O-18 IMPAIRED ANTI-HBV VACCINE RESPONSE IN NON-CIRRHOTIC CHRONIC HCV PATIENTS IS NOT OVERCOME BY DOUBLE DOSE REGIMEN. FOURTH DOSE MAYBE THE ANSWER!

Introduction Hepatitis B virus (HBV) vaccination is regarded as the most effective method for the prevention and control of HBV infection. Studies showed a reduced HBV vaccine response between patients with chronic hepatitis C (HCV), but studies exploring HBV vaccine efficacy in this population have equivocal results. Objectives To evaluate HBV vaccine response in patients with HCV submitted to two different (20 µg vs 40 µg in 0, 1 and 6 months) anti-HBV vaccine schemes and administer the 4th additional dose in non-responders as well as assess the maintenance of seroprotectors titers. Methods This randomized controlled trial included 141 HCV who received double dose (40ug) or standard dose (20ug) and 70 healthy volunteers who received standard dose (20ug) at 0, 1 and 6 months. Anti-HBs titers were measured at 1 month after last dose. Vaccine response was defined by anti-HBs ≥10 U/L. Non-responders received the fourth dose according to the group that were previously randomized. Multivariate regression was modeled as a logistic regression. Results 128 completed the study. Median age 51 years, 61% female, 52% White, 40% F2-3, and 75% GT1, median 6 log10 HCV RNA. Overall seroconversion rate was 76.7% (n=60) in double dose and 73.5% (n=68) in standard dose, compared to 91.2% in controls (n=68). 23 patients received the fourth dose; 7 seroconverted (30.4%) and seroconversion rate for double and standard doses were 42.9% and 11.1%, respectively (p=0.18). Controlling for confounders, only older age (p Conclusion In HCV-infected patients without cirrhosis, responses to HBV vaccination are significantly impaired and this reduced response cannot be overcome by the use double dose. Besides that, 4th dose HBV vaccination can be a strategy efficacious this vulnerable population.