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Personalized vaccine helped melanoma patients stay cancer-free longer, drugmakers say

The personalized mRNA shot cut melanoma recurrence risk in a 1,137-patient study, while Moderna shares more than doubled after the announcement.

  • Last Wednesday, Moderna and Merck revealed that a 1,137-volunteer study showed their vaccine reduced the risk that surgically removed melanoma would return or spread, combining Messenger RNA technology with Keytruda.
  • Unlike older vaccines that targeted proteins also found in healthy tissues, scientists designed this vaccine to train the immune system to recognize specific mutations in a patient's cancer.
  • Paz-Ares, head of the Medical Oncology Department at the Octubre University Hospital in Madrid, noted the trial focused on high-risk stage 2 to 4 melanomas; an earlier, smaller trial showed the combined treatment reduced relapse or death risk by 49%.
  • Moderna shares have more than doubled in value following the announcement, representing tens of billions in market capitalization, while MSD has seen its share price rise by about 10%.
  • Because cancer is many diseases, scientists must assign a different strategy to each one rather than expecting a single cure for all; widespread application also remains difficult, as these treatments can cost more than $115,000.
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A personalized mRNA vaccine after surgery helps the immune system recognize cancer cells and reduces the risk of melanoma recurrence.

·Ljubljana, Slovenia
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The first therapeutic vaccine that could actually help treat cancer. Moderna and Merck last week presented results from late-stage clinical trials that reveal a major milestone – the intismeran vaccine, given together with the drug Keytruda, showed the ability to prevent relapse and...

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Medical Xpress broke the news in Douglas, United Kingdom on Monday, August 24, 2026.
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