Background: To evaluate co-administration of GlaxoSmithKline Biologicals' human papillomavirus-16/18 AS04-adjuvanted vaccine (HPV) and hepatitis B vaccine (HepB).
Methods: This was a randomized, controlled, open, multicenter study. Healthy girls, aged 9-15 years, were randomized to receive HPV (n=247), HepB (n=247) or HPV co-administered with HepB (HPV+HepB; n=247) at Months 0, 1 and 6. Antibodies against hepatitis B surface antigen (HBs), HPV-16 and HPV-18 were measured, and reactogenicity and safety monitored. Co-primary objectives were to demonstrate non-inferiority of hepatitis B and HPV-16/18 immune responses at Month 7 for co-administered vaccines, compared with vaccines administered alone, in the according-to-protocol cohort.
Results: The pre-defined criteria for non-inferiority were met for all co-primary immunogenicity endpoints at Month 7. Anti-HBs seroprotection rates ≥10mIU/mL were achieved by 97.9% and 100% of girls, respectively, following co-administration or HepB alone. Anti-HBs geometric mean titers (GMTs) (95% confidence interval) were 1280.9 (973.3-1685.7) and 3107.7 (2473.1-3905.1) milli-international units/mL, respectively. Anti-HPV-16 and -18 seroconversion rates were achieved by ≥99% of girls following co-administration or HPV alone. Anti-HPV-16 GMTs were 19819.8 (16856.9-23303.6) and 21712.6 (19460.2-24225.6) ELISA units (ELU)/mL, respectively. Anti-HPV-18 GMTs were 8835.1 (7636.3-10222.1) and 8838.6 (7948.5-9828.4) ELU/mL, respectively. Co-administration was generally well tolerated.
Conclusions: The study results support the co-administration of HPV-16/18 AS04-adjuvanted vaccine with hepatitis B vaccine in adolescent girls aged 9-15 years.
Clinical trials registration: ClinicalTrials.gov registration number NCT00652938.
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