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* Renal Section, Division of Medicine, Imperial College London, Hammersmith Hospital, London, United Kingdom;
Renal Division, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205; and
Transplantation Research Center, Renal Division, Brigham and Womens Hospital and Childrens Hospital Boston, Harvard Medical School, Boston, MA 02115
Modern immunosuppressive regimens for organ transplantation have resulted in excellent short-term results but less dramatic improvements in long-term outcomes. Moreover, they are associated with significant deleterious effects. One solution that should avoid the adverse drug effects and result in improved graft and patient longevity as well as positively impacting on the organ shortage is the establishment of transplantation tolerance. Ever since the original description of transplantation tolerance in rodent allografts, there have been significant efforts made to translate tolerance-promoting strategies to the clinical arena. However, >50 years later, we are still faced with significant barriers that are preventing such a goal from being widely attained. Nonetheless, pilot clinical tolerance protocols are underway in selected transplant recipients. In this review, we discuss the scientific and nonscientific issues that must be overcome for successful transplantation tolerance to become a clinical reality.
The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.
1 Address correspondence and reprint requests to Dr. Mohamed H. Sayegh, Brigham and Womens Hospital, 221 Longwood Avenue, Boston, MA 02115. E-mail address: msayegh{at}rics.bwh.harvard.edu
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