GFAP and astrocytoma (excluding glioblastoma): In grade I to IV astrocytomas, GFAP and vimentin are co-expressed but in different cellular compartments: indeed, while vimentin is located closer to cell nucleus, GFAP is preferentially detected in cellular processes (Bordey and Sontheimer, 1998, Cosgrove et al., 1989, Herpers et al., 1986).