The preS1 region of the large hepatitis B virus (HBV) surface protein is a crucial component in HBV infection; however, its impact on the development of hepatocellular carcinoma (HCC) remains unknown. This study investigated the relationship between serum preS1 levels and hepatocarcinogenesis in patients with chronic hepatitis B (CHB). The preS1 levels were measured in 531 patients with CHB without a history of HCC. Among the patients, 293 HBV carriers who had never received nucleotide/nucleoside analog (NA) therapy had their preS1 levels measured at their first visit (non-NA group), and 238 patients who had received NA therapy had their preS1 levels measured at the start of NA administration (NA group). The two groups had no significant differences in hepatitis B surface antigen (HBsAg) levels; however, the NA group’s preS1/HBsAg ratio was significantly higher. The preS1/HBsAg ratio was significantly different between patients with CHB not meeting the NA treatment criteria and patients with chronic hepatitis and cirrhosis who were eligible for NA treatment. The predictors of HCC development were analyzed, and the preS1/HBsAg ratio was identified in both groups. The preS1/HBsAg ratio could predict hepatocarcinogenesis in patients with CHB with or without NA administration.
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