Impact of human papillomavirus vaccination on rates of abnormal cervical cytology and histology in young New Zealand women

N Z Med J. 2020 Jan 17;133(1508):72-84.

Abstract

Aim: Determine the impact of quadrivalent human papillomavirus (HPV) vaccination on abnormal cervical cytology and histology rates in young New Zealand women.

Methods: Retrospective population-based cohort study of women born 1990-1994, with a cervical cytology or histology recorded when aged 20-24 between 1 January 2010 and 31 December 2015. Data was obtained through linking the National Immunisation Register and National Cervical Screening Programme Register.

Results: N=104,313 women (376,402 person years of follow up) were included. The incidence of high-grade cytology was lower in vaccinated women (at least one dose prior to 18 years) than in unvaccinated women (8.5 vs 11.3 per 1,000 person years [p1000py], incidence rate ratio [IRR 0.75], 95% CI 0.70, 0.80, p<.001). The incidence of high-grade histology was lower in vaccinated women than in unvaccinated women (6.0 vs 8.7 p1000py, IRR 0.69, 95% CI 0.64, 0.75, p<.001). There was no evidence of a difference in the incidence of high-grade histology between European and Māori women overall or after taking vaccination status into account.

Conclusions: Receiving at least one dose of quadrivalent HPV vaccine prior to 18 years was associated with a 25% lower incidence of high-grade cytology and 31% lower incidence of high-grade histology in women aged 20-24 years.

Publication types

  • Comparative Study

MeSH terms

  • Cervical Intraepithelial Neoplasia / diagnosis
  • Cervical Intraepithelial Neoplasia / epidemiology
  • Cervical Intraepithelial Neoplasia / prevention & control*
  • Cervical Intraepithelial Neoplasia / virology
  • Female
  • Humans
  • Incidence
  • Mass Screening / methods
  • New Zealand / epidemiology
  • Papillomavirus Infections / diagnosis
  • Papillomavirus Infections / epidemiology
  • Papillomavirus Infections / prevention & control*
  • Papillomavirus Infections / virology
  • Papillomavirus Vaccines / administration & dosage
  • Papillomavirus Vaccines / immunology*
  • Retrospective Studies
  • Uterine Cervical Neoplasms / diagnosis
  • Uterine Cervical Neoplasms / epidemiology
  • Uterine Cervical Neoplasms / prevention & control*
  • Uterine Cervical Neoplasms / virology
  • Vaginal Smears / methods
  • Young Adult

Substances

  • Papillomavirus Vaccines