In a Gastroenterology study from Taiwan, HBV vaccination has been shown to reduce the risk of Hepatocellular Carcinoma.
Of the 1509 patients with HCC, 1343 were born before, and 166 were born after, the HBV vaccination program began. HCC incidence per 105 person-years was 0.92 in the unvaccinated cohort and 0.23 in the vaccinated birth cohorts. The RRs for HCC in patients 6–9 years old, 10–14 years old, 15–19 years old, and 20–26 years old who were vaccinated vs unvaccinated were 0.26 (95% confidence interval [CI], 0.17–0.40), 0.34 (95% CI, 0.25–0.48), 0.37 (95% CI, 0.25–0.51), and 0.42 (95% CI, 0.32–0.56), respectively. The RR for HCC in 6- to 26-year-olds was lower in the later vs the earlier cohorts (born in 1992–2005 vs 1986–1992; P < .001 and 1986–1992 vs 1984–1986; P < .002). Transmission of HBV from highly infectious mothers and incomplete immunization were associated with development of HCC.