These results suggest that primary CRCs and their liver metastases show common histological features.

Matching primary CRCs and liver metastases from 33 patients were analyzed for T-Ag expression by immunohistochemistry.

We have demonstrated in this report that a proportion of primary CRCs resected at our institution were indeed "flat."

Paraffin blocks of 155 primary CRCs and 37 nodal metastases were retrieved and tissue microarrays were constructed.