On August 19, 2026, Moderna, Inc. (NASDAQ:MRNA) and Merck & Co., Inc. (NYSE:MRK) said their personalized melanoma vaccine, intismeran, combined with Merck's Keytruda, met its goals in a Phase 3 trial of 1,137 patients. It reduced the risk of cancer recurrence and spread compared with Keytruda alone, Reuters reported.
It is the first positive late-stage trial result for an mRNA cancer vaccine. Merck's Jane Healy called the result a "clinically meaningful improvement," and said it was well tolerated, CNBC reported.
Both companies' shares rose on the news. Full data will be presented at an upcoming medical meeting alongside regulatory filing discussions. The companies are already running additional trials of the same vaccine-Keytruda combination in lung, bladder, kidney, pancreatic, and stomach cancers.
For Moderna, Inc. (NASDAQ:MRNA), this is proof that its mRNA platform works beyond vaccines for infectious disease. A positive Phase 3 readout validates years of personalized cancer vaccine development. It gives Moderna a genuine second growth pillar alongside its COVID business, one built on technology the company already knows how to manufacture and scale.
For Merck & Co., Inc. (NYSE:MRK), the result extends Keytruda's competitive life at a critical moment. Pairing Keytruda with a personalized vaccine gives Merck a differentiated, harder-to-copy combination therapy just as Keytruda itself approaches patent expiration later this decade. Hence, it protects franchise revenue through a next-generation product rather than the drug alone.
#result #NYSE
It is the first positive late-stage trial result for an mRNA cancer vaccine. Merck's Jane Healy called the result a "clinically meaningful improvement," and said it was well tolerated, CNBC reported.
Both companies' shares rose on the news. Full data will be presented at an upcoming medical meeting alongside regulatory filing discussions. The companies are already running additional trials of the same vaccine-Keytruda combination in lung, bladder, kidney, pancreatic, and stomach cancers.
For Moderna, Inc. (NASDAQ:MRNA), this is proof that its mRNA platform works beyond vaccines for infectious disease. A positive Phase 3 readout validates years of personalized cancer vaccine development. It gives Moderna a genuine second growth pillar alongside its COVID business, one built on technology the company already knows how to manufacture and scale.
For Merck & Co., Inc. (NYSE:MRK), the result extends Keytruda's competitive life at a critical moment. Pairing Keytruda with a personalized vaccine gives Merck a differentiated, harder-to-copy combination therapy just as Keytruda itself approaches patent expiration later this decade. Hence, it protects franchise revenue through a next-generation product rather than the drug alone.
#result #NYSE
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