HLA-Matched Kidney Transplantation in the Era of Modern Immunosuppressive Therapy
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1 HLA-Matched Kidney Transplantation in the Era of Modern Immunosuppressive Therapy Arun Amatya, MD; Sandy Florman, MD; Anil Paramesh, MD; Anup Amatya, PhD Jennifer McGee, MD; Mary Killackey, MD; Quing Ren, MD; Brent Alper, MD; Jean Heneghan, MS; Eric Simon, MD; Karen Sullivan, PhD; Douglas Slakey, MD; Rubin Zhang, MD Drs. Amatya, Ren, Alper, Heneghan, Simon, Sullivan, and Zhang are with the Department of Medicine, and Drs. Florman, Paramesh, McGee, Killackey, and Slakey are with the Department of Surgery, School of Medicine, Tulane University in New Orleans, Louisiana; Dr. Amatya is also with the Center for Health Statistics, University of Illinois at Chicago. BACKGROUND: The effect of HLA match on renal graft survival has become controversial as has the policy of mandatory sharing of kidneys. METHOD: We performed a retrospective analysis of HLA matched (M) and mismatched (MM) kidney transplants in our center. Tacrolimus, mycophenolic acid, and steroids were used as maintenance therapy and basiliximab induction was added for high-risk patients. RESULT: A total of 229 kidney transplants were included with median follow-up of 5.1 years. The 5-year deathcensored graft survival by Kaplan-Meier method was signifi cantly higher in the M group than in the MM group for deceased-donor kidney transplants (log-rank, p.018). This graft survival advantage was detected in patients with a peak panel reactive antibody (PRA) greater than 20% (p.023), but not in those with a PRA level of less than 20% (p.32). The graft survival was not statistically different for live donor kidney transplants (p.077). A mismatched kidney was an independent risk for graft loss (hazard ratio: 2.27, 95% confi dence interval: , p.047) and acute rejection was a signifi cant cause of graft loss in mismatched deceased-donor transplants (p.035). CONCLUSION: Acute rejection remains a signifi cant cause of graft loss in HLA-6-antigen mismatched deceaseddonor kidney transplants. Our data support mandatory sharing of HLA-matched kidneys in sensitized patients with a PRA level greater than 20%. Kidney transplant is the preferred treatment for selected patients with end-stage renal disease, as it prolongs life expectancy, improves quality of life, and decreases cost of long-term medical care compared with maintenance dialysis treatment. 1-5 The best method of allocating the limited number of available deceased-donor kidneys remains controversial. 6 In 1987, the United Network for Organ Sharing (UNOS) established a national program of sharing HLA-matched deceased-donor kidneys (3 pairs of HLA-A, B, and DR antigens identical in both donor and recipient). Superior graft survival was welldocumented with these shared kidneys. 7 In August 1990, the HLA-matching criteria was expanded to phenotypically matched kidneys (e.g., donor A2, A2, B8, B13, DR3, DR4 to recipient A2, A3, B8, B13, DR3, DR4: donor has homozygous antigen A2 and is phenotypically matched to recipient). 7 It was again expanded in March 1995 to zero mismatched kidneys (e.g., donor A2, B8, B13, DR3, DR4 to recipient A2, A3, B8, B13, DR3, DR4: failure to identify the 2nd A is usually due to the presence of homozygous antigen). 8 The lower incidence of rejection and the better graft survival of these HLAmatched kidneys was demonstrated in earlier studies However, a recent analysis indicated that the impact of HLA matching has steadily declined as more potent immunosuppressive agents have been used. 12 It has also been suggested that the mandatory sharing beyond the local allocation area for low sensitized patients with a panel reactive antibody (PRA) level less than 20% created logistical inefficiencies and tended to benefit white patients more than African American patients. 13 In January 2009, UNOS updated its policy that HLA-matched kidneys continue to be nationally shared for sensitized adult patients with PRA levels greater than 20%, and the locally matched patients have the highest priority regardless of PRA level. In this study, we analyzed the outcome of all HLA-matched kidney transplants that received potent immunotherapy with tacrolimus (TAC), mycophenolic acid (MFA), and steroids. We sought to answer the question of whether the aforementioned changes in policy would be supported using a single center s data in this era of modern immunosuppressive regimens. œ DOI: /dat May 2010 Dialysis & Transplantation 1
2 HLA-Matched Kidney Transplantation TABLE I. Transplant recipient characteristics of HLA-matched (M) and HLA-mismatched (MM) kidneys (mean SD). Deceased-donor Kidneys Materials and Method Study population We retrospectively compared the outcomes of HLA-matched and HLA-mismatched kidney transplants from January 1997 to December Any kidney transplant recipient who also received a pancreas, liver, or heart transplant was excluded from this study. Based on the 6 antigens at HLA-A, B, and DR loci, the HLA-matched group (M group) included all of the HLA M MM (n 73) (n 98) p-value Age (years) Sex Female 33 (45.2%) 36 (36.7%).26 Male 40 (54.8%) 62 (63.3%) Race African American 24 (32.9%) 72 (73.5%) <.0001 White 49 (67.1%) 23 (23.5%) Others 0 (0%) 1 (3%) BMI Peak PRA (%) Previous Transplants 14 (19.2%) 11 (11.2%).14 CIT (hours) WIT (minutes) Live Kidneys (n 26) (n 32) p-value Age (years) Sex Female 11 (42.3%) 13 (40.6%).92 Male 15 (57.7%) 19 (59.4%) Race African American 4 (15.4%) 13 (40.6%).23 White 20 (74.1%) 17 (54.8%) Others 2 (7.4%) 2 (6.5%) BMI Peak PRA (%) Previous Transplants 5 (19.2%) 0 (0%).01 CIT (hours) WIT (minutes) identical, phenotypically matched, and zero mismatched kidneys. The HLA-mismatched group (MM group) was used as comparison and it represented no match at any of the 6 HLA antigens (6-antigen mismatch). Both kidney transplants from deceased donors and living donors were studied for graft survival analysis, and deceased-donor kidney transplants were further subgrouped into those with peak PRA levels greater than 20% and those less than 20%. Immunosuppressive therapy Our standard triple immunosuppression regimen consisted of steroids, TAC, and MFA. High risk patients defined as prior transplant recipients, HLA-6-antigen mismatch, and those with PRA levels greater than 20% received basiliximab induction therapy. Intravenous methylprednisolone was administrated prior to reperfusion and tapered to maintenance oral prednisone. TAC doses were adjusted to keep the 12- hour trough levels between 10 to 12 ng/ml for the first 3 months, 7 to 10 ng/ml for the remainder of the first year, and 4 to 7 ng/ ml thereafter. Each patient received either mycophenolate mofetil (MMF) at 1 gram or enteric coated sodium mycophenolate (Myfortic) at 720 mg twice daily. Rejection Acute rejection was confirmed by kidney biopsy. The severity of rejection was defined according to Banff criteria. Rejection of grade 1 or below was initially treated with IV methylprednisolone. Thymoglobulin was used for steroid resistant rejection, or as initial therapy for any rejection of Banff grade 2 or higher. Thymoglobulin, plasmapheresis, and intravenous immune globulin (IVIG) were used for antibody mediated rejection. Standard antifungal, antibacterial, and cytomegalovirus prophylaxis were administered per protocol. Outcomes measures included: (1) death-censored graft survivals over 5 years, (2) incidence of biopsy confirmed and treated acute rejection, (3) quality of graft function as assessed by estimated glomerular filtration rate (egfr) using the Modification of Diet in Renal Disease equation, and (4) etiologies for the graft loss. Renal graft loss was defined by primary non-function or loss of renal function requiring chronic dialysis. Patient death included all mortalities from the time of kidney transplantation. Death with a functioning graft (DWFG) was excluded from graft survival estimate (death-censored). Graft failure was excluded from graft function calculation. Statistical methods Statistical analyses were performed using SAS version software (Cary, North Carolina). A 2 or Fisher exact test was used for count data and a t-test for continuous 2 Dialysis & Transplantation May 2010
3 TABLE II. Graft function and causes of graft loss between HLAmatched (M) and HLA-mismatched (MM) kidney transplants (mean SD). M MM p-value Deceased-Donor Kidneys Graft Function egfr at 1 year egfr at 3 year egfr at 5 year Causes of Graft Loss DWFG 10 (55.5%) 9 (28.1%).1 CAN 5 (27.7%) 7 (21.8%).9 Rejections 0 (0%) 9 (28.1%).035 Others 3 (16.6%) 7 (21.8%).70 Live Kidneys Graft Function egfr at 1 year egfr at 3 year egfr at 5 year Causes of Graft Failure DWFG 2 (33.3%) 2 (22.2%).53 CAN 2 (33.3%) 3 (33.3%).62 Acute Rejections 0 (0%) 3 (33.3%).22 Others 2 (33.3%) 1 (11.1%).25 measures. Product-limit estimates of survival curves were generated by Kaplan- Meier method and the survival difference was analyzed by log-rank test. A multivariable Cox proportional hazard regression analysis with a stepwise variable selection was performed to examine the risk factors for the graft loss. A p-value <.05 was considered statistically significant. Results A total of 229 consecutive kidney transplants that met the study criteria were identified during the 11-year period. Median follow-up was 5.1 years (range, months) as of December 2008 and all were transplanted more than 1 year before this study. Table I summarizes the transplant recipient demographic characteristics of the 2 groups. There was no difference in age, sex, body mass index (BMI), warm ischemia time (WIT), or cold ischemia time (CIT) in either deceaseddonor kidney transplants or live-kidney transplants between the 2 groups. However, African American ethnicity represented an overwhelmingly higher proportion in the MM group, while white ethnicity was the majority of the M group (p <.0001). The peak PRA was significantly higher in the M group than the MM group for deceaseddonor kidney transplants. These different distributions become less significant in live donor kidney transplants (Table I). There were no differences in the graft function as measured by egfr between the M and MM groups for both deceased-donor and live-kidney transplants (Table II). The 5-year cumulative incidence of biopsy confirmed and clinically treated acute rejection were significantly higher in the MM group than in the M group for both deceased-donor (Figure 1A, 27.6% versus 9.6%, p.003) and live-kidney transplants (Figure 1B, 34.4% versus 3.8%, p.01). The relative risk (RR) of acute rejection was 2.94 (95% confidence interval [CI]: , p.003) in mismatched deceased-donor kidney transplants, and 9.09 (95% CI: , p.01) in mismatched livekidney transplants. The 5-year death-censored graft survival estimated by the Kaplan-Meier method was significantly higher in the M group than in the MM group for deceased-donor kidney transplants (Figure 2). The estimated deceased-donor graft survivals at 1, 3, and 5-years were 100%, 89%, and 84% in the M group, and 93%, 79%, and 70% in the MM group (log-rank, p.018). We further sub-analyzed deceased-donor graft survivals by their peak PRA levels (PRA <20% versus >20%). There was no survival difference between the M and MM groups for PRA levels less than 20% (Figure 3A). The estimated graft survival at 1, 3, and 5- years were 100%, 82%, and 78% in the M group, and 94%, 81%, and 69% in the MM group (log-rank, p.32). However, for sensitized patients with PRA levels greater than 20%, HLA-matched deceased-donor kidney transplants had a superior graft survival compared with mismatched transplants (Figure 3B). The estimated graft survival at 1, 3, and 5-years were 100%, 96%, and 90% in the M group, and 88%, 75%, and 75% in the MM group (log-rank, p.023). For live-kidney transplants, there was no statistical significance in the graft survival between the M and MM groups (Figure 4). The estimated living-donor graft survival at 1, 3, and 5-years were 100%, 100%, and 89% in the M group, and 93%, 81%, and 72% in the MM group (log-rank, p.077). The causes of graft loss are summarized in Table II. DWGF and chronic allograft nephropathy (CAN) were the main causes of graft loss. Acute rejection did not cause any graft loss in the M groups of both deceased-donor and live donor kidneys, but it was an important cause of graft loss in the MM groups, especially in the deceased-donor kidney transplants (p.035). The risk factors for graft loss were also examined by Cox s proportional hazard regression analysis and significant risk factors were further analyzed by a stepwise variable selection model. The risk factors included recipient age, sex, race, BMI, PRA, previous transplant, CIT, WIT, and mismatched kidneys. Mismatched kidneys and recipient age were found to be œ May 2010 Dialysis & Transplantation 3
4 HLA-Matched Kidney Transplantation independent risk factors for graft loss in deceased-donor kidney transplants with a hazard ratio (HR) of 2.27 (95% CI: , p.047) and 0.96 (95% CI: , p.0001), respectively. After adjusting for acute rejection, the effect of mismatched kidneys loses statistical significance (HR: 1.84, 95% CI: , p.142) indicating a mediating effect. Discussion FIGURE 1. The cumulative incidences of acute rejection between HLA-matched (M) and HLAmismatched (MM) kidney transplants according to donor origins. (A) Deceased donors; (B) living donors. FIGURE 2. Kaplan-Meier estimated death-censored graft survival between HLA-matched (M) and HLA-mismatched (MM) deceased-donor kidney transplants. Earlier studies demonstrated superior graft survival of HLA-matched kidney transplants compared with mismatched transplants This was mainly due to the lower incidence of rejection and graft loss from rejection in the matched kidneys. Over the last decade, several potent immunosuppressive agents have been introduced into clinical practice that have significantly reduced the incidence of rejection and improved graft survival. 14 A recent analysis suggested that the impact of HLA match on graft survival has steadily declined. 12 All of our patients received modern triple immunosuppressive agents as maintenance therapy. Our data indicated that HLA-matched deceased-donor kidney transplants still had significantly better 5- year graft survival than the mismatched deceased-donor transplants. However, this survival advantage was limited to the sensitized patients with PRA levels greater than 20%, and there was no survival difference in patients with PRA levels less than 20%. Our result supports UNOSs recently updated policy that mandatory sharing of HLA-matched kidneys should continue for sensitized adults with PRA levels greater than 20%. The intent was to increase kidney transplants for sensitized patients who otherwise would not receive an organ offer or have difficulty in matching an offered organ. Previous data have indicated that 65.7% of matched kidneys are allocated to the candidates with PRA levels less than 20%. 13 We also found that there were a significantly higher proportion of African American patients (73.5%) in the MM group with more white patients (67.1%) in the M group, which supports the notion that sharing of matched kidneys benefited the white patients more than the African American patients. 13 The peak PRA level was higher in the M group than the MM group, suggesting that kidney sharing may increase kidney 4 Dialysis & Transplantation May 2010
5 FIGURE 3. Kaplan-Meier estimated death-censored graft survival between HLA-matched (M) and HLA-mismatched (MM) deceased-donor kidney transplants according to the panel reactive antibodies (PRA). (A) PRA <20%; (B) PRA >20%. FIGURE 4. Kaplan-Meier estimated death-censored graft survival between HLA-matched (M) and HLA-mismatched (MM) living donor kidney transplants. transplantation in sensitized patients. The UNOS policy of sharing has been frequently criticized for the inevitably longer CIT and more severe ischemic injury in the shared kidneys. 15 However, we did not find significantly longer CIT in the M group compared with the MM group. The graft function, as measured by egfr, was also similar between the M group and the MM group. The living-donor kidney transplants provided better short-term (1-year) and long term (5-year) graft survival than the deceased-donor kidney transplants in both the M and the MM groups. We did not see a significant survival difference between the M and MM groups for live donor kidney transplants. This illustrates that the effect of HLA match is less consequential in live donor than in deceased-donor kidney transplants Living unrelated donor kidney transplants have better graft survival than deceased-donor kidney transplants despite more HLA mismatches in the former category This has been explained by the fact that living-donor kidneys are usually healthier and have less ischemic injury than deceased-donor kidneys. 17,21 The cumulative incidence of acute rejection was significantly higher in the MM group than the M group with a RR of 2.94 for rejection in mismatched deceased-donor kidneys and a RR of 9.09 in mismatched live donor kidneys. Our rejection rates were similar to the rates reported previously. 16,22,23 Acute rejection did not cause any graft loss in the M groups of both deceased-donor and live donor kidney transplants, but it was a significant cause of graft loss in the MM groups. Interestingly, HLA-mismatch was initially found to be an independent risk for graft loss in deceased-donor kidney transplants with a HR of When adjusted for acute rejection, the effect of mismatch lost significance, suggests that acute rejection is the mediating factor of HLA mismatch for graft loss in deceased-donor kidney transplants. An interleukin-2 receptor antibody (basiliximab) was used as an induction for our high risk patients including all patients in the MM group. It was suggested that more potent induction therapy with thymoglobulin can decrease the incidence of acute rejection and may prolong graft survival in high risk patients Therefore, induction with a T-cell depleting antibody should be considered for HLA-6-antigen mismatched deceased-donor kidney transplants. œ May 2010 Dialysis & Transplantation 5
6 HLA-Matched Kidney Transplantation This study provides the first singlecenter data examining the effect of HLA match on long-term graft survival. Among the strengths of this study is the fact that our patients were treated with 1 modern immunosuppressive regimen, the previous studies were based on either pooled multicenter data or UNOS data, and different immunosuppressive protocols were used in different transplant centers. Our study is limited by its retrospective nature and relatively small sample size in a single center that prevents the study of the impact of various HLA mismatching (1 to 5 HLAantigen mismatch). Our data indicate that mandatory sharing of HLA-matched kidneys remains beneficial for sensitized patients with PRA levels greater than 20%. It not only increases the access of kidney transplantation, but also provides superior long-term graft survival in sensitized patients. The impact of HLA match has become less consequential in low sensitized patients as well as living-donor kidney transplants. Acute rejection remains a significant cause of graft loss in HLA-6-antigen mismatched deceased-donor kidney transplants who were treated by basiliximab induction and tacrolimus, mycophenolic acid, and steroids as maintenance. More potent induction therapy may be needed to reduce the incidence of rejection and to improve graft survival in those high risk patients. Acknowledgments We thank the members of the Tulane Abdominal Transplant Institute for maintaining the transplant data base. D&T References 1. Zhang R, Kumar P, Ramcharan T, Reisin E. Kidney transplantation: the evolving challenges. Am J Med Sci. 2004;328(3): Schnuelle P, Lorenz D, Trede M, Van Der Woude FJ. Impact of renal cadaveric transplantation on survival in end-stage renal failure: evidence for reduced mortality risk compared with hemodialysis during long-term follow-up. J Am Soc Nephrol. 1998;9(11): Port FK, Wolfe RA, Mauger EA, Berling DP, Jiang K. Comparison of survival probabilities for dialysis patients versus cadaveric renal transplant recipients. JAMA. 1993;270(11): Ojo AO, Port FK, Wolfe RA, Mauger EA, Williams L, Berling DP. Comparative mortality risks of chronic dialysis and cadaveric transplantation in black endstage renal disease patients. Am J Kidney Dis. 1994;24(1): Abecassis M, Bartlett ST, Collins AJ, et al. Kidney transplantation as primary therapy for end-stage 6 Dialysis & Transplantation May 2010 renal disease: a National Kidney Foundation/Kidney Disease Outcomes Quality Initiative (NKF/ KDOQITM) conference. Clin J Am Soc Nephrol. 2008;3(2): Gaston RS, Danovitch GM, Adams PL, et al. The report of a national conference on the wait list for kidney transplantation. Am J Transplant. 2003;3(7): Takemoto S, Terasaki PI, Gjertson DW, Cho YW, Cecka JM. Survival of nationally shared HLAmatched kidney transplants from cadaveric donors. N Engl J Med. 1992;327(12): Takemoto SK, Terasaki PI, Gjertson DW, Cecka JM. Twelve years experience with national sharing of HLA-matched cadaveric kidneys for transplantation. N Engl J Med. 2000;343(15): Stegall MD, Dean PG, McBride MA, Wynn JJ. Survival of mandatorily shared cadaveric kidneys and their paybacks in the zero mismatch era. Transplantation. 2002;74(5): Norman DJ. The kidney transplant wait-list: allocation of patients to a limited supply of organs. Semin Dial. 2005;18(6): U.S. Organ Procurement and Transplantation Network and the Scientifi c Registry of Transplant Recipients OPTN/SRTR Annual Report: Transplant Data org/annual_reports/curretn/data_tables_section5.html. Accessed October 15, Su X, Zenios SA, Chakkera H, Milford EL, Chertow GM. Diminishing signifi cance of HLA matching in kidney transplantation. Am J Transplant. 2004;4(9): OPTN/UNOS Transplantation Committee. Report to Board of Directors, June Available at: Accessed October 15, Opelz G, Dohler B. Effect of human leukocyte antigen compatibility on kidney graft survival: comparative analysis of two decades. Transplantation. 2007;84(2): Lee CM, Carter JT, Alfrey EJ, Ascher NL, Roberts JP, Freise CE. Prolonged cold ischemia time obviates the benefi ts of 0 HLA mismatches in renal transplantation. Arch Surg. 2000;135(9): Ceckaa JM, Reed EF. Histocompatibility testing, crossmatch, and allocation of kidney transplants. In: Danovitch G. Handbook of Kidney Transplantation, 4th ed. New York: Lippincott, Williams & Wilkins; 2005: Terasaki PI, Cecka JM, Gjertson DW, Takemoto S. High survival rates of kidney transplants from spousal and living unrelated donors. N Engl J Med. 1995;333(6): Gjertson DW, Cecka JM. Living unrelated donor kidney transplantation. Kidney Int. 2000;58(2): Foss A, Leivestad T, Brekke IB, et al. Unrelated living donors in 141 kidney transplantations: a one-center study. Transplantation. 1998;66(1): Humar A, Durand B, Gillingham K, Payne WD, Sutherland DE, Matas AJ. Living unrelated donors in kidney transplants: better long-term results than with non-hla-identical living related donors? Transplantation. 2000;69(9): Terasaki PI, Koyama H, Cecka JM, Gjertson DW. The hyperfi ltration hypothesis in human renal transplantation. Transplantation. 1994;57: Fuller TF, Feng S, Brennan TV, Tomlanovich S, Bostrom A, Freise CE. Increased rejection in living unrelated versus living related kidney transplants does not affect short-term function and survival. Transplantation. 2004;78(7): Prommool S, Jhangri GS, Cockfi eld SM, Halloran PF. Time dependency of factors affecting renal allograft survival. J Am Soc Nephrol. 2000;11(3): Hardinger KL, Brennan DC, Schnitzler MA. Rabbit antithymocyte globulin is more benefi cial in standard kidney than in extended donor recipients. Transplantation. 2009;87(9): Willoughby LM, Schnitzler MA, Brennan DC, et al. Early outcomes of thymoglobulin and basiliximab induction in kidney transplantation: application of statistical approaches to reduce bias in observational comparisons. Transplantation. 2009;87(10): Taber DJ, Weimert NA, Henderson F, et al. Long-term effi cacy of induction therapy with anti-interleukin-2 receptor antibodies or thymoglobulin compared with no induction therapy in renal transplantation. Transplantation Proc. 2008;40(10):
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