GFAP and neoplasm: The tumor cells are immunoreactive for S-100 proteins, calretinin, NSE, laminin and CD68 (Kp1) (Vered et al. 2009; Rosai 2004; Weiss 2007), but they do not react with antibodies for neurofilaments or glial fibrillary acidic protein (GFAP) (Rosai 2004; Ordenez 1999; Weiss 2007).