Fig. 4From: Gastric cancer simultaneously complicated with extrahepatic bile duct metastasis and portal vein tumor thrombus: a case reportImmunohistochemical staining. Gastric cancer was negative for cytokeratin 7 (CK7) (a; × 100), and positive for CK20 (b; × 200). The results of the bile duct tumor were consistent with those of gastric cancer (c; × 100, d; × 200)Back to article page