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A, Hematoxylin and eosin-stained section of pancreatic NET (20 × magnification). B, Immunohistochemistry for chromogranin A (20 × magnification; brown color). C, Immunohistochemistry for synaptophysin (20 × magnification; brown color). D, Immunohistochemistry for PTEN showing strong cytoplasmic staining of tumor cells (brown color) with absent nuclear staining.
