Human papillomavirus vaccine

Abstract

Cervical cancer is the fourth most common cancer in women worldwide and is a significant public health problem. Currently, there are three bivalent human papillomavirus (HPV) vaccines targeting high-risk HPV types (16, 18), two quadrivalent vaccines targeting two high risk HPV types (16,18) and two low risk types (6,11) and one nonavalent vaccine against HPV 16,18, 31, 33, 45, 52, 58, 6 and 11. All are WHO approved vaccines and show excellent seropositivity (>95%) even at 5–10 years' post-vaccination irrespective of dosing schedule. These vaccines are relatively safe with minor local side effects. The WHO recommends two dosage vaccination schedule for girls aged 9–14 years with an off-label recommendation for a single-dose schedule. HPV vaccination has shown efficacy against the reduction of cervical intraepithelial neoplasia, invasive cervical cancer, anogenital warts and vulvovaginal intraepithelial neoplasia in numerous population/registry-based cohort studies worldwide. Countries such as Australia and Sweden where vaccination began as early as 2006–2008 have seen a major reduction in the incidence of cervical cancer in the vaccinated cohorts. Model based projection studies have also indicated significant vaccine efficacy with two doses and single dose in catch-up programmes. In this article, we provide an update on the vaccine recommendations, immunogenicity and efficacy data derived from registry-based cohort studies and trials published mostly in the last 5 years.