Focal therapy—an investigational approach to prostate cancer offered in only a minority of practices—aims to spare men the incontinence, impotence and even penile shortening that have made treating the disease one of the most controversial and polarizing fields in medicine. Today’s patient is the perfect candidate for it. “He’s exactly the sort of guy we want to find,” Ahmed says. “Young, keen on maintaining as much function as possible, intermediate-risk disease, good life expectancy—so he’s got a lot of years to live with the treatment he gets.”