A randomized, observer-blinded immunogenicity trial of Cervarix(®) and Gardasil(®) Human Papillomavirus vaccines in 12-15 year old girls
Eve Draper, Sara L Bissett, Rebecca Howell-Jones, Pauline Waight, Kate Soldan, Mark Jit, Nicholas Andrews, Elizabeth Miller, Simon Beddows, Eve Draper, Sara L Bissett, Rebecca Howell-Jones, Pauline Waight, Kate Soldan, Mark Jit, Nicholas Andrews, Elizabeth Miller, Simon Beddows
Abstract
Background: The current generation of Human Papillomavirus (HPV) vaccines, Cervarix® and Gardasil®, exhibit a high degree of efficacy in clinical trials against the two high-risk (HR) genotypes represented in the vaccines (HPV16 and HPV18). High levels of neutralizing antibodies are elicited against the vaccine types, consistent with preclinical data showing that neutralizing antibodies can mediate type-specific protection in the absence of other immune effectors. The vaccines also confer protection against some closely related non-vaccine HR HPV types, although the vaccines appear to differ in their degree of cross-protection. The mechanism of vaccine-induced cross-protection is unknown. This study sought to compare the breadth and magnitudes of neutralizing antibodies against non-vaccine types elicited by both vaccines and establish whether such antibodies could be detected in the genital secretions of vaccinated individuals.
Methods and findings: Serum and genital samples were collected from 12-15 year old girls following vaccination with either Cervarix® (n = 96) or Gardasil® (n = 102) HPV vaccine. Serum-neutralizing antibody responses against non-vaccine HPV types were broader and of higher magnitude in the Cervarix®, compared to the Gardasil®, vaccinated individuals. Levels of neutralizing and binding antibodies in genital secretions were closely associated with those found in the serum (r = 0.869), with Cervarix® having a median 2.5 (inter-quartile range, 1.7-3.5) fold higher geometric mean HPV-specific IgG ratio in serum and genital samples than Gardasil® (p = 0.0047). There was a strong positive association between cross-neutralizing antibody seropositivity and available HPV vaccine trial efficacy data against non-vaccine types.
Conclusions: These data demonstrate for the first time that cross-neutralizing antibodies can be detected at the genital site of infection and support the possibility that cross-neutralizing antibodies play a role in the cross-protection against HPV infection and disease that has been reported for the current HPV vaccines.
Trial registration: ClinicalTrials.gov NCT00956553.
Conflict of interest statement
Competing Interests: The authors have declared that no competing interests exist.
Figures
![Figure 1. CONSORT diagram.](https://www.ncbi.nlm.nih.gov/pmc/articles/instance/3641072/bin/pone.0061825.g001.jpg)
![Figure 2. Neutralizing antibody responses over time…](https://www.ncbi.nlm.nih.gov/pmc/articles/instance/3641072/bin/pone.0061825.g002.jpg)
![Figure 3. Breadth of neutralizing antibody responses…](https://www.ncbi.nlm.nih.gov/pmc/articles/instance/3641072/bin/pone.0061825.g003.jpg)
![Figure 4. Relationship between HPV-specific vaccine antibodies…](https://www.ncbi.nlm.nih.gov/pmc/articles/instance/3641072/bin/pone.0061825.g004.jpg)
![Figure 5. Type-specific neutralizing antibody seroprevalence in…](https://www.ncbi.nlm.nih.gov/pmc/articles/instance/3641072/bin/pone.0061825.g005.jpg)
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