evidence: In what many global health leaders are calling a milestone study, researchers in Sweden have confirmed that widespread use of the human papillomavirus (HPV) vaccine dramatically reduces the number of women who will develop cervical cancer. [...] The Swedish study is the largest to compare cervical cancer diagnoses among women who did and did not receive an HPV vaccine. In Sweden, the only HPV vaccine available during the time period studied was one that protects against four HPV types: HPV 6, HPV 11, HPV 16, and HPV 18. Infections with types 16 and 18 are responsible for approximately 70% of cervical cancers, and types 6 and 11 cause 90% of genital warts. [...] Overall, 19 of the vaccinated women were diagnosed with cervical cancer during the study period, compared with 538 of the unvaccinated women. After adjusting for different factors that can influence cervical cancer risk, those numbers translated into a 63% reduced risk of being diagnosed with cervical cancer among females who had been vaccinated compared with those who hadn’t.