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Patterns of failure after treatment of atypical meningioma with gamma knife radiosurgery

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Abstract

Atypical meningiomas have poor local control with emerging literature indicating the use of radiosurgery in treatment. The purpose of this study was to evaluate clinical outcomes including local control and failure pattern after Gamma Knife radiosurgery (GKRS) and factors that may affect these outcomes. Between 1999 and 2008, 24 patients were treated with GKRS as either primary or salvage treatment for pathologically proven atypical meningiomas. Treatment failures were determined by serial magnetic resonance imaging. A median marginal dose of 14 Gy was used (range 10.5–18 Gy). Overall local control rates at 1, 2, and 5 years were 75, 51, and 44%, respectively. With median follow-up time of 42.5 months, 14 of 24 patients experienced a treatment failure at time of last follow-up. Eight recurrences were in-field, four were marginal failures, and two were distant failures. Wilcoxon analysis revealed that the conformality index (CI) was a significant predictor of local recurrence (P = 0.04). CI did not predict for distant recurrences (P = 0.16). On multivariate analysis evaluating factors predicting progression free survival, dose >14 Gy was found to be statistically significant (P = 0.01). There appears to be a dose response using GKRS beyond 14 Gy but given the suboptimal local control rates in this study, higher doses may still be needed to obtain better local control.

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None of the authors has any personal, financial, or professional conflicts of interest to report.

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Correspondence to Albert Attia.

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Attia, A., Chan, M.D., Mott, R.T. et al. Patterns of failure after treatment of atypical meningioma with gamma knife radiosurgery. J Neurooncol 108, 179–185 (2012). https://doi.org/10.1007/s11060-012-0828-1

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  • DOI: https://doi.org/10.1007/s11060-012-0828-1

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