Autologous stem cells are derived from the patient's own body, the cells have perfect histocompatibility and the patient doesn’t need to do any matching. There is a high cell utilization rate and no immune rejection after implantation. Allogeneic stem cells are stem cells derived from donors other than the patient him/herself, Allogeneic stem cells are often with low-level immunogenicity. Autologous stem cell transplantation is not recommended for patients with infectious diseases, major genetic diseases, or other major diseases.