STEM-CELL TRANSPLANTATION FOR SEVERE AUTOIMMUNE DISORDERS, WITH SPECIAL REFERENCE TO RHEUMATIC DISEASES

Animal models of autoimmune disease have been successfully used to exp lore peripheral stem cell transfusion and bone marrow transplantation. Allogeneic marrow transplants have been shown to suppress lupus-like disease and experimental allergic encephalomyelitis. Autologous transp lantation has also been successful in adjuvant arthritis. Operationall y, these may be considered as graft versus autoimmunity effects. In hu mans, adoptive autoimmunity, in which the donor becomes apparent in th e recipient, has been documented for myasthenia gravis and insulin dep endent diabetes mellitus. Of 9 allogeneic bone marrow transplants for rheumatoid arthritis, 4 patients have done well for many years while o ne relapsed after 2 years. In 2 cases, autologous marrow transplant ha s been used specifically to treat autoimmune disease: one patient with CREST had only a transient response and one patient with myasthenia g ravis had remission. While allogeneic bone marrow transplant is the mo st rational procedure, its use in nonmalignant disorders must be very carefully considered secondary to its toxicity and potential morbidity . The use of peripheral blood CD34+ cells with T cell depletion, may p romise complete or partial longterm remission but results of this ther apy need to be compared with other immunosuppressive combinations.