Timing of rabbit antithymocyte globulin induction therapy in kidney transplantation: an observational cohort study
© Harrison et al.; licensee BioMed Central Ltd. 2014
Received: 13 August 2013
Accepted: 23 December 2013
Published: 3 January 2014
Literature on the timing of rabbit antithymocyte globulin (rATG) induction and its effects on kidney transplant outcomes is limited. The manufacturer recommends that the first dose be given intra-operatively, however this may present clinical practice risks and challenges. Our objective was to assess the impact of the timing of the first dose of rATG on kidney transplant outcomes.
Incident kidney transplant recipients (KTR) from January 2002 to December 2009 receiving the first dose of rATG post-operatively (Post, n = 353) or before reperfusion (Pre, n = 124) were evaluated. Outcomes assessed included eGFR at 1-year, delta eGFR (12 versus 1 month), and incidence of biopsy-proven acute rejection, graft loss, death, and a composite of the time-to-event outcomes. The impact of timing on outcomes was adjusted for potential confounders and assessed using linear and Cox regression models.
Among 435 KTR surviving with function to 12 months post-transplant, there was no significant difference in mean estimated glomerular filtration rate or eGFR (55.0 versus 56.7 mL/min, P = 0.46) and delta eGFR (1.8 versus 0.3 mL/min, P = 0.40) in Post versus Pre groups, respectively. At a median follow-up of 3 years, the composite endpoint (time to first biopsy-proven acute rejection, graft loss, or death) was similar by timing group (adjusted HR = 0.94; 95% CI: 0.58, 1.53, P = 0.81) in the total study population.
Timing of rATG had no appreciable impact on clinically relevant endpoints in this study cohort. These results support consideration of more flexible timing of the first dose of rATG induction in KTR.
KeywordsInduction therapy Kidney transplantation Outcomes Cohort study
Rabbit antithymocyte globulin (rATG, Thymoglobulin™, Genzyme Canada Inc., Mississauga, ON, Canada) is a polyclonal gamma immunoglobulin derived from the immunization of rabbits with human thymocytes and indicated for the prevention and treatment of acute kidney transplant rejection . Induction with rATG, together with maintenance immunosuppression (that is, calcineurin inhibitor, anti-metabolite, and corticosteroids), has been shown to be more effective than maintenance immunosuppression alone in preventing episodes of acute rejection in adult kidney transplant recipients (KTR) [2, 3]. However, adverse events such as fever, chills and gastrointestinal distress are more frequent with rATG than with other induction agents [4, 5]. Serious reactions such as cytokine release syndrome with hemodynamic instability can also occur and are most commonly associated with the first dose and rapid infusion rates .
The question of timing of first dose of rATG induction is relevant in clinical practice since operational factors may favor postoperative administration. The manufacturer advises intra-operative dosing, a recommendation supported by one randomized controlled trial in which intra-operative dosing led to a reduction in delayed graft function (DGF) and lower serum creatinine at 14 days post-transplant when compared to postoperative dosing . However, adverse drug events resulting from medication error occur commonly in the peri-operative setting and are a major cause of morbidity and mortality .
The operating room environment, with its multiple diversions and production pressures, dynamic changes in patient physiology, and the potential for provider fatigue, all contribute to this safety risk . For this reason, we have implemented a practice change at our center in recent years to begin administration of induction therapy in the immediate postoperative period. There is a paucity of published data to support this approach and little is known about the impact of timing of the initial dose on long-term outcomes.
The primary objective of this study was to compare renal function at one year in KTR receiving the first dose of rATG postoperatively versus prior to graft reperfusion. The secondary objective was to compare the risk of achieving the composite endpoint of biopsy-proven acute rejection (BPAR), graft loss, or death across induction timing groups.
Patients and methods
Study design and population
We conducted a single-center observational cohort study of all de novo KTR receiving rATG induction therapy from 1 January 2002 to 31 December 2009 with follow-up until 31 December 2010. We included all patients receiving at least one dose of rATG for the purpose of induction within 7 days of transplantation. Patients who received a partial course of another induction agent (for example, basiliximab) were included. Excluded from the analysis were multi-organ transplant recipients, cases of primary nonfunction, and patients undergoing desensitization protocols.
Standard maintenance immunosuppression during the study period included a calcineurin inhibitor, mycophenolate mofetil, and prednisone. Until 2005, the first-line calcineurin inhibitor was cyclosporine microemulsion, with C2 level monitoring to a target of 1,700 ng/mL post-transplant. Subsequently, tacrolimus became the standard calcineurin inhibitor with trough level monitoring to a target of 10 to 15 ng/mL or 5 to 8 ng/mL for high and low immunologic risk patients, respectively. Some patients at high risk of developing new-onset diabetes mellitus were initiated on cyclosporine microemulsion. Since 2005, the initial C2 target for cyclosporine microemulsion has been modified to 1,000 to 1,200 ng/mL. Standard steroid therapy included a pre-operative dose of intravenous methylprednisolone 1 mg/kg followed by an oral prednisone taper. Prior to 2006, patients received a slow prednisone taper to 5 mg per day over the first 3 months. Since 2006, all patients at low immunologic risk receive a rapid prednisone taper to 5 mg per day by postoperative day 7. Mycophenolate mofetil was used at a dose of 1 g orally twice daily starting immediately post-transplant. The dosing regimen was adjusted to 500 mg orally four times daily for patients experiencing adverse gastrointestinal effects. For refractory symptoms the dose of mycophenolate mofetil was reduced at the discretion of the treating physician.
Acute rejections were treated with intravenous corticosteroids, rATG, intravenous immunoglobulin, and/or plasmapheresis (the latter two treatments for acute antibody-mediated rejection). Rituximab was also used in cases of refractory acute antibody-mediated rejection. Biopsies were performed for indication and reviewed by a renal pathologist using the Banff classification.
Exposure and outcome assessment
Patients were grouped according to the timing of the first dose of rATG. Those who received the first dose prior to graft reperfusion (pre- or intra-operatively) were included in the ‘Pre’ group. Patients receiving the first dose of rATG postoperatively were included in the ‘Post’ group.
The primary outcome was the eGFR using the Chronic Kidney Disease Epidemiology Collaboration estimated glomerular filtration rate (CKD-EPI) equation at one year post-transplant . The secondary outcome was the composite endpoint of BPAR, graft loss, or death. All forms of acute rejection (T cell-mediated and antibody-mediated) were included in the composite endpoint. Graft loss was defined as the need to return to chronic dialysis or pre-emptive re-transplant. All deaths occurred prior to graft loss.
Recipient, donor, and transplant characteristics, as well as the indication for rATG induction, total rATG dose, starting time of rATG infusion and duration of therapy, were collected through a review of medical charts and our center’s Comprehensive Renal Transplant Research Information System (CoReTRIS) database. Recipient characteristics included age, sex, race, cause of end-stage renal disease (ESRD), body mass index, peak panel reactive antibody (PRA) level, time on dialysis, and re-graft status. Donor characteristics included donor type (deceased versus living), age, sex, and body mass index. Along with induction therapy, transplant characteristics included maintenance immunotherapy, occurrence of DGF (defined as the need for at least one dialysis session within the first week post-transplant) and transplant era (grouped as 2002 to 2004, 2005 to 2007, and 2008 to 2009). All of the above variables were included as potential confounders in our statistical models.
Total rATG dose (adjusted for weight) and indication for induction were also included in all statistical models. Indication categories included high-risk recipient and donor, high-risk recipient, high-risk donor, and low-risk recipient and donor. Categorization was based on the clinical assessment of the attending physician as noted in the medical chart. In addition, recipients were classified as high-risk if any of the following were noted: peak PRA greater than 10%, presence of known donor-specific antibody, or re-graft status. Donors were considered high-risk if they were expanded criteria (ECD) or donation after cardiac death (DCD).
Standard baseline characteristics were compared using parametric (unpaired t-test or one-way analysis of variance (ANOVA)) and non-parametric (Mann-Whitney U test or Kruskal-Wallis test) for continuous variables as appropriate. Proportions were compared using the Fisher’s exact or the chi-square tests. The association of timing and CKD-EPI eGFR at 12 months was evaluated while simultaneously accounting for confounding variables using multiple linear regression models. Changes in eGFR from month 1 to month 12 were also calculated in order to relate the induction timing strategy to the trajectory of eGFR over the first year post-transplant.
Time to the composite endpoint of first BPAR, graft failure, or death was examined using multivariable Cox proportional hazards models. The individual components of the composite endpoint were also evaluated separately. The timing of induction therapy was introduced as an indicator variable with the pre/intra-operative dosing strategy serving as the referent group. Other recipient, donor, and transplant covariates were introduced to adjust for potential confounding. An interaction term was used in our fully adjusted models to determine if donor type significantly modified the association between induction timing and each of the outcomes studied. The assumption of proportionality was graphically examined using log (cumulative hazard) plots and scaled Schöenfeld residuals. No important violations of the proportionality assumption were identified.
All analyses were performed using Stata/MP 11.2 (College Station, TX, USA). A two-sided P value of <0.05 was considered statistically significant. Approval for the study was obtained through the Research Ethics Board of the University Health Network.
A total of 555 KTR received induction therapy with rATG during the 8-year study period. From this cohort, 78 patients were excluded (38 in desensitization protocols, 21 multiple organ recipients, 14 with primary nonfunction, and 5 lacking follow-up data). Of the 477 remaining patients, 124 (26%) had rATG induction initiated prior to graft re-perfusion (Pre), while 353 (74%) started rATG post-operatively (Post). Overall, the median time to beginning the rATG infusion in the Post group was 7.3 hours from the time of leaving the operating room (interquartile range 5.4 to 15.1 hours; n = 268 observations). Median time to starting rATG was greater for those who developed DGF (n = 74) compared to those who did not (n = 194) (9.2 versus 6.6 hours respectively, P < 0.001).
Recipient, donor, and transplant characteristics
Total (n = 477)
Pre (n = 124)
Post (n = 353)
Mean recipient age (years)
48.5 ± 13.3a
51.3 ± 13.1
Mean height (cm)
167.9 ± 11.9
168.1 ± 9.9
Mean weight (kg)
77.7 ± 18.1
75.1 ± 16.3
Body mass index (kg/m2)
27.6 ± 5.8
26.5 ± 5.2
Cause of ESRD
Polycystic kidney disease
Median PRA (%)b
Median length of stay (days)b
Mean donor age (years)
45.8 ± 13.9
48.5 ± 14.2
Median donor CrCl (mL/min)b, c
110.6 (92.9, 137.6)
110.5 (91.5, 140.9)
Mean CIT (min)e
954.7 ± 314.7
810.7 ± 375.2
Donor type (%)
Transplant era (%)
2002 to 2004
2005 to 2007
2008 to 2009
Delayed graft function
rATG indication and treatment characteristics
Pre (n = 124)
Post (n = 353)
Indication for rATG
High risk recipient and donor
High risk recipient
High risk donor
Low risk recipient and donor
Mean total dose rATG (mg)
467.7 ± 157.5a
379.5 ± 160.0
Mean total weight-adjusted dose rATG (mg/kg)
6.0 ± 1.4
5.1 ± 2.0
Median number rATG dosesb
5 (4, 6)
5 (4, 6)
Linear regression models for mean CKD-EPI eGFR at 12 months and mean delta CKD-EPI eGFR at 1 versus 12 months
Mean CKD-EPI eGFRabeta coefficient for timing (95% CI)
Mean delta CKD-EPI eGFRabeta coefficient for timing (95% CI)
−1.67 (−6.07, 2.74)
1.52 (−2.06, 5.10)
−0.67 (−5.11, 3.77)
0.97 (−2.69, 4.63)
1.14 (−2.36, 4.64)
1.62 (−2.16, 5.41)
0.88 (−2.51, 4.27)
1.46 (−2.31, 5.23)
0.64 (−2.82, 4.11)
1.77 (−2.08, 5.63)
The difference in eGFR (that is, delta eGFR) from 1 to 12 months was similar across the groups (1.8 ± 16.4 versus 0.3 ± 17.2 mL/min for Post versus Pre groups, P = 0.40). In the adjusted model, the difference in delta eGFR for the Post versus Pre groups was not statistically significant (β = 1.77 (95% CI: -2.08, 5.63), P = 0.37) (Table 3).
Inclusion of an interaction term in our fully adjusted models revealed that donor type did not significantly modify the association between rATG timing and eGFR (12 months) and delta eGFR (1 to 12 months) (data not shown).
Composite of BPAR, graft loss or death
Cox model for biopsy-proven acute rejection, graft loss and death (n = 477) over 5-year follow-up
Number of eventsa
Pre (n = 124)b
Post (n = 353)b
Hazard Ratio (95% CI)c
0.90 (0.50, 1.64)
1.04 (0.41, 2.61)
0.54 (0.21, 1.39)
0.94 (0.58, 1.53)
Timing of the first dose of rATG induction prior to graft reperfusion had no significant impact on renal function at one year when compared to post-operative administration in this retrospective cohort study of adult KTR. In both the unadjusted and adjusted linear regression models, this difference remained nonsignificant. The CKD-EPI equation was used to estimate renal function as it has recently been shown to offer better performance when compared to the MDRD study equation in KTR . Furthermore, postoperative administration of rATG induction had no discernable effect on time to first BPAR, graft loss, death or the composite when evaluated over the 5-year follow-up period. These findings were confirmed in multivariable Cox regression models.
Notably, patients in the Post group were more likely to be older, recipients of deceased donor organs, transplanted later in the study period, and had longer lengths of stay in hospital. This is a reflection of time trends in the population transplanted at our center, with recipients of greater medical complexity and an increasing use of ECD and DCD donor organs in the more recent era. Lower dosing of rATG in the Post group reflects practice changes over time. In 2007, we instituted a new immunosuppression protocol for low-risk patients that included low dose rATG (3 mg/kg) for induction. In recent years there has also been a trend towards reducing the total dose of rATG induction for high-risk patients. However, when controlling for these variables in the adjusted model we observed no difference in outcome by the two timing strategies. In fact, the higher prevalence of negative risk factors and lower rATG dosing in the Post group would suggest that the presence of residual confounding bias would lead to worse outcomes for the Post group. This increases the robustness of our inferences.
A number of studies have shown the efficacy of postoperative rATG induction in reducing acute rejection rates [2–4], however others have suggested that intra-operative infusion may be preferable [5, 9–12]. In a prospective, randomized, controlled trial of intra-operative versus post-operative rATG among 58 KTR, Goggins et al. demonstrated that the incidence of DGF is reduced with administration prior to cross-clamp removal . Ischemia has been shown to cause endothelial activation and promotion of leukocyte adhesion and trafficking into the allograft, which in turn leads to expression of co-stimulatory molecules, cytokine release, and lymphocyte activation . Since rATG is comprised of antibodies to many of these ischemic-reperfusion injury mediators, it may act to attenuate this response [14, 15]. While the intra-operative group had a lower mean serum creatinine at 14 days post-transplant, this early difference in renal function was not statistically significant by day 30 .
From a practice standpoint, operational factors favor postoperative administration of rATG. Preparation of this drug involves dose calculation, reconstitution of multiple medication vials, dilution in an appropriate volume, and limited stability that precludes advance admixing. Pre-medication is required, and the infusion must be run through a high-flow vein using an inline filter over a minimum of 6 hours with close monitoring . While some centers have been able to address these issues through strategies such as order sets, protocols, education, and involvement of the clinical pharmacist, time between patient arrival and transfer to the operating room is often insufficient to allow for pre-operative dosing and physical transport of the patient with rATG infusing may present a challenge.
Intra-operative dosing also introduces safety risks such as erroneous administration technique, which has consistently been one of the most harmful types of medication errors in health systems reporting . The typical process for medication administration in the operating room is dramatically abbreviated and lacks the usual safeguards that exist in other areas of the hospital . In a Canadian survey of 687 anesthesiologists, 85% report a drug error or a near miss in clinical practice . In a New Zealand study, 12.5% of practitioners surveyed reported that they were aware of harm caused to a patient as a result of a drug administration error . In mid-2007, computerized prescriber order entry was instituted on the inpatient wards at our hospital. This change introduced further complexities to the peri-operative workflow since the operating room retained a paper-based process. Due to the occurrence of a number of severe intra-operative medication errors involving rATG, a practice change was instituted in late 2007 to have rATG administered in the immediate post-operative setting. This allowed for management by experienced staff, simplified workflow, and has since eliminated serious medication errors associated with rATG at our center.
While intra-operative administration of rATG may have a favorable impact on short-term outcomes, there is limited literature to show that a benefit is maintained over time. Such short-term outcomes are certainly relevant, however induction therapy may also have more durable effects that are important to examine. Potential long-term benefits of rATG induction may include improved graft survival by decreasing acute rejection rates and limiting exposure to calcineurin inhibitors in the early post-transplant period. In our study, we observed no differences by timing of rATG induction on clinically meaningful endpoints including eGFR, BPAR, graft loss, or death over the follow-up period.
Our study addresses a clear gap in the literature. The single previous report evaluating timing of rATG induction in KTR involved a small number of patients with a follow-up period of only 30 days. With the shift in clinical practice at our institution we had a unique opportunity to examine the impact of rATG induction timing. The present study is the largest to date and has a median duration of follow-up of 3 years. The use of multivariable regression modeling to adjust for potential confounders strengthens our analysis of timing of induction therapy as it relates to meaningful clinical endpoints. Despite the shift in the later era towards post-operative administration, there remained a significant degree of overlap between pre- versus post-operative administration during the 8-year study period, with good representation of both high and low risk patients in both Pre and Post groups across all transplant eras.
There are limitations to our study that deserve mention. First, this was not a randomized controlled trial, and therefore the possibility of residual confounding exists. To reduce this risk, data were retrieved through a systematic chart review, all variables were defined a priori, and multivariable modeling was used to account for differences in baseline characteristics between the groups. Moreover, an assessment of the effectiveness (versus efficacy) of rATG timing in the real world setting is best estimated using a clinical cohort. Second, there may have been a selection bias related to timing since, following implementation of the practice change, 23% of patients in the later era still received rATG pre-operatively. It is possible that some of these cases may have had higher risk features that were not captured in our baseline analysis and may have been pre-disposed to worse outcomes. Notably, it is routine practice in our center to admit patients for living donor kidney transplantation on the night before surgery which allows adequate time for pre-operative rATG administration. This likely accounts for the majority of patients in the Pre group in the later era. Third, since rATG was often prescribed in response to the development of DGF post-operatively, it was not possible to analyze the impact of rATG timing on the incidence of DGF without significant confounding by indication. However, the occurrence of DGF in the early postoperative period was included as a confounder in our statistical models. Fourth, because this study was conducted in a single institution, the findings may not be entirely generalizable to other settings. Finally, although this is the largest study to date on the issue of induction timing and kidney transplant outcomes, it may have been underpowered to rule out small treatment effects.
The results of this retrospective cohort study of KTR suggest that pre/intra-operative versus postoperative administration of rATG induction has similar implications for renal function at one year post-transplant. Moreover, the risk of developing clinically relevant endpoints over a 5-year follow-up period was comparable across rATG timing groups. While our results do not definitively rule out a small but meaningful benefit of pre/intra-operative administration of rATG, we believe our findings open the door to explore more flexible timing strategies for the first dose of rATG induction therapy in kidney transplantation.
JJH (BScPharm, MSc) is the Pharmacy Clinical Site Leader for the Multi-Organ Transplant Program and the Department of Pharmacy Services, Toronto General Hospital, University Health Network. She is also Assistant Professor (Status) with the Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario. BH (BScPharm, MSc) is a Staff Pharmacist with the Multi-Organ Transplant Program and the Department of Pharmacy Services, Toronto General Hospital, University Health Network. He is also Assistant Professor (Status) with the Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario. YL (MSc) is a Statistician with the Kidney Transplant Program and Division of Nephrology, Toronto General Hospital, University of Toronto, Toronto, Ontario. OF (dipHSM, MPH, MEd, CHE, DHA (c)) is the Research Manager for the Kidney Transplant Program and Division of Nephrology, Toronto General Hospital, University Health Network, Toronto, Ontario. SJK (MD, PhD, MHS, FRCPC) is a Transplant Nephrologist with the Kidney Transplant Program, Toronto General Hospital, University Health Network and the Division of Nephrology, Toronto General Hospital and St Michael’s Hospital, University of Toronto, Toronto, Ontario.
Biopsy-proven acute rejection
Chronic Kidney Disease Epidemiology Collaboration
Donation after cardiac death
Delayed graft function
Extended criteria donor
estimated glomerular filtration rate
End-stage renal disease
Kidney transplant recipients
Modification of diet in renal disease
Panel reactive antibodies
rabbit antithymocyte globulin.
The authors wish to thank Renee Woo, Jenny Limcangco, Marsail Wanis, and the students in the Multi-Organ Transplant Student Research Training Program for their contributions to the data collection, entry, and auditing.
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