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High materiality7/10

Moderna slides after alleged ESMO abstract leak questions intismeran efficacy

Oct 22, 2026, 3:59 PM EDT1 sourcesAI-analyzed

Why it may matterVerify against the original reporting

Alleged data leak and unverified Phase 3 results created material near-term headwinds; the market downgraded on efficacy doubts vs Phase 2b and competing immunotherapies.

AI summary

What happened, with direct paths to the underlying reporting

An alleged leak of an ESMO 2026 abstract suggests intismeran autogene plus Keytruda yielded a 42% reduction in recurrence or death (HR 0.58) in Phase 3, but results are unverified. This compares with a 49% reduction in Phase 2b, prompting questions whether the vaccine adds value beyond existing immunotherapy.

Alleged ESMO 2026 abstract leak questions intismeran efficacy.
Phase 3 hazard ratio cited at 0.58; 42% risk reduction claimed.
Data unverified; independent confirmation pending.
Phase 2b five-year follow-up showed 49% recurrence reduction; 60.3 months median.
MRNA shares fell about 25% intraday amid cautious sentiment.

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