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Background Daclizumab, a humanized monoclonal antibody against the interleukin-2 receptor, reduced the risk of rejection without increasing the risk of infection among renal-transplant recipients and, in a single-center trial, among cardiac-transplant recipients. We conducted a multicenter, placebo-controlled, double-blind study to confirm these results in cardiac-transplant patients.
Methods We randomly assigned 434 recipients of a first cardiac transplant treated with standard immunosuppression (cyclosporine, mycophenolate mofetil, and corticosteroids) to receive five doses of daclizumab or placebo. The primary end point was a composite of moderate or severe cellular rejection, hemodynamically significant graft dysfunction, a second transplantation, or death or loss to follow-up within six months.
Results By six months, 104 of 218 patients in the placebo group had reached the primary end point, as compared with 77 of the 216 patients in the daclizumab group (47.7 percent vs. 35.6 percent, P=0.007), a 12.1 percent absolute risk reduction and a 25 percent relative reduction. The rate of rejection was lower in the daclizumab group than in the placebo group (41.3 percent vs. 25.5 percent). Among patients reaching the primary end point, the median time to the end point was almost three times as long in the daclizumab group as in the placebo group during the first 6 months (61 vs. 21 days) and at 1 year (96 vs. 26 days). More patients in the daclizumab group than in the placebo group died of infection (6 vs. 0) when they received concomitant cytolytic therapy.
Conclusions Daclizumab was efficacious as prophylaxis against acute cellular rejection after cardiac transplantation. Because of the excess risk of death, concurrent or anticipated use of cytolytic therapy with daclizumab should be avoided.
Source Information
From Oregon Health and Science University, Portland (R.E.H.); Cleveland Clinic Foundation, Cleveland (R.C.S.); Temple University School of Medicine, Philadelphia (H.J.E.); Sahlgrenska University Hospital, Göteberg, Sweden (C.-H.B.); University of Pittsburgh Medical Center, Pittsburgh (R.L.K.); University of Wisconsin Hospital and Clinics, Madison (R.B.L.); Medical University of South Carolina, Charleston (A.V.B.); and Roche Laboratories, Nutley, N.J. (R.D.G., R.P., L.C., R.D.M.).
Address reprint requests to Dr. Hershberger at the Department of Medicine/Cardiology, UHN-62, Oregon Health and Science University, 3181 SW Sam Jackson Park Rd., Portland, OR 97239, or at hershber{at}ohsu.edu.
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