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Moderna shares plunge after leak of partial cancer vaccine data

CNBC Thursday 22 October 2026, 18:30 UTC 1 min read
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Timon Schneider | SOPA Images | Lightrocket | Getty Images Moderna shares dropped as much as 25% on Thursday following the leak of partial data on its closely watched cancer vaccine developed with Merck. The stock fell even though the full data, released later Thursday, appeared positive based on Wall Street expectations ahead of the release. The personalized vaccine, known as intismeran autogene, paired with Merck's immunotherapy Keytruda reduced the risk of recurrence or death in certain...

Timon Schneider | SOPA Images | Lightrocket | Getty Images Moderna shares dropped as much as 25% on Thursday following the leak of partial data on its closely watched cancer vaccine developed with Merck. The stock fell even though the full data, released later Thursday, appeared positive based on Wall Street expectations ahead of the release. The personalized vaccine, known as intismeran autogene, paired with Merck's immunotherapy Keytruda reduced the risk of recurrence or death in certain melanoma patients by 42% compared to Keytruda alone. The late-stage trial results were set to be presented at the European Society for Medical Oncology conference this weekend. This story is developing. Please check back for updates.
Moderna (ORG) Timon Schneider (ORG) SOPA Images (ORG) Getty Images Moderna (ORG) Merck (ORG) intismeran autogene (ORG) Keytruda (ORG) the European Society for Medical Oncology (ORG)
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