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Stereotactic Radiation for Palliation of Skull Base Recurrences of Salivary Gland Carcinomas: Implications for Tumor Targeting.
Journal of Neurological Surgery. Part B, Skull Base 2017 Februrary
Background Approximately 3 to 13% of salivary carcinomas recur at the skull base. We report our experience treating these recurrences with stereotactic radiation. Methods In total, 14 patients with skull base recurrence of salivary gland carcinoma were identified. Patient characteristics, treatment parameters, response to treatment, local recurrence-free/overall survival, and patterns of failure were studied. Results All 12 symptomatic patients experienced palliation of symptoms. Two grade 3 toxicities were observed. Local recurrence-free survival after skull base treatment was 28 months (74 months after allowing for additional course of salvage radiotherapy). Overall survival was 153 months from primary diagnosis and 67 months from first skull base failure. Of 13 treatment failures, 8 occurred at margins; the rest were infield. All intracranial failures occurred along meningeal surfaces. Conclusions Stereotactic radiation provides well-tolerated palliation for the majority of patients, but with a high rate of local failure. Due to the propensity for meningeal failures, we suggest increasing margins along the meningeal surfaces when treating these patients.
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