Another key issue is whether or not stem cell research could actually make a meaningful difference in cancer research, while some argue that it could cure cancer, others say it's not worth the time and effort. “Cancer stem cells are the small number of cells within a tumor that drive the tumor's growth. These cells generally make up just 1% to 3% of all cells in a tumor” ("Cancer Stem Cell Research” 1). Figuring out how to stop these stem cell is the first step of finding a cure for cancer, but there are tremendous costs, such as risking the lives of patients with a new experimental tests or drugs. From cancer to complex genetic testing, the issues on stem cell research are a big problem. Human cloning is yet another major controversial topic