Cancer and aging share seven of the nine hallmarks of aging, meaning that the molecular mechanisms that prompt aging often promote cancer, too. We talk to James DeGregori, a professor in the University of Colorado School of Medicine, to sort out why cancer and aging share such similarities. DeGregori describes his lab's theory of adaptive oncogenesis, which views cancer through the lens of evolution, to answer: If we slow down aging, do we also slow down rates of cancer?