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Experimental cancer vaccine from Merck and Moderna shows promising results in late-stage melanoma trial

Market News
19 Aug 2026
CNBC
View Source
Bullish
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Merck and Moderna announced positive initial results from their first late-stage trial of an experimental personalized cancer vaccine combined with Merck's immunotherapy Keytruda. The phase three trial involving over 1,100 melanoma patients showed the combo significantly extended the time patients lived without cancer returning and reduced the risk of cancer spreading compared to Keytruda alone. The vaccine targets unique tumor mutations in each patient, offering a personalized approach. The companies plan to present the data at an upcoming medical meeting, with further study on overall survival ongoing, potentially leading to a new treatment option for melanoma and other cancers.

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