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Moderna's sign is seen outside of their headquarters in Cambridge, MA on March 11, 2021.

An experimental mRNA vaccine developed by Moderna combined with Merck's blockbuster immunotherapy Keytruda cut the risk of death or recurrence of the most deadly skin cancer by 44% compared Keytruda alone, U.S. researchers reported at a medical meeting on Sunday.

The findings suggest that adding a personalized cancer vaccine based on mRNA technology to Keytruda, which revs up the immune response, could prolong the time patients have without recurrence or death, said Dr. Jeffrey Weber of the NYU Langone Perlmutter Cancer Center, who presented the findings.

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