Fig. 1

Pathological features and MK expression in combined hepatocellular cholangiocarcinoma (CHCC-CC). Microscopically, the tumor was diagnosed as CHCC-CC with HE staining (a). Adjacent non-cancerous tissue showed no MK expression (b). Because the HCC component was positive with hep1 but negative with CK7 (c). Conversely, ICC component was positive with CK7 but negative with hep1 (d). Positive MK expression in some CHCC-CC tissues (e). Negative MK expression in some CHCC-CC tissues (f)