Chordoma : S100 Protein
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![Bone_Chordoma_S100_6.jpg](/slides-13/slides/Bone_Chordoma_S100_6.jpg)
Comments:
Chordoma - Immunophenotype: Chordomas express brachyury, cytokeratin AE1/AE3, EMA, S100 protein, SOX9 and vimentin. CEA and GFAP are variably positive. With GFAP, reactivity is usually seen with polyclonal antibodies and less often with monoclonal antibodies. Poorly-differentiated chordomas show loss of SMARCB1/INI1 staining.