Background: Although the utility of antibody induction therapy has been demonstrated in clinical trials, the ideal regimen to use based on patient risk factors has not been fully elucidated. The objectives of this study were to determine the impact of either anti-interleukin-2 receptor antibodies (IL-2RA) or thymoglobulin induction therapies versus no induction therapy on acute rejection rates and on 3-year graft survival rates.
Methods: This retrospective analysis compared 3 patient groups-those who did not receive induction, those who received IL-2RA induction, and those who received thymoglobulin induction.
Results: Three hundred eleven patients were included in this study. Patients were well matched for demographic and immunologic characteristics in the noninduced and IL-2RA induction therapy groups; the thymoglobulin induction group included significantly higher risk patients. The acute rejection rates were significantly lower in the IL-2RA and thymoglobulin groups when compared with the no induction therapy group (28% vs 15% vs 41%, respectively; P = .001), which was confirmed with multivariate analysis. The 3-year graft loss rates (no induction 21% vs IL2-RA induction 19% vs thymoglobulin induction 25%; P > .50) and creatinine concentrations (no induction 1.8 +/- 0.7, IL-2RA induction 2.0 +/- 1.0, and thymoglobulin induction 1.9 +/- 1.2; P = .47) were similar between all groups.
Conclusion: The use of induction therapy significantly reduces the incidence of acute rejection. The use of thymoglobulin induction equalizes 3-year graft survival rates in high-risk patients to those seen in low-risk patients receiving either no induction or IL-2RA induction.
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