Fig. 7

Immunohistochemical staining of all three surgical specimens showed similar staining properties. Sigmoid colon cancer resected in 1993 (a) was negative for CK7 and positive for CK20. The intrabiliary tumor in 2002 (b) and the intrapancreatic bile duct tumor in 2014 (c) were also negative for CK7 and positive for CK20