Part of the SEGA tumor-forming cells shows astroglial differentiation, reflected by immunoreactivity of glial fibrillary acidic protein (GFAP) and S100, whereas beta-tubulin class III protein and features of neuronal differentiation in the form of expression of neurofilament proteins and neuron-specific enolase are present in a distinct subpopulation of tumor cells [1]. This evidence concerns the gene GFAP and neoplasm.