MKI67 and neoplasm: is the most generally used immunohistochemical marker to detect a meningioma.[8] Nevertheless, the somatostatin receptor 2A has proven to more a superior immunostain target.[6,22] Ki-67 labeling index is often used to quantify proliferative cells within a tumor while MIB-1 monoclonal antibody is used to stain the Ki-67 antigen.[23,24]