The receptors of peanut agglutinin (PNA), Dolichos biflorus agglutinin (DBA) and Ulex europaeus agglutinin I (UEA-I) were localized in intrahepatic cholangiocellular carcinoma, hepatocellular carcinoma, intrahepatic bile ducts and normal, cirrhotic and pericarcinomatous liver using the avidin-biotin-peroxidase complex method. It was found that epithelial cells of normal bile ducts had many UEA-I receptors, fewer DBA receptors and no PNA receptors. The positive rates of PNA, UEA-I and DBA receptors in 18 cases of intrahepatic cholangiocellular carcinoma were 88.9%, 61.1% and 33.3% respectively, which were significantly higher than those in hepatocellular carcinoma (16.0%, 4.0% and 4.0% respectively). Hepatocytes in normal, cirrhotic and pericarcinomatous liver had no receptors for these three lectins. It is suggested that lectin receptor distribution in intrahepatic cholangiocellular carcinoma is obviously different from that in normal bile duct cells and in hepatocellular carcinoma, and might be used as an auxiliary index in its clinical diagnosis.
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