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International Journal of Surgery Research and Practice

Current Aspects of ABO-Incompatible Liver Transplantation

Naoki Kawagishi1*, Noriaki Ohuchi1 and Susumu Satomi2

1Division of Transplantation, Reconstruction, and Endoscopic Surgery, Tohoku University Hospital, Japan
2Tohoku University, Japan

*Corresponding author: Naoki Kawagishi, Division of Transplantation, Reconstruction, and Endoscopic Surgery, Tohoku University Hospital, 1-1 Seiryou-machi, Aoba-ku, Sendai 980-8574, Japan, Tel: +81-22-717-7214, Fax: +81-22-717-7217, E-mail:
Int J Surg Res Pract, IJSRP-2-033, (Volume 2, Issue 3), Review Article; ISSN: 2378-3397
Received: August 29, 2015: Accepted: December 21, 2015: Published: December 23, 2015
Citation: Kawagishi N, Ohuchi N, Satomi S (2015) Current Aspects of ABO-Incompatible Liver Transplantation. Int J Surg Res Pract 2:033
Copyright: © 2015 Kawagishi N, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Liver transplantation is well recognized as treatment for patients with end-stage liver disease. Although the source of donors is limited, ABO blood type matched transplantation is commonly performed in deceased donor liver transplantation. On the other hand, where deceased donors are rarely available, a graft obtained from a family member of the recipient is mainly employed and thus ABO-incompatible (ABO-I) living donor liver transplantation (LDLT) becomes unavoidable. This review article describes the history and current aspects of ABO-I liver transplantation including our own Japanese experience. The main target of overcoming the ABO incompatibility is prevention, diagnosis, and treatment of antibody mediated rejection (AMR). To prevent AMR, plasma exchange (PE) was historically performed followed by local infusion therapy of rituximab, and intravenous immunoglobulin infusion (IVIG). To establish the diagnosis, histopathological findings of biopsy specimens are crucial, but peripheral serum antibody titers for the ABO blood type are helpful. Conventional anti-rejection rescue therapy such as steroid bolus is not enough to treat AMR, thus PE and rituximab should be added. Nevertheless, once AMR is triggered, most of the recipients will end up with graft necrosis within three weeks following transplantation. In recent years, owing to advances in the prevention and treatment of AMR after ABO-I therapeutic interventions, short- and even long-term survival of the ABO-I LT is guaranteed. However, ABO-I LT still presents with multiple severe complications that require further research in terms of immune modulation and control of infection.


Liver transplantation, ABO-incompatible, Plasma exchange, Infusion therapy, Living donor, Rituximab, Antibody mediated rejection


Blood-group type matching has been well-known as the principal rule in organ transplantation. However, as the possibility of obtaining grafts from living donors is very low, adjustment of blood type is sometimes very difficult. On the other hand, and particularly in Far East countries, it is even harder to obtain grafts from deceased donors; thus, living donors must be used for the rescue of patients with end-stage liver disease. In Japan, this background has led to an increase of ABO-incompatible (ABO-I) living donor transplantation, especially in the field of kidney transplantation. Although various therapeutic modalities emerged from the experience with renal transplantation, further adjusting strategies are required for the success of ABO-I liver transplantation [1]. Moreover, the hurdle posed by ABO-I liver transplantation is higher than that in kidney transplantation. This review describes the current advances of ABO-I liver transplantation including the achievements fruit of our predecessors' efforts, and a proposal to improve outcomes and reduce ABO incompatibility related complications in liver transplantation.

Milestones of ABO-Incompatible Liver Transplantation

Although ABO-incompatible renal and liver transplants have been widely performed in Japan, the number of patients benefitting by them gradually and steadily increased after the developments reported by Alexandre et al. in 1985 [2]. Particularly, in the field of liver transplantation, survival of recipients was poor in the early times, and the procedure was performed in few selected cases. In emergency situations, when given no choice but to proceed using the first available organ, ABO-I liver transplantation was not considered as a contraindication. In the 1980's Gordon et al. [3] reviewed 671 first, second, and third orthotopic liver allografts in 520 patients to determine the effect of donor-recipient mismatch or incompatibility for ABO blood group on graft survival. They found a significant advantage for ABO donor-recipient identity, especially in adults and for first grafts. However, a surprisingly large number of ABO incompatible grafts had been successful. So they recommended that non-identical or incompatible grafts be limited to patients such as small children for whom the supply of available donors is severely limited or for patients in urgent need of transplantation or retransplantation [3]. In the late 1980s', Gugenhein et al. [4] found in a study of 234 liver transplants that the 2-year graft survival for ABO-compatible elective (80%) or emergency (76%) liver transplants was significantly higher than that for ABO-incompatible emergency liver transplants (30%). The low survival of ABO-incompatible liver allografts was therefore not related to the emergency conditions. Among 17 patients who received ABO-incompatible liver allografts, six developed primary antibody mediated rejection, with hemorrhagic infiltration of portal tracts and deposition of IgM and fibrinogen on sinusoidal and endothelial cells. Other disadvantages of ABO-incompatible liver allografts were significantly higher frequencies of severe rejection crises, arterial thrombosis, and cholangitis. However, the 1-year survival rate of the patients who received ABO-incompatible grafts was 66%, so the use of ABO-incompatible liver grafts is justifiable in emergencies, when no other donor is available; such transplants may help to save the patient, even at the cost of retransplantation in half of the cases [4]. The turning point of ABO-I living donor liver transplantation (ABO-I LDLT) was in the 2000's when Tanabe et al. reported the case of two adult patients who had undergone ABO-I LDLT [5]. The anti-rejection therapy included multiple perioperative plasmapheresis, splenectomy, systemic triple immunosuppressive regimen with tacrolimus, methylprednisolone, and cyclophophamide or azathioprine. In addition to these conventional approaches, they performed intraportal infusion therapy with methylprednisolone, prostaglandin E1, and gabexate mesilate after transplantation. With their protocol, anti-donor blood group antibody titers remained low without any evidence of rejection or vascular complications throughout the postoperative course in both patients. Besides, biliary complications were transient and resolved completely. The second innovation was introduced by a Kyoto group of specialists [6]. The immunosuppressive therapy included multiple perioperative plasmapheresis, splenectomy, and treatment with tacrolimus, methylprednisolone, and cyclophosphamide. The dose and blood level of tacrolimus were the same as in ABO-compatible cases. In addition to these therapies, they introduced the administration of intrahepatic arterial infusion of prostaglandin (PG) E1 alone to the armamentarium. After perioperative plasmapheresis and administration of cyclophosphamide, anti-donor blood group antibody titers remained undiluted and there were no vascular complications throughout the postoperative course. The authors concluded that intrahepatic artery infusion of PGE1 was useful in adult ABO-I liver transplantation. The third innovation was use of rituximab. This new strategy for ABO-I LDLT has been adopted based on the experience with rituximab in kidney transplant recipients [7]. Rituximab is a monoclonal chimeric human-murine anti-CD20 antibody that depletes B cells by complement-dependent cytotoxicity, drug-induced apoptotic death, and antibody-dependent cellular cytotoxicity. Rituximab has been approved for the treatment of relapsed or refractory B-cell non-Hodgkin's lymphoma. Monteiro et al. reported the first case of rituximab use in a 15-year-old boy subjected to emergency ABO-I deceased donor liver transplantation [8]. We first use rituximab in LDLT recipients in 2002 [9], and reported the successful treatment of rejection episodes in a patient who had not responded to other forms of treatment. Some other reports also supported the effectiveness of the rituximab against antibody-mediated rejection [10] (Table 1).

Table 1: Milestones ABO-I liver transplantation. Improvements of immunosuppressive protocol. View Table 1

Mechanism of ABO Blood Type Related Rejection

In ABO-I organ transplantation, it is believed that early graft failure is caused by a series of responses triggered by antigen-antibody reactions between donor blood antigens on the graft and the corresponding antibodies in the recipient's serum [11]. The main reason for a poor result is severe hyperacute rejection due to anti-donor ABO antibodies during the early postoperative period. Once anti-blood type antibodies attach to the blood type antigens on the vascular endothelial cells, this causes damage to the endothelial cells. This phenomenon continues to develop with the production of substances such as cytokines, chemotactic factors, and free radicals, and is accompanied by platelet and complement activation, thrombus formation, granulocyte and macrophage migration, and phagocytosis by granulocytes and macrophages. Moreover, it was reported that the other complications of ABO-I LT, such as hepatic necrosis and intrahepatic biliary complications, were closely related to a high perioperative anti-A or anti-B Ab titers [12]. Thus, most of the efforts to improve the outcome of ABO-I liver transplantation have been directed toward the elimination of anti-blood type antibodies. Particularly, the impact of preformed anti-donor ABO antibodies and the strategy to reduce their titers play key roles in the success of pediatric ABO-I LDLT [13-15].

Apparently the micro-quantities of anti-A and anti-B antibodies within the blood are adsorbed by endothelial cells in hepatic blood vessels, causing a decrease of the serum antibody titer to zero at approximately several days after transplantation. It is also possible that reperfusion injury from the reinitiation of blood flow encourages endothelial cell damage. Thus, in some cases, localized subclinical rejection may develop and then be reversed mainly by fibrinolysis, resulting in graft survival [16]. During this time, there is no remarkable elevation of serum antibody titer as long as the antibodies are adsorbed within the liver. However, from a pathophysiological perspective, in cases of acute rejection antibody mediated rejection is accompanied by cellular rejection, especially within the first three weeks. Graft loss during this period always involves antibody mediated rejection.

Then, why do grafts survive following ABO-incompatible liver transplantation? If we examine surviving grafts, we see that even though ABO blood group antigens are present on the vascular endothelial cells within the graft and even though the recipient's blood contains anti-A/anti-B antibodies, no antibody mediated rejection occurs. In the field of kidney transplantation, this conundrum has been researched aggressively. Some patients with ABO-incompatible kidney grafts have been found within 1 year transplantation to be positive for C4d and have detectable titers of antibody without evidence of graft injury. Resistance to antibody-mediated injury has been observed in a number of experimental and human ABO-incompatible or cross match positive allografts, a condition termed 'accommodation' implying that the endothelium has developed resistance to antibody-mediated injury. However, Fidler et al. [17] reported C4d deposition with histologic abnormalities in 15 of 127 protocol biopsies from 32 ABO-incompatible allografts, suggesting that accommodation in the presence of anti-ABO antibodies is not often complete. Further studies are needed to determine whether true accommodation occurs, or whether the presence of such antibodies in the absence of classical histologic changes simply reflects subtle allograft injury over a long time frame [18].

Recent Strategies for ABO-I Liver Transplantation

The outcome of the ABO-I liver transplantation relies on the handling of anti-ABO antibodies during the perioperative period. Thus, there have been many trials and errors regarding the routine immunosuppressive protocol. In addition to the regimen used for kidneys, a different approach including periodical steroid pulsing and the use of anti-T lymphocyte antibody was tested. However, these methods not only failed to inhibit liver necrosis and intrahepatic bile duct injury, but also increased the risk of serious infections [11]. Success was reported sporadically, but reproducibility was poor. As a result, no gold standard protocol for the ABO-I liver transplantation was established until the end of the 1990's.


Rituximab has been approved for the treatment of relapsed or refractory B-cell non-Hodgkin's lymphoma, and autoimmune diseases [19]. It was first used in clinical transplantation in 2002 in Japan in a 22 year-old renal transplant recipient [20]. Since then, rituximab has been adopted based on the experience with rituximab in kidney transplant recipients [7]. As for liver transplantation, Monterio et al. reported the first case of rituximab use in 2003 [8].

Rituximab is a monoclonal chimeric human-murine anti-CD20 antibody that depletes the B cells by complement-dependent cytotoxicity, drug-induced apoptotic death, and antibody-dependent cellular cytotoxicity. We had good results in children without using rituximab before 2000, but we changed the strategy for ABO-I cases after we experienced a fatal case of antibody mediated rejection in 2000. Namely, we first reported the use of rituximab in LDLT recipients in 2005 [9], and described the successful treatment of rejection episodes in a patient who had not responded to other forms of treatment. Some other reports also supported the effectiveness of rituximab against antibody mediated rejection [10]. Recently, Egawa et al. reported the recommended timing and doses of rituximab for ABO-I LDLT recipients (U). Early administration of rituximab had no significant impact on antibody mediated rejection incidence or patient survival according to the Japanese registry, although at many centers rituximab is administered from 7 to 15 days preoperatively [21,22]. Rituximab was approved for resistant B-cell lymphoma at a dose of 375 mg/m2 weekly for 4 weeks. To deplete normal B cells in an ABO-I recipient, a single dose of rituximab is considered enough. In a recent search of the Japanese registry, it was found that half of the patients were given 500 mg/body, a quarter were given 300 mg/body and the rest were given 375 mg/m2. And there was a tendency toward a higher incidence of antibody mediated rejection in patients administered less than 300 mg/body compared with 500 mg/body or 375 mg/m2. Dose reduction of rituximab could derive in an increase of potential adverse effects in patients with end-stage liver disease, the same as in kidney transplantation; thus, more evidence is needed before recommending dose reduction. The incidence of adverse effects of rituximab was 1.6%; all recipients recovered and underwent LDLT [23]. Rituximab prophylaxis was tolerated by recipients with end-stage liver diseases. The incidence of bacterial infections and CMV disease after LDLT were similar between the non-rituximab and rituximab groups, but the incidence of fungal infection was significantly lower in the rituximab group. Lower amounts of conventional immunosuppressants might be a reason for the lower occurrence of fungal infections. Anyway, the introduction of rituximab significantly improved the outcome of adult ABO-I LDLT.

Local infusion therapy

In 1998, a Keio University group of researchers developed an anti-rejection regimen administered by portal vein infusion [5]. Their protocol included multiple perioperative plasma exchange, splenectomy, and a systemic triple immunosuppressive regimen consisting of tacrolimus, methylprednisolone, and cyclophosphamide or amathioprine. In addition to these conventional regimens, they introduced portal vein infusion therapy. They considered that local prophylactic therapy might be more effective and favorable than systemic therapy. The target of this therapy is to control local intravascular coagulation in the graft. Prostaglandin E1, gabexate mesylate and methylprednisolone are infused through the catheter. Prostaglandin E1 improves hepatic blood flow and the microcirculation through its vasodilating effects and inhibits platelet/leukocyte adhesion. Gabexate mesylate is a serine protease inhibitor that inhibits thrombin, Xa, and platelet aggregation. Methylprednisolone has a wide spectrum of anti-inflammatory and immunosuppressive effects. One concern was that portal vein thrombosis increased when portal vein infusion was combined with splenectomy, due to thrombocytosis and decreased splenic vein flow. But the Keio group suggested that the catheter should be inserted from middle colic vein, and the tip of the catheter should be placed peripheral to the superior mesenteric vein [11]. This catheter placement is optimal for a safe and effective therapy.

Another local infusion therapy emerged from Kyoto group [6]. The immunosuppressive therapy included multiple perioperative plasmapheresis, splenectomy, and treatment with tacrolimus, methylprednisolone, and cyclophosphamide. The dose and blood level of tacrolimus were the same as in ABO-compatible cases. In addition to these therapies, they administered an intrahepatic arterial infusion with prostaglandin (PG) E1 alone. The catheter was placed through one of the branches of the hepatic artery after anastomosis. This protocol improved the 1-year survival after ABO-I LDLT to 85%, and decreased the frequency of portal vein thrombosis [24]. However, severe bleeding could occur if the catheter dislocates, either spontaneously or during its removal. Retrospective review of the Japanese national registry has shown that graft survival is not significantly different whether hepatic artery or portal vein infusion therapy is used. Both treatments were collectively designed as "local infusion therapy", and this markedly improved the outcome of the ABO-I LDLT. Local infusion therapy contributed to increase the 2-year adult recipient survival rates after ABOI-LDLT in Japan from around 60% to 80% since 2005 (Figure 1).

Figure 1: Patient survival curve on ABO-I LDLT patients 16 year-old or older in Japan. The introduction of rituximab and infusion therapy has yielded excellent results after ABO-incompatible LDLT even in adults. Infusion therapy was introduced since 1998, and rituximab was introduced since 2002. Current 2-year patient survival in ABO-compatible LDLT in Japan is around 80%. (Japan Study Group for ABO Blood Type Incompatible Transplantation 2013). View Figure 1


Plasma exchange

In general, approximately 3000-4000 ml of plasma will be processed during a single plasma exchange session, allowing the removal of 50-60% of the IgG or IgM fraction [16]. It is thus safe to assume that the anti-A/anti-B antibody removal rate is approximately 50% for a single plasma exchange session. Type AB plasma, which contains neither anti-A nor anti-B antibodies, is thus used as the replacement fluid. However, type AB plasma can contain soluble antigens of types A and B, along with antibodies of unknown immunoreactivity that can act as antigens upon transfusion into the recipient and thus result in an elevated antibody titer.

The presence of anti-A and/or -B antibodies in the recipient and the wide expression of these antigens on endothelial cells, as well as on a variety of parenchymal epithelial cells in the graft, are indeed risks for antibody mediated rejection. The impact of anti-donor ABO antibodies and the strategy to reduce their titers play key roles in the success of this transplantation. In our institute, a recipient whose titer of IgM or IgG is equal to or greater than 16 is subjected to plasma exchange before transplantation. Plasma exchange is performed 3 or more times until the titer of the antibody becomes equal to or less than 8 [14]. If the titer increases in the early postoperative period, most of the cases suffer antibody mediated rejection. Plasma exchange is useful to decrease the titer temporarily, but we can never controls the ABO-I related antibody mediated rejection using only PE.


The spleen is a major site of antibody production. Thus, splenectomy has been performed in both renal and liver ABO-I transplantations. Some research groups [25-27] reported that splenectomy is needed because of the following reasons: a) splenectomy is expected to eradicate remnant antibody-producing plasma cells that cannot be eliminated by rituximab and plasma exchange; b) splenectomy can significantly reduce excessive portal vein flow, which is critical for small-for-size graft; c) thrombocytopenia or severe splenomegaly affects the quality of life; and d) portal vein infusion therapy with splenectomy and a triple-agent immunosuppression regimen consisting of tacrolimus, steroids, and cyclophosphamide or mycophenolate mofetil is the most effective regime. However, these days, the clinical significance of splenectomy has become a matter of controversy. The spleen represents only around a quarter of the peripheral lymphoid tissue, and splenectomy compromises the immune response because the recipient is deprived of the other immune functions of the spleen and is at an increased risk of infections [24]. The Kyoto group recently reported that there was no statistically significant difference in anti-ABO immunoglobulin M and immunoglobulin G antibody titers between the "splenectomy" and "nonsplenectomy" groups during the initial 8 weeks [28]. And the clinical outcomes, including antibody mediated rejection, biliary complications, infections, and survival, were similar in both groups. In our experience, the threshold to perform splenectomy is not so high, and its reliability regarding reduction of antibodies is certainly expected, we continue to perform splenctomy so far.

Intravenous immunoglobulin

Another strategy for ABO-I LDLT is intravenous administration of high-dose IgG (IVIG). The proposed mechanisms include: blockade of Fc receptors on mononuclear phagocytes, direct neutralization of allo-antibodies, inhibition of CD19 expression on activated B cells, inhibition of complement and inhibition of alloreactive T cells [29]. But in Japan the number of ABO-I LDLT recipients who undergo IVIG therapy is limited. A Kyushu group of researchers reported that three of their four patients with liver cirrhosis received rituximab over 3 weeks before LDLT, followed by PEs and post-LDLT IVIG, resulting in no rebound of isoagglutinin titers. The remaining patient, with fulminant hepatitis, received rituximab 3 days before LDLT, resulting in antibody-mediated rejection, successfully treated by IVIG and PE [30].

Other considerations

Blood adsorption and immunoadsorption:BiosynsorbR is an adsorption agent for anti-A and anti-B antibodies in which the determining group, similar to erythrocyte type antigen, is chemically synthesized and bound to silica gel beads. The effects of BiosynsorbR were demonstrated by Bensinger [31] in 1981. BiosynsorbR is capable of reducing antibody titer to 1/4-1/8 the pretransplant level in a single treatment of 3000-4000 of plasma. In contrast to total plasma exchange, immunoadsorption requires almost no use of exchange fluid. The cost of the device may be argued.

Histopathology:Unlike acute cellular or chronic rejection, the diagnosis of antibody mediated rejection in liver allografts is often difficult to establish. However, the early and distinguished histopathological diagnosis of antibody mediated rejection is crucial for the management of ABO-I liver transplantation. The Kyoto group recently reported that among ABO-I liver transplant recipients, complement component 4d (C4d) positivity was not associated with allograft dysfunction or fibrosis [32]. On the contrary, C4d endothelial positivity among ABO compatible recipients was an uncommon event that could be associated with chronic graft damage with or without clinical antibody mediated rejection. We hope for further progress on histopathological diagnosis.

Long-term perspective:Long-term outcomes of pediatric ABO-I LDLT are not significantly different from ABO compatible cases [33]. Similarly, the survival of living donor kidney series of ABO-incompatible recipients, including adults, in Japan, showed no differences compared with ABO-compatible transplants. This showed that the influence of blood type-related immunological factors was almost eliminated once accommodation is established in the recipient of living donor kidney transplant. In most of the cases, the antibody titers became low in long-surviving kidney transplant recipients [34]. We hope that the same will happen to adult recipients of LT, but it takes more time to show the results. Besides, it might be possible that these advanced immunosuppressive protocols for ABO-I LT are adopted for other organ transplantations in the future.


Rituximab and local infusion therapy is being used in ABO-incompatible LDLT in Japan with good and promising results. The use of rituximab and local infusion therapy are new useful strategies for ABO-incompatible liver transplantation developed in Japan. Similar to those recipients who were subjected to ABO-I LDLT during their childhood without receiving rituximab or infusion therapy and are spending their lives like ABO-compatible or -identical recipients, many adults who received rituximab or infusion therapy are also spending normal daily lives. Finally, in terms of long-term outcome, survival after ABO-incompatible LDLT can be expected to proceed without severe complications if perioperative complications such as antibody-mediated rejection are overcome.

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