A personalized mRNA-based cancer vaccine has shown promise in extending life span. Merck and Moderna announced the vaccine's success in a large, late-stage trial. The trial involved high-risk patients with melanoma.

The vaccine is based on mRNA technology and is personalized, suggesting it is tailored to individual patients. Merck and Moderna made the announcement on Wednesday, revealing the vaccine's success in the trial. Further details about the trial and the vaccine's effects are available from the source.

The announcement marks a potentially significant development in the treatment of melanoma, particularly for high-risk patients.