New York Times reports on a project set to kick off in the next few months in which three medical research centers -- the University of Michigan Comprehensive Cancer Center, Dana-Farber Cancer Institute, and Baylor College of Medicine -- will begin testing patients for the presence of cancerous stem cells to see if there's hope for therapeutically targeting them in the future. According to the article, detractors say that the theory of cancerous stem cells has yet to be proven and is not backed by scientific evidence.