Final answer:
There is a risk of rejection when using stem cells in medical treatments. Stem cell therapies have the potential for tissue rejection, requiring matching of donor and recipient to prevent immune system concerns such as graft-versus-host disease.
Step-by-step explanation:
There is a risk that rejection can be transferred when using stem cells in medical treatments. Stem cell therapies offer the potential to treat a variety of diseases, but they come with significant risks. Among these risks, the rejection of stem cells by the patient's immune system is a major concern since the transplanted cells can be seen as foreign. This is especially true for embryonic stem cells, which have a broad range of differentiation potential. Additionally, there are ethical and legal questions regarding the use of such cells. Therefore, proper matching of donor and recipient is crucial for the success of stem cell transplants to prevent issues like graft-versus-host disease and tissue rejection. Matching is not only important for compatibility but also to ensure that the immune system does not destroy the transplanted stem cells.