We next assessed the expression levels of cyclin D1 and p27kip1, which are two proteins involved in the cell cycle, that are modulated by SSAs in neuroendocrine tumors [18] and expressed in meningiomas [21, 22] by western blotting in eight meningioma samples (six WHO grade I and two WHO grade II). Here, CDKN1B is linked to neuroendocrine neoplasm.