A universal use of stem cell therapy is in the transplanting of blood cells (stem) as a treatment for conditions of the immune and blood system, some diseases or to repair the blood system following certain cancer treatments. For patients who have harshly serious burns on their body located on extensive areas, skin cells (stem) are used to develop skin grafts. In Europe, a new treatment for cornea damage has gained approval for marketing. As of now, the treatments mentioned are the only stem cell therapies conclusively proven as being efficient and unassailably safe.