Prevention of Rejection in Cardiac Transplantation by Blockade of the Interleukin-2 Receptor with a Monoclonal Antibody
Ainat Beniaminovitz, M.D., Silviu Itescu, M.D., Katherine Lietz, M.D., Mary Donovan, N.P., Elizabeth M. Burke, R.N., Barbara D. Groff, R.N., Niloo Edwards, M.D., and Donna M. Mancini, M.D.
Background Alloantigen-activated T cells express the high-affinityinterleukin-2 receptor. Specific blockade of this receptor withthe human IgG1 monoclonal antibody daclizumab may prevent rejectionof allografts after cardiac transplantation without inducingglobal immunosuppression.
Methods We randomly assigned 55 nonsensitized patients undergoinga first cardiac transplantation to receive either inductiontherapy with daclizumab (1.0 mg per kilogram of body weight),given intravenously within 24 hours after cardiac transplantationand every two weeks thereafter, for a total of five doses, orgeneralized immunosuppressive therapy. Concomitant immunosuppressionwas achieved in both groups with cyclosporine, mycophenolatemofetil, and prednisone. The primary end points were the incidenceand severity of acute rejection, and the length of time to afirst episode of biopsy-confirmed rejection.
Results Of the 55 patients in the study, 28 were randomly assignedto receive daclizumab and 27 served as the control group. Duringinduction therapy, the mean frequency of acute rejection episodes(defined as a histologic grade of 2 or higher according to theclassification of the International Society of Heart and LungTransplants) was 0.64 per patient in the control group and 0.19per patient in the daclizumab group (P=0.02). Acute rejectiondeveloped in 17 of 27 patients in the control group (63 percent),as compared with 5 of 28 patients in the daclizumab group (18percent; relative risk, 2.8; 95 percent confidence interval,1.1 to 7.4; P=0.04). Throughout follow-up, there were nine patientswith episodes of acute rejection of histologic grade 3 in thecontrol group, as compared with two in the daclizumab group(P= 0.03), and the time to a first episode of rejection wassignificantly longer in the daclizumab group (P=0.04). Therewere no adverse reactions to daclizumab and no significant differencesbetween the groups in the incidence of infection or cancer duringfollow-up.
Conclusions Induction therapy with daclizumab safely reducesthe frequency and severity of cardiac-allograft rejection duringthe induction period.
Source Information
From the Divisions of Cardiology (A.B., B.D.G., D.M.M.) and Circulatory Physiology (A.B., D.M.M.) and the Department of Surgery (S.I., K.L., M.D., E.M.B., N.E.), ColumbiaPresbyterian Medical Center, New York.
Address reprint requests to Dr. Beniaminovitz at 177 Fort Washington Ave., MHB 5-435, New York, NY 10032, or at ab49{at}columbia.edu.
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