Fifteen years later: main lessons from composite tissue allografts.

Abstract

Composite tissue allografts (CTA) are also called "reconstructive transplantation" as they are a valid alternative approach to repairing complex tissue defects. These procedures are still considered "experimental" and their therapeutic value remains to be validated. An immunosuppressive treatment similar to that used in solid organ transplantation allows CTA survival and function despite a high rate of acute rejection (AR) episodes. Clinical experience seems to confirm that skin is the most antigenic tissue and the first target of AR episodes, which are easy to reverse and do not seem to adversely influence graft survival and function when promptly treated. Chronic rejection can also occur in CTA, although its features are still unclear. Upper-extremity or face-transplanted patients show a relevant sensorimotor recovery. Patients are able to perform the majority of daily activities and to lead normal social lives. Global cortical remodeling occurs in the months following transplantation, reversing the functional reorganization induced by the amputation. Appropriation of the graft occurs in parallel with functional recovery. The patients' compliance is essential for the success of CTAs as well as careful recipient selection and patient follow-up to prevent complications of long-term immunosuppression.