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A Review of Clinical Trials of Human Papillomavirus Prophylactic Vaccines
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A Review of Clinical Trials of Human Papillomavirus Prophylactic Vaccines
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Journal Article
A Review of Clinical Trials of Human Papillomavirus Prophylactic Vaccines
2012
Overview
► The analyses of human papilloma virus/virus-like particle vaccine phase III efficacy trials in young women are largely completed. ► High efficacy was observed for incident infection and disease by vaccine types. ► Other clinical trials demonstrated protection against genital warts and anal dysplasia in men. ► Immunobridging studies have extended vaccine recommendations to adolescents.
End of study analyses of the phase III trials of prophylactic human papillomavirus (HPV) virus-like particle (VLP) vaccines in young women are now largely completed. Two distinct vaccines were evaluated, Gardasil® (Merck & Co., Whitehouse Station, NJ USA) a quadrivalent vaccine containing VLPs of types 6, 11, 16 and 18 and Cervarix® (GlaxoSmithKline Biologicals, Rixensart, Belgium), a bivalent vaccine containing VLPs of types 16 and 18. Both vaccines exhibited excellent safety and immunogenicity profiles. The vaccines also demonstrated remarkably high and similar efficacy against the vaccine-targeted types for a range of cervical endpoints from persistent infection to cervical intraepithelial neoplasia grade 3 (CIN3) in women naïve to the corresponding type at the time of vaccination. However, protection from incident infection or disease from non-vaccine types was restricted, and the vaccines had no effect on prevalent infection or disease. Gardasil® also demonstrated strong protection against genital warts and vulvar/vaginal neoplasia associated with the vaccine types. In other trials, Gardasil® protected mid-adult women from incident infection and CIN caused by the vaccine types and protected men for incident infection, genital warts and anal intraepithelial neoplasia by the vaccine types. Cervarix® protected against vaccine-targeted anal infections in women in an end of study evaluation. For practical reasons, efficacy studies have not been conducted in the primary target populations of current vaccination programs, adolescent girls and boys. However, immunogenicity bridging studies demonstrating excellent safety and strong immune responses in adolescence, coupled with the documentation of durable antibody responses and protection in young adults, leads to an optimistic projection of the effectiveness of the vaccines in adolescent vaccination programs. Taken together, the excellent clinical trial results strongly support the potential of the vaccines as high value public health interventions and justify their widespread implementation to prevent anogenital HPV infections and their associated neoplasia.
This article forms part of a special supplement entitled “Comprehensive Control of HPV Infections and Related Diseases” Vaccine Volume 30, Supplement 5, 2012.
Publisher
Elsevier Ltd
Subject
/ Anus Neoplasms - prevention & control
/ Belgium
/ boys
/ Cervarix
/ CIN
/ Clinical Trials, Phase III as Topic
/ Condylomata Acuminata - prevention & control
/ Condylomata Acuminata - virology
/ Female
/ Gardasil
/ girls
/ HPV
/ Human Papillomavirus Recombinant Vaccine Quadrivalent, Types 6, 11, 16, 18
/ Humans
/ Male
/ men
/ Papillomavirus Infections - complications
/ Papillomavirus Infections - prevention & control
/ Papillomavirus Vaccines - administration & dosage
/ Papillomavirus Vaccines - adverse effects
/ Papillomavirus Vaccines - immunology
/ Uterine Cervical Neoplasms - prevention & control
/ Uterine Cervical Neoplasms - virology
/ vaccines
/ Vaccines, Virus-Like Particle - administration & dosage
/ Vaccines, Virus-Like Particle - adverse effects
/ Vaccines, Virus-Like Particle - immunology
/ Vaginal Neoplasms - prevention & control
/ Vaginal Neoplasms - virology
/ VaIN
/ VIN
/ Vulvar Neoplasms - prevention & control
/ warts
/ women
