Abstract
Two monoclonal antibody preparations against the α-chain of the interleukin-2 receptor (IL-2Rα) are available for use, basiliximab and daclizumab, a chimeric and a humanised antibody, respectively. The first clinical studies have demonstrated the efficacy of these agents as induction therapy to reduce the rate of acute rejection after organ transplantation. Basiliximab and daclizumab have a similar effect on prevention of acute rejection. Likewise, incidence of infections and malignancies are not different between the two treatment options. Anti-IL-2Rα therapy was very well tolerated in clinical trials.
Phase III studies with basiliximab have been undertaken with a two-dose regimen, consisting of two doses of 20mg, in an attempt to saturate the IL-2Rα on peripheral blood T lymphocytes for an average of 4–6 weeks. In contrast, the daclizumab dose is corrected for bodyweight and the goal is to achieve IL-2Rα blockade for 12 weeks. Phase III efficacy trials with daclizumab have, therefore, been developed with five doses of 1 mg/kg every 2 weeks in the first 2 months after transplantation. Whether or not it is a benefit to have blockade of the IL-2Rα for 10–12 weeks (daclizumab) compared with 4–6 weeks (basiliximab) remains unknown. Assuming 4–6 weeks would be sufficient for prevention of acute rejection, many centres have changed the protocol of daclizumab administration to two doses, the first dose given at the time of transplantation, the second 10 or 14 days after, with good success. Therefore, it seems feasible to limit the dose of daclizumab, which increases the ease of administration and probably also the cost effectiveness of this agent.
There are no controlled studies comparing basiliximab and daclizumab, nor have different dose regimens been directly compared in renal transplantation. The data available suggest the differences are small, if present at all, and it is unlikely that such a trial will ever be done. With both compounds, a significant reduction in the number of acute rejection episodes following solid organ transplantation can be obtained without an increase in adverse effects or infectious complications.
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No sources of funding were used to assist in the preparation of this manuscript. The authors have no conflicts of interest that are directly relevant to the content of this review.
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van Gelder, T., Warlé, M. & ter Meulen, R.G. Anti-Interleukin-2 Receptor Antibodies in Transplantation. Drugs 64, 1737–1741 (2004). https://doi.org/10.2165/00003495-200464160-00001
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DOI: https://doi.org/10.2165/00003495-200464160-00001