Long-term effectiveness of HPV vaccination against HPV infection in young Japanese women: Real-world data.

Megumi Kurosawa, Masayuki Sekine* (Corresponding Author), Manako Yamaguchi, Risa Kudo, Sharon J. B. Hanley, Megumi Hara, Sosuke Adachi, Yutaka Ueda, Etsuko Miyagi, Sayaka Ikeda, Asami Yagi, Takayuki Enomoto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

In Japan, public funding for HPV vaccination began in 2010 for girls aged 13-16 years (birth cohort years 1994-1997) and women born in 1994 who turned 25 in 2019. We aimed to verify the long-term effectiveness of the bivalent HPV vaccine in women aged 25 years. Subjects were women aged 25-26 years who underwent cervical cancer screening and HPV testing in Niigata from 2019 to 2020 (birth cohort years 1993-1994). Information on vaccination status and sexual behavior was obtained from a questionnaire and municipal records. We compared the HPV infection rates of the vaccinated and unvaccinated groups. Of the 429 registrants, 150 (35.0%) and 279 (65.0%) were vaccinated and unvaccinated, respectively. The average period from HPV vaccination to HPV testing was 102.7 months (8.6 years), with a median of 103 months (range 92-109 months). The HPV high-risk infection rate was 21.3% (32/150) in the vaccinated group and 23.7% (66/279) in the unvaccinated group (P = 0.63). The HPV16/18 infection rate was 0% (0/150) in the vaccinated group and 5.4% (15/279) in the unvaccinated group, showing a significant difference (P = 0.0018), and the vaccine effectiveness was 100%. The cross-protective type HPV31/45/52 infection rate in the vaccinated group was significantly lower than that in the unvaccinated group (3.3% vs. 10.0%, P = 0.013). There was no significant difference in the mean age at sexual debut and the number of previous sexual partners between the two groups. We have demonstrated the long-term 9-year effectiveness of the bivalent vaccine against HPV infection for the first time in Japan.
Original languageEnglish
Pages (from-to)1435-1440
Number of pages6
JournalCancer Science
Volume113
Issue number4
Early online date14 Feb 2022
DOIs
Publication statusPublished - 1 Apr 2022

Bibliographical note

ACKNOWLEDGEMENTS
We would like to thank Ms. Yuka Watanabe, Ms. Sachiko Ono, Ms. Anna Ishida, and the administrator of Niigata city for their support in conducting the survey

Keywords

  • Adult
  • Female
  • Humans
  • Japan/epidemiology
  • cervical cancer
  • HPV infection
  • HPV vaccine
  • Early Detection of Cancer
  • Vaccination
  • Japan
  • *Papillomavirus Infections/diagnosis/epidemiology/prevention & control
  • *Papillomavirus Vaccines/therapeutic use
  • *Uterine Cervical Neoplasms/epidemiology/prevention & control
  • Human papillomavirus 16
  • Human papillomavirus 18
  • long-term effectiveness

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