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CyberKnife for Treatment of Vestibular Schwannoma: A Meta-analysis.

Authors
  • Mahboubi, Hossein1
  • Sahyouni, Ronald1, 2
  • Moshtaghi, Omid1
  • Tadokoro, Kent1
  • Ghavami, Yaser1
  • Ziai, Kasra1
  • Lin, Harrison W1
  • Djalilian, Hamid R1, 2
  • 1 1 Division of Neurotology and Skull Base Surgery, Department of Otolaryngology-Head and Neck Surgery, University of California, Irvine, California, USA.
  • 2 2 Department of Biomedical Engineering, University of California, Irvine, California, USA.
Type
Published Article
Journal
Otolaryngology
Publisher
SAGE Publications
Publication Date
Jul 01, 2017
Volume
157
Issue
1
Pages
7–15
Identifiers
DOI: 10.1177/0194599817695805
PMID: 28441508
Source
Medline
Keywords
License
Unknown

Abstract

Objectives (1) Perform a meta-analysis of the available data on the outcomes of CyberKnife radiosurgery for treatment of vestibular schwannomas (VSs) in the published English-language literature and (2) evaluate the collective outcomes of CyberKnife treatment with respect to tumor control and hearing preservation. Data Sources A thorough literature search of published English-language articles was performed in the PubMed, Ovid, and Cochrane databases. Review Methods A database search was conducted with the keywords "CyberKnife" and "vestibular schwannoma" or "acoustic neuroma." A total of 25 papers were found and reviewed. Data were extracted for patient demographics, number of patients with neurofibromatosis type 2, pretreatment hearing status, tumor size, margin dose, and follow-up duration. The primary outcome variables evaluated were tumor control and hearing preservation. Results After careful review of the published articles, 11 papers reported data on outcomes of CyberKnife treatment for VS and were included in the analysis, comprising 800 patients studied during 1998 to 2012. The reported mean tumor volume ranged from 0.02 to 19.8 cm3, and the follow-up duration ranged from 6 to 120 months. Margin dose varied from 14 to 25 Gy. The collective mean tumor control rate was 96.3% (95% CI: 94.0%-98.5%). The collective hearing preservation rate was 79.1% (95% CI: 71.0%-87.3%) in 427 patients with measurable hearing. Conclusion Clinical data on outcomes of CyberKnife radiosurgery for treatment of VSs are sparse and primarily limited to single-institution analyses, with considerable variation in tumor volume and follow-up time. This meta-analysis not only provides an in-depth analysis of available data in the literature but also reviews reported outcomes and complications.

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