Pre-S1 Mutations as Indicated by Serum Pre-S1 Antigen Negative is Associated with an Increased Risk of Hepatocellular Carcinoma in Chronic Hepatitis B Patients

OBJECTIVE: Pre-S1 antigen (pre-S1) is a component of hepatitis B virus large surface antigen (L-HBsAg). This study aimed to investigate the association between clinical pre-S1 antigen (pre-S1) status and adverse prognostic events in chronic hepatitis B (CHB) patients. METHODS: This study retrospectively enrolled 840 CHB patients with comprehensive clinical data, including 144 patients with multiple follow-up of pre-S1 status. All patients were tested for serum pre-S1 and divided into pre-S1 positive and negative groups. Single factor and logistic multiple regression analyses were performed to explore the association between pre-S1 and other HBV biomarkers with the risk of hepatocellular carcinoma (HCC) in CHB patients. The pre-S1 region sequences of HBV DNA were obtained from one pre-S1 positive and two pre-S1 negative treatment-naïve patients using polymerase chain reaction (PCR) amplification followed by Sanger sequencing. RESULTS: The quantitative HBsAg level was significantly higher in the pre-S1 positive group than that in the pre-S1 negative group (Z=−15.983, P<0.001). The positive rate of pre-S1 increased significantly with the increase in HBsAg level (χ(2)=317.963, P<0.001) and HBV DNA load (χ(2)=15.745, P<0.001). The pre-S1 negative group had a higher HCC risk than the pre-S1 positive group (Z=−2.00, P=0.045, OR=1.61). Moreover, patients in the sustained pre-S1 negative group had a higher HCC risk (Z=−2.56, P=0.011, OR=7.12) than those in the sustained pre-S1 positive group. The sequencing results revealed mutations in the pre-S1 region from samples of pre-S1 negative patients, including frameshift and deletion mutations. CONCLUSION: Pre-S1 is a biomarker that indicates the presence and replication of HBV. Pre-S1 sustained negativity attributed to pre-S1 mutations in CHB patients may be associated with a higher risk of HCC, which has clinical significance and warrant further investigations.