title: Safety and persistent immunogenicity of a quadrivalent human papillomavirus types 6, 11, 16, 18 L1 virus-like particle vaccine in preadolescents and adolescents: a randomized controlled trial.
abstract: OBJECTIVE
  Administration of a quadrivalent HPV-6/ 1/16/18 vaccine to 16- to 26-year-old women was highly effective in preventing HPV-6/ 1/16/18-related cervical/vulvar/vaginal precancerous lesions and genital warts. As the risk of acquiring HPV significantly rises after sexual debut, HPV vaccines should have the greatest benefit in sexually naive adolescents. We evaluated the tolerability and immunogenicity of quadrivalent vaccine in males and females 9 to 15 years of age through 18 months postenrollment.
  
  
  METHODS
  In this randomized, double-blind trial, 1781 sexually naive children were assigned (2:1) to quadrivalent HPV-6/11/16/18 vaccine or saline placebo administered at day 1 and months 2 and 6. Serum neutralizing anti-HPV-6/11/16/18 responses were summarized as geometric mean titers (GMTs) and seroconversion rates. Primary analyses were done per-protocol (subjects received 3 doses, had no major protocol violations and were HPV type-specific seronegative at day 1). Adverse experiences were collected by diary card.
  
  
  RESULTS
  At month 7, seroconversion rates were > or =99.5% for the 4 vaccine-HPV-types. GMTs and seroconversion rates in boys were noninferior to those in girls (P < 0.001). At month 18, > or =91.5% of vaccine recipients were seropositive, regardless of gender. A higher proportion of vaccine recipients (75.3%) than placebo recipients (50.0%) reported one or more injection-site adverse experiences following any vaccination. Rates of fever were similar between vaccination groups. No serious vaccine-related adverse experiences were reported.
  
  
  CONCLUSIONS
  In 9- to 15-year-old adolescents, the quadrivalent vaccine was generally well tolerated and induced persistent anti-HPV serologic responses in the majority of subjects for at least 12 months following completion of a three-dose regimen. The vaccine durability supports universal HPV vaccination programs in adolescents to reduce the burden of clinical HPV disease, particularly cervical cancer and precancers.
authors.affiliation: Primary Physicians Research, Pittsburgh, PA, USA. ksrppr@aol.com
authors.forename: Keith S
authors.initials: KS
authors.lastname: Reisinger
authors.forename: Stan L
authors.initials: SL
authors.lastname: Block
authors.forename: Eduardo
authors.initials: E
authors.lastname: Lazcano-Ponce
authors.forename: Rudiwilai
authors.initials: R
authors.lastname: Samakoses
authors.forename: Mark T
authors.initials: MT
authors.lastname: Esser
authors.forename: Joanne
authors.initials: J
authors.lastname: Erick
authors.forename: Derek
authors.initials: D
authors.lastname: Puchalski
authors.forename: Katherine E D
authors.initials: KE
authors.lastname: Giacoletti
authors.forename: Heather L
authors.initials: HL
authors.lastname: Sings
authors.forename: Suzanne
authors.initials: S
authors.lastname: Lukac
authors.forename: Frances B
authors.initials: FB
authors.lastname: Alvarez
authors.forename: Eliav
authors.initials: E
authors.lastname: Barr
mesh_terms: D000293:Adolescent; D000914:Antibodies, Viral / Q000097:blood*; D002648:Child; D003218:Condylomata Acuminata / Q000517:prevention & control*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D010212:Papilloma / Q000517:prevention & control*; D030361:Papillomavirus Infections / Q000517:prevention & control*; D053918:Papillomavirus Vaccines / Q000009:adverse effects* / Q000276:immunology*; D013997:Time Factors
chemical_list: D000914:Antibodies, Viral; D053918:Papillomavirus Vaccines