Non-Induction Basiliximab to Facilitate Renal Recovery via Temporary Tacrolimus Cessation in Cardiothoracic Transplant Patients

<b>Introduction:</b> Reversible and irreversible nephrotoxicity are known complications of tacrolimus. Approaches to reduce the incidence of nephrotoxicity include the reduction or avoidance of tacrolimus but must be weighed against risk of rejection. Infrequently, basiliximab has been used outside of the induction period to facilitate temporary tacrolimus cessation in the setting of acute kidney injury (AKI). <b>Objective:</b> The primary objective of this study was to describe renal recovery after temporary tacrolimus cessation with non-induction basiliximab (NIB) compared to a matched cohort. <b>Methods:</b> We conducted a single-center study of adult cardiothoracic transplant recipients that received basiliximab beyond post-operative day 7 for temporary tacrolimus cessation in the setting of AKI between January 2019 and November 2023 and matched them to acontrol cohort. <b>Results:</b> Twelve patients underwent temporary tacrolimus cessation with NIB. In total, 7 (58%) patients achieved initial renal recovery at tacrolimus resumption compared to 15 (42%) patients in the matched cohort at an equivalent time point. No difference between treated rejection (17% vs. 19%, <i>p</i> = 0.80) or infection (75% vs. 50%, <i>p</i> = 0.32) was observed between tacrolimus cessation and its matched cohort. <b>Conclusions:</b> The use of NIB for tacrolimus cessation can allow for potential renal recovery after an AKI or in patients at risk of AKI. This approach does not appear to significantly increase the risk of rejection but may increase the risk of infection in the long term.