Introduction Stem cell transplants are an important part of healthcare. Physicians and researchers use them to treat many different conditions, like autoimmune diseases, cancers, blood disorders, and many other diseases. A new study raises the possibility that stem cell donors are passing along mutations to recipients. This may have long-standing implications for different recipients. Stem Cell Uses Overview Stem cells are a naturally occurring cell in the body that can turn into many different other types of cell lines. Stem cells can be used for aging, diseases of the nervous system, cardiovascular diseases, autoimmune diseases, cancer, and many more conditions.