Transplantation of Vascularized Composite Mandibular Allografts in Young Cynomolgus Monkeys

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Abstract
In the search for donor tissue for massive craniofacial defects, the transplantation of somatic tissue allografts was explored. Four young, out-bred cynomolgus monkeys were the recipients of orthotopic hemimandibular allotransplants from nonrelated cynomolgus monkeys. The transplant consisted of one-half of the mandible with attached muscle, skin, and mucosa. Cyclosporine 15 mg/kg/day was given subcutaneously each day. The 4 monkeys were observed for 13, 27, 63, and 65 days, respectively. All transplants showed primary wound healing and hair growth. The 2 longest survivors chewed, ate a normal diet, and gained weight. Two allografts showed severe rejection signs at 2 to 3 weeks, and the monkeys were euthanized. One monkey had a second episode of rejection that could not be reversed, and it was killed. The fourth monkey died of undetermined causes.

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