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Novel Cancer Vaccine Prevents Melanoma From Returning in First for mRNA

The result is the first positive late-stage trial for an mRNA cancer vaccine and sent Moderna shares up more than 120%, the companies said.

  • On Wednesday, Moderna and Merck announced their personalized mRNA vaccine intismeran combined with Keytruda met primary and secondary endpoints in a Phase 3 trial of 1,137 high-risk melanoma patients.
  • Designed to target unique mutations in each patient's tumor, intismeran trains the immune system to identify and destroy remaining cancer cells as an adjuvant therapy administered after surgery.
  • Shares of Moderna surged 93% on Wednesday after the vaccine-plus-Keytruda combination demonstrated superior efficacy in preventing melanoma recurrence and spread compared with Keytruda alone in the late-stage study.
  • Merck and Moderna plan to present detailed trial results at an upcoming medical meeting and share findings with regulators, having already secured an expedited review pathway from the FDA and European Medicines Agency.
  • Manufacturing each personalized dose takes six weeks, while companies explore this mRNA approach across nine additional Phase 2 and Phase 3 trials spanning melanoma, lung, bladder, kidney, pancreatic and gastric cancers.
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The actions of the pharmaceutical companies Moderna and Merck lived a historic day on the stock market. Especially the first one that saw their actions steeped 176.97% at the close until the $174.38. The reason? Both companies announced the positive preliminary results of clinical trials of an experimental melanoma vaccine. Merck, for his part, ... Continue reading "Moderna and Merck shoot in the stock market after a successful trial of an exper…

·Concepción, Chile
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A personalized vaccine against melanoma showed positive results in the final phase of clinical trials, Merck and Moderna announced

·Paço de Arcos, Portugal
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Reuters broke the news in London, United Kingdom on Wednesday, August 19, 2026.
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