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Otol Neurotol. 2012 Aug;33(6):1046-52. doi: 10.1097/MAO.0b013e31825e73f5.

Bevacizumab for progressive vestibular schwannoma in neurofibromatosis type 2: a retrospective review of 31 patients.

Author information

1
Department of Neurology and Cancer Center, Massachusetts General Hospital, Boston 02114, USA. splotkin@partners.org

Abstract

OBJECTIVE:

Early studies suggest that bevacizumab treatment can result in tumor shrinkage and hearing improvement for some patients with neurofibromatosis type 2 (NF2). The aim of this study was to report extended follow-up in a larger cohort of similarly treated patients.

STUDY DESIGN:

Retrospective study.

SETTING:

Tertiary referral center

PATIENTS:

Thirty-one consecutive NF2 patients who received bevacizumab for progressive vestibular schwannomas.

MAIN OUTCOME MEASURE:

Hearing improvement, defined as an improvement in word recognition score above the 95% critical difference compared with baseline, and radiographic response, defined as a 20% or greater decrease in tumor volume compared with baseline.

RESULTS:

The median age was 26 years (range, 12-73 yr). The median volumetric tumor growth rate before treatment was 64% per year. At the time of analysis, the median duration of treatment was 14 months (range, 6-41 mo) with a total of 47 patient-years of follow-up. A hearing response occurred in 57% (13/23) of evaluable patients and a radiographic response in 55% (17/31) of target vestibular schwannomas. The median time to response was 3 months for both end points. The only clinical or radiographic feature at baseline that correlated with change in tumor volume at 3 months was the mean apparent diffusion coefficient value, a radiologic marker of edema (p = 0.036). Ninety percent of patients had stable or improved hearing after 1 year of treatment and 61% at 3 years; 88% of patients had stable or decreased tumor size after 1 year of treatment and 54% at 3 years. Overall, treatment was well tolerated.

CONCLUSION:

Bevacizumab treatment was followed by hearing improvement and tumor shrinkage in more than 50% of progressive vestibular schwannomas in NF2 patients. Stable or improved hearing was retained in the majority of patients.

PMID:
22805104
DOI:
10.1097/MAO.0b013e31825e73f5
[Indexed for MEDLINE]

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