Abstract
Purpose
Postoperative stereotactic radiosurgery (SRS) has been shown to establish local control in patients with resected brain metastases, yet its efficacy may be limited, particularly for resected lesions with large post-operative resection cavities. We describe the efficacy of postoperative fractionated stereotactic radiotherapy (FSRT) for local control in patients who have undergone resection for brain metastases.
Methods
In this retrospective cohort study, we analyzed patients who received FSRT for resected brain metastases in 3 or 5 fractions. Time to local recurrence was the primary endpoint in this study.
Results
Sixty-seven patients (n = 29 female, n = 38 male) met study criteria for review. The median age of the cohort was 62 years (range 18–79 years). Median preoperative tumor volume was 11.1 cm3 (range 0.4–77.0 cm3). The rate of local control was 91.0% at 6 months, 85.1% at 12 months, and 85.1% at 18 months. Estimates of freedom from local recurrence at 6 and 12 months were 90.9% and 84.3%, respectively. Higher biologically equivalent doses (BED10) were found to be predictive of longer freedom from local recurrence on univariate and multivariable analysis. Larger cavity volumes were found to correspond to longer time to local recurrence on univariate and multivariable analysis.
Conclusion
Our results suggest that postoperative FSRT may be an effective method for providing local control to the surgical bed in patients with resected brain metastases, particularly for larger tumors not amenable to conventional, single-fraction SRS. Additional prospective studies are needed to confirm these findings.
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Abbreviations
- WBRT:
-
Whole-brain radiotherapy
- SRS:
-
Stereotactic radiosurgery
- FSRT:
-
Fractionated stereotactic radiotherapy
- MRI:
-
Magnetic resonance imaging
- CT:
-
Computed tomography
- KPS:
-
Karnofsky performance score
- GPA:
-
Graded prognostic assessment
- IRB:
-
Institutional review board
- OS:
-
Overall survival
- T1C+:
-
T1-weighted post-contrast
- BED10 :
-
Biologically effective dose
- EQD2:
-
equivalent dose in 2 Gy
- NSCLC:
-
Non-small cell lung cancer
- CI:
-
Confidence interval
- HR:
-
Hazard ratio
- IORT:
-
Intraoperative radiotherapy
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Traylor, J.I., Habib, A., Patel, R. et al. Fractionated stereotactic radiotherapy for local control of resected brain metastases. J Neurooncol 144, 343–350 (2019). https://doi.org/10.1007/s11060-019-03233-9
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DOI: https://doi.org/10.1007/s11060-019-03233-9