2,949
Views
17
CrossRef citations to date
0
Altmetric
Product Review - Solicited

Expanded strain coverage for a highly successful public health tool: Prophylactic 9-valent human papillomavirus vaccine

, , ORCID Icon &
Pages 2280-2291 | Received 09 May 2017, Accepted 21 Jun 2017, Published online: 18 Oct 2017
 

ABSTRACT

Human papillomavirus is considered the causative factor for cervical cancer, which accounts for approximately 5% of the global cancer burden and more than 600,000 new cases annually that are attributable to HPV infection worldwide. The first-generation prophylactic HPV vaccines, Gardasil® and Cervarix®, were licensed approximately a decade ago. Both vaccines contain the most prevalent high-risk types, HPV16 and 18, which are associated with 70% of cervical cancer. To further increase the type coverage, 5 additional oncogenic HPV types (31, 33, 45, 52 and 58) were added to the existing Gardasil-4 to develop a 9-valent HPV vaccine (9vHPV), Gardasil 9®, increasing the potential level of protection from ∼70% to ∼90%. The efficacy of the vaccine lies primarily in its ability to elicit type-specific and neutralizing antibodies to fend off the viral infection. Therefore, type-specific and neutralizing murine monoclonal antibodies (mAbs) were used to quantitate the antigenicity of the individual vaccine antigens and to measure the antibody levels in the serum samples from vaccinees in a type- and epitope-specific manner in a competitive immunoassay. Assays for 9vHPV are extended from the proven platform used for 4vHPV by developing and adding new mAbs against the additional types. In Phase III clinical trials, comparable safety profile and immunogenicity against the original 4 types were demonstrated for the 9vHPV vaccine, and these were comparable to the 4vHPV vaccine. The efficacy of the 9vHPV vaccine was established in trials with young women. Immunobridging for younger boys and girls was performed, and the results showed higher immunogenicity in the younger age group. In a subsequent clinical trial, the 2-dose regimen of the 9vHPV vaccine used among girls and boys aged 9–14 y showed non-inferior immunogenicity to the regular 3-dose regimen for young women (aged 16–26 years). Overall, the clinical data and cost-effectiveness analysis for the 9vHPV vaccine support its widespread use to maximize the impact of this important, life-saving vaccine.

Abbreviations

ACIP=

advisory committee on immunization practices

AEs=

adverse events

CIN=

cervical intraepithelial neoplasia

cLIA=

competitive Luminex immunoassay

FDA=

food and drug administration

GMTs=

geometric mean titers

HPVs=

human papillomaviruses

IVRP=

in vitro relative potency

mAbs=

monoclonal antibodies

NCT=

national clinical trial

PE=

phycoerythrin

QALY=

quality adjusted life years

SAEs=

serious adverse events

VIN=

vulvar intraepithelial neoplasia

VLPs=

virus like-particles

WHO=

world health organization

Disclosure of potential conflicts of interest

No potential conflicts of interest were disclosed.

Acknowledgment

We thank Mr. Xin Wang of Xiamen University for critical reading of the manuscript.

Funding

The writing was enabled with the supports from the National Natural Science Foundation of China (No.31670939 and No.81471934), Science and Technology Major Project of Fujian province (No.2015YZ0002) and the Scientific Research Foundation of State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics (Grant No. 2016ZY005).

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.