Here’s the relevant bit about how it works, in conjunction with inhibitors:
“They discovered that mRNA vaccines work like an alarm, putting the body's immune system on high alert to recognize and attack cancer cells.
In response, the cancer cells start making the immune checkpoint protein PD-L1, which works as a defense mechanism against immune cells. Fortunately, several immune checkpoint inhibitors are designed to block PD-L1, creating a perfect environment for these treatments to unleash the immune system against cancer.”