Methods
277 young women (mean age 20·2 years [SD 1·7]) were randomly assigned to quadrivalent HPV (20 É g type 6, 40 É g type 11, 40 É g type 16, and 20 É g type 18) L1 virus-like-particle (VLP) vaccine and 275 (mean age 20·0 years [1·7]) to one of two placebo preparations at day 1, month 2, and month 6. For 36 months, participants underwent regular gynaecological examinations, cervicovaginal sampling for HPV DNA, testing for serum antibodies to HPV, and Pap testing. The primary endpoint was the combined incidence of infection with HPV 6, 11, 16, or 18, or cervical or external genital disease (ie, persistent HPV infection, HPV detection at the last recorded visit, cervical intraepithelial neoplasia, cervical cancer, or external genital lesions caused by the HPV types in the vaccine). Main analyses were done per protocol.
Findings
Combined incidence of persistent infection or disease with HPV 6, 11, 16, or
18 fell by 90% (95% CI 71-97, p<0·0001) in those assigned vaccine compared with those assigned placebo.
Interpretation
A vaccine targeting HPV types 6, 11, 16, 18 could substantially reduce the
acquisition of infection and clinical disease caused by common HPV types.
AUTHOR DISCUSSION
We have shown that a multivalent vaccine is efficacious against HPV types
that cause cancer and genital warts. Over 35 months’ follow-up, incidence of
persistent infection associated with HPV 6, 11, 16, or 18 decreased by 89% in women allocated active vaccine who had at least one dose (ie, the modified intention-to-treat population) compared with those allocated placebo. Vaccine efficacy was 90% in the per-protocol efficacy population, suggesting that the vaccine was protective even during the vaccination period. For example, during the course of vaccination (day 1 through month 7), three women assigned active vaccine and five women assigned placebo were detected with HPV 18 DNA. Of these, only one was verifiable persistent infection (in the placebo group). Thus, one woman allocated placebo and no women allocated active vaccine developed persistent HPV 18 infection during the vaccination period. Furthermore, efficacy with regard to clinical disease associated with HPV 6, 11, 16, or 18 was 100%.
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