MR. Both variables were associated with significantly higher risk of MR on multivariate analysis. CONCLUSION: SBRT for spinal metastases results in a low overall rate of MR. The presence of paraspinal disease at the time of SBRT and a dose of <16 Gy were associated with higher risks of MR.
INTRODUCTION: We sought to quantify and identify risk factors associated with margin recurrence (MR) requiring salvage radiotherapy after stereotactic body radiation therapy (SBRT) for spinal metastases. METHODS: We retrospectively reviewed patients with spinal metastases who were treated with single-fraction SBRT between 2006 and 2009. Gross tumor was contoured, along with either the entire associated vertebral body(ies) or the posterior elements, and included in the planning target volume. No additional margins were used. MR was defined as recurrent tumor within one vertebral level above or below the treated lesion that required salvage radiotherapy. Only patients who presented for 3-month post-SBRT follow-up were included in the analysis. Fine and Gray competing risk regression models were generated to identify variables associated with higher risks of MR. MR was plotted using cumulative incidence analysis. RESULTS: SBRT was delivered to 208 lesions in 149 patients. Median follow-up was 8.6 months, and median survival was 12.8 months. The median prescribed dose was 14 Gy (10-16 Gy). MR occurred in 26 (12.5%) treated lesions, at a median time of 7.7 months after SBRT. Patients with paraspinal disease at the time of SBRT (20.8% vs. 7.6% of patients; p = 0.02), and those treated with <16 Gy (16.3% vs. 6.3% of patients, p = 0.14) had higher rates of MR. Both variables were associated with significantly higher risk of MR on multivariate analysis. CONCLUSION: SBRT for spinal metastases results in a low overall rate of MR. The presence of paraspinal disease at the time of SBRT and a dose of <16 Gy were associated with higher risks of MR.
Authors: Roman O Kowalchuk; Michael R Waters; K Martin Richardson; Kelly Spencer; James M Larner; Jason P Sheehan; William H McAllister; Charles R Kersh Journal: J Radiosurg SBRT Date: 2020
Authors: Rachel F Shenker; Jeremy G Price; Corbin D Jacobs; Manisha Palta; Brian G Czito; Yvonne M Mowery; John P Kirkpatrick; Matthew J Boyer; Taofik Oyekunle; Donna Niedzwiecki; Haijun Song; Joseph K Salama Journal: Cancers (Basel) Date: 2022-05-13 Impact factor: 6.575
Authors: Varun Puvanesarajah; Sheng-Fu Larry Lo; Nafi Aygun; Jason A Liauw; Ignacio Jusué-Torres; Ioan A Lina; Uri Hadelsberg; Benjamin D Elder; Ali Bydon; Chetan Bettegowda; Daniel M Sciubba; Jean-Paul Wolinsky; Daniele Rigamonti; Lawrence R Kleinberg; Ziya L Gokaslan; Timothy F Witham; Kristin J Redmond; Michael Lim Journal: J Neurosurg Spine Date: 2015-07-31
Authors: Chia-Lin Tseng; Wietse Eppinga; Raphaele Charest-Morin; Hany Soliman; Sten Myrehaug; Pejman Jabehdar Maralani; Mikki Campbell; Young K Lee; Charles Fisher; Michael G Fehlings; Eric L Chang; Simon S Lo; Arjun Sahgal Journal: Global Spine J Date: 2017-04-06