While the illness killed a staggering 8.8 million people in 2015, every cancer is unique. That’s why new treatment methods employing each patient’s DNA are emerging as oncologists’ most promising weapon. Cheaper and better genome sequencing now enables personalized immunotherapy tailored to a patient’s specific disease-fighting capabilities. There are 20 times more public and private entities focused on this discipline than a decade ago, say experts, who credit such work with increased breast and brain cancer survival. Treatments can be exorbitant, but researchers are battling that condition, too.