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Immunohistochemical staining for cases 4 and 6. Case 4 showed discordance for SATB2 between gallbladder cancer (GBC) and colorectal cancer (CRC), whereas case 6 showed discordance for CK7, CDX2 and SATB2 between GBC and CRC. H&E, haematoxylin and eosin; CK7, cytokeratin 7; CK20, cytokeratin 20; CDX2, caudal type homeobox 2; SATB, homeobox 2.
