Infection with hepatitis B virus (HBV) is associated with the risk for nonliver cancer, particularly digestive system cancers, according to a study published in JAMA Network Open.1
HBV is one of the most serious and prevalent health conditions in the world, and the cause of up to 80% of cases of hepatocellular carcinoma, particularly in Chinese and African populations.2,3 A few clinical case studies have detected HBV in several types of nonliver tissues, suggesting that HBV may play a role in the oncogenesis of nonliver cancers.4-6 However, few population-based studies have observed associations between chronic HBV infection and various nonliver cancers7-11; therefore, researchers assessed the associations between chronic HBV infection and risk for all cancer types in a population-based study involving 496,732 Chinese individuals.1 They found that hepatitis B surface antigen (HBsAg) seropositivity (n=15,355) was associated with the risk for hepatocellular carcinoma (hazard ratio [HR], 15.77; 95% CI, 14.15-17.57), stomach cancer (HR, 1.41; 95% CI, 1.11-1.80), colorectal cancer (HR, 1.42; 95% CI, 1.12-1.81), oral cavity cancer (HR, 1.58; 95% CI, 1.01-2.49), pancreatic cancer (HR, 1.65; 95% CI, 1.03-2.65), and lymphoma (HR, 2.10; 95% CI, 1.34-3.31) compared with patients who were HBsAg seronegative (n=481,377). These associations were further validated in independent population- and tissue-based studies.
The authors concluded that, “In a large prospective Chinese cohort of 496 732 adults, we found that participants who were HBsAg seropositive were at an increased risk of developing [hepatocellular carcinoma] and several nonliver cancers, including stomach cancer, oral cancer, colorectal cancer, pancreatic cancer, and lymphoma.”1
1. Song C, Lv J, Liu Y, et al. Associations between hepatitis B virus infection and risk of all cancer types. JAMA Network Open. 2019;2(6):e195718.
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