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Novel Cancer Vaccine Prevents Melanoma From Returning in First for mRNA

The interim Phase III results showed the combination met its goals, and Moderna shares rose 40% in premarket trading, the companies said.

  • On Wednesday, Merck and Moderna reported their personalized mRNA vaccine, Intismeran, combined with Keytruda reduced melanoma recurrence compared with Keytruda alone, marking the first positive late-stage trial results for an mRNA cancer vaccine.
  • The ongoing Phase III trial randomized 1,137 patients with high-risk stage IIB through IV melanoma to receive Keytruda plus up to nine vaccine doses or Keytruda alone, building on earlier mid-stage findings.
  • Moderna tailors each vaccine to the individual patient by analyzing mutations within their tumor, a highly targeted design requiring up to nine doses to administer the Intismeran treatment effectively.
  • Following the announcement, Moderna shares jumped 40% and Merck rose 2%, with the companies reporting no new safety concerns and that the treatment met primary and secondary trial endpoints.
  • January data showed the combination reduced melanoma recurrence or death risk by 49% after five years; the companies plan to present new data at an upcoming medical conference and share results with regulators.
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44 Articles

Center

An experimental melanoma vaccine, developed by Merck and Moderna, showed positive results in its first advanced clinical study. This was announced by the two companies in a note reported by CNBC. (ANSA)

·Rome, Italy
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Lean Left

The results, foreplay, make us hope for a mRna solution. The pharmaceutical company earns 96% in premarket on Wall Street

·Turin, Italy
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Reuters broke the news in London, United Kingdom on Wednesday, August 19, 2026.
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