Stereotactic Radiosurgery to More Than 10 Brain Metastases: Evidence to Support the Role of Radiosurgery for Ideal Hippocampal Sparing in the Treatment of Multiple Brain Metastases
Document Type
Article
Abstract
Background: Brain metastases are a common occurrence, with literature supporting the treatment of a limited number of brain metastases with stereotactic radiosurgery (SRS), as opposed to whole brain radiotherapy (WBRT). Less well understood is the role of SRS in patients with ≥10 brain metastases. Methods: Patients treated with SRS to ≥10 brain metastases without concurrent WBRT between March 1999 and December 2016 were reviewed. Analysis was performed for overall survival, treated lesion freedom from progression (FFP), freedom from new metastases (FFNMs), and adverse radiation effect. Hippocampal volumes were retrospectively generated in patients treated with up-front SRS for evaluation of dose volume metrics. Results: A total of 143 patients were identified with 75 patients having up-front SRS and 68 patients being treated as salvage therapy after prior WBRT. The median number of lesions per patient was 13 (interquartile range [IQR], 11–17). Median total volume of treatment was 4.1 cm3 (IQR, 2.0–9.9 cm3). The median 12-month FFP for up-front and salvage treatment was 96.8% (95% confidence interval [CI], 95.5–98.1) and 83.6% (95% CI, 79.9–87.5), respectively (P < 0.001). Twelve-month FFNMs for up-front and salvage SRS was 18.8% (95% CI, 10.9–32.3) versus 19.2% (95% CI, 9.7–37.8), respectively (P = 0.90). The mean hippocampal dose was 150 cGy (IQR, 100–202 cGy). Conclusions: Excellent rates of local control can be achieved when treating patients with >10 intracranial metastases either in the up-front or salvage setting. Hippocampal sparing is readily achievable with expected high rates of new metastatic lesions in treated patients.
Publication Date
3-1-2020
Publication Title
World Neurosurgery
ISSN
18788750
E-ISSN
18788769
Volume
135
First Page
e174
Last Page
e180
PubMed ID
31785436
Digital Object Identifier (DOI)
10.1016/j.wneu.2019.11.089
Recommended Citation
Susko, Matthew S.; Garcia, Michael A.; Ma, Lijun; Nakamura, Jean L.; Raleigh, David R.; Fogh, Shannon; Theodosopoulos, Philip; McDermott, Michael; Sneed, Penny K.; and Braunstein, Steve E., "Stereotactic Radiosurgery to More Than 10 Brain Metastases: Evidence to Support the Role of Radiosurgery for Ideal Hippocampal Sparing in the Treatment of Multiple Brain Metastases" (2020). Radiation Oncology. 30.
https://scholar.barrowneuro.org/radiation-oncology/30