Background: Patients on regular dialysis show a poor response to hepatitis B vaccine due to uremia. A recombinant HB vaccine (containing an improved adjuvant system AS04, HBV-AS04) has been licensed but the evidence on its efficacy and safety in dialysis population over the long term is extremely limited. Aim: We have measured antibody (anti-HBs) persistence for up to 72 months in a large cohort of patients on long-term dialysis (with susceptibility to HBV infection) who underwent vaccination with HBV-AS04 vaccine. Methods: Patients were prospectively recruited to receive four 20-mcg doses of HBV-AS04 by intramuscular route (deltoid muscle). Two vaccine schedules were adopted: 0,1,2, and 3 month (n = 217 patients) and 0,1,2, and 6 month (n = 31 patients). Anti-HBs antibody concentrations were tested at 1,2,3, 4, 7 and 12 months and then every year up to 72 months. Multivariate analysis was made to find the baseline parameters that were associated with the immune response to HBV-AS04 vaccine. Results: Two hundred and seventy-two patients were included and 248 completed the study. At completion of vaccine schedule, the frequency of responders (anti-HBs titers ≥ 10 mIU/mL) was 81.5% (202/248) (mean anti-HBs antibody titers, 384.9 ± 391.9 mIU/mL), according to per-protocol analysis. On the grounds of univariate analysis, age was lower in responder than non- responder patients to HBV AS04 even if no statistical significance was achieved (P = 0.09). The sero-protection rate at month 72 was 77% (7/9) (anti-HBs antibody titers, 184.9 ± 360.1 mIU/mL, P = 0.001). Multivariate analysis found a relationship between sero-response rate and age (P = 0.04). No major side effects and no de novo HBV episodes were observed. Conclusions: Our open-label nonrandomized trial performed in a ‘real-world’ practice showed the persistence of anti-HBs antibody among responder patients over a very long follow-up. Studies with longer observation periods are under way.
|Journal||Clinics and Research in Hepatology and Gastroenterology|
|Publication status||Accepted/In press - Jan 1 2020|
- Hepatitis B vaccine
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