Using mRNA is a promising new way to make [vaccines to help treat cancer](https://www.cancer.org/cancer/managing-cancer/treatment-type…nes.html).

Vaccines are substances that help your immune system learn to fight off something that doesn’t belong there. We’re most familiar with vaccines that help prevent some types of infections, such as the flu vaccine. But vaccines might also be helpful in treating cancer, if the vaccine can get the immune system to see and attack cancer cells. It’s been hard to make effective cancer vaccines for several reasons, but mRNA might provide a way to make cancer vaccines that are more effective and easier to create.

https://www.cancer.org/cancer/managing-cancer/treatment-type…cines.html

Some vaccines help protect against viruses that cause cancer, while others are used to treat cancer. Learn more about cancer vaccines here.