GFAP and neoplasm: Non-histone chromosomal protein HMG-17 (HMGN2), thymosin beta-4 (TMSB4X), 10 kDa heat shock protein (HSPE1), and the ratio between citrullinated/uncitrullinated GFAP fragment 388–432 showed significantly higher levels in ST-EPs, therefore marking the ST tumor location.