The use of fetoprotein in the diagnosis of hepatocellular carcinoma has made great progress in the diagnosis of hepatocellular carcinoma. However, the existence of “false positive” in the diagnosis of hepatocellular carcinoma has made the differential diagnosis difficult. This is because the composition and activity of the enzymes catalyzing the synthesis of glycoprotein in hepatocellular carcinoma cells have changed, resulting in changes in the structure of the glycoprotein chain. lentil agglutinin. This type of fetoprotein produced by hepatocellular carcinoma cells that can bind to lentil agglutinin is called a fetoprotein heteroplasmid. If the fetoprotein heteroplasm exceeds 25% of the total fetoprotein, it indicates elevated fetoprotein due to hepatocellular carcinoma, while if it is less than 25%, it indicates elevated fetoprotein due to other conditions.