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• W2791522109 abstract "Purpose: Repeat stereotactic radiosurgery (SRS) is an attractive alternative to whole brain radiation therapy (WBRT) for treatment of recurrent brain metastases (BM). The purpose of this study is to determine the cumulative doses to the brain and critical normal structures in patients who underwent repeat courses of Gamma Knife (GK) SRS. Materials and Methods: We retrospectively identified ten patients who received at least 3 GK-SRS sessions for multiply recurrent BM at our institution from 2013 to 2016. We used VelocityTM 3.1.0 software to co-register the MRI images and the dose data of all treatment sessions for each patient. The cumulative doses to brain, lenses, eyes, brainstem, optic nerves, chiasm, and hippocampi were calculated. Dose-volume histograms, as well as the mean and maximum doses of these structures, were analyzed. Results: The median number of SRS was 5 sessions (range = 3 - 7 sessions) per patient over a median treatment span of 510 days (112 - 1197 days), whereas the median number of metastatic tumors treated per patient was 25.0 (10 - 63). The median of the total tumor volume was 9.5 cc (2.3 - 75.9 cc). The median of the mean cumulative dose to the whole brain was 4.1 Gy (1.7 - 16.4 Gy). The medians of the maximum doses to the critical structures were as follows: brainstem, 6.1 Gy (2.2 - 28.9 Gy), chiasm, 3.9 Gy (1.8 - 10.8 Gy), right optic nerve, 2.9 Gy (1.2 - 9.0 Gy), and left optic nerve, 2.6 Gy (1.0 – 6.5 Gy). The medians of the mean and maximum cumulative doses to the hippocampi were 3.4 Gy (1.0 – 14.4 Gy) and 13.8 Gy (1.5 - 39.3 Gy) respectively. The median survival for the entire cohort was 26.7 months, and no patients developed radiation necrosis. Conclusions: Our study demonstrated that multisession GKSRS could be delivered with low cumulative doses to critical normal structures. Further studies are required to fully establish its role as an alternative treatment strategy to WBRT for the treatment of multiply-recurrent BM." @default.
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• W2791522109 date "2018-03-13" @default.
• W2791522109 modified "2023-10-03" @default.
• W2791522109 title "Cumulative Doses to Brain and Other Critical Structures After Multisession Gamma Knife Stereotactic Radiosurgery for Treatment of Multiple Metastatic Tumors" @default.
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• W2791522109 doi "https://doi.org/10.3389/fonc.2018.00065" @default.
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