Could a delayed booster still protect against HPV?
NCT ID NCT02568566
First seen Jun 25, 2026 · Last updated Jul 10, 2026 · Updated 2 times
Summary
This study is testing whether giving the HPV vaccine (Gardasil 9) on a different schedule still works well in healthy 9-11 year olds. The standard schedule uses two or three doses, but this study gives a first dose and then a booster later. Researchers will measure antibody levels over two years to see if protection lasts. The goal is to find a simpler schedule that might be easier for families to complete.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- HPV vaccine (Gardasil 9)
- What this could lead to
- If successful, this could support a simpler, delayed-booster schedule for the HPV vaccine, making it easier to complete.
- What could go wrong
- This is a small, early-phase study (Phase 2) with no control group. The alternative schedule may not provide the same long-term protection as the standard one.
This is an AI summary of the original study and may miss details. Read our disclaimer.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Banner University Medical Center - Tucson
Tucson, Arizona, 85719, United States
-
UCLA / Jonsson Comprehensive Cancer Center
Los Angeles, California, 90095, United States
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