Surprising finding could pave way for universal cancer vaccine

An experimental mRNA vaccine boosted the tumor-fighting effects of immunotherapy in a mouse-model study, bringing researchers one step closer to their goal of developing a universal vaccine to “wake up” the immune system against cancer.

Published today in Nature Biomedical Engineering, the University of Florida study showed that like a one-two punch, pairing the test vaccine with common anticancer drugs called immune checkpoint inhibitors triggered a strong antitumor response.

A surprising element, researchers said, was that they achieved the promising results not by attacking a specific target protein expressed in the tumor, but by simply revving up the immune system — spurring it to respond as if fighting a virus. They did this by stimulating the expression of a protein called PD-L1 inside of tumors, making them more receptive to treatment. The research was supported by multiple federal agencies and foundations, including the National Institutes of Health.

Senior author Elias Sayour, M.D., Ph.D., a UF Health pediatric oncologist and the Stop Children's Cancer/Bonnie R. Freeman Professor for Pediatric Oncology Research, said the results reveal a potential new treatment path — an alternative to surgery, radiation and chemotherapy — with broad implications for battling many types of treatment-resistant tumors.