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Resected WHO grade I meningioma and predictors of local control

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Abstract

Introduction

Despite optimal surgical resection, meningiomas may recur, with increasing grade and the degree of resection being predictive of risk. We hypothesize that an increasing Ki67 correlates with a higher risk of recurrence of resected WHO grade I meningiomas.

Methods

The study population consisted of patients with resected WHO grade 1 meningiomas in locations outside of the base of skull. Digitally scanned slides stained for Ki67 were analyzed using automatic image analysis software in a standardized fashion.

Results

Recurrence was observed in 53 (17.7%) of cases with a median follow up time of 25.8 months. Ki67 ranged from 0 to 30%. Median Ki67 was 5.1% for patients with recurrence and 3.5% for patients without recurrence. In unadjusted analyses, high Ki-67 (≥ 5 vs. < 5) vs. ≥ 5) was associated with over a twofold increased risk of recurrence (13.1% vs. 27% respectively; HR 2.1731; 95% CI [1.2534, 3.764]; p = 0.006). After Adjusting for patient or tumor characteristics, elevated Ki-67 remained significantly correlated with recurrence. Grade 4 Simpson resection was noted in 71 (23.7%) of patients and it was associated with a significantly increased risk of recurrence (HR 2.56; 95% CI [1.41, 4.6364]; p = 0.002).

Conclusions

WHO grade 1 meningiomas exhibit a significant rate of recurrence following resection. While Ki-67 is not part of the WHO grading criteria of meningiomas, a value greater than 5% is an independent predictor for increased risk of local recurrence following surgical resection.

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Correspondence to Joshua D. Palmer.

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Institutional IRB approval was obtained for the retrospective review of patient charts.

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Kamila Nowak Choi and Joshua D. Palmer contributed equally to the published work.

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Nowak-Choi, K., Palmer, J.D., Casey, J. et al. Resected WHO grade I meningioma and predictors of local control. J Neurooncol 152, 145–151 (2021). https://doi.org/10.1007/s11060-020-03688-1

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  • DOI: https://doi.org/10.1007/s11060-020-03688-1

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