Immunohistochemical expression of metallothionein in resected hepatic primary tumors and colorectal carcinoma metastases

Metallothionein is a protein with affinity for metals and is present in sev eral tumors. We examined its immunohistochemical expression in 37 resected primary liver tumors and 117 colorectal metastases. The reaction was intens e in the two fibrolamellar hepatocellular carcinomas and in many of the hep atocytes of the pseudotumor case of focal nodular hyperplasia. The reaction was low or moderate in 5 of 17 ordinary hepatocellular carcinomas and in 4 of 14 cholangiocellular carcinomas. There was no reaction in one case each of spindle cell hepatocellular carcinoma, oncocytic adenoma and hemangioen dothelial sarcoma. In the metastases, the reaction was low or moderate in 1 4 cases and negative in 103. Surrounding hepatocytes and stromal cells were more or less positive in all cases.