OnCo
ideasIdea

A frameshift neoantigen vaccine for Lynch syndrome carriers as the first preventive cancer vaccine approval

People with Lynch syndrome have a very high lifetime cancer risk from a predictable set of mutations. Vaccinate them against those shared mutations before cancer appears.

Mismatch repair deficiency produces recurrent frameshift neoantigens shared across Lynch-associated tumours, and pilot vaccines have shown immunogenicity in carriers and in mice reduced tumour incidence. The proposal is to take a multi-epitope frameshift vaccine (mRNA or viral vector, possibly with a checkpoint-sparing adjuvant) into a randomised prevention trial in carriers with a surrogate endpoint of adenoma and early-cancer incidence at colonoscopy, positioning it as the first preventive cancer vaccine registration for a hereditary syndrome.

Hypothesis
Vaccination reduces incident advanced adenomas and cancers in Lynch carriers by at least 40% over five years compared with surveillance alone.
Rationale
Predictable shared antigens, a defined high-risk population with regular endoscopic surveillance providing a fast surrogate, and mature vaccine platforms make this the most tractable preventive vaccine in oncology.
What would test it
Phase 2b/3 randomised placebo-controlled trial in about 1,500 carriers with colonoscopy-based endpoints; interim immunological and adenoma readouts at two years.
Maturity
early clinical
Who has to act
research
Cost to try
Large (over $50M)
Years to first evidence
8
Bottlenecks it attacks

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