Prevention and treatment of recurrent Hepatitis B after liver transplantation: the current role of nucleoside and nucleotide analogues
© Schreibman and Schiff; licensee BioMed Central Ltd. 2006
Received: 25 February 2006
Accepted: 06 April 2006
Published: 06 April 2006
The Hepatitis B virus (HBV) is a DNA virus that can cause both acute and chronic liver disease in humans. Approximately 350–400 million people are affected worldwide and up to one million deaths occur annually from cirrhosis and hepatocellular carcinoma. When cirrhosis and liver failure develop, the definitive treatment of choice remains orthotopic liver transplantation (OLT). In the past, an unacceptable HBV recurrence rate with a high rate of graft loss was noted. The use of Hepatitis B immunoglobulin (HBIG) has resulted in improved patient and graft survival rates. The addition of the nucleoside analog Lamivudine (LAM) to HBIG has improved these survival curves to an even greater degree. Prolonged use of LAM will almost invariably lead to the development of viral mutations resistant to the drug. There are now several other nucleoside and nucleotide analogs (Adefovir, Entecavir, Tenofovir, and Truvada) available for the clinician to utilize against these resistant strains. It should be possible to prevent recurrence in most, if not all, post-transplant patients and also to significantly reduce viral loads with normalization of transaminases in those who have developed recurrent infection. The antiviral regimen should be robust and minimize the risk of breakthrough mutations. A prudent approach may be the implication of combination antiviral therapy. This review summarizes the efficacy of previous regimens utilized to prevent and treat recurrent HBV following OLT. Particular attention will be paid to the newer nucleoside and nucleotide analogs and the direction for future strategies to treat HBV in the post transplant setting.
The Hepatitis B virus (HBV) is a DNA virus that can cause both acute and chronic liver disease in humans. Approximately 350–400 million people are affected worldwide and up to one million deaths occur annually from cirrhosis and hepatocellular carcinoma. [1, 2] The use of nucleoside analogs has been shown to prevent liver failure as well as prolonging transplant free survival in patients with chronic hepatitis. [3–7] However, if cirrhosis and liver failure develops, the definitive treatment of choice remains orthotopic liver transplantation (OLT). The current estimates suggest that 5–10% of liver transplants performed in the United States are for HBV disease.  An unacceptable recurrence rate with an extremely high rate of graft loss was noted initially and HBV infection was actually considered to be a relative contraindication to OLT. [9–11] Fortunately, the use of HBIG resulted in markedly improved patient and graft survival rates. The addition of the nucleoside analog Lamivudine (LAM) to Hepatitis B Immunoglobulin (HBIG) has improved these survival curves to an even greater degree (greater than 80% five year survival rate) while also enabling the treatment team to consider discontinuation of the costly HBIG preparation. 
In the pre-transplant setting prolonged use of LAM will almost invariably lead to the development of viral mutations resistant to the drug. Furthermore, prolonged therapy with LAM in the post-transplant setting could also lead to the development of LAM-resistant mutants. Indeed, there have now been several reports of these mutations developing following OLT. [13–22] This raises the question of how to treat these LAM-resistant patients in the post-transplant period. Fortunately, there are other nucleoside and nucleotide analogs (Adefovir, Entecavir, Tenofovir, and Truvada) available now or in the near future for the clinician.
It should be possible to prevent recurrence in most, if not all, post-transplant patients and also to significantly reduce viral loads with normalization of transaminases in those who have developed recurrent infection. The antiviral regimen should be robust and minimize the risk of breakthrough mutations. A prudent approach may be the implication of combination antiviral therapy.
The purpose of this review is to summarize the efficacy of previous regimens utilized to treat recurrent HBV following OLT. Particular attention will be paid to the newer nucleoside and nucleotide analogs and the direction for future strategies to treat HBV in the post transplant setting.
Prevention of HBV recurrence
Hepatitis B Immunoglobulin (HBIG)
HBIG first became available for use in 1975. This agent provides a means of passive immunity for the patient. In principle, polyvalent anti-HBs antibodies will bind to and neutralize circulating virions and prevent subsequent graft infection. Anti-HBs also undergoes endocytosis by hepatocytes and binds to HBsAg within cells already infected, thereby decreasing HBsAg secretion. The first large study demonstrating the efficacy of long term HBIG came from the EUROHEP study group in 1993. Three hundred seventy-two patients transplanted for HBV-related liver failure were observed. The risk of HBV recurrence was 75 ± 6% among the 67 patients given no immunoprophylaxis, 74 ± 5 percent among the 83 treated for two months, and 36 ± 4 percent among the 209 treated for six months or longer (P < 0.001). Improved patient survival (75 versus 45 percent) at three years was also noted among those patients receiving passive prophylaxis with HBIG. Multivariate analysis revealed that long-term administration of HBIG was associated with a relative risk reduction of 3.3 for the development of recurrent HBV.  These findings have now been confirmed in multiple studies and the median rate of recurrent HBV in patients receiving long-term HBIG is approximately 20% over one to two years. [24–33]
There are several drawbacks to the use of HBIG. First is its cost. Most regimens currently in use in the United States range from $80,000 to $200,000 for the first year. These costs also include the cumbersome IV infusion sets and monitoring of the patient during administration.  The supply of HBIG is limited. Significant side effects have been noted with the infusion including headaches, flushing and chest pain. . Lastly, the development of escape mutants can be seen reducing the efficacy of HBIG. These escape mutants are typically due to mutation in the HBsAg at the "a" determinant loop.  The trend has been toward lower doses given intramuscularly.
In the past, the use of monoclonal antibody to the HBV surface antigen led to an unacceptable rate of breakthrough infections. [35, 36] However, a recent study by Galun et. al.  showed promising results using a mixture of two monoclonal antibodies in a phase I clinical study. Patients developed a rapid and significant decrease in HBV-DNA levels. Future studies are warranted, but this preliminary data suggests that monoclonal antibody preparations could replace the current polyclonal HBIG.
Lamivudine (LAM) was the first nucleoside analog to be approved for the use of chronic HBV. Its mechanism of action is the inhibition of the DNA polymerase of the virus and suppression of HBV replication. [38, 39] LAM has also been shown to be safe in patients with decompensated liver disease; it is well tolerated and achieves a rapid loss of HBV DNA in the serum. LAM is preferred over the use of the Interferons which are contraindicated in patients with advanced cirrhosis. [3–7]
In the pre-transplant setting, the drug has been shown to be potent. Undetectable HBV DNA can be achieved in most patients within 2–3 months. [3, 6, 7, 13, 40–47]. Furthermore, histologic improvement may be seen in 49–56% of patients after receiving one year of therapy. [34, 48–51] Yao showed that the use of LAM could also improve the Child-Pugh-Turcotte (CPT) score by more than or equal to three points in 60% of patients receiving the drug and even reduce the necessity for OLTx. 
The major drawback to the use of LAM is the development of resistance to the drug caused by mutations in the reverse transcriptase gene. The most common mutations occur in Domain C of the HBV polymerase at the tyrosine-methionine-aspartate-aspartate (YMDD) locus. Other mutations can occur at Domain B in conjunction with the YMDD mutations.  Liaw showed that the cumulative rates of LAM resistance were 14%, 38%, 49%, 66% and 69%, one, two, three, four, and five years after initial therapy respectively.  Other studies have showed similar rates of resistance with resistance rates of 24% and 70% after one and four years of therapy respectively. [50, 51, 54]
In an attempt to lower the cost, and avoid the side effects and cumbersome administration of HBIG, multiple studies have examined the use of LAM prior to and following transplant to prevent HBV recurrence. Perillo et. al. conducted the largest multicenter study in North America in which 77 liver transplant candidates were treated with LAM (100 mg daily) without the adjunctive use of HBIG. Treatment was initiated prior to and after transplantation. Forty-seven eventually underwent liver transplantation. Re-infection with HBV occurred at a rate of 40% over the subsequent three years and HBV-DNA polymerase mutants were detected in 15 (21%) of the transplanted patients.  Other studies with LAM monotherapy have also been disappointing with high rates of HBV recurrence ranging from 23–50% of patients. [41, 43, 55–57] The high rates of recurrence were due to the expected emergence of escape mutations in the YMDD locus. For this reason, LAM prophylactic monotherapy has been abandoned in favor of combination therapy with HBIG.
Lamivudine and Hepatitis B Immunoglobulin combination therapy
In contrast to monotherapy, LAM in combination with HBIG has been potent in preventing the recurrence of HBV in the post-transplant setting. Indeed, following the results of several studies, the standard of care has become administration of LAM in the pre-transplant setting (ideally, at least four weeks prior to transplantation) followed by the combination of LAM and HBIG in the post-transplant setting.  HBV recurrence rates are usually less than 10% one to two years following transplantation. Furthermore, HBV DNA levels by PCR are also typically undetectable. [13, 40, 42, 59–66]
These favorable response rates are likely secondary to the additive effects of LAM with the HBIG. Another added benefit of combination therapy is that HBIG can be administered in reduced amounts thus reducing costs and increasing availability of HBIG. [13, 40] Some have argued that HBIG could even be stopped at some point after transplantation. This issue represents an impending controversy that requires further investigation before a robust recommendation can be made, although our center often discontinues HBIG at some point following OLT depending upon the individual patient, serologic studies and viral load.
It is now well known that a significant number of patients can develop LAM resistant strains of HBV while receiving this drug in the pre-transplant setting. Furthermore, an increasing number of patients may become primarily infected with a LAM resistant HBV mutant. In this setting, the use of LAM for prevention of recurrent HBV in the post transplant setting is of limited value. Adefovir dipivoxil (ADV) is an orally available prodrug of Adefovir- a nucleotide analog of adenosine monophosphate that has been shown to have activity against both wild type and LAM-resistant HBV. Improvement in histology, LFT's and viral DNA levels have been seen with the use of this drug. [67–69]. The drug is very well tolerated and the only significant side effect is risk of increased nephrotoxicity after 20 or more weeks of use. 
Several large studies have shown the utility of ADV in the pre and post liver transplantation setting. The largest study by Schiff et. al. showed that among patients with LAM-resistant HBV and who were pre-OLT, 81% achieved undetectable serum HBV DNA. Furthermore, serum ALT, Albumin, bilirubin and prothrombin time normalized in 76%, 81%, 50% and 83% of these pre-OLT patients respectively. Furthermore, the Child-Pugh-Turcotte score improved in over 90% of cohorts. Unlike the use of LAM, no resistance to ADV was identified after 48 weeks of therapy in this population.  Many patients came off the transplant list because of reversal of the decompensated state.
Another study describing the use of prophylactic ADV was from Lo et. al. They describe 16 patients who had developed YMDD mutations while on the waiting list for OLT. Eleven patients received ADV for a median of 20 days (range 8–271 days) before transplantation while 5 patients started the drug at the time of OLT. The median follow-up period after OLT was 21.1 months (range 4.4–68.9 months). One patient died of a cause unrelated to HBV 12.2 months after transplantation. Fifteen patients (94%) were alive with the original graft. Pre-OLT HBV DNA levels at the time of breakthrough were available in 15 patients ranging from 2 × 103 – 4.69 × 109 copies/mL (median 1.42 × 107). Lo's cohort was divided in half: eight patients received HBIG (in addition to ADV and LAM) for a median of 24 months whereas the other 8 patients received prophylaxis with ADV and LAM alone. All 16 patients cleared the HBV DNA and had no evidence of recurrence; furthermore, all remained HBeAg negative. The graft survival was 94% at a median follow up of 21 months. Lo concludes that add-on ADV plus LAM should be the "preferred approach in those patients who have already developed resistance to lamivudine so as to avoid the emergence of multiresistant viral strains." 
Previous studies reported a low rate of ADV resistance- occurring in less than 2% of patients after 96 weeks. [66, 68, 73, 74] However, the emergence of ADV resistant HBV mutants is now considered to be clinically significant over time when given as monotherapy; resistance has been reported in 18% of patients after 4 years of therapy and 22% after 2 years of therapy. [75–77].
It is expected that the development of ADV mutations will similarly become a problem in the post-transplant setting. Villenueve recently reported the first case of a patient who developed sequential selection of LAM and ADV resistant strains of HBV in a liver transplantation patient.  The patient was a 52 year old Cambodian who was initially HBV DNA negative and HBsAg positive. He was given prophylactic HBIG alone in the peritransplant setting without any nucleoside analogs. Virologic breakthrough with LAM resistance mutations in L180M and M204V followed 20 months later. ADV was added to LAM and after reduction in DNA levels, LAM was discontinued and ADV was continued alone. A subsequent reversion to wild type took place. A second virologic breakthrough occurred after nearly two years of ADV monotherapy with the selection of the resistance mutation N236T of the D domain of the HBV polymerase.  Xiong et. al. had recently described this mutation in 2/124 patients receiving chronic ADV therapy for two years.  LAM was reintroduced with ADV after which the patient developed undetectable levels of the virus.
Both the Schiff and Lo study suggest that ADV provides safe and effective prophylaxis in those patients with LAM resistant HBV infection.
An area for future investigation is whether the use of ADV in combination with LAM should be utilized. There are several potential benefits with combination therapy. The chance for breakthrough mutations to either LAM or ADV is significantly less when the agents are used in combination. [72, 77, 78] Snow et. al. observed a patient population of 467 patients with LAM-resistant HBV. He reported that resistance to ADV was only seen in those who stopped LAM.  Fung et. al. studied all HBV patients in a tertiary care center receiving ADV. He found that none of the patients receiving combination therapy (LAM + ADV) developed ADV resistance; among those who had switched to ADV monotherapy after combination therapy, 5 of 18 patients (28%) developed resistance. 
Another potential benefit of combination therapy would be to eliminate the need for HBIG with its economic cost and potential toxic side effects (see discussion above). Note that in Lo's study, all eight patients who did not receive HBIG remained alive with normal chemistries at a median follow up of 15.1 months (range 4.4– 26). Furthermore, there was no histologic evidence of recurrence. Six of these eight had spontaneous HBsAg seroconversion. Although, two of the eight remained HBsAg positive, both had undetectable DNA levels with normal LFT's. The possibility of a viral breakthrough with resistance to both LAM and ADV should be low given the relatively low frequency of ADV resistance and lack of cross-resistance to LAM when given in combination.  The duration of HBIG therapy remains a contentious issue; to suggest its elimination altogether is controversial and worthy of further investigation.
Treatment of HBV recurrence
Prior to combination HBIG/LAM, graft infection was frequently seen. As described above, this was due to the high recurrence rates in patients who received HBIG or LAM as monotherapy alone or in those who received no prophylaxis at all. De Novo HBV is also seen in the post transplant setting. Fortunately, LAM is very effective in treating HBV infection of the graft and remains the first line agent. Perillo performed a large multicenter center of 52 HBV-DNA positive patients. After one year of treatment, LAM resulted in a 68% loss of HBV serum DNA with an 11% HBeAg seroconversion.  Other studies have shown similar improvements with HBV-DNA negativity ranging from 75 to 100%, although HBeAg serum conversion is generally less than 30%. [59, 80, 81] This low rate of serum conversion is consistent with prior reports in the non-transplanted population. 
Unfortunately, breakthrough is seen just as in the non-transplanted population in up to 50% of patients within the first one to two years following transplantation [59, 79–81]. It should be expected that with even longer follow up the development of LAM resistant mutants should approach 70%. Continuation of LAM for graft infection that develops while receiving prophylaxis with LAM ± HBIG is not indicated. Furthermore, the use of LAM as a primary treatment agent is ineffective for de novo graft infection with a LAM resistant mutant. In these scenarios, ADV should be initiated, although Tenofovir or Truvada may ultimately replace ADV pending future studies.
The use of Adefovir for the treatment of HBV graft infection
No of Patients
No patients DNA Pos
No patients HBeAg Pos
DNA Negative following Treatment
DNA Change Median
Development of Adefovir Resistant Mutants
24 months (one only received 9 months of therapy)
6– 48 months Median 30 months
Initial load not reported but became undetectable
2.45 billion to 32, 100
2000 and 17 pg/mL respectively to undetectable
ADV is thus both an effective and safe drug to treat graft infection and prevent clinical deterioration of patients affected with the development LAM resistant HBV graft de novo infection or for LAM-resistant breakthrough mutants. (See Table 1)
Neff's study  described a total of 14 patients who had the development of LAM resistant mutants. Nine patients were switched from LAM to ADV. The other 5 patients were treated with Tenofovir. Of the patients given ADV, one died during follow-up. Of the 8 alive, all but one had reductions in HBV DNA.
Toniutto's study  describes one patient who developed de novo HBV graft infection. 3 months after treatment of LAM, LAM resistance developed. The patient was given two months of ADV plus LAM with HBsAg seroconversion and undetectable HBV DNA levels. Therapy was stopped thereafter and the patient remains HBV negative 13 months later.
None of these studies and case reports described any significant nephrotoxicity with the use of ADV. In post-OLT patients, there are multiple factors, in particular the use of calcineurin inhibitors, that contribute to renal dysfunction. Some patients did develop a rise in serum creatinine which was easily treated with reduced frequency dosing of ADV.
Entecavir and Tenofovir
Although ADV is generally well tolerated, there does exist a risk of nephrotoxicity with this agent. Furthermore, as described above, there exists the possibility of N263T and other ADV resistant mutants. In these cases, it may be desirable to use either Tenofovir Disoproxil Fumarate or Entecavir.
Entecavir is a carboxylic analogue of guanosine and is the most recently FDA approved drug for the treatment of chronic Hepatitis B. Like Adefovir, it has been shown to be a potent antiviral agent for the wild type and LAM-resistant forms of chronic HBV. [84–86] It is expected that Entecavir will be efficacious in the prevention and treatment of recurrent HBV following liver transplantation. The first reports of Entecavir's use in this setting are now being reported. 
Tenofovir is currently only approved for use in HIV positive patients but has been to be effective for LAM resistant mutants and for those patients who have failed prior ADV and LAM. It is a nucleotide analogue and acts as a reverse transcriptase inhibitor. [88–90] Several case reports have now been reported in which Tenofovir produced a well tolerated, successful antiviral response in patients before and after OLT.
Taltavull describe a 54 year old male who developed YMDD mutations while receiving LAM therapy. ADV produced a suboptimal response: DNA levels were still positive after 8 months of therapy. His clinical status continued to decline with spontaneous bacterial peritonitis and worsening of CPT status. Tenofovir was then added and produced a rapid dramatic decline in DNA levels to undetectable levels 4 weeks after treatment. He continued on this treatment up to OLT after which time he received only HBIG, LAM and ADV.  The patient's outcome remained excellent 21 months following OLT.
In 2004, Neff et. al.  reported the successful use of Tenofovir in patients who developed the Lam resistance following OLT. From June, 1998 through December, 2003, 25 patients transplanted for HBV were managed on chronic LAM therapy. Sixteen patients (64%) developed resistance to LAM between 10–85 months (median 26) following OLT. Eight of these patients were administered Tenofovir at a dose of 300 mg/day 1–66 months after the development of resistance. Therapy was continued for 14–26 (median 19.3) months. All 8 patients experienced DNA suppression with 7 having undetectable viral loads. Creatinine clearance was not impaired nor was any other adverse event reported. Both the Taltavull and Neff study suggest that Tenofovir is a safe and effective therapy for those patients who develop LAM-resistant mutants after OLT. It also stands to reason that the use of Truvada (Emtricitabine and Tenofovir) will also be useful in this setting; although, like Tenofovir, it is not yet FDA approved for this use.
The Hepatitis B virus is a DNA virus that can cause both acute and chronic liver disease in humans. If cirrhosis and liver failure develops, the definitive treatment of choice remains orthotopic liver transplantation (OLT). In the past, recurrence of HBV was common following OLT- leading to unacceptable rates of graft loss and increased morbidity and mortality.
With the advent of new antiviral therapy, it should be possible to prevent recurrence in most, if not all, post-transplant patients. Ideally, the antiviral regimen should be robust and prevent breakthrough mutations. In decompensated cirrhotic patients, the use of combination therapy has the advantage of reducing the risk of escape mutations. A prudent approach in preventing recurrence may be the implication of combination antiviral therapy in the post-transplant setting as well. This remains an unanswered question. As discussed above, most studies using combination therapy have been small; although favorable results are seen.
Fortunately, for those who have already developed recurrent disease, newer agents, either alone or in combination, are able to achieve significant reductions in the HBV DNA level and normalization of transaminases.
A pending controversy is the duration of HBIG therapy. While the use of HBIG infusions is universally accepted as advantageous in the perioperative setting, the use of combination oral agents may make it possible to stop this costly therapy after a short period of time or avoid it entirely. This remains a contentious issue that requires further studies before a definitive recommendation can be made.
- Lee WM: Hepatitis B virus infection. N Engl J Med. 1997, 337: 1733-1745. 10.1056/NEJM199712113372406View ArticlePubMedGoogle Scholar
- Poland GA, Jacobson RM: Prevention of Hepatitis B with the Hepatitis B vaccine. N Engl J Med. 2004, 351: 2832-2838. 10.1056/NEJMcp041507View ArticlePubMedGoogle Scholar
- Villeneuve JP, Condrey LD, Willems B: Lamivudine treatment for decompensated cirrhosis resulting from chronic Hepatitis B. Hepatology. 2000, 31: 207-210. 10.1002/hep.510310130View ArticlePubMedGoogle Scholar
- Yao FY, Bass NM: Lamivudine treatment in patients with severely decompensated cirrhosis due to replicating hepatitis B infection. J Hepatol. 2000, 33: 301-307. 10.1016/S0168-8278(00)80371-2View ArticlePubMedGoogle Scholar
- Kapoor D, Guptan RC, Wakil SM: Beneficial effects of lamivudine in Hepatitis B virus-related decompensated cirrhosis. J Hepatol. 2000, 33: 308-312. 10.1016/S0168-8278(00)80372-4View ArticlePubMedGoogle Scholar
- Perillo RP, Wright T, Rakela J: A multicenter United States-Canadian trial to assess lamivudine monotherapy before and after transplantation for chronic Hepatitis B. Hepatology. 2001, 33: 424-432. 10.1053/jhep.2001.21554View ArticleGoogle Scholar
- Yao FY, Terrault NA, Freise C: Lamivudine treatment is beneficial in patients with severely decompensated cirrhosis and actively replicating Hepatitis B infection awaiting liver transplantation: A comparative study using a matched untreated cohort. Hepatology. 2001, 34: 411-416. 10.1053/jhep.2001.26512View ArticlePubMedGoogle Scholar
- Seaberg EC, Belle SH, Beringer KC: Liver transplantation in the United States from 1987–1998: Updated results from the Pitt-UNOS liver transplant registry. Clinical Transplants. Edited by: Cecka, JM, Terasaki, PI. 1998, UCLA Tissue Typing Laboratory: Los AngelesGoogle Scholar
- Todo S, Demetris AJ, Van Thiel D: Orthotopic liver transplantation for patients with Hepatitis B virus-related liver disease. Hepatology. 1991, 13: 619-626. 10.1016/0270-9139(91)92554-LPubMed CentralPubMedGoogle Scholar
- O'Grady JG, Smith HM, Davies SE: Hepatitis B virus reinfection after orthotopic liver transplantation. Serological and clinical implications. J Hepatol. 1992, 14: 104-111. 10.1016/0168-8278(92)90138-FView ArticlePubMedGoogle Scholar
- Davies SE, Portmann BC, O'Grady JG: Hepatic histological findings after transplantation for chronic Hepatitis B virus infection, including a unique pattern of fibrosing cholestatic hepatitis. Hepatology. 1991, 13: 150-157. 10.1016/0270-9139(91)90228-NView ArticlePubMedGoogle Scholar
- Papatheodoridis GV, Sevastianos V, Burroughs AK: Prevention of and treatment for Hepatitis B virus infection after liver transplantation in the nucleoside analogues era. Am J Transplant. 2003, 3: 250-258. 10.1034/j.1600-6143.2003.00063.xView ArticlePubMedGoogle Scholar
- Rosenau J, Bahr M, Tillmann HL: Lamivudine and low-dose Hepatitis B immune globulin for prophylaxis of Hepatitis B reinfection after liver transplantation: Possible role of mutation in the YMDD motif prior to transplantation as a risk factor for reinfection. J Hepatology. 2001, 34: 895-902. 10.1016/S0168-8278(01)00089-7.View ArticleGoogle Scholar
- Walsh KM, Woodall T, Lamy P: Successful treatment with adefovir dipivoxil in a patient with fibrosing cholestatic hepatitis and lamivudine resistant Hepatitis B virus. Gut. 2001, 49: 436-440. 10.1136/gut.49.3.436PubMed CentralView ArticlePubMedGoogle Scholar
- Mutimer D, Feraz-Neto BH, Harrison R: Acute liver graft failure due to emergence of lamivudine resistant Hepatitis B virus: Rapid resolution during treatment with adefovir. Gut. 2001, 49: 860-863. 10.1136/gut.49.6.860PubMed CentralView ArticlePubMedGoogle Scholar
- Wai C-T, Prabhakaran K, Wee A: Adefovir dipivoxil as the rescue therapy for lamivudine-resistant Hepatitis B post liver transplant. Transplantation Proceedings. 2004, 36: 2313-2314. 10.1016/j.transproceed.2004.06.047View ArticlePubMedGoogle Scholar
- Akay S, Karasu Z, Akyildiz M: Adefovir treatment in posttransplant Hepatitis B virus infection resistant to lamivudine plus Hepatitis B virus immunoglobulin. Transplantation Proceedings. 2004, 36: 2768-2770. 10.1016/j.transproceed.2004.09.062View ArticlePubMedGoogle Scholar
- Seehofer D, Rayes N, Steinmüller T: Occurrence and clinical outcome of lamivudine-resistant Hepatitis B infection after liver transplantation. Liver Transplantation. 2001, 7: 976-982. 10.1053/jlts.2001.28442View ArticlePubMedGoogle Scholar
- Neff GW, O'Brien CB, Nerry J: Outcomes in liver transplant recipients with Hepatitis B virus: Resistance and recurrence patterns from a large transplant center over the last decade. Liver Transplantation. 2004, 10: 1372-1378. 10.1002/lt.20277View ArticlePubMedGoogle Scholar
- Villeneuve JP, Durantel D, Durantel S: Selection of a Hepatitis B virus strain resistant to adefovir in a liver transplantation patient. J Hepatol. 2003, 39: 1085-1089. 10.1016/j.jhep.2003.09.022View ArticlePubMedGoogle Scholar
- Neff GW, Nery J, Lau DT: Tenofovir therapy for lamivudine resistance following liver transplantation. Ann Pharmacotherapy. 2004, 38: 1999-2004. 10.1345/aph.1E280.View ArticleGoogle Scholar
- Toniutto P, Fumo E, Caldato M: Favourable outcome of adefovir-dipivoxil treatment in acute de novo Hepatitis B after liver transplantation. Transplantation. 2004, 77: 472-473. 10.1097/01.TP.0000113466.53834.8AView ArticlePubMedGoogle Scholar
- Samuel D, Muller R, Alexander G: Liver transplantation in European patients with the Hepatitis B surface antigen. N Engl J Med. 1993, 329: 1842-1847. 10.1056/NEJM199312163292503View ArticlePubMedGoogle Scholar
- Terrault NA, Zhou S, Combs C: Prophylaxis in liver transplant recipients using a fixed dosing schedule of Hepatitis B immunoglobulin. Hepatology. 1996, 24: 1327-1333.View ArticlePubMedGoogle Scholar
- Muller R, Gubernatis G, Farle M: Liver transplantation in HBs antigen (HBsAg) carriers: Prevention of Hepatitis B virus (HBV) recurrence by passive immunization. J Hepatol. 1991, 13: 90-96. 10.1016/0168-8278(91)90869-DView ArticlePubMedGoogle Scholar
- Samuel D, Bismuth A, Mathieu D: Passive immunoprophylaxis after liver transplantation in HBsAg-positive patients. Lancet. 1991, 337: 813-815. 10.1016/0140-6736(91)92515-4View ArticlePubMedGoogle Scholar
- Rinoldi P, Belli L, Rondinara G: Recurrent HBV/HDV infections under different immunoprophylaxis protocols. Transplant Proc. 1993, 25: 2675-2676.Google Scholar
- Steinmuller T, Seehoffer D, Rayes N: Increasing applicability of liver transplantation for patients with Hepatitis B-related liver disease. Hepatology. 2002, 35: 1528-1535. 10.1053/jhep.2002.33681View ArticlePubMedGoogle Scholar
- Mohanty SR, Cotler SJ: Management of Hepatitis B in liver transplant patients. J Clin Gastroenterol. 2005, 39: 58-63.PubMedGoogle Scholar
- McGory RW, Ishitani MB, Oliveira WM: Improved outcome of orthotopic liver transplantation for chronic Hepatitis B cirrhosis with aggressive passive immunization. Transplantation. 1996, 61: 1358-1364. 10.1097/00007890-199605150-00013View ArticlePubMedGoogle Scholar
- Konig V, Hopf U, Neuhaus P: Long-term follow-up of Hepatitis B virus-infected recipients after orthotopic liver transplantation. Transplantation. 1994, 58: 553-559.View ArticlePubMedGoogle Scholar
- Samuel D, Bismuth A, Serres C: HBV infection after liver transplantation in HBsAg positive patients: Experience with long-term immunoprophylaxis. Transplant Proc. 1991, 33: 1492-1494.Google Scholar
- Sawyer RG, McGory RW, Gaffey MJ: Improved clinical outcomes with liver transplantation for Hepatitis B- induced chronic liver failure using passive immunization. Ann Surg. 1998, 227: 841-50. 10.1097/00000658-199806000-00007PubMed CentralView ArticlePubMedGoogle Scholar
- Cooreman MP, Leroux-Roels G, Paulij WP: Vaccine and Hepatitis B immune globulin-induced escape mutations of Hepatitis B virus surface antigen. J Biomed Sci. 2001, 8: 237-247.View ArticlePubMedGoogle Scholar
- Fung J, Ostberg L, Shapiro R: Human monoclonal antibody against Hepatitis B surface antigen in preventing recurrent Hepatitis B following liver transplantation. Viral Hepatitis and Liver Disease. Edited by: Hollinger FB, Lemon, SM, and Margolis, HS. 1991, Baltimore: Williams and WilkinsGoogle Scholar
- McMahon G, Ehrlich PH, Moustafa ZA: Genetic alterations in the gene encoding the major HBsAg: DNA and immunological analysis of recurrent HBSAg derived from monoclonal antibody-treated liver transplant patients. Hepatology. 1992, 15: 755-766.View ArticleGoogle Scholar
- Galun E, Eren R, Safadi R: Clinical evaluation (Phase I) of a combination of two human monoclonal antibodies to HBV: Safety and antiviral properties. Hepatology. 2002, 35: 673-679. 10.1053/jhep.2002.31867View ArticlePubMedGoogle Scholar
- Lai CL, Chien RN, Leung NW: A one-year trial of lamivudine for chronic Hepatitis B: Asia hepatitis lamivudine study group. N Engl J Med. 1998, 339: 61-68. 10.1056/NEJM199807093390201View ArticlePubMedGoogle Scholar
- Dienstag JL, Perrilo RP, Schiff ER: A preliminary trial of lamivudine for chronic Hepatitis B infection. N Engl J Med. 1995, 333: 1657-1661. 10.1056/NEJM199512213332501View ArticlePubMedGoogle Scholar
- Marzano A, Salizzoni M, Debernardi-Venon W: Prevention of Hepatitis B virus recurrence after liver transplantation in cirrhotic patients treated with lamivudine and passive immunoprophylaxis. J Hepatol. 2001, 34: 903-910. 10.1016/S0168-8278(01)00080-0View ArticlePubMedGoogle Scholar
- Grellier L, Mutimer D, Ahmed M: Lamivudine prophylaxis against reinfection in liver transplantation for Hepatitis B cirrhosis. Lancet. 1996, 348: 1212-1215. 10.1016/S0140-6736(96)04444-3View ArticlePubMedGoogle Scholar
- Markowitz JS, Martin P, Conrad AJ: Prophylaxis against Hepatitis B recurrence following liver transplantation using combination lamivudine and Hepatitis B immune globulin. Hepatology. 1998, 28: 585-589. 10.1002/hep.510280241View ArticlePubMedGoogle Scholar
- Lo CM, Cheung ST, Lai CL: Liver transplantation in Asian patients with chronic Hepatitis B using lamivudine prophylaxis. Ann Surg. 2001, 233: 276-281. 10.1097/00000658-200102000-00018PubMed CentralView ArticlePubMedGoogle Scholar
- Seehofer D, Rayes N, Naumann U: Preoperative antiviral treatment and postoperative prophylaxis in HBV-DNA positive patients undergoing liver transplantation. Transplantation. 2001, 72: 1381-1385. 10.1097/00007890-200110270-00008View ArticlePubMedGoogle Scholar
- Fontana RJ, Keefe EB, Carey W: Effect of lamivudine treatment on survival of 309 North American patients awaiting liver transplantation for chronic Hepatitis B. Liver Transplant. 2002, 8: 433-439. 10.1053/jlts.2002.32983.View ArticleGoogle Scholar
- Andreone P, Biselli M, Gramenzi A: Efficacy of lamivudine therapy for advanced liver disease in patients with precore mutant Hepatitis B virus infection awaiting liver transplantation. Transplantation. 2002, 8: 1119-1124. 10.1097/00007890-200210270-00011.View ArticleGoogle Scholar
- Fontana RJ, Hann HW, Perrillo RP: Determinants of early mortality in patients with decompensated chronic Hepatitis B treated with antiviral therapy. Gastroenterology. 2002, 123: 719-727. 10.1053/gast.2002.35352View ArticlePubMedGoogle Scholar
- Dienstag JL, Schiff ER, Wright TL: Lamivudine as initial treatment for chronic Hepatitis B in the United States. N Engl J Med. 1999, 341: 1256-1263. 10.1056/NEJM199910213411702View ArticlePubMedGoogle Scholar
- Schalm SW, Heathcote J, Cianciara J: Lamivudine and alfa interferon combination treatment of patients with chronic Hepatitis B infection: A randomized trial. Gut. 2000, 46: 562-568. 10.1136/gut.46.4.562PubMed CentralView ArticlePubMedGoogle Scholar
- Liaw YF, Leung NW, Chang TT: Effects of extended lamivudine therapy in Asian patients with chronic Hepatitis B: Asia hepatitis lamivudine study group. Gastroenterology. 2000, 119: 172-180. 10.1053/gast.2000.8559View ArticlePubMedGoogle Scholar
- Leung NW, Lai CL, Chang TT: Extended lamivudine treatment in patients with chronic Hepatitis B enhances Hepatitis B e antigen seroconversion rates: results after 3 years of therapy. Hepatology. 2001, 33: 1527-1532. 10.1053/jhep.2001.25084View ArticlePubMedGoogle Scholar
- Stuyver LJ, Locarnini SA, Lok A: Nomenclature for antiviral-resistant human Hepatitis B mutations in the polymerase region. Hepatology. 2001, 33: 751-757. 10.1053/jhep.2001.22166View ArticlePubMedGoogle Scholar
- Liaw Y-F: Results of lamivudine in Asian trials. Proceedings of EASL International Consensus Conference on Hepatitis B. 2002.Google Scholar
- Zoulim F: A preliminary benefit-risk assessment of lamivudine for the treatment of chronic Hepatitis B virus infection. Drug Safety. 2002, 25: 497-510. 10.2165/00002018-200225070-00004View ArticlePubMedGoogle Scholar
- Mutimer D, Dushieko G, Barrett C: Lamivudine without HBIg for prevention of graft reinfection by Hepatitis B: Long-term follow-up. Transplantation. 2000, 70: 809-815. 10.1097/00007890-200009150-00018View ArticlePubMedGoogle Scholar
- Vierling J: Management of HBV infection in liver transplant recipients. Int J Med Sci. 2005, 2: 41-49.PubMed CentralView ArticlePubMedGoogle Scholar
- Malkan G, Cattral M, Humar A: Lamivudine for Hepatitis B in liver transplantation. Transplantation. 2000, 69: 1403-1407. 10.1097/00007890-200004150-00033View ArticlePubMedGoogle Scholar
- Roche B, Samuel D: Transplantation for viral Hepatitis A and B. Transplantation of the Liver. Edited by: Busutill, RW, and Klintmalm, GB. 2005, 115-129. Philadelphia: Elsevier.View ArticleGoogle Scholar
- Roche B, Samuel D, Roque AM: Lamivudine therapy for HBV infection after liver transplantation. J Hepatol. 1999, 30: 78-Google Scholar
- Angus PW, McCaughan GW, Gane EJ: Combination low-dose Hepatitis B immune globulin and lamivudine therapy provides effective prophylaxis against posttransplantation Hepatitis B. Liver Transpl. 2000, 6: 429-433. 10.1053/jlts.2000.8310View ArticlePubMedGoogle Scholar
- Yao FY, Osario RW, Roberts JP: Intramuscular Hepatitis B immune globulin combined with lamivudine for prophylaxis against Hepatitis B recurrence after liver transplantation. Liver Transpl Surg. 1999, 5: 491-496. 10.1002/lt.500050605View ArticlePubMedGoogle Scholar
- Yoshida EM, Erb SR, Partovi N: Liver transplantation for chronic Hepatitis B infection with the use of combination lamivudine and low-dose Hepatitis B immune globulin. Liver Transpl Surg. 1999, 5: 520-525. 10.1002/lt.500050602View ArticlePubMedGoogle Scholar
- McCaughan GW, Spencer J, Koorey D: Lamivudine therapy in patients undergoing liver transplantation for Hepatitis B virus precore mutant-associated infection: High resistance rates in treatment of recurrence but universal prevention if used as prophylaxis with very low dose Hepatitis B immune globulin. Liver Transpl Surg. 1999, 6: 512-519. 10.1002/lt.500050601.View ArticleGoogle Scholar
- Han SH, Ofman J, Holt C: An efficacy and cost-effectiveness analysis of combination Hepatitis B immune globulin and lamivudine to prevent recurrent Hepatitis B after orthotopic liver transplantation compared with Hepatitis B immune globulin monotherapy. Liver Transpl. 2001, 6: 741-748. 10.1053/jlts.2000.18702.View ArticleGoogle Scholar
- Seehofer D, Rayes N, Naumann U: Preoperative antiviral treatment and postoperative prophylaxis in HBV-DNA positive patients undergoing liver transplantation. Transplantation. 2001, 72: 1381-1385. 10.1097/00007890-200110270-00008View ArticlePubMedGoogle Scholar
- Gane EJ, McCaughan G, Crawford D: Combination lamivudine plus low dose intramuscular Hepatitis B immunoglobulin prevents recurrent Hepatitis B and may eradicate residual graft infection. Hepatology. 2002, 36: 221A-Google Scholar
- Marcellin P, Chang T-T, Lim SG: Adefovir dipivoxil for the treatment of Hepatitis B e antigen positive Hepatitis B. N Eng J Med. 2003, 348: 808-816. 10.1056/NEJMoa020681.View ArticleGoogle Scholar
- Hadziyannis SJ, Tassopoulos N, Heathcote EJ: Adefovir dipivoxil for the treatment of Hepatitis B e antigen negative Hepatitis B. N Eng J Med. 2003, 348: 800-807. 10.1056/NEJMoa021812.View ArticleGoogle Scholar
- Benhamou Y, Bochet M, Thibault V: Safety and efficacy of adefovir dipivoxil in patients co-infected with HIV-1 and lamivudine-resistant Hepatitis B virus: An open label pilot study. Lancet. 2001, 358: 718-723. 10.1016/S0140-6736(01)05840-8View ArticlePubMedGoogle Scholar
- Deeks SG, Collier A, Larezra J: The safety and efficacy of Adefovir dipivoxil, a novel anti-human immunodeficiency virus (HIV) therapy in HIV-infected adults: A randomized, double-blind, placebo-controlled trial. J Infect Dis. 1997, 176: 1517-1523.View ArticlePubMedGoogle Scholar
- Schiff ER, Lai C-L, Hadziyannis S: Adefovir dipivoxil therapy for lamivudine-resistant Hepatitis B in pre- and post-liver transplantation patients. Hepatology. 2003, 38: 1419-1427.PubMedGoogle Scholar
- Lo CM, Li CL, Lau GK: Liver transplantation for chronic Hepatitis B with lamivudine-resistant YMDD mutant using add-on adefovir dipivoxil plus lamivudine. Liver Transplantation. 2005, 11: 807-813. 10.1002/lt.20416View ArticlePubMedGoogle Scholar
- Yang H, Westland CE, Delaney WET: Resistance surveillance in chronic Hepatitis B patients treated with adefovir dipivoxil for up to 60 weeks. Hepatology. 2002, 36: 464-473. 10.1053/jhep.2002.34740View ArticlePubMedGoogle Scholar
- Xiong S, Yang H, Westland C: Resistance surveillance of HBeAg-chronic Hepatitis B patients treated for 2 years with adefovir dipivoxil. J Hepatol. 2003, 38: A4543-10.1016/S0168-8278(03)80005-3.View ArticleGoogle Scholar
- Locarnini S, Qi X, Arterburn S: Incidence and predictors of emergence of adefovir resistant HBV during four years of adefovir dipivoxil (ADV) therapy for patients with chronic Hepatitis B (CHB). J Hepatol. 2005, 42 (Suppl 2): A36-Google Scholar
- Fung SK, Andreone P, Han SH: Adefovir-resistant Hepatitis B can be associated with viral rebound and hepatic decompensation. J Hepatol. 2005, 43: 937-943. 10.1016/j.jhep.2005.05.037View ArticlePubMedGoogle Scholar
- Fung SK, Chae HB, Fontana RJ: Virologic response and resistance to adefovir in patients with chronic Hepatitis B. J Hepatol. 2006, 44: 283-290. 10.1016/j.jhep.2005.10.018View ArticlePubMedGoogle Scholar
- Snow A, Thibault V, Qi X: Combination of adefovir (ADV) and lamivudine (LAM) prevented emergence of adefovir resistance mutations in chronic Hepatitis B patients with lamivudine-resistant HBV. Gastroenterology. 2005, 128: M945-Google Scholar
- Perillo R, Rakela J, Dienstag J: Multicenter study of lamivudine therapy for Hepatitis B after liver transplantation. Hepatology. 1999, 29: 1581-1586. 10.1002/hep.510290507View ArticleGoogle Scholar
- Rayes N, Seehofer D, Hopf U: Comparison of famciclovir and lamivudine in the long-term treatment of Hepatitis B infection after liver transplantation. Transplantation. 2001, 71: 96-101. 10.1097/00007890-200101150-00016View ArticlePubMedGoogle Scholar
- Fontana RJ, Hann HW, Wright T: A multicenter study of lamivudine treatment in 33 patients with Hepatitis B after liver transplantation. Liver Transpl. 2001, 6: 504-510. 10.1053/jlts.2001.24896.View ArticleGoogle Scholar
- Echanojauregui A, Planas J, Gonzalez E: Adefovir dipivoxil therapy in liver transplant recipients with lamivudine-resistant Hepatitis B virus. Transplantation Proceedings. 2005, 37: 1507-1508. 10.1016/j.transproceed.2005.02.031View ArticleGoogle Scholar
- Beckebaum S, Malago M, Dirsch O: Efficacy of combined lamivudine and adefovir dipivoxil treatment for severe HBV graft reinfection after liver donor liver transplantation. Clin Transplant. 2003, 17: 554-559. 10.1046/j.0902-0063.2003.00097.xView ArticlePubMedGoogle Scholar
- Honkoop P, de Man RA: Entecavir: A potent new antiviral drug for Hepatitis B. Expert Opin Investig Drugs. 2003, 12: 683-688. 10.1517/135437220.127.116.113View ArticlePubMedGoogle Scholar
- de Man RA, Wolters LM, Nevens F: Safety and efficacy of oral entecavir given for 28 days in patients with chronic Hepatitis B infections. Hepatology. 2001, 34: 578-582. 10.1053/jhep.2001.26815View ArticlePubMedGoogle Scholar
- Wolters LM, Hansen BE, Niesters HG: Viral dynamics during and after entecavir therapy in patients with chronic Hepatitis B. J Hepatol. 2002, 37: 137-144. 10.1016/S0168-8278(02)00115-0View ArticlePubMedGoogle Scholar
- Shakil AO, Angus P, Gerken G: Entecavir reduces viral load in liver transplant patients who have failed prophylaxis or treatment for Hepatitis B. Hepatology. 2001, 34: 619A-Google Scholar
- Kuo A, Dienstag JL, Chung RT: Tenofovir disoproxil fumarate for the treatment of lamivudine-resistant Hepatitis B. Clin Gastroenterol Hepatol. 2004, 2: 266-272. 10.1016/S1542-3565(04)00017-5View ArticlePubMedGoogle Scholar
- Van Bommel F, Schernick A, Hopf U: Tenofovir disoproxil fumarate exhibits strong antiviral effect in a patient with lamivudine-resistant severe Hepatitis B reactivation. Gastroenterology. 2003, 124: 586-587. 10.1053/gast.2003.1240586bView ArticlePubMedGoogle Scholar
- Van Bommel F, Wunsche T, Schurmann D: Tenofovir treatment in patients with lamivudine-resistant Hepatitis B mutants strongly affects viral replication. Hepatology. 2002, 36: 507-508. 10.1053/jhep.2002.35328View ArticlePubMedGoogle Scholar
- Taltavull TC, Chahri N, Verdura B: Successful treatment with tenofovir in a Child C cirrhotic patient with lamivudine-resistant Hepatitis B virus awaiting liver transplantation. Post-transplant Results. Transplant International. 2005, 18: 879-883. 10.1111/j.1432-2277.2005.00125.xView ArticlePubMedGoogle Scholar
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