Figure 4

Immunohistochemistry for PC1 in normal and unaffected liver compared to colorectal (CRC) liver metastases. A. Light microscopy immunohistochemistry of normal liver (N), using 100 × magnification. Arrowheads indicate the scarcely positively stained hepatic cells. B. Light microscopy PC1 immunohistochemistry of liver metastasis (T) and adjacent unaffected parenchyma (U), using 20 × magnification. Arrowheads indicate positively stained tumor cells. C. Light microscopy PC1 immunohistochemistry of liver metastasis (T) using 400 × magnification. Arrowheads indicate positively stained tumor cells.