H Wyrley-Birch

Donation after Cardiac Death Kidneys with Low Severity Pre‐Arrest Acute Renal Failure

The widening gap between supply and demand for renal transplantation has prompted many centers to use donors after cardiac death. Some of these donors exhibit signs of acute renal failure (ARF) prior to cardiac arrest. Concern has been expressed about poor quality of graft function from such donors. In response to this perception, we reviewed 49 single renal transplant recipients from category III donors after cardiac death between 1998 and 2005, at out center. All kidneys but one had hypothermic machine perfusion and viability testing prior to transplantation. According to the RIFLE criteria, nine recipients had kidneys from donors with “low severity pre‐arrest ARF”. The remainder of the recipients were used as control group. There was no statistical significant difference in delayed graft function and rejection rates between these two groups. Recipients GFR at 12 months was 44.4 ± 17.1 and 45.2 ± 14.7 (mL/min/1.73m2) from donors with ARF and without ARF, respectively (p = 0.96). In conclusion, low severity ARF in kidneys from controlled after cardiac death donors can be a reversible condition after transplantation. Short‐term results are comparable to the kidneys from same category donors without renal failure, providing that some form of viability assessment is implemented prior to transplantation.

Post-Operative 3-Dimensional Contrast-Enhanced Ultrasound (CEUS) Versus Tc99m-DTPA in the Detection of Post-Surgical Perfusion Defects in Kidney Transplants: Preliminary Findings

PURPOSE 2800 renal transplants are carried out annually in the UK and it is standard practice to perform a Tc-DTPA renogram examination after surgery to check perfusion. This provides some functional information but suffers from low spatial resolution, is lengthy, immobile and costly and uses ionizing radiation. We surmised that contrast-enhanced ultrasound (CEUS) would provide an accurate alternative with increased speed, resolution (temporal and spatial), cost efficiency and safety. MATERIALS AND METHODS 97 renal transplant patients underwent both Tc-DTPA and CEUS after surgery to assess the perfusion of the graft. Tc-DTPA was performed in the nuclear medicine department with at least 10 minutes of continuous screening and a standard dose of 150 mBq Tc-DTPA. CEUS consisted of I. V. 2.4 ml Sonovue contrast agent, 60 seconds continuous capture and a 3 D acquisition of the organ. 3 D CEUS was assessed using QLab analysis software. RESULTS Tc-DTPA detected 9 perfusion defects of varying size. CEUS detected all these defects plus 14 further defects (0.2 - 17 % of total renal volume) not detected on DTPA. These results demonstrate a statistically significant divergence (p < 0.0001). Retrospective clinical correlation showed ligated polar arteries in 8 of these 14 cases. CONCLUSION CEUS will detect perfusion defects seen with Tc-DTPA and due to increased spatial and temporal resolution and multiple scanning angles, will detect further perfusion defects not seen on Tc-DTPA. 3 D CEUS is useful in the quantification of perfusion defects. CEUS is an accurate examination for detecting renal transplant perfusion defects and will detect significantly more defects than DTPA.

A Prospective Randomised Paired Trial of Sirolimus versus Tacrolimus as Primary Immunosuppression following Non-Heart Beating Donor Kidney Transplantation

Introduction: With calcineurin inhibitors potentiating damage from ischaemia-reperfusion injury in kidneys from donors after cardiac death we wanted to investigate the role of substituting sirolimus for tacrolimus in the delayed introduction of calcineurin inhibitor regime used in our centre. Method: A prospective randomised paired open-label study was performed taking pairs of kidneys from each donor and randomising one to a tacrolimus-based regime and the other to a similar regime based on sirolimus. Graft function at one year was the primary endpoint. Results: Total 31 pairs of kidneys were randomised to each group, with 19 pairs of recipients available for analysis after post-randomisation study exclusions. Despite a higher incidence of biopsy proven acute rejection in the sirolimus group, renal allograft function was similar in both groups at three-monthly intervals up to one year post-transplant. All episodes of acute rejection in the sirolimus group occurred in the first three months. Graft and patient survival at one year was 100% in the tacrolimus group, with one death with functioning graft in the sirolimus group (95% survival). Unfortunately, 10 of the 19 patients in the sirolimus arm required switch of medication to tacrolimus due to acute rejection or intolerable drug side effects. Conclusions: Graft survival and function were very similar in the two groups despite the higher rate of acute rejection in the sirolimus arm, raising the possibility that the damage done by acute rejection was adequately offset by the nephron-sparing effect of sirolimus compared to tacrolimus. Sirolimus may have a role as a longer-term maintenance immunosuppressant after initial treatment with a different agent such as tacrolimus or belatacept.

Laparoscopic versus open live donor nephrectomy: meta-analysis of randomized controlled trials

1 A Novel siRNA-Containing Solution Protecting Donor Organs in Heart Transplantation. Xiufen Zheng,1 Dameng Lian,1 Mu Li,1 Xusheng Zhang,1 Mahdieh Khoshniat,3 Hongtao Sun,1 Weihua Liu,1 Jifu Jiang,1 Dong Chen,1 Costin Vladau,1 Motohiko Suzuki,1 James C. Lacefi eld,3 Bertha Carcia,1,2 Anthony M. Jevnikar,1,2,3 Wei-Ping Min.1,2,3 1Department of Surgery, Pathology, and Microbiology & Immunology, University of Western Ontario, London, ON, Canada; 2Multi-Organ Transplant Program, London Health Sciences Centre, London, ON, Canada; 3Robarts Research Institute, London, ON, Canada. Background: Ischemia-reperfusion (I/R) injury occurs in organ transplantation. We hypothesize that siRNA can effectively suppress infl ammatory, apoptosis and complement genes which contribute to I/R injury. This study was designed to develop a novel siRNA-containing preservation solution, which offers an alternative for protection of donor organs. Methods: Multiple siRNAs that specifi cally target TNFα, Fas, and C3 genes were prepared using our newly-developed bio-synthesis method. Heart grafts from BALB/c mice were preserved in UW solution (control) or siRNA-containing UW solution (siRNA solution) at 4°C for 48 hrs, and subsequently transplanted into syngeneic BALB/c mice. Cardiac functions were quantitatively assessed by High Frequency Ultrasound. The I/R injury was assessed by immunohistochemistry. Results: After 48 hrs preservation in the siRNA solution, the expressions of TNFα, Fas, and C3 genes in the grafts were inhibited at mRNA and protein levels detected by qPCR and immunoblot. Using siRNA solution preserved organ as donor, the graft survival was signifi cantly prolonged in heart transplantation. While siRNA solution-treated heart grafts retained strong heartbeat up to the end point of observation (>70 days), the control grafts lost function within 7 days. In addition, an improved cardiac function was observed in the graft preserved in siRNA solution. Grafts treated by siRNA solution displayed normal function, whereas grafts preserved in control solution showed dysfunction as detected by ultrasound scanning. The protection of graft by siRNA solution is associated with prevention of I/R injury. siRNA solution-treated organs exhibited almost normal histological structures, less neutrophil and lymphocyte infi ltration as compared with control solution-treated organs. Furthermore, siRNA solution prevented apoptosis and necrosis of cardiac tissues. Conclusions: This is the fi rst demonstration of a novel siRNA solution that can prevent cardiac I/R injury, protect cardiac function, and prolong graft survival in heart transplantation, implying a signifi cant and potential application in clinic. Abstract# 2 The Long-Term Evaluation of HLA-Mismatched Combined Kidney and Bone Marrow Transplant Recipients after Complete Withdrawal of Immunosuppression. Tatsuo Kawai,1 David H. Sachs,2 Thomas Spitzer,3 Nina Tolkoff-Rubin,1 Susan Saidman,4 Winfred Williams,1 Bimalangshu Dey,3 Nelson Goes,1 Dicken Ko,1 Waichi Wong,1 Robert B. Colvin,4 Megan Sykes,2 A. Benedict Cosimi.1 1Transplantation Unit, Massachusetts General Hospital, Boston, MA; 2Trasnplant Biology Research Center, MGH, Charlestown, MA; 3Bone Marrow Transplant Unit, MGH, Boston, MA; 4Pathology, MGH, Boston, MA; 5this Study was Performed in Partnership with Immune Tolerance Network. BACKGROUND: Induction of allograft tolerance has been the ultimate goal in organ transplantation. METHODS: Five subjects with ESRD received combined kidney and bone marrow transplantation (CKBMT) from HLA mismatched donors. The preparative regimen consisted of cyclophosphamide, thymic irradiation, anti-CD2 mAb and a 9-14 months course of a calcineurin inhibitor. Two subjects also received two doses of antiCD20 mAb prior to transplant. RESULTS: All recipients developed transient mixed chimerism without GVHD.Complete withdrawal of immunosuppressive medication was achieved in 4/5 recipients with current immunosuppression-free survival exceeding 3.2, 2 The Long-Term Evaluation of HLA-Mismatched Combined Kidney and Bone Marrow Transplant Recipients after Complete Withdrawal of Immunosuppression. Tatsuo Kawai,1 David H. Sachs,2 Thomas Spitzer,3 Nina Tolkoff-Rubin,1 Susan Saidman,4 Winfred Williams,1 Bimalangshu Dey,3 Nelson Goes,1 Dicken Ko,1 Waichi Wong,1 Robert B. Colvin,4 Megan Sykes,2 A. Benedict Cosimi.1 1Transplantation Unit, Massachusetts General Hospital, Boston, MA; 2Trasnplant Biology Research Center, MGH, Charlestown, MA; 3Bone Marrow Transplant Unit, MGH, Boston, MA; 4Pathology, MGH, Boston, MA; 5this Study was Performed in Partnership with Immune Tolerance Network. BACKGROUND: Induction of allograft tolerance has been the ultimate goal in organ transplantation. METHODS: Five subjects with ESRD received combined kidney and bone marrow transplantation (CKBMT) from HLA mismatched donors. The preparative regimen consisted of cyclophosphamide, thymic irradiation, anti-CD2 mAb and a 9-14 months course of a calcineurin inhibitor. Two subjects also received two doses of antiCD20 mAb prior to transplant. RESULTS: All recipients developed transient mixed chimerism without GVHD.Complete withdrawal of immunosuppressive medication was achieved in 4/5 recipients with current immunosuppression-free survival exceeding 3.2, 2.5, 1.1 and 0.2 years. A recipient rejected his kidney allograft on day 10. (1) The most recent creatinine/GFR of these 4 subjects were 1.2/61, 1.6/75, 1.6/96 (by renogram), 1.8/71 ml/min, respectively. (2)Although Subjects 2 and 5 initially developed anti-donor antibodies (ADA), both recipients lost ADA by 10th and 3rd month, respectively. Subject 4 developed post-transplant de novo anti-class II ADA one month after discontinuation of his immunosuppression, but without any functional derangements. (3) Subjects 1, 2 and 4 showed donor specifi c hyporesponsiveness in CML and MLR after nine months. (4) Allograft biopsies taken at 3 years from Subjects 1 and 2 revealed normal glomerulus, no tubulitis and no vasculopathy by light and electron microscopic examination with no C4d staining. Biopsy taken at 1.5 years from Subject 4 showed positive C4d deposition with no changes diagnostic of rejection. A most recent biopsy taken from Subject 5 on day 243 showed no rejection. (5) In Subject 1, extensive warts due to human polyoma virus existed before transplantation, but it disappeared after discontinuation of immunosuppression. All four patients show no hypertension, no DM, no abnormal lipid profi les. CONCLUSIONS: Renal allograft function of CKBMT recipients has been stable up to 3 years after complete withdrawal of their immunosuppression. Abstract# 3 A Novel Human Anti-CD40 Monoclonal Antibody, 4D11, for Kidney Transplantation in Cynomolgus Monkeys, Effect of Induction and Maintenance Therapy. Takeshi Aoyagi,1 Tomomi Suzuki,1 Atsushi Sugitani,2 Atsushi Imai,1 Motohiro Uno,1 Ryoichi Goto,1 Kenichiro Yamashita,1 Toru Miura,3 Nobuaki Takahashi,3 Tomoo Itoh,4 Hiroyuki Furukawa,1 Satoru Todo.1 11st Dept of Surgery, Hokkaido Univ., Sapporo, Hokkaido, Japan; 21st Dept of Surgery, Kyusyu Univ., Hakata, Fukuoka, Japan; 3Kirin Brewery Co., Ltd, Takasaki, Gunma, Japan; 4Dept of Surgical Pathology, Hokkaido Univ. Hospital, Sapporo, Hokkaido, Japan. Background/Aim: We have previously demonstrated that a novel human anti-CD40 monoclonal antibody (mAb), 4D11, markedly prolongs renal allograft survival in cynomolgus monkeys. In this study, we evaluated the effect of induction and maintenance therapy using 4D11. Methods: Twenty-four monkey renal transplants were divided into three groups: no treatment (Control), induction (Group A) and maintenance (Group B) treatments. Groups A and B were further subdivided according to the dose of 4D11 (n=3 each). The 4D11 was given intravenously on days 0, 4, 7, 11 and 14 for the induction therapy. In the group B, a half of the initial dose was given weekly thereafter until day 180. Graft survival, graft histology, anti-4D11 and anti-donor antibodies were examined. Results: Treatment Group 4D11 (mg/kg) Graft survival (days) Mean (days) Cause of death No treatment Control 5, 6, 7 6.0 AR, AR, AR Induction A-I 5 >96, 79, 75 83.3 Alive, AR, AR A-II 10 >200, 107, 92 133.0 Alive, CAN, AR A-III 20 169, 105, 90 121.3 AR, AR, AR Maintenance B-I 1 80, 79, 10 56.3 AR, AR, AR B-II 5 >202, 98, 44 114.3 Alive, AR, AR B-III 10 374, 253, 27 218.3 AR, AR, UTI B-IV 20 216, 169, 153 179.3 CAN, AR, CAN AR: Acute rejection, CAN: Chronic allograft nephropathy, UTI: Urinary tract infection No adverse events were observed. Graft survival was markedly prolonged by the induction treatment, which was further extended by the maintenance treatment. While graft biopsies revealed grade II or III rejection in the control, majority of those from groups A and B at 1 month post-transplantation showed only a borderline change. Anti 4D11-Ab was detected only in group A-III after drug cessation. In addition, animals receiving induction treatment and those given maintenance treatment with high doses of 4D11 did not develop anti-donor Ab unless the treatment was discontinued. Conclusion: 4D11 exhibited potent immunosuppressive effect on renal allograft survival both by induction and maintenance treatments. Besides, anti-drug and anti-donor antibody productions were effectively suppressed by 4D11. Abstract# 4 Pre-Transplant (Tx) Donor-Specifi c B Cells in Highly Sensitized Patients (HS), Detected by Intracellular Cytokine Flow Cytometry (CFC) Predict Antibody Mediated Rejection (AMR). Mieko Toyoda,1 Andy Pao,1 Ashley Vo,1 Marina Lukovsky,1 Raju Radha,1 Tetsu Sado,1 Lara Baden,1 Anna Petrosyan,1 Stanley C. Jordan.1 1Transplant Immunology Laboratory and Comprehensive Transplant Center, Cedars-Sinai Medical Center, Los Angeles, CA. Background: Intravenous immunoglobulin treatment (IVIG-Rx) reduces panel reactive antibodies and crossmatch (CMX) positivity, facilitating CMX(-) kidney Tx in HS. However, high rates of allograft rejec

Outcomes of damaged donor livers following liver transplantation

1 A Novel siRNA-Containing Solution Protecting Donor Organs in Heart Transplantation. Xiufen Zheng,1 Dameng Lian,1 Mu Li,1 Xusheng Zhang,1 Mahdieh Khoshniat,3 Hongtao Sun,1 Weihua Liu,1 Jifu Jiang,1 Dong Chen,1 Costin Vladau,1 Motohiko Suzuki,1 James C. Lacefi eld,3 Bertha Carcia,1,2 Anthony M. Jevnikar,1,2,3 Wei-Ping Min.1,2,3 1Department of Surgery, Pathology, and Microbiology & Immunology, University of Western Ontario, London, ON, Canada; 2Multi-Organ Transplant Program, London Health Sciences Centre, London, ON, Canada; 3Robarts Research Institute, London, ON, Canada. Background: Ischemia-reperfusion (I/R) injury occurs in organ transplantation. We hypothesize that siRNA can effectively suppress infl ammatory, apoptosis and complement genes which contribute to I/R injury. This study was designed to develop a novel siRNA-containing preservation solution, which offers an alternative for protection of donor organs. Methods: Multiple siRNAs that specifi cally target TNFα, Fas, and C3 genes were prepared using our newly-developed bio-synthesis method. Heart grafts from BALB/c mice were preserved in UW solution (control) or siRNA-containing UW solution (siRNA solution) at 4°C for 48 hrs, and subsequently transplanted into syngeneic BALB/c mice. Cardiac functions were quantitatively assessed by High Frequency Ultrasound. The I/R injury was assessed by immunohistochemistry. Results: After 48 hrs preservation in the siRNA solution, the expressions of TNFα, Fas, and C3 genes in the grafts were inhibited at mRNA and protein levels detected by qPCR and immunoblot. Using siRNA solution preserved organ as donor, the graft survival was signifi cantly prolonged in heart transplantation. While siRNA solution-treated heart grafts retained strong heartbeat up to the end point of observation (>70 days), the control grafts lost function within 7 days. In addition, an improved cardiac function was observed in the graft preserved in siRNA solution. Grafts treated by siRNA solution displayed normal function, whereas grafts preserved in control solution showed dysfunction as detected by ultrasound scanning. The protection of graft by siRNA solution is associated with prevention of I/R injury. siRNA solution-treated organs exhibited almost normal histological structures, less neutrophil and lymphocyte infi ltration as compared with control solution-treated organs. Furthermore, siRNA solution prevented apoptosis and necrosis of cardiac tissues. Conclusions: This is the fi rst demonstration of a novel siRNA solution that can prevent cardiac I/R injury, protect cardiac function, and prolong graft survival in heart transplantation, implying a signifi cant and potential application in clinic. Abstract# 2 The Long-Term Evaluation of HLA-Mismatched Combined Kidney and Bone Marrow Transplant Recipients after Complete Withdrawal of Immunosuppression. Tatsuo Kawai,1 David H. Sachs,2 Thomas Spitzer,3 Nina Tolkoff-Rubin,1 Susan Saidman,4 Winfred Williams,1 Bimalangshu Dey,3 Nelson Goes,1 Dicken Ko,1 Waichi Wong,1 Robert B. Colvin,4 Megan Sykes,2 A. Benedict Cosimi.1 1Transplantation Unit, Massachusetts General Hospital, Boston, MA; 2Trasnplant Biology Research Center, MGH, Charlestown, MA; 3Bone Marrow Transplant Unit, MGH, Boston, MA; 4Pathology, MGH, Boston, MA; 5this Study was Performed in Partnership with Immune Tolerance Network. BACKGROUND: Induction of allograft tolerance has been the ultimate goal in organ transplantation. METHODS: Five subjects with ESRD received combined kidney and bone marrow transplantation (CKBMT) from HLA mismatched donors. The preparative regimen consisted of cyclophosphamide, thymic irradiation, anti-CD2 mAb and a 9-14 months course of a calcineurin inhibitor. Two subjects also received two doses of antiCD20 mAb prior to transplant. RESULTS: All recipients developed transient mixed chimerism without GVHD.Complete withdrawal of immunosuppressive medication was achieved in 4/5 recipients with current immunosuppression-free survival exceeding 3.2, 2 The Long-Term Evaluation of HLA-Mismatched Combined Kidney and Bone Marrow Transplant Recipients after Complete Withdrawal of Immunosuppression. Tatsuo Kawai,1 David H. Sachs,2 Thomas Spitzer,3 Nina Tolkoff-Rubin,1 Susan Saidman,4 Winfred Williams,1 Bimalangshu Dey,3 Nelson Goes,1 Dicken Ko,1 Waichi Wong,1 Robert B. Colvin,4 Megan Sykes,2 A. Benedict Cosimi.1 1Transplantation Unit, Massachusetts General Hospital, Boston, MA; 2Trasnplant Biology Research Center, MGH, Charlestown, MA; 3Bone Marrow Transplant Unit, MGH, Boston, MA; 4Pathology, MGH, Boston, MA; 5this Study was Performed in Partnership with Immune Tolerance Network. BACKGROUND: Induction of allograft tolerance has been the ultimate goal in organ transplantation. METHODS: Five subjects with ESRD received combined kidney and bone marrow transplantation (CKBMT) from HLA mismatched donors. The preparative regimen consisted of cyclophosphamide, thymic irradiation, anti-CD2 mAb and a 9-14 months course of a calcineurin inhibitor. Two subjects also received two doses of antiCD20 mAb prior to transplant. RESULTS: All recipients developed transient mixed chimerism without GVHD.Complete withdrawal of immunosuppressive medication was achieved in 4/5 recipients with current immunosuppression-free survival exceeding 3.2, 2.5, 1.1 and 0.2 years. A recipient rejected his kidney allograft on day 10. (1) The most recent creatinine/GFR of these 4 subjects were 1.2/61, 1.6/75, 1.6/96 (by renogram), 1.8/71 ml/min, respectively. (2)Although Subjects 2 and 5 initially developed anti-donor antibodies (ADA), both recipients lost ADA by 10th and 3rd month, respectively. Subject 4 developed post-transplant de novo anti-class II ADA one month after discontinuation of his immunosuppression, but without any functional derangements. (3) Subjects 1, 2 and 4 showed donor specifi c hyporesponsiveness in CML and MLR after nine months. (4) Allograft biopsies taken at 3 years from Subjects 1 and 2 revealed normal glomerulus, no tubulitis and no vasculopathy by light and electron microscopic examination with no C4d staining. Biopsy taken at 1.5 years from Subject 4 showed positive C4d deposition with no changes diagnostic of rejection. A most recent biopsy taken from Subject 5 on day 243 showed no rejection. (5) In Subject 1, extensive warts due to human polyoma virus existed before transplantation, but it disappeared after discontinuation of immunosuppression. All four patients show no hypertension, no DM, no abnormal lipid profi les. CONCLUSIONS: Renal allograft function of CKBMT recipients has been stable up to 3 years after complete withdrawal of their immunosuppression. Abstract# 3 A Novel Human Anti-CD40 Monoclonal Antibody, 4D11, for Kidney Transplantation in Cynomolgus Monkeys, Effect of Induction and Maintenance Therapy. Takeshi Aoyagi,1 Tomomi Suzuki,1 Atsushi Sugitani,2 Atsushi Imai,1 Motohiro Uno,1 Ryoichi Goto,1 Kenichiro Yamashita,1 Toru Miura,3 Nobuaki Takahashi,3 Tomoo Itoh,4 Hiroyuki Furukawa,1 Satoru Todo.1 11st Dept of Surgery, Hokkaido Univ., Sapporo, Hokkaido, Japan; 21st Dept of Surgery, Kyusyu Univ., Hakata, Fukuoka, Japan; 3Kirin Brewery Co., Ltd, Takasaki, Gunma, Japan; 4Dept of Surgical Pathology, Hokkaido Univ. Hospital, Sapporo, Hokkaido, Japan. Background/Aim: We have previously demonstrated that a novel human anti-CD40 monoclonal antibody (mAb), 4D11, markedly prolongs renal allograft survival in cynomolgus monkeys. In this study, we evaluated the effect of induction and maintenance therapy using 4D11. Methods: Twenty-four monkey renal transplants were divided into three groups: no treatment (Control), induction (Group A) and maintenance (Group B) treatments. Groups A and B were further subdivided according to the dose of 4D11 (n=3 each). The 4D11 was given intravenously on days 0, 4, 7, 11 and 14 for the induction therapy. In the group B, a half of the initial dose was given weekly thereafter until day 180. Graft survival, graft histology, anti-4D11 and anti-donor antibodies were examined. Results: Treatment Group 4D11 (mg/kg) Graft survival (days) Mean (days) Cause of death No treatment Control 5, 6, 7 6.0 AR, AR, AR Induction A-I 5 >96, 79, 75 83.3 Alive, AR, AR A-II 10 >200, 107, 92 133.0 Alive, CAN, AR A-III 20 169, 105, 90 121.3 AR, AR, AR Maintenance B-I 1 80, 79, 10 56.3 AR, AR, AR B-II 5 >202, 98, 44 114.3 Alive, AR, AR B-III 10 374, 253, 27 218.3 AR, AR, UTI B-IV 20 216, 169, 153 179.3 CAN, AR, CAN AR: Acute rejection, CAN: Chronic allograft nephropathy, UTI: Urinary tract infection No adverse events were observed. Graft survival was markedly prolonged by the induction treatment, which was further extended by the maintenance treatment. While graft biopsies revealed grade II or III rejection in the control, majority of those from groups A and B at 1 month post-transplantation showed only a borderline change. Anti 4D11-Ab was detected only in group A-III after drug cessation. In addition, animals receiving induction treatment and those given maintenance treatment with high doses of 4D11 did not develop anti-donor Ab unless the treatment was discontinued. Conclusion: 4D11 exhibited potent immunosuppressive effect on renal allograft survival both by induction and maintenance treatments. Besides, anti-drug and anti-donor antibody productions were effectively suppressed by 4D11. Abstract# 4 Pre-Transplant (Tx) Donor-Specifi c B Cells in Highly Sensitized Patients (HS), Detected by Intracellular Cytokine Flow Cytometry (CFC) Predict Antibody Mediated Rejection (AMR). Mieko Toyoda,1 Andy Pao,1 Ashley Vo,1 Marina Lukovsky,1 Raju Radha,1 Tetsu Sado,1 Lara Baden,1 Anna Petrosyan,1 Stanley C. Jordan.1 1Transplant Immunology Laboratory and Comprehensive Transplant Center, Cedars-Sinai Medical Center, Los Angeles, CA. Background: Intravenous immunoglobulin treatment (IVIG-Rx) reduces panel reactive antibodies and crossmatch (CMX) positivity, facilitating CMX(-) kidney Tx in HS. However, high rates of allograft rejec