Abstract
Purpose
Vestibular schwannomas (VSs) are comparatively rare in younger patients, and stereotactic radiosurgery (SRS) outcome data are limited. We aimed to evaluate long-term SRS outcomes concerning sporadic VSs in patients aged ≤ 40 years.
Methods
Of 383 patients with VS who had undergone SRS at our institution between 1990 and 2017, we retrospectively compared younger and older patients’ tumor control and radiation-induced complication rates using case–control propensity score (PS) matching.
Results
The mean follow-up was 83 and 92 months in older and younger patients, respectively. Compared with older patients, younger patients were more likely to have a history of resection (20% vs. 39%, p = 0.006) and be treated with higher marginal doses (median, 12 Gy vs. 14 Gy; p = 0.014). Cumulative 5- and 10-year tumor control rates were higher in older patients (97.7% and 93.9%, respectively) than in younger patients (90.2% and 85.4%, respectively, p = 0.024). After PS matching, younger patients’ cumulative tumor control rates (93.6%, 85.4%, and 85.4% at 5, 10, and 15 years, respectively) were similar to those of older patients (p = 0.411). No significant between-cohort differences in hearing preservation rates or other cranial nerve complications were observed. Two younger patients had malignant tumors several years post-SRS, with one patient having confirmed histological transformation.
Conclusions
SRS is equally effective for younger and older patients. Complications other than hearing deterioration are uncommon. However, malignant transformation is possible, and long-term post-SRS surveillance MRI is important. These data are useful for decision-making involving young adults with VSs.
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Data availability
The data supporting the findings of this study are included in the article and its supplementary material file.
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MK and HH conceived and designed the study. MK conducted the literature search. MK, HH, YS, AK, MS and NS were involved in the analysis and interpretation of data. MK and HH drafted the manuscript. The study was supervised by MS and NS. All authors read and approved the final manuscript.
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Kawashima, M., Hasegawa, H., Shin, M. et al. Outcomes of stereotactic radiosurgery in young adults with vestibular schwannomas. J Neurooncol 154, 93–100 (2021). https://doi.org/10.1007/s11060-021-03803-w
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DOI: https://doi.org/10.1007/s11060-021-03803-w