Abstract
MDR1 RNA levels were analysed in patients with hepatocellular carcinoma (HCC), benign liver tumors or cirrhosis. None of the patients with HCC had received chemotherapy. MDR1 RNA levels were increased relative to a normal liver specimen in 15/26 liver cancers, 2/6 benign liver tumors and 0/8 tumor-free cirrhotic livers. MDR1 was also overexpressed in cirrhotic non-tumorous liver tissues of some patients with HCC. The results indicate that the MDR1 gene is overexpressed in liver tumors and some preneoplastic lesions and that might account for the very poor response of primary liver cancers to chemotherapy.
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