Fig. 4From: Metastatic rectal adenocarcinoma in the mandibular gingiva: a case reportImmunohistochemical staining of the metastatic oral tumor showing tumor cells negative for CK7 (a), positive for CK20 (b), and positive for CDX2 (c) (original magnifications for all images, ×200; scale bar, 100 μm)Back to article page