APOA1 and meningioma: Apart from the members of complement and coagulation cascades and integrin signaling pathway, expression levels of quite a few serum proteins including apolipoprotein A-I, A-II, A-IV, B-100, C-II and E, and serum albumin associated with metabolism of lipids and lipoproteins were found to be altered in the meningioma patients; particularly in atypical and anaplastic meningiomas (Table 2).