MIB1 and meningioma: While the MIB-1 labeling indices of the high proliferative Grade 2 meningiomas (median = 8.1; Range = 7.5–8.0) were higher than the low-proliferative Grade 2 meningiomas (median = 5.1; Range = 3.7–7.0), larger sample numbers are required to confirm this trend.