‘Universal cancer vaccine’ trains the immune system to kill any tumor | Using mice with melanoma, researchers found a way to induce PD-L1 expression inside tumors using a generalized mRNA vaccine, essentially tricking the cancer cell into exposing itself, so immunotherapy can be more effective.

From the article: Following on from their breakthrough human trial that successfully reprogrammed the immune system to overpower glioblastoma, an aggressive brain tumor, the same scientists have now further developed the mRNA vaccine to fight not one but any cancer. It has the potential to do away with chemotherapy, surgery and radiation treatment.

University of Florida (UF) scientists have developed an experimental vaccine that dramatically boosts the immune system’s ability to fight tumors – even without targeting a specific cancer type. This “general purpose” mRNA jab works in a similar way to a Covid-19 vaccine but with a different target; it instructs the body’s immune cells to rally and hit any kind of tumor in the same way they would attack a viral spike protein.

“[This paper](https://www.nature.com/articles/s41551-025-01380-1) describes a very unexpected and exciting observation: that even a vaccine not specific to any particular tumor or virus – so long as it is an mRNA vaccine – could lead to tumor-specific effects,” said Elias Sayour, a pediatric oncologist and principal investigator at the RNA Engineering Laboratory at UF. “This finding is a proof of concept that these vaccines potentially could be commercialized as universal cancer vaccines to sensitize the immune system against a patient’s individual tumor.”

Sayour has spent a decade working to harness the power of mRNA science in order to effectively treat cancer. The success with the glioblastoma study led to broadening the treatment’s scope, not targeting one kind of tumor but instead focusing on giving the body’s immune system the tools to fight any kind of cancer cell. It’s part of a growing body of evidence that suggests mRNA vaccines might be a serious weapon in fighting the disease.

While the formulation isn’t unlike the Covid-19 vaccine, which uses lipid nanoparticles to deliver the genetic instructions to the body, it is still somewhat different. Instead of the drug encoding a virus protein, it sends a message to the immune system to rally the troops. It essentially tells the body to produce certain proteins that stimulate the immune system – including a protein within cancer cells known as PD-L1 (Programmed Death-Ligand 1), which makes tumors become more visible to immune cells.