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Moderna, Merck mRNA Cancer Vaccine Prevents Melanoma From Returning in Trial

The personalized vaccine and Keytruda cut the risk of melanoma returning or death by 49%, Merck and Moderna said.

  • Moderna and Merck reported their personalised mRNA vaccine helped prevent melanoma from returning or spreading in a large trial involving more than 1,000 patients, combining the vaccine with Merck's Keytruda immunotherapy.
  • Trial data showed adding the vaccine to Keytruda reduced the risk of cancer returning or death by 49 per cent, using synthetic mRNA coding for up to 34 neoantigens to target each patient's unique tumour mutations.
  • The combination also reduced the risk of cancer spreading to distant parts of the body or death by 59 per cent, which Julie Gralow, Chief Medical Officer of the American Society of Clinical Oncology, called a "monumental leap forward."
  • Ryan Sullivan, director of the Centre for Melanoma at Mass General Brigham Cancer Institute, described the findings as "a big deal for the field in general," as trials expand to include lung, bladder, and kidney cancers.
  • The American Cancer Society estimates roughly 112,000 new cases of invasive melanoma in 2026, while Robert Vonderheide, president-elect of the American Association for Cancer Research, said, "We should be hearing results from multiple studies over the next few years, and there's every reason to hope now.
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Never has ESMO, the Congress of the European Society of Medical Oncology, been so eagerly awaited this year.The meeting will take place in Madrid from 23 to 27 October, and it is expected that the Moderna and MSD pharmaceutical companies (Merck in the United States) will show concrete data from one of the most anticipated investigations: the trial of the first melanoma RNA vaccine.Last week the two companies launched an appetizer of their progre…

·Madrid, Spain
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Center

“A melanoma vaccine successfully surpasses a phase III clinical trial.” Thus stated, the advance made public by Merck and Moderna companies

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Slashdot broke the news in San Diego, United States on Saturday, August 22, 2026.
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