On August 19–20, 2026, pharmaceutical giants Merck and Moderna announced that an experimental mRNA vaccine treatment demonstrated promise in preventing melanoma recurrence in high-risk patients, sending stock prices soaring. The companies reported positive signals but had not yet published detailed trial data.
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Pharmaceutical giants Moderna and Merck said that an experimental vaccine treatment has shown signs of preventing skin cancer from returning or spreading in a study of melanoma patients.
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BREAKING: Merck and Moderna say an mRNA vaccine shows promise in preventing the recurrence of melanoma, sending stocks soaring.
Pharmaceutical giants Moderna and Merck said that an experimental vaccine treatment has shown signs of preventing cancer from returning or spreading in a study of high-risk melanoma patients. NBC News health reporter Aria Bendix explains what happens next.