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- W4288045492 abstract "Stereotactic radiosurgery (SRS) after maximal safe resection is an accepted treatment strategy for patients with cerebral metastatic disease. Despite its high conformality profile, the incidence of radionecrosis (RN) remains high. SRS delivered pre-operatively could be associated with a reduced incidence of RN. We sought to evaluate whether neoadjuvant SRS could reduce radiotherapy doses in a cohort of patients treated with post-operative SRS.A cohort of 47 brain metastases (BM) treated at 2 academic institutions was retrospectively analyzed. Subjects underwent surgical extirpation of BMs and subsequent SRS to surgical bed. Post-operative volumetric and dosimetric data was collected from records or recreations of delivered plans; pre-operative data were derived from hypothetical radiotherapy courses and compared using Wilcoxon signed-rank tests.Higher planned tumor volume post-operatively (median[IQR] 12.28 [6.54, 18.69]cc vs 10.20 [4.53, 21.70]cc respectively, p = 0.4150) was observed. The median prescribed radiotherapy dose (DRx) was 16 Gy pre-operatively and 24 Gy post-operatively (p < 0.0001). Further investigations revealed improved pre-operative conformity index (1.23[1.20, 1.29] vs 1.29[1.23, 1.39], p = 0.0098) and gradient index (2.72[2.59, 2.98] vs 2.94[2.69, 3.47], p = 0.0004). A significant difference was found in normal brain tissue exposed to 10 Gy (12.97[6.78, 25.54]cc vs 32.13[19.42, 48.40]cc, p < 0.0001), 12 Gy (9.31[4.56, 17.43]cc vs 23.80[14.74, 36.56]cc, p < 0.0001), and 14 Gy (5.62[3.23, 11.61]cc vs 17.47[9.00, 28.31]cc, p < 0.0001), favoring pre-operative SRS.Neoadjuvant SRS is associated reduced DRx, better conformality profile and decreased radiation to normal tissue. These findings could support the use of neoadjuvant SRS for the treatment of BMs." @default.
- W4288045492 created "2022-07-27" @default.
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- W4288045492 date "2023-07-01" @default.
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- W4288045492 title "Pre-operative stereotactic radiosurgery for cerebral metastatic disease: A retrospective dose-volume study" @default.
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- W4288045492 doi "https://doi.org/10.1016/j.radonc.2022.07.019" @default.
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