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Low-Dose Gamma Knife Radiosurgery for Vestibular Schwannomas: Tumor Control and Cranial Nerve Function Preservation After 11 Gy
- Publication Year :
- 2016
- Publisher :
- Georg Thieme Verlag KG, 2016.
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Abstract
- Objectives This study aims to report tumor control rates and cranial nerve function after low dose (11.0 Gy) Gamma knife radiosurgery (GKRS) in patients with vestibular schwannomas. Methods A retrospective chart review was performed on 30 consecutive patients with vestibular schwannomas treated from March 2004 to August 2010 with GKRS at the Robert H. Lurie Comprehensive Cancer Center of Northwestern University. The marginal dose for all patients was 11.0 Gy prescribed to the 50% isodose line. Median follow-up time was 42 months. The median treatment volume was 0.53 cm 3 . Hearing data were obtained from audiometry reports before and after radiosurgery. Results The actuarial progression free survival (PFS) based on freedom from surgery was 100% at 5 years. PFS based on freedom from persistent growth was 91% at 5 years. One patient experienced tumor progression requiring resection at 87 months. Serviceable hearing, defined as Gardner–Robertson score of I–II, was preserved in 50% of patients. On univariate and multivariate analyses, only higher mean and maximum dose to the cochlea significantly decreased the proportion of patients with serviceable hearing. Conclusion Vestibular schwannomas can be treated with low doses (11.0 Gy) of GKRS with good tumor control and cranial nerve preservation.
- Subjects :
- medicine.medical_specialty
medicine.diagnostic_test
business.industry
medicine.medical_treatment
Low dose
Gamma knife radiosurgery
Cancer
Neuroma
medicine.disease
Radiosurgery
Surgery
03 medical and health sciences
0302 clinical medicine
Tumor progression
030220 oncology & carcinogenesis
medicine
otorhinolaryngologic diseases
Neurology (clinical)
Progression-free survival
sense organs
Audiometry
business
030217 neurology & neurosurgery
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....a4ed20acd022f226cf90e318b0a634ae