SYP and neoplasm: IHC results showed GFAP (Glial Fibrillary Acidic Protein): Faintly positive in some tumor cells, EMA (Epithelial Membrane Antigen): Positive for dot-like luminal cytoplasmic staining (Figure 2B,F), CAM5.2 (Calmodulin5.2): Positive in some tumor cells (mostly around vessels) (Figure 2C,G), Synaptophysin: Negative in tumor cells, S100: Weakly positive in some tumor cells (Figure 2D,H).