HPV16 Anitbody Levels Post Vaccination Clinical Trial
Official title:
Immunogenicity of Bivalent HPV Vaccine Among Partially Vaccinated Young Adolescent Girls in Uganda
Background:
- Cervical cancer is one of the leading causes of cancer death in women worldwide and in
Uganda. It is caused by the human papillomavirus (HPV). A vaccine against HPV was offered for
all 10-year-old girls in the Nakasongola district of Uganda from October 1, 2008, to October
31, 2009. The HPV vaccine requires three doses; however, some girls received only one or two
doses. Researchers want to compare vaccine immunogenicity in girls who received all three
doses with those who had only one or two doses.
Objectives:
- To examine the immunogenicity (antibody levels) of girls in Uganda who received only one,
two or three doses of HPV vaccine.
Eligibility:
- Girls who will be at least 12 years old by October 31, 2011, and had at least one dose
of the HPV vaccine.
- All participants will come from the Nakasongola district of Uganda.
Design:
- Participants will have a physical exam and answer questions about their medical history
and HPV risk.
- Participants will provide a single blood sample for testing.
- Treatment and vaccines will not be provided as part of this study. Girls who did not
receive all three doses of the HPV vaccine will be given information about the nearest
health center. Health centers will provide the missed doses free of charge.
Background:
Recent experience with HPV vaccine implementation in low resource settings has suggested that
high vaccine coverage for all three doses could be achieved provided programs are planned
well and have full and complementary components in place. However, some locations experienced
substantial rates of partially vaccinated girls, those who received only one or two doses.
From the vaccine trial data published thus far, we know that the vaccines produce high levels
of type-specific anti-HPV antibodies which begin to stabilize past 24 months
post-vaccination. Without an immune correlate of protection, it is difficult to know whether
girls who received one or two vaccine doses will still experience the same benefit of
protection from HPV infection as those who received all three doses of vaccine.
Recent data from a trial of a two-dose regimen of vaccination of girls aged 9-13 years in
Vancouver, Canada have suggested that the immune response of girls who received only two
doses was non-inferior both to that of girls who received 3 doses and to that of adult women
aged 16-25 years who also received 3 doses. In a complementary study in Guanacaste, Costa
Rica, vaccine efficacy (defined as 12-month vaccine type-specific infection persistence)
among adult women who received either one or two doses of HPV vaccine as a part of the Phase
IIb clinical trials of Cervarix (GSK) was similar to women who received all three vaccines
doses.
This proposed study would provide additional insight into the immunogenicity of HPV vaccine
among partially vaccinated girls in Uganda, which could add supportive evidence in an African
adolescent population (currently not represented in any clinical studies of HPV vaccines) of
the immunological implications of receiving less than 3 doses of HPV vaccine.
Objective:
To investigate whether the anti-HPV 16 and/or anti-HPV-18 immune responses elicited by the
bivalent vaccine for girls who received one dose and those who received two doses are similar
at greater than or equal to 24 months (after last dose) to girls who received all three doses
of bivalent HPV vaccine.
Eligibility:
Girls who received at least one dose of the HPV vaccine, 12-20 years of old, in apparent good
general health.
Design:
This is a cross-sectional immunogenicity study with three groups:
Group 1 - 200 girls who received only one dose of HPV vaccine as a part of the PATH-UNEPI HPV
vaccine demonstration project;
Group 2 - 200 girls who received only two doses of HPV vaccine as a part of the PATH-UNEPI
HPV vaccine demonstration project; and
Group 3 - 200 girls who received all three doses of HPV vaccine as a part of the PATH-UNEPI
HPV vaccine demonstration project.
This study will enroll girls (by group) within one district of Uganda from an HPV vaccine
registry maintained by the district.
Antibody level will be parameterized as the geometric mean titre of serum antibody to HPV
types 16 and/or 18 at greater than or equal to 24 months after last dose of vaccine. Titres
will be measured using the polyclonal Direct VLP ELISA.
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