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Moderna stock soars 177%, Merck jumps 12% after cancer vaccine shows promise in late-stage trial

Summary by Ground News
An experimental personalized cancer vaccine from Merck and Moderna showed positive initial results in its first-ever late-stage trial, the companies announced on Wednesday, bringing them one step closer to filing for approval of the treatment option.

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Moderna, in collaboration with Merck, achieved success in Phase 3 clinical trials for a personalized mRNA cancer vaccine. Significant results were obtained in high-risk melanoma patients, demonstrating a reduction in the risk of recurrence and metastasis, leading to a surge in the stock price amidst high market valuations. While the challenge of optimizing the production process remains, the initiative has demonstrated the potential for a succes…

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