ELI5: Your immune system fights cancerous cells frequently. There's only a problem when the cancerous cells evolve to avoid this by "hiding" (typically by no lo

ELI5: Your immune system fights cancerous cells frequently. There's only a problem when the cancerous cells evolve to avoid this by "hiding" (typically by no longer releasing a "kill me" marker). The therapy basically gives your immune system the tools to identify cancerous cells.