Monogenic immunodeficiency type 1 diabetes mellitus (T1DM) usually onsets in early age and has a long course of treatment. Because of T cell deficiency, patients are prone to recurrent infection, hemorrhage, sepsis, colitis or complications of diabetes mellitus, which lead to early death.~New clinical treatment schemes have been explored and introduced around the world. Sequential transplantation of umbilical cord blood stem cells and islet cells is the latest treatment method for these children. Early treatment of monogenic immunodeficiency T1DM children can avoid disease-related organ toxicity, infection risk associated with chronic immunosuppression, and possible prevention of autoimmune endocrine organ damage. Thus, sequential transplantation of umbilical cord blood stem cells and islet cells is the only possible cure for those patients currently.
This study evaluates the efficacy of sequential transplantation of umbilical cord blood stem cells and islet cells in children with monogenic immunodeficiency type 1 diabetes mellitus. Umbilical cord blood stem cell transplantation will be performed first. Children with stable immune reconstruction will than receive islet cell transplantation.