MKI67 and meningioma: The effect of WHO grade on the Ki-67 scores of the 42 patients was analyzed; while there was no significant difference between the initial Ki-67 index scores of the WHO grade I and WHO grade II groups (p=0.113), a noteworthy trend for significance existed between the second Ki-67 index scores of the two groups, with WHO grade II grade meningiomas having a higher proliferative index (8.1 ± 1.2% versus 16.9 ± 4.5%, p=0.051).