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In this study 90% of rectal well differentiated neuroendocrine tumors (A, B) showed positive staining for SATB2 with most of them showing diffuse staining (C). The normal rectal mucosal epithelium showed diffuse SATB2 staining (C). This tumor was negative for CDX2 (D). Normal rectal mucosal epithelium was positive for CDX2.
