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Hepatitis B surface antigen (HBsAg) is an important marker of HBV infection and HBsAg quantification could be a useful tool in clinical practice. This systematic literature review aimed to explore the association between HBsAg titres and long\u2010term disease outcomes and evaluate the relationship between HBsAg titres, or changes in HBsAg titres, and clinical and treatment characteristics in patients with chronic HBV infection. Structured searches were performed in MEDLINE and Embase (January 2000 to 31 March 2023). Eighty\u2010two studies were included, comprising 51% retrospective cohort studies, mostly conducted in Asia (85%). HBsAg levels were shown to predict the long\u2010term development of cirrhosis and HCC in patients who were untreated prior to and during follow\u2010up; however, these data were inconclusive in mixed and treated populations. HBsAg titres were significantly associated with various virological markers including serum HBV DNA, HBcrAg, HBeAg, HBV RNA levels, intrahepatic covalently closed circular DNA (cccDNA) and intrahepatic HBsAg expression. HBsAg titres generally declined over time; this decline was more pronounced in early (HBeAg\u2010positive) than later disease phases (HBeAg\u2010negative). Higher decline in HBsAg levels was consistently associated with subsequent HBsAg seroclearance and a greater decline in total intrahepatic HBV DNA and cccDNA levels. In conclusion, this review showed that HBsAg levels and rates of decline could inform assessment, management and prediction of outcomes in chronic HBV infection. Further studies in broader, more diverse populations and treated patients are needed.<\/jats:p>","DOI":"10.1111\/jvh.13988","type":"journal-article","created":{"date-parts":[[2024,8,16]],"date-time":"2024-08-16T07:46:29Z","timestamp":1723794389000},"page":"746-759","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Association of Hepatitis B Surface Antigen Levels With Long\u2010Term Complications in Chronic Hepatitis B Virus Infection: A Systematic Literature Review"],"prefix":"10.1111","volume":"31","author":[{"given":"Anadi","family":"Mahajan","sequence":"first","affiliation":[{"name":"Bridge Medical Consulting Ltd  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Saifuddin","family":"Kharawala","sequence":"additional","affiliation":[{"name":"Bridge Medical Consulting Ltd  London 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