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IHC staining of the mediastinal mass (×400). The tumor cells were weakly positive for CK and Syn (A,B), partially and strongly positive for CGA (C), and diffusely and strongly positive for Gly-3 (D). The Ki67 proliferation index was approximately 50% (E). IHC, immunohistochemical; CK, cytokeratin; Syn, synaptophysin; CGA, chromogranin A; Gly-3, glypican-3.
