The immune system as predator, slyly seeking cancerous prey

Researchers are fine-tuning immunotherapy to the point where it may soon be able to sic cancer patients’ T-cells only on cellular mutations that matter to the cancer’s survival. The idea is to save the T-cells’ limited energy so the body’s own cancer killers can complete the job without spilling a dangerous drop of their shape-shifter quarries' lifeblood.

Or something like that. Get the full story from The Atlantic: