Abstract
Purpose
Clear cell meningioma (CCM) is a rare WHO grade II meningioma variant, characterized by aggressive features and a high tumor recurrence rate. In this study, we compared overall and progression-free survivals between CCMs and other WHO grade II meningiomas.
Methods
A retrospective institutional database review was performed to identify all patients who underwent surgical resection of a WHO grade II meningioma between 1997 and 2019. Overall survival and progression-free survival were compared between patients with clear cell meningiomas and patients with other WHO grade II meningiomas. Multivariable Cox proportional-hazards analysis was used to identify independent predictors of tumor recurrence and survival.
Results
We included a total of 214 patients in this study (43 CCMs, 171 other WHO grade II meningiomas). Patients with CCMs had significantly shorter progression-free (p = 0.001) and overall (p = 0.026) survivals than patients with other grade II meningiomas. In multivariable analysis, clear cell histology was a significant and powerful independent predictor of tumor recurrence (HR 1.93; 95% CI 1.14–3.26) when controlling for tumor location, extent of resection, and adjuvant radiation. In multivariable analysis, clear cell histology correlated with increased mortality (HR 1.96, 95% CI 0.97–3.94), though this was not statistically significant.
Conclusion
This is the first study to compare overall and progression-free survivals between CCMs and other WHO grade II meningiomas. Clear cell histology predicts a higher risk of tumor recurrence and mortality than other grade II histologies. Future studies may help to understand the impact of these findings and the treatment implications.
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Code availability
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Gene H. Barnett (consultant, Monteris Medical, Inc.), Pablo F. Recinos (consultant, Stryker), Varun R. Kshettry (consultant, Integra and Stryker).
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Soni, P., Shao, J., Momin, A. et al. Clear cell histology portends a worse prognosis than other WHO grade II histologies. J Neurooncol 151, 307–312 (2021). https://doi.org/10.1007/s11060-020-03668-5
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DOI: https://doi.org/10.1007/s11060-020-03668-5