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Group — Quadrivalent Vaccine against Human Papillomavirus to Prevent High-Grade Cervical Lesions

New England Journal of Medicine, 2007 · 10.1056/NEJMoa061741

CANNOT CERTIFY · 2 flags

In plain language

The FUTURE II trial (NEJM 2007) tested the quadrivalent HPV vaccine Gardasil against a 'placebo' in roughly 12,000 women and reported about 98 percent per-protocol efficacy against vaccine-type high-grade cervical lesions. The critical problem is the control: the 'placebo' was the vaccine's own amorphous aluminium hydroxyphosphate sulfate (AAHS) adjuvant, not an inert saline injection, yet trial consent and recruitment materials described it to participants as 'saline or an inactive substance'. Because the comparator carries the very adjuvant that drives injection-site reactogenicity, the trial cannot support an absolute tolerability claim, and it specifically masks adjuvant-related harms. From the FDA label the vaccine adds about 35 points of injection-site pain versus true saline, but the AAHS control hid roughly 27 of those points. Efficacy against vaccine-type lesions is real, but the safety comparison is compromised and the intention-to-treat efficacy against all high-grade lesions was only about 17 percent, so the verdict is capped at cannot-certify.

Flags — what does not hold up

• high conclusion-unsupported — The 'placebo' was the vaccine's own AAHS aluminium adjuvant, described to participants as 'saline or an inactive substance'; a non-inert comparator cannot support an absolute tolerability conclusion and specifically masks adjuvant reactogenicity. FDA Gardasil prescribing information Table 1; Tomljenovic & McHenry 2024 (PMC11191454)
  integrity conflicted · impact high
• moderate overstatement — Headline foregrounds ~98% per-protocol efficacy against vaccine-type high-grade lesions while ITT efficacy against ALL high-grade lesions was ~17%. FUTURE II ITT vs per-protocol tables; FDA label
  integrity moderate · impact moderate

Method — the checks that were run

• quantify masked reactogenicity — FDA label: injection-site pain 83.9% (vaccine) vs 48.6% (AAHS 'placebo'); vs true saline the vaccine is ~+35.3 pts, of which the AAHS control masks ~27 pts.
• efficacy PP vs ITT — ~98% per-protocol against vaccine-type high-grade lesions; ~17% ITT against all high-grade lesions.

Next leads — where to look next

• 10.1056/NEJMoa1405044 Gardasil 9 pivotal trial used Gardasil 4 as its comparator, chaining its safety baseline back to this AAHS-controlled trial.
  Gardasil 9 pivotal trial used Gardasil 4 as its comparator, chaining its safety baseline back to this AAHS-controlled trial.

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