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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Rational Basis for Optimizing Short and Long-term Hepatitis B Virus Prophylaxis Post Liver Transplantation: Role of Hepatitis B Immune Globulin</title><author><name sortKey="Roche, Bruno" sort="Roche, Bruno" uniqKey="Roche B" first="Bruno" last="Roche">Bruno Roche</name><affiliation><nlm:aff id="aff1"> AP-HP Hôpital Paul Brousse, Centre Hépato-Biliaire, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff2"> INSERM, U 1193, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff3"> Univ Paris-Sud, UMR-S 1193, Villejuif, France.</nlm:aff></affiliation></author><author><name sortKey="Roque Afonso, Anne Marie" sort="Roque Afonso, Anne Marie" uniqKey="Roque Afonso A" first="Anne Marie" last="Roque-Afonso">Anne Marie Roque-Afonso</name><affiliation><nlm:aff id="aff2"> INSERM, U 1193, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff3"> Univ Paris-Sud, UMR-S 1193, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff4"> AP-HP Hôpital Paul Brousse, Laboratoire de Virologie, Villejuif, France.</nlm:aff></affiliation></author><author><name sortKey="Nevens, Frederik" sort="Nevens, Frederik" uniqKey="Nevens F" first="Frederik" last="Nevens">Frederik Nevens</name><affiliation><nlm:aff id="aff5"> Division of Liver and Biliopancreatic disorders, University Hospitals, KU, Leuven, Belgium.</nlm:aff></affiliation></author><author><name sortKey="Samuel, Didier" sort="Samuel, Didier" uniqKey="Samuel D" first="Didier" last="Samuel">Didier Samuel</name><affiliation><nlm:aff id="aff1"> AP-HP Hôpital Paul Brousse, Centre Hépato-Biliaire, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff2"> INSERM, U 1193, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff3"> Univ Paris-Sud, UMR-S 1193, Villejuif, France.</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">26038873</idno><idno type="pmc">4539198</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4539198</idno><idno type="RBID">PMC:4539198</idno><idno type="doi">10.1097/TP.0000000000000777</idno><date when="2015">2015</date><idno type="wicri:Area/Pmc/Corpus">000070</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Rational Basis for Optimizing Short and Long-term Hepatitis B Virus Prophylaxis Post Liver Transplantation: Role of Hepatitis B Immune Globulin</title><author><name sortKey="Roche, Bruno" sort="Roche, Bruno" uniqKey="Roche B" first="Bruno" last="Roche">Bruno Roche</name><affiliation><nlm:aff id="aff1"> AP-HP Hôpital Paul Brousse, Centre Hépato-Biliaire, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff2"> INSERM, U 1193, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff3"> Univ Paris-Sud, UMR-S 1193, Villejuif, France.</nlm:aff></affiliation></author><author><name sortKey="Roque Afonso, Anne Marie" sort="Roque Afonso, Anne Marie" uniqKey="Roque Afonso A" first="Anne Marie" last="Roque-Afonso">Anne Marie Roque-Afonso</name><affiliation><nlm:aff id="aff2"> INSERM, U 1193, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff3"> Univ Paris-Sud, UMR-S 1193, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff4"> AP-HP Hôpital Paul Brousse, Laboratoire de Virologie, Villejuif, France.</nlm:aff></affiliation></author><author><name sortKey="Nevens, Frederik" sort="Nevens, Frederik" uniqKey="Nevens F" first="Frederik" last="Nevens">Frederik Nevens</name><affiliation><nlm:aff id="aff5"> Division of Liver and Biliopancreatic disorders, University Hospitals, KU, Leuven, Belgium.</nlm:aff></affiliation></author><author><name sortKey="Samuel, Didier" sort="Samuel, Didier" uniqKey="Samuel D" first="Didier" last="Samuel">Didier Samuel</name><affiliation><nlm:aff id="aff1"> AP-HP Hôpital Paul Brousse, Centre Hépato-Biliaire, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff2"> INSERM, U 1193, Villejuif, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff3"> Univ Paris-Sud, UMR-S 1193, Villejuif, France.</nlm:aff></affiliation></author></analytic><series><title level="j">Transplantation</title><idno type="ISSN">0041-1337</idno><idno type="eISSN">1534-6080</idno><imprint><date when="2015">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><title>Abstract</title><p>Antiviral therapy using newer nucleos(t)ide analogues with lower resistance rates, such as entecavir or tenofovir, suppress hepatitis B virus (HBV) replication, improve liver function in patients with compensated or decompensated cirrhosis, and delay or obviate the need for liver transplantation in some patients. After liver transplantation, the combination of long-term antiviral and low-dose hepatitis B Immune globulin (HBIG) can effectively prevent HBV recurrence in greater than 90% of transplant recipients. Some forms of HBV prophylaxis need to be continued indefinitely after transplantation but, in patients with a low-risk of HBV recurrence (i.e., HBV DNA levels undetectable before transplantation), it is possible to discontinue HBIG and maintain only long-term nucleos(t)ide analogue(s) therapy. A more cautious approach is necessary for those patients with high pretransplant HBV DNA levels, those with limited antiviral options if HBV recurrence occurs (i.e., HIV or hepatitis D virus coinfection, preexisting drug resistance), those with a high risk of hepatocellular carcinoma recurrence, and those at risk of noncompliance with antiviral therapy. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Transplantation</journal-id><journal-id journal-id-type="iso-abbrev">Transplantation</journal-id><journal-id journal-id-type="publisher-id">TP</journal-id><journal-title-group><journal-title>Transplantation</journal-title></journal-title-group><issn pub-type="ppub">0041-1337</issn><issn pub-type="epub">1534-6080</issn><publisher><publisher-name>Lippincott Williams & Wilkins</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">26038873</article-id><article-id pub-id-type="pmc">4539198</article-id><article-id pub-id-type="publisher-id">TP141688</article-id><article-id pub-id-type="doi">10.1097/TP.0000000000000777</article-id><article-id pub-id-type="art-access-id">00010</article-id><article-categories><subj-group subj-group-type="heading"><subject>Reviews</subject></subj-group></article-categories><title-group><article-title>Rational Basis for Optimizing Short and Long-term Hepatitis B Virus Prophylaxis Post Liver Transplantation: Role of Hepatitis B Immune Globulin</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Roche</surname><given-names>Bruno</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="aff" rid="aff2"><sup>2</sup></xref><xref ref-type="aff" rid="aff3"><sup>3</sup></xref></contrib><contrib contrib-type="author"><name><surname>Roque-Afonso</surname><given-names>Anne Marie</given-names></name><xref ref-type="aff" rid="aff2"><sup>2</sup></xref><xref ref-type="aff" rid="aff3"><sup>3</sup></xref><xref ref-type="aff" rid="aff4"><sup>4</sup></xref></contrib><contrib contrib-type="author"><name><surname>Nevens</surname><given-names>Frederik</given-names></name><xref ref-type="aff" rid="aff5"><sup>5</sup></xref></contrib><contrib contrib-type="author"><name><surname>Samuel</surname><given-names>Didier</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="aff" rid="aff2"><sup>2</sup></xref><xref ref-type="aff" rid="aff3"><sup>3</sup></xref></contrib></contrib-group><aff id="aff1"><sup>1</sup> AP-HP Hôpital Paul Brousse, Centre Hépato-Biliaire, Villejuif, France.</aff><aff id="aff2"><sup>2</sup> INSERM, U 1193, Villejuif, France.</aff><aff id="aff3"><sup>3</sup> Univ Paris-Sud, UMR-S 1193, Villejuif, France.</aff><aff id="aff4"><sup>4</sup> AP-HP Hôpital Paul Brousse, Laboratoire de Virologie, Villejuif, France.</aff><aff id="aff5"><sup>5</sup> Division of Liver and Biliopancreatic disorders, University Hospitals, KU, Leuven, Belgium.</aff><author-notes><corresp id="cor1">Correspondence: Didier Samuel, Assistance Publique-Hôpitaux de Paris, Hôpital Paul Brousse, Centre Hépato-Biliaire, 14 av P.V. Couturier, 94804, Villejuif, France. (<email>didier.samuel@pbr.aphp.fr</email>).</corresp></author-notes><pub-date pub-type="ppub"><month>7</month><year>2015</year></pub-date><pub-date pub-type="epub"><day>06</day><month>7</month><year>2015</year></pub-date><volume>99</volume><issue>7</issue><fpage>1321</fpage><lpage>1334</lpage><history><date date-type="received"><day>18</day><month>12</month><year>2014</year></date><date date-type="rev-request"><day>25</day><month>2</month><year>2015</year></date><date date-type="accepted"><day>19</day><month>3</month><year>2015</year></date></history><permissions><copyright-statement>Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.</copyright-statement><copyright-year>2015</copyright-year><copyright-holder>Wolters Kluwer Health, Inc. All rights reserved.</copyright-holder><license><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License, where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially. <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc-nd/3.0">http://creativecommons.org/licenses/by-nc-nd/3.0</ext-link>.</license-p></license></permissions><self-uri xlink:type="simple" xlink:href="tp-99-1321.pdf"></self-uri><abstract><title>Abstract</title><p>Antiviral therapy using newer nucleos(t)ide analogues with lower resistance rates, such as entecavir or tenofovir, suppress hepatitis B virus (HBV) replication, improve liver function in patients with compensated or decompensated cirrhosis, and delay or obviate the need for liver transplantation in some patients. After liver transplantation, the combination of long-term antiviral and low-dose hepatitis B Immune globulin (HBIG) can effectively prevent HBV recurrence in greater than 90% of transplant recipients. Some forms of HBV prophylaxis need to be continued indefinitely after transplantation but, in patients with a low-risk of HBV recurrence (i.e., HBV DNA levels undetectable before transplantation), it is possible to discontinue HBIG and maintain only long-term nucleos(t)ide analogue(s) therapy. A more cautious approach is necessary for those patients with high pretransplant HBV DNA levels, those with limited antiviral options if HBV recurrence occurs (i.e., HIV or hepatitis D virus coinfection, preexisting drug resistance), those with a high risk of hepatocellular carcinoma recurrence, and those at risk of noncompliance with antiviral therapy. In this group, HBIG-free prophylaxis cannot be recommended.</p></abstract><abstract abstract-type="toc"><p>The combination of long-term antiviral and low-dose Hepatitis B Immune globulin (HBIG) can effectively prevent HBV recurrence in > 90% of liver transplant recipients. In patients with low HBV DNA levels, nucleos(t)ide analogue(s) treatment without HBIG is possible.</p></abstract><custom-meta-group><custom-meta><meta-name>OPEN-ACCESS</meta-name><meta-value>TRUE</meta-value></custom-meta></custom-meta-group></article-meta></front><body><p>In the initial transplant era, recurrence of hepatitis B virus (HBV) in the liver graft occurred in up to 80%, with an aggressive course resulting in graft loss.<sup><xref rid="R1" ref-type="bibr">1</xref>,<xref rid="R2" ref-type="bibr">2</xref></sup> As a result, HBV-related liver disease constituted a relative and sometimes an absolute contraindication for liver transplantation (LT).<sup><xref rid="R2" ref-type="bibr">2</xref></sup> This changed dramatically because of the effectiveness of prophylaxis regimens and then the efficacy of antiviral therapy for treating HBV infection before and after LT.<sup><xref rid="R1" ref-type="bibr">1</xref>,<xref rid="R3" ref-type="bibr">3</xref></sup> Nowadays, the HBV-induced liver disease is not a contraindication to LT and accounts for 5% to 10% of indication for LT in the United States and Europe and is the leading cause in Asia. Indeed, chronic HBV infection is endemic in Asia, with an estimation of 300 million individuals infected with HBV, representing about 75% of the world’s chronic HBV carriers.</p><p>The advent of long-term intravenous (IV) hepatitis B immune globulin (HBIG) administration and the introduction of new antiviral agents against HBV infection, such as lamivudine (LAM) or adefovir (ADV), were a major breakthrough in the pre- and post-LT management of these patients. Nucleos(t)ides agents suppress HBV replication and improve liver function in patients with decompensated cirrhosis,<sup><xref rid="R4" ref-type="bibr">4</xref>-<xref rid="R9" ref-type="bibr">9</xref></sup> delay or obviate the need for LT in some patients<sup><xref rid="R10" ref-type="bibr">10</xref>-<xref rid="R12" ref-type="bibr">12</xref></sup> and decrease the risk of HBV recurrence after LT by reducing HBV viral load at the time of LT. Lamivudine and ADV were used in the majority of reported studies. However, they are no longer considered an optimal first-line therapy due to the high rate development of resistance. The latest guidelines suggest using new oral antiviral agents with a better safety profile, a higher efficacy, and a low rate of resistance development, such as entecavir (ETV) or tenofovir (TDV), as primary antiviral agents.<sup><xref rid="R13" ref-type="bibr">13</xref>,<xref rid="R14" ref-type="bibr">14</xref></sup> When LT is indicated for hepatocellular carcinoma (HCC) or advanced liver failure, the use of nucleos(t)ides agents before transplantation and the combination prophylaxis with nucleos(t)ides agents and HBIG after transplantation prevents HBV recurrence in 90% to 100% of patients and produces survival rates at 5 years in over 80%.<sup><xref rid="R15" ref-type="bibr">15</xref>,<xref rid="R16" ref-type="bibr">16</xref></sup> There is a consensus regarding the use of a lifelong HBV prophylactic therapy supported by the detection of low levels of HBV DNA in serum, liver, and peripheral blood mononuclear cells or the presence of total and covalently closed circular HBV DNA (ccc DNA) in liver tissue transiently after LT even in the absence of a positive hepatitis B surface antigen (HBsAg), whatever the prophylaxis used.<sup><xref rid="R17" ref-type="bibr">17</xref>-<xref rid="R23" ref-type="bibr">23</xref></sup> However, this long-term prophylaxis using IV HBIG can be expensive and inconvenient for patients. This has led to the development of alternative strategies aimed to change the route of administration of HBIG, to reduce the dose or duration of HBIG, or to avoid the use of HBIG. However, a more cautious approach is necessary for those patients with a high risk of HBV recurrence: high pretransplant HBV DNA levels, those with limited antiviral options if HBV recurrence occurs (i.e., HIV or hepatitis D virus [HDV] coinfection, preexisting antiviral drug resistance), those with a high risk of HCC recurrence, and finally those with a risk of noncompliance with antiviral therapy. In this group, HBIG-free prophylaxis cannot be recommended.<sup><xref rid="R1" ref-type="bibr">1</xref></sup></p><p>In this review, we will describe the significant improvements in the prevention of HBV recurrence after LT for HBV-related liver disease and the role of HBIG in the short- and long-term prophylaxis.</p><sec><title>DIAGNOSIS, MECHANISMS AND RISK FACTORS FOR HBV RECURRENCE AFTER LT</title><p>Hepatitis B virus is a small enveloped DNA virus with a genome consisting of circular, partially double-stranded DNA containing 4 overlapping open reading frames. The envelope is composed of 3 surface proteins, large (LHBs), middle (MHBs), and small (SHBs), encoded within one open reading frame. The N-terminal part of LHBs binds at the hepatocyte membrane to the sodium taurocholate cotransporting polypeptide, recently reported as a high affinity receptor for HBV.<sup><xref rid="R24" ref-type="bibr">24</xref></sup> All 3 proteins contain an external hydrophilic loop which carries the major antigenic determinant (a-determinant) of HBV. The 3-dimensional structure of this antigenic loop is essential for infectivity, probably through interaction with heparan sulphate proteoglycans at the hepatocyte membrane. Complete inhibition of HBV infection can be obtained by targeting LHB’s interaction with the HBV receptor<sup><xref rid="R25" ref-type="bibr">25</xref>,<xref rid="R26" ref-type="bibr">26</xref></sup> or by anti-HBs antibodies. The HBV genome is converted in the cell nucleus into cccDNA which associates with histone and nonhistone proteins that control transcription of viral RNAs. Viral replication involves the retrotranscription of viral pregenomic RNA, source of significant genetic variability. During active replication, the cccDNA pool is maintained by intracellular reimport of newly synthesized viral DNA. In addition, large amounts of subviral surface antigen particles are secreted; their production only depends on the S domain of surface proteins.</p><p>Recurrence of HBV infection after LT is commonly defined as the reappearance of circulating HBsAg with or without detectable HBV DNA. However, only patients who develop persistently detectable HBV DNA are shown to be at risk for clinical disease (increase in aminotransferase levels and histological evidence of acute or chronic hepatitis) and graft loss.<sup><xref rid="R1" ref-type="bibr">1</xref></sup> This is why certain groups consider HBV DNA reappearance as the marker of HBV reinfection. The HBV reinfection is the consequence of an immediate reinfection of the graft by circulating HBV particles or a later reinfection from HBV particles coming from extrahepatic sites, such as peripheral blood mononuclear cells<sup><xref rid="R21" ref-type="bibr">21</xref>,<xref rid="R27" ref-type="bibr">27</xref></sup> or both.</p><p>Whatever the prophylaxis used, there is a direct relationship between the HBV viral load at transplantation (i.e., > 10<sup>5</sup> copies/mL or > 20 000 IU/mL with the approximate conversion factor of 5 copies per international unit for PCR methods) and the rate of HBV recurrence.<sup><xref rid="R15" ref-type="bibr">15</xref>,<xref rid="R28" ref-type="bibr">28</xref>-<xref rid="R32" ref-type="bibr">32</xref></sup> Of note, hybridization assays used in earlier studies were much less sensitive than current real-time PCR assays (up to 10,000 times), and the viral load was not expressed in International Units as nowadays; moreover, different thresholds have been used to define a higher risk of recurrence, depending upon the HBV DNA assay. Other factors associated with low rates of recurrence are surrogate markers for low levels of viral replication and include negative hepatitis B e antigen (HBeAg) status at listing, fulminant HBV, and HDV coinfection.<sup><xref rid="R15" ref-type="bibr">15</xref>,<xref rid="R30" ref-type="bibr">30</xref></sup> There is consensus for the use of antivirals before transplantation to achieve undetectable HBV DNA levels aiming at reducing the risk of HBV recurrence.</p><p>In addition, several studies have reported that HCC at LT, HCC recurrence, or chemotherapy used for HCC are independently associated with an increased risk of HBV recurrence.<sup><xref rid="R33" ref-type="bibr">33</xref>-<xref rid="R37" ref-type="bibr">37</xref></sup> The association between HCC and HBV recurrence and the detection of cccDNA in HCC cells suggest the possibility of viral replication in tumor cells, which would then act as a viral reservoir.</p><p>In patients receiving antiviral monoprophylaxis with low genetic barrier agents, such as LAM, HBsAg remains positive, progressively declining over a period of a few months after transplantation to become undetectable. In compliant patients, recurrence is most often associated with HBV polymerase mutations.<sup><xref rid="R5" ref-type="bibr">5</xref>,<xref rid="R29" ref-type="bibr">29</xref>,<xref rid="R38" ref-type="bibr">38</xref>-<xref rid="R41" ref-type="bibr">41</xref></sup> Infection with resistant variants before LT increases the risk of recurrence regardless of viral load at transplantation.<sup><xref rid="R35" ref-type="bibr">35</xref>-<xref rid="R42" ref-type="bibr">42</xref></sup></p><p>In patients without overt recurrence, persistence or reappearance of HBsAg positivity without detection of HBV DNA can be observed.<sup><xref rid="R39" ref-type="bibr">39</xref>,<xref rid="R43" ref-type="bibr">43</xref></sup> Indeed, viral mRNAs can still be produced from the cccDNA template in the infected liver graft, depending on epigenetic factors. In treated patients, the reverse-transcription step of replication is inhibited, precluding the formation of virions which requires the interaction of mature nucleocapsids containing dsDNA with the surface proteins. In contrast to virions, the formation of subviral HBsAg particles only depends on transcription and translation of the S-domain of surface proteins and their secretion follows a distinct secretory pathway.<sup><xref rid="R44" ref-type="bibr">44</xref></sup></p><p>After the removal of the major viral reservoir, the use of HBIG at the anhepatic phase is aiming at inhibiting entry by neutralizing viral determinants of attachment. In patients receiving HBIG, HBV reinfection may be the consequence of the incomplete neutralization of viral particles at the anhepatic phase, due to high viral load, HBV overproduction coming from extrahepatic sites or an insufficiency of anti-HBs titres. Recurrence is often, but not exclusively, associated with the emergence of escape variants with mutations in the S domain of HBV, and particularly in the antigenic loop (“a” determinant).<sup><xref rid="R45" ref-type="bibr">45</xref>,<xref rid="R46" ref-type="bibr">46</xref></sup> These variants may preexist before LT, even in peripheral blood mononuclear cells,<sup><xref rid="R27" ref-type="bibr">27</xref></sup> and may emerge on HBIG selection pressure.</p><p>Reinfection in patients on combined therapy with HBIG and antiviral agents with a low genetic barrier are associated with mutations in both the surface and the polymerase genes.<sup><xref rid="R47" ref-type="bibr">47</xref></sup></p><p>Whatever the prophylaxis used, measurable low levels of HBV DNA have been reported after LT in a significant proportion of patients without detectable HBsAg and without evidence of chronic hepatitis on the liver graft. The HBV DNA has been reported in serum, peripheral blood mononuclear cells and in liver both total and/or cccDNA.<sup><xref rid="R17" ref-type="bibr">17</xref>-<xref rid="R23" ref-type="bibr">23</xref></sup> These findings suggest that occult HBV reinfection occurs in some HBV recipients and implies a risk of overt HBV recurrence if prophylaxis is stopped. In the study by Hussain et al,<sup><xref rid="R18" ref-type="bibr">18</xref></sup> the longitudinal analysis of posttransplant biopsies showed a progressive decline of graft cccDNA. Indeed, HBV cccDNA is not integrated within the host genome and has no origin of replication for amplification during cell division. Clearance of cccDNA may thus be expected on long-term control of viral replication. This control involves interplay of HBV and immune responses, factors which are modified in the LT recipient by the use of antiviral prophylaxis and by immunosuppressive drugs. Conversely, for the few patients who are negative for HBV DNA and cccDNA in all compartments, the discontinuation of HBV prophylaxis might be considered.<sup><xref rid="R23" ref-type="bibr">23</xref></sup></p></sec><sec><title>ROLE OF HBIG IN PREVENTION OF HBV RECURRENCE</title><p>Since the study by Samuel et al,<sup><xref rid="R30" ref-type="bibr">30</xref></sup> HBIG has been the cornerstone of prophylaxis against HBV recurrence after LT. This study demonstrated a dramatic reduction in the rate of HBV recurrence, from 75% in patients receiving no or short-term therapy with HBIG, to 33% in those receiving long-term IV HBIG treatment (<italic>P</italic> < 0.001) and was associated with improved graft and patient survival. Recurrence of HBV occurred in 67% of patients who underwent transplantation for HBV cirrhosis, in 83% of those with detectable serum HBV DNA at the time of LT and in 58% of those with undetectable HBV DNA, in 32% of patients who underwent transplantation for HDV cirrhosis and in 17% of patients who underwent transplantation for fulminant hepatitis B. The HBV recurrence rate was related to the presence of HBV replication, which was assessed by both HBeAg and HBV-DNA detection in serum using conventional hybridization techniques at the time of LT. These results were confirmed by other clinical trials in the United States, Europe, and Asia and by long-term follow-up studies and sustained efforts to reduce HBV replication in patients with HBV cirrhosis while waiting for LT.<sup><xref rid="R17" ref-type="bibr">17</xref>,<xref rid="R48" ref-type="bibr">48</xref>-<xref rid="R50" ref-type="bibr">50</xref></sup> The advent of antiviral therapy further changed the landscape of post-LT prophylaxis and the standard of care now is to combine HBIG with a nucleos(t)ide analog. Reduction of the pretransplant viral load with antivirals decreases the risk that high levels of HBsAg saturate the binding capacity of HBIG and the immune pressure that triggers the selection of mutation of the “a” determinant of the HBV surface protein. Antivirals inhibit HBV replication allowing a dose reduction of HBIG. Binding of HBV particles by HBIG may reduce the viral substrate available to antivirals and may thus decrease the risk for the development of resistant mutants.</p><sec><title>Proposed Mechanisms of HBIG</title><p>The mechanism(s) by which HBIG protects the transplanted liver against HBV reinfection are not fully understood. HBIG is an anti-HBV polyclonal antibody derived from pooled plasma. In France, HBIG is mainly produced from vaccine-immunized donors, thus it only contains antibodies to the SHBs protein of HBV and not to the LHBs that interact with the HBV specific receptor. However, antibodies directed against the antigenic loop of SHBs are sufficient to completely inhibit infection. The HBIG is thus thought to bind to circulating viral and subviral particles and to prevent their attachment to proteoglycans at the hepatocyte membrane. Also, by binding to infected hepatocytes expressing HBsAg, it could enhance antibody-dependent cell-mediated cytotoxicity, as shown for other viruses.<sup><xref rid="R51" ref-type="bibr">51</xref></sup> In addition, HBIG can be internalized in hepatocytes and has been shown to bind to intracellular HBsAg inhibiting virions and subviral HBsAg particle secretion.<sup><xref rid="R52" ref-type="bibr">52</xref></sup></p><p>The HBIG has no effect on viral replication, in contract to antivirals that directly inhibit HBV replication in hepatocytes. However, direct antiviral agents cannot eliminate the cccDNA reservoir in the nucleus of infected cells.<sup><xref rid="R53" ref-type="bibr">53</xref></sup> Whatever the mechanism involved, there is evidence for a dose-dependent response to HBIG treatment.<sup><xref rid="R54" ref-type="bibr">54</xref>,<xref rid="R55" ref-type="bibr">55</xref></sup> Indeed, Cholongitas et al<sup><xref rid="R55" ref-type="bibr">55</xref></sup> have reviewed that a lower frequency of HBV recurrence was associated with a high HBIG dosage (≥10,000 IU/day) versus a low HBIG dosage (<10,000 IU/day) during the first week after LT for patients receiving HBIG and nucleoside agents (LAM and/or ADV). The dose of HBIG needed during the anhepatic and the early postoperative phase to decrease HBsAg and raise anti-HBs is determined by HBsAg levels at the time of transplantation.<sup><xref rid="R56" ref-type="bibr">56</xref></sup> Daily monitoring of HBsAg and anti-HBs levels during the initial days after LT is important to adapt HBIG doses. Evaluation of patients failing HBIG prophylaxis indicates that early recurrence of HBV post-LT is typically related to insufficient dosing of HBIG and is more frequent in patients with a high level of pre-LT HBV replication, whereas late recurrences are usually caused by the emergence of mutations involving the “a” determinant of the HBV surface protein.</p></sec><sec><title>Protocols for the Administration of HBIG</title><p>In the initial protocols, HBIG was used at high doses during the anhepatic phase and the first postoperative week (i.e., generally 10 000 IU/day) to neutralize HBsAg and to provide maximal protection against reinfection of the graft (Table <xref ref-type="table" rid="T1">1</xref>).<sup><xref rid="R29" ref-type="bibr">29</xref>,<xref rid="R31" ref-type="bibr">31</xref>,<xref rid="R33" ref-type="bibr">33</xref>-<xref rid="R35" ref-type="bibr">35</xref>,<xref rid="R57" ref-type="bibr">57</xref>-<xref rid="R70" ref-type="bibr">70</xref></sup> The use of antivirals and HBIG post-LT provides complementary forms of prophylaxis. Dickson et al<sup><xref rid="R71" ref-type="bibr">71</xref></sup> reported that a combination of LAM and HBIG was associated with reduced requirements of HBIG to render the sera HBsAg negative early after LT. With combination prophylaxis regimens, the HBV recurrence rate at 1 to 2 years after transplantation has been reduced to 0% to 10% (Table <xref ref-type="table" rid="T1">1</xref>). Combination prophylaxis also allowed a reduction in the dose of HBIG required in the long-term. In the medium- and long-term follow-up, IV HBIG has been administered in 2 different ways: at a frequency dictated by the maintenance of specific anti-HBs levels (i.e., 50‐100 IU/L); or on a fixed schedule that generally “overshoots” the target anti-HBs level. The latter approach is simpler and requires less monitoring but is more expensive.<sup><xref rid="R48" ref-type="bibr">48</xref>,<xref rid="R72" ref-type="bibr">72</xref></sup> Maintenance dosing for IV HBIG is highly variable across transplant centers (Table <xref ref-type="table" rid="T1">1</xref>). The target levels for anti-HBs titres decrease with time after LT: generally anti-HBs levels were maintained at greater than 500 IU/L during months 1 to 3, at greater than 250 IU/L until months 6 to 12 and at greater than 50 to 100 IU/L thereafter. Some studies using low-dose HBIG had successful HBV prophylaxis with target anti-HBs levels of 100 IU/L<sup><xref rid="R63" ref-type="bibr">63</xref>,<xref rid="R66" ref-type="bibr">66</xref></sup> or 50 IU/L.<sup><xref rid="R67" ref-type="bibr">67</xref></sup> The optimal anti-HBs titre needed to prevent recurrence in the medium- and long-term follow-up is unknown, probably reduced if potent antiviral therapy is associated with HBIG.</p><table-wrap id="T1" position="float"><label>TABLE 1</label><caption><p>Prevention of HBV recurrence after liver transplantation with antiviral drugs and HBIG</p></caption><graphic xlink:href="tp-99-1321-g001"></graphic></table-wrap><p>In an effort to find less costly ways of providing HBIG prophylaxis long term, alternative approaches have been studied including the use of low dose intramuscular (IM) HBIG<sup><xref rid="R29" ref-type="bibr">29</xref>,<xref rid="R37" ref-type="bibr">37</xref>,<xref rid="R63" ref-type="bibr">63</xref>-<xref rid="R68" ref-type="bibr">68</xref></sup> subcutaneous HBIG,<sup><xref rid="R70" ref-type="bibr">70</xref>,<xref rid="R73" ref-type="bibr">73</xref>,<xref rid="R74" ref-type="bibr">74</xref></sup> withdrawal of HBIG after a finite period or prophylaxis regimens without HBIG. Combination protocols are heterogeneous with regard to dosing, duration, and routes of HBIG administration (Table <xref ref-type="table" rid="T1">1</xref>). The most cost-effective regimen reported to date is a very low IM HBIG plus LAM regimen.<sup><xref rid="R61" ref-type="bibr">61</xref>,<xref rid="R63" ref-type="bibr">63</xref>,<xref rid="R75" ref-type="bibr">75</xref></sup> Combination prophylaxis with low dose IM HBIG (400‐800 IU IM) decreases costs by more than 90% as compared with an IV regimen, with a recurrence rate as low as 4% at 4 years.<sup><xref rid="R63" ref-type="bibr">63</xref></sup> Hooman et al<sup><xref rid="R75" ref-type="bibr">75</xref></sup> report the result of a crossover study comparing IV and IM HBIG administration in stable liver recipients taking LAM or ADV more than 12 months after LT. They demonstrated comparability of elimination pharmacokinetics of HBIG regardless of the antibody route of administration, maintenance of protective anti-HBs levels, and no significant difference in the elimination characteristics as a function of pretransplant replication status. Taking efficacy and cost-effectiveness into consideration, IM HBIG plus LAM seems to be superior to IV HBIG plus LAM, though there may be a subset of patients (e.g., high HBV DNA before transplantation) who may benefit from the higher doses of HBIG provided by IV route.<sup><xref rid="R63" ref-type="bibr">63</xref></sup> More recently, subcutaneous regimens of HBIG administered 6 months after LT have proven effective as well, with some advantage regarding tolerability and the possibility of self-administration by patients at home.<sup><xref rid="R70" ref-type="bibr">70</xref>,<xref rid="R73" ref-type="bibr">73</xref>,<xref rid="R74" ref-type="bibr">74</xref></sup> Degertekin et al<sup><xref rid="R15" ref-type="bibr">15</xref></sup> analyzed data from 183 patients who had undergone LT between 2001 and 2007. At transplant, 29% of patients were positive for HBeAg, 38.5% had a high viral load (defined as HBV DNA >10<sup>5</sup> copies/mL). After transplantation, all except 6 patients received combination prophylaxis with antiviral therapy (mostly LAM monotherapy) plus HBIG given either IV high-dose (25%, 10,000 IU monthly), IV low-dose (21.5%, 3000‐6000 IU monthly), IM low-dose (39%, 1000‐1500 IU every 1‐2 months), or for a finite duration (14.5%; median duration, 12 months). Cumulative rates of HBV recurrence at 1, 3, and 5 years were 3%, 7%, and 9%, respectively. A multivariate analysis showed that positivity for HBeAg and a high viral load at transplant, but not the posttransplant HBIG regimen, were associated with HBV recurrence.</p><p>Several meta-analyses have compared the use of HBIG, antivirals, or both (Table <xref ref-type="table" rid="T2">2</xref>).<sup><xref rid="R55" ref-type="bibr">55</xref>,<xref rid="R76" ref-type="bibr">76</xref>-<xref rid="R79" ref-type="bibr">79</xref></sup> Despite methodological limitations of studies included in these meta-analyses, combination prophylaxis was significantly superior to antivirals or HBIG alone in preventing HBV recurrence, irrespective of the HBV DNA level at transplantation and in reducing overall and HBV-related mortality in some studies. Cholongitas et al<sup><xref rid="R55" ref-type="bibr">55</xref></sup> found that the combination of HBIG and ADV with or without LAM is more effective than the combination of HBIG and LAM for the prevention of HBV recurrence, which developed in 2% (3/152) and 6.1% (115/1889) of patients, respectively (<italic>P</italic> = 0.024). Among the parameters of HBIG use that were evaluated in this review, only a high dose during the first week after LT was found to be significantly associated with the absence of HBV recurrence. A high HBIG dose (≥10,000 IU/day) versus a low HBIG dose (<10,000 IU/day) during the first week after LT was associated with a lower frequency of HBV recurrence (3.2% vs 6.5%, <italic>P</italic> = 0.016).</p><table-wrap id="T2" position="float"><label>TABLE 2</label><caption><p>Results of meta-analyses comparing combination prophylaxis to HBIG or antiviral monoprophylaxis</p></caption><graphic xlink:href="tp-99-1321-g002"></graphic></table-wrap><p>The optimal HBIG protocol is yet to be defined. Further research is needed to determine the dose and duration of HBIG after LT, appropriate titre levels of anti-HBs to prevent recurrence and whether HBIG can be stopped. The majority of published studies used a combination of HBIG and LAM and/or ADV. The role and the safety of newer nucleos(t)ide analogues with greater potency and better resistance profiles (ETV or TDF) have not yet been adequately evaluated.<sup><xref rid="R65" ref-type="bibr">65</xref>,<xref rid="R79" ref-type="bibr">79</xref>-<xref rid="R81" ref-type="bibr">81</xref></sup> Perrillo et al<sup><xref rid="R81" ref-type="bibr">81</xref></sup> recently assessed the safety and efficacy of ETV combined with various HBIG regimens in 65 transplant patients. Through week 72, all 61 patients evaluable for the efficacy analysis had undetectable HBV DNA. Two patients experienced a reappearance of HBsAg, but both remained HBV DNA negative. In a recent systematic review, Cholongitas et al<sup><xref rid="R79" ref-type="bibr">79</xref></sup> evaluated the efficacy of newer nucleos(t)ide analogues with HBIG as prophylaxis against HBV recurrence. The combination of HBIG and a newer nucleos(t)ide analogue was superior to the combination of HBIG and LAM in reducing the risk of HBV recurrence (1% vs. 6.1%, <italic>P</italic> = 0.0004). The use of newer nucleos(t)ide analogues can effectively be combined with lower HBIG doses.</p></sec><sec><title>Limitations of HBIG</title><p>The use of IV HBIG has limitations, namely, the high cost, parenteral administration, limited supply, need for frequent clinic visits and laboratory monitoring. The IM route of administration is a cost-effective alternative to IV HBIG. However, injection is sometimes painful and local side effects occur. There are some contraindications for IM injections such as coagulopathies or oral anticoagulation medication. Subcutaneous injections improve quality of life by offering greater independence and home self-administration may contribute to decrease costs by avoiding the need for day hospitals. The HBIG has a satisfactory safety record, and adverse events observed have usually been minor. Hypersensitivity reactions or even anaphylaxis rarely occur after HBIG administration and can be controlled with antihistamines or steroids.</p></sec><sec><title>Prophylaxis Protocols With HBIG Discontinuation</title><p>Indefinite combination therapy with HBIG plus a nucleos(t)ide analogue may not be required in all liver transplant recipients. The replication status of the patient before the initiation of antiviral therapy and at the time of LT should guide prophylaxis. Alternative strategies to consider, especially in patients without detectable HBV DNA before transplantation are the discontinuation of HBIG after a defined period of time and continuing treatment with antivirals alone, or adding HBsAg vaccination or both.</p><p>Studies of hepatitis B vaccination as an alternative to long-term HBIG in LT recipients were conducted in patients who were serum HBV DNA-negative before LT, and during a prolonged time post-LT, who received low doses of immunosuppression, and were HBV DNA-negative by PCR at the start of vaccination.<sup><xref rid="R82" ref-type="bibr">82</xref>-<xref rid="R90" ref-type="bibr">90</xref></sup> Anti-HBs titres achieved with the vaccination are highly variable and seem in part dependant on the type of vaccine: booster doses, double-dose third generation recombinant vaccines, addition of an adjuvant. Patient populations, as well as vaccine types, doses, schedules of administration, and definitions of response differed across these studies. From these data, it seems clear that successful hepatitis B vaccination and discontinuation of HBIG are feasible only in a small group of selected patients but the optimal vaccine protocol has not been established.</p><p>Two studies evaluated the efficacy of long-term HBIG monotherapy versus HBIG followed by LAM monotherapy in patients selected on the basis of a low risk of HBV reinfection.<sup><xref rid="R91" ref-type="bibr">91</xref>,<xref rid="R92" ref-type="bibr">92</xref></sup> At 1 year after the discontinuation of HBIG, the HBV reinfection rates were not significantly different; however, HBV DNA was detected by PCR in the serum of some patients without HBV recurrence. This latter finding suggests caution with this approach and the need for studies with a longer follow-up and other antiviral therapy. Another strategy is HBIG withdrawal after a defined period of combination prophylaxis (Table <xref ref-type="table" rid="T3">3</xref>).<sup><xref rid="R1" ref-type="bibr">1</xref>,<xref rid="R23" ref-type="bibr">23</xref>,<xref rid="R93" ref-type="bibr">93</xref>-<xref rid="R103" ref-type="bibr">103</xref></sup> In a study of 29 patients, high-dose HBIG and LAM were used in the first month, and patients were then randomized to receive either LAM monotherapy or LAM plus IM HBIG at 2000 IU monthly.<sup><xref rid="R93" ref-type="bibr">93</xref></sup> None of the patients developed HBV recurrence during the first 18 months but later recurrences developed in 4 patients after 5 years of follow-up related with poor LAM compliance.<sup><xref rid="R94" ref-type="bibr">94</xref></sup> Wong et al<sup><xref rid="R95" ref-type="bibr">95</xref></sup> reported that HBV recurrence rates were 0% and 9% at 2 and 4 years after HBIG discontinuation. In a prospective study of 29 patients, sequential ETV monotherapy after planned discontinuation of 1-year combination therapy of IV HBIG and ETV was assessed and then followed up for 1 additional year.<sup><xref rid="R102" ref-type="bibr">102</xref></sup> After the first 12 months, HBIG was discontinued if: liver function test within the normal range 3 times; no steroid medication; and negative HBsAg and DNA. During the first year, no HBV recurrence was reported and during the second year, HBV recurrence was noted in only 1 patient related with HCC recurrence without viral mutation. Tanaka et al<sup><xref rid="R103" ref-type="bibr">103</xref></sup> conducted a retrospective study on 24 patients who received TDF (± LAM) and one year of low dose HBIG to prevent recurrent HBV infection. None of the patients developed recurrent HBV infection in the median follow-up period of 29.1 months (neither HBsAg nor HBV DNA levels detectable).<sup><xref rid="R103" ref-type="bibr">103</xref></sup> An alternative approach is to switch from HBIg/LAM to a combination of antiviral agents that present a greater barrier to the development of resistance than LAM. In a randomized prospective study, 16 of 34 patients receiving low-dose IM HBIG/LAM prophylaxis who were at least 12 months after LT were switched to ADV/LAM combination therapy, whereas the remaining patients continued HBIG/LAM.<sup><xref rid="R97" ref-type="bibr">97</xref></sup> At a median follow-up of 21 months after the switch, no patient had disease recurrence, although 1 patient in the ADV/LAM group had a low titre of HBsAg in serum but was repeatedly HBV DNA-negative. The same group has recently reported the outcome of 20 patients with an HBIG-sparing regimen using LAM + ADV initiated at the time of listing and continued after LT.<sup><xref rid="R100" ref-type="bibr">100</xref></sup> Eight hundred IU of IM HBIG were given immediately after LT and daily during 7 days. After a median follow-up of 57 months post-LT, only 1 patient became HBsAg-positive (HBV DNA negative) at the time of HCC recurrence. Serum HBsAg became undetectable again after surgical treatment of HCC recurrence. Saab et al<sup><xref rid="R98" ref-type="bibr">98</xref></sup> switched 61 liver transplant recipients to a combination of a nucleoside (LAM or ETV) and nucleotide analogue (ADV or TDV). At a median follow-up of 15 months after the switch, 2 patients were HBsAg-positive in serum but repeatedly HBV DNA-negative. Recently, Teperman et al<sup><xref rid="R99" ref-type="bibr">99</xref></sup> evaluated the use of a combination of TDV with emtricitabine after HBIG discontinuation. In this study, subjects at a median of 3.4 years after LT, were treated with a combination of Emtricitabine/TDV and HBIG for 24 weeks and then randomized to continue this prophylaxis regimen (n = 19) or to discontinue HBIG (n = 18). At 72 weeks after randomization, only 1 patient in the Emtricitabine/TDV group had a transient detectability of HBV DNA related to poor compliance. Several studies demonstrated cases of seroconversion to positive HBsAg associated with undetectable HBV DNA (Table <xref ref-type="table" rid="T3">3</xref>).<sup><xref rid="R95" ref-type="bibr">95</xref>,<xref rid="R97" ref-type="bibr">97</xref>,<xref rid="R98" ref-type="bibr">98</xref>,<xref rid="R100" ref-type="bibr">100</xref></sup> A proposed mechanism for this is that HBsAg was being produced at low levels during HBIG therapy and became detectable after HBIG cessation. Longer follow-up of these patients is necessary to determine whether they will clear HBsAg or whether they are at future risk of viral breakthrough.</p><table-wrap id="T3" position="float"><label>TABLE 3</label><caption><p>Prevention of HBV recurrence after liver transplantation with HBIG discontinuation and long-term antiviral therapy</p></caption><graphic xlink:href="tp-99-1321-g003"></graphic></table-wrap><p>Duration of HBIG in HBIG withdrawal strategies is variable across centers and has not yet been established (Table <xref ref-type="table" rid="T3">3</xref>). In several studies, HBIG were stopped at 1 year after LT; however, some studies report durations of HBIG as short as 7 days or 1 month with favorable results.<sup><xref rid="R93" ref-type="bibr">93</xref>,<xref rid="R100" ref-type="bibr">100</xref>,<xref rid="R101" ref-type="bibr">101</xref></sup> Saab et al<sup><xref rid="R104" ref-type="bibr">104</xref></sup> compared costs and outcomes of 2 strategies for HBV prophylaxis after 1 year after LT. The first strategy consisted of prophylaxis with LAM and ADV, whereas the second consisted of monthly IM HBIG and LAM. After 10 years of therapy, the decision analysis model resulted in cost savings of approximately 10 % with the first strategy.</p><p>Drug compliance during long-term antiviral therapy may be a very important issue for transplant patients who feel healthy but have a lifelong risk of HBV recurrence. Safety data on the long-term use of ETV or TDV in transplant recipients are lacking. Consideration must be given to potential side effects: nephrotoxicity associated with TDV may be enhanced in transplant patients on calcineurin inhibitor therapy, risk of decreased bone density with TDV, and mitochondrial toxicity associated with ETV.</p><p>An ultimate approach was to evaluate the safety of complete and sustained prophylaxis withdrawal in liver transplant recipients at a low risk of HBV recurrence. Lenci et al<sup><xref rid="R23" ref-type="bibr">23</xref></sup> evaluated a cohort of 30 patients at a low risk of recurrence (HBeAg and HBV DNA negative at LT, 23% HDV coinfected) and treated with a combination of HBIG and LAM (+/− ADV) for at least 3 years. Sequential liver biopsies were performed and evaluated for the presence of intrahepatic total HBV DNA and cccDNA. Using the absence of intrahepatic total HBV DNA and cccDNA as a guide, HBIG and then antiviral therapy was withdrawn in a stepwise fashion. After a median of 28.7 months off all prophylactic therapy, 83% of the cohort remained without serologic recurrence of HBV infection. Five patients developed HBsAg recurrence but only 1 patient showed evidence of HBV disease (HBV DNA positive), in the other patients, HBsAg positivity was transient. Twenty-three of the 25 subjects without recurrence never had detectable HBV DNA in liver biopsies, whereas all 5 patients with recurrence had evidence of total HBV DNA in the liver and one had detected cccDNA. However, the ability to measure total HBV DNA and cccDNA in a liver biopsy has limitations: this strategy requires sequential liver biopsies and assays for quantification of total HBV DNA and cccDNA are not standardized.</p><p>The studies available to date highlight several key issues to consider before the discontinuation of HBIG after transplantation: First, the risk of HBV recurrence after cessation of HBIG may increase with time off HBIG either due to the development of viral resistance or due to noncompliance to antiviral therapy, and the role of antiviral combinations or antivirals, such as ETV or TDV with a high genetic barrier to resistance, should be better evaluated. Second, the patients with high levels of HBV DNA at the time of transplantation appear to be a higher risk group for recurrence when HBIG is discontinued. Third, HBV DNA persists in serum, liver, or peripheral blood mononuclear cells even 10 years after LT in a proportion of HBV-transplanted patients who are HBsAg-negative. These reservoirs may be a source of future HBV reinfection and therefore support the use of long-term prophylactic therapy in most patients.<sup><xref rid="R17" ref-type="bibr">17</xref>,<xref rid="R18" ref-type="bibr">18</xref>,<xref rid="R21" ref-type="bibr">21</xref></sup> Fourth, we currently lack the ability to identify patients who may have cleared HBV after transplantation.</p></sec><sec><title>HBIG-Free Prophylactic Regimens</title><p>Lamivudine has been evaluated as a prophylactic monotherapy, the drug being started before transplantation and continued after transplantation without HBIG. The outcome at 1 year showed a 10% recurrence rate.<sup><xref rid="R38" ref-type="bibr">38</xref></sup> However, with longer follow-up, rates of recurrence reached 20% to 41% at 3 years after LT (Table <xref ref-type="table" rid="T4">4</xref>).<sup><xref rid="R5" ref-type="bibr">5</xref>,<xref rid="R29" ref-type="bibr">29</xref>,<xref rid="R38" ref-type="bibr">38</xref>-<xref rid="R41" ref-type="bibr">41</xref>,<xref rid="R105" ref-type="bibr">105</xref></sup> Recurrence was due to the emergence of escape mutations in the YMDD motif of the polymerase gene and was observed mainly in patients with a high level of HBV replication before drug exposure. By reserving LAM monoprophylaxis for patients without viral replication at the time of LT, rates of recurrence can be lowered to less than 20%.<sup><xref rid="R107" ref-type="bibr">107</xref></sup> Because prophylactic therapy using LAM alone was associated with unacceptably high rates of reinfection in patients with a high level of viral replication before drug exposure, most transplant programs do not use LAM monotherapy for prophylaxis. Schiff et al<sup><xref rid="R6" ref-type="bibr">6</xref></sup> reported 61 LAM-resistant patients treated with ADV on the waiting list who underwent LT. Sixty percent of these patients received HBIG and ADV combination prophylaxis after LT and 40% ADV ± LAM prophylaxis. Interestingly, no patient in either group had recurrent HBV infection defined as 2 or more positive test results for HBsAg or for HBV DNA; follow-up, however, was short (18 months). These studies showed the limitations of antiviral monoprophylaxis using LAM or ADV (Table <xref ref-type="table" rid="T4">4</xref>).<sup><xref rid="R106" ref-type="bibr">106</xref></sup> The emergence of drug resistance before or after LT limits the efficacy of treatment. The HBV DNA levels at the time of transplantation are related to pretreatment HBV DNA levels and duration of therapy, and influence the risk of recurrence. Recently, Gane et al<sup><xref rid="R100" ref-type="bibr">100</xref></sup> reported the results of a combination prophylaxis using LAM and ADV without HBIG in 18 patients who had documented suppression of HBV DNA below 3 log<sub>10</sub> IU/mL before LT. No case of HBV recurrence was observed after a median follow-up of 22 months. The combination of LAM and ADV is cost-effective as compared to low-dose IM HBIG and LAM ($8290 vs $13718 per year). The availability of more potent antivirals with a higher barrier to resistance could increase the proportion of patients with undetectable HBV DNA before transplantation and decrease the risk of recurrent disease after transplantation.<sup><xref rid="R1" ref-type="bibr">1</xref></sup> Wadhawan et al<sup><xref rid="R108" ref-type="bibr">108</xref></sup> reported on 56 living donor recipients who received various antivirals before transplantation (LAM + ADV n = 17, ETV n = 25, TDV n = 8, ETV + TDV n = 2). Forty-seven of 56 patients achieved a HBV DNA level below 2000 IU/mL before transplant and did not receive HBIG. All were HBV DNA undetectable after a median follow-up of 20 months after transplantation. Fung et al<sup><xref rid="R43" ref-type="bibr">43</xref></sup> investigated the efficacy of ETV as monoprophylaxis in 80 patients with chronic hepatitis B who received a liver transplant. A total of 18 patients (22.5%) had persistent HBsAg positivity after transplant without seroclearance (n = 8) or reappearance of HBsAg after initial seroclearance (n = 10). Seventeen patients had undetectable levels of HBV DNA at the time of the last follow-up. The remaining patient had a very low HBV DNA level of 217 copies/mL at 36 months after LT. The pre-LT HBsAg level was significantly higher in those who had HBV recurrence/persistence compared with those who did not. In this study, as compared with the study of Gane et al,<sup><xref rid="R100" ref-type="bibr">100</xref></sup> the median pre-LT HBV DNA level was much higher (3.6 log<sub>10</sub> IU/ml versus 1.9 log<sub>10</sub> IU/mL), the rate of HBsAg clearance after LT was much slower with a median time to HBsAg loss of 4 weeks versus 1 week, and the 12-month cumulative rate of HBsAg loss was 88% versus 100%.</p><table-wrap id="T4" position="float"><label>TABLE 4</label><caption><p>Prevention of HBV recurrence with antiviral(s) before and after liver transplantation</p></caption><graphic xlink:href="tp-99-1321-g004"></graphic></table-wrap><p>Regarding the long-term results, Fung et al<sup><xref rid="R105" ref-type="bibr">105</xref></sup> reported a study conducted on a large population of 362 CHB patients who underwent LT, of which 176 (49% ), 142 (39% ), and 44 (12%) were on LAM, ETV, and combination therapy (predominantly LAM + ADV), respectively, without HBIG. The rate of HBsAg seronegativity and HBV DNA suppression to undetectable levels at 8 years was 88% and 98%, respectively and the overall 8-year survival was 83%, with no difference between the 3 treatment groups. The virological relapse rates, defined as greater than 1 log IU/mL increase of HBV DNA level from nadir, was 5%, 10%, 13%, and 16% at 1, 3, 5, and 8 years. The virological rebound for LAM, combination therapy, and ETV was 17%, 7%, and 0%, respectively, at 3 years. One patient required retransplantation because of fibrosing cholestatic hepatitis from HBV recurrence. Using multivariate analysis, the type of antiviral therapy, the indication for LT, and the viral load at the time of LT remained significant factors associated with virological rebound. Recently, Takaki et al<sup><xref rid="R53" ref-type="bibr">53</xref></sup> reviewed the post-LT HBV prophylaxis with nucleos(t)ide analogues and/or HBIG. They established that a complete HBIG-free protocol may impose a risk for patients with high levels of HBV DNA at the time of LT but may be adopted for patients who are HBV DNA-negative at the time of LT. Further large and long-term studies are required to decide whether other antivirals, such as TDV or a combination of antivirals without HBIG, would provide effective prophylaxis.</p></sec><sec><title>Guidelines and Future Prospects for Prevention of HBV Reinfection</title><p>Viral suppression is the goal for all patients on a waiting list. For patients without detectable viral replication before transplantation, there is no evidence that preoperative antiviral therapy is useful. For patients with viral replication before transplantation, ETV, TDV or a nucleoside/nucleotide combination should be used. There is a consensus regarding the need for a lifelong prophylactic therapy supported by the detection of HBV DNA in both hepatic and extrahepatic sites in patients who are HBsAg negative on posttransplant HBIG and antivirals. In the early posttransplant period, some studies reported that a high IV HBIG dose (≥10,000 IU/day) versus a low HBIG dose (<10,000 IU/day) was associated with a lower frequency of HBV recurrence. At long-term, low-dose IM or subcutaneous HBIG in combination with a potent nucleos(t)ide analogue is the most cost-effective prophylaxis. Patients with an undetectable HBV DNA level at the time of transplant are eligible for protocols using short-term low dose IV or IM HBIG and antiviral therapy, followed by antiviral monotherapy (Figure <xref ref-type="fig" rid="F1">1</xref>). A more cautious approach to this prophylactic regimen is necessary for those patients with high pretransplant HBV DNA levels, those with limited antiviral options if HBV recurrence occurred (i.e., HIV or HDV coinfection, preexisting drug resistance or intolerance), those with a high risk of HCC recurrence and those with a risk of noncompliance with antiviral therapy. In this group, HBIG-free prophylaxis cannot be recommended.</p><fig id="F1" position="float"><label>FIGURE 1</label><caption><p>Prophylaxis for prevention of HBV graft recurrence after LT. Proposal for guideline.</p></caption><graphic xlink:href="tp-99-1321-g005"></graphic></fig></sec></sec><sec sec-type="conclusions"><title>CONCLUSIONS</title><p>During the past 2 decades, major advances have been made in the management of HBV transplant candidates. The HBIG administration and antiviral drugs used before and after transplantation, as a prophylaxis of HBV recurrence, were major breakthroughs in the management of patients. The combination of long-term antivirals and low-dose HBIG can effectively prevent HBV recurrence in greater than 90% of transplant recipients. Some form of HBV prophylaxis needs to be continued indefinitely after transplantation. However, in patients with low HBV DNA levels before transplantation, discontinuation of HBIG, with continued long-term nucleos(t)ide analogue(s) treatment is possible.</p></sec></body><back><fn-group><fn fn-type="supported-by"><p>This review article was supported by LFB Biomedicaments, producer and marketer of human hepatitis B immunoglobulin.</p></fn><fn fn-type="conflict"><p>The authors declare no conflicts of interest.</p></fn><fn fn-type="other"><p>Each author participated in the writing of the article.</p></fn></fn-group><ref-list><title>REFERENCES</title><ref id="R1"><label>1</label><mixed-citation publication-type="journal"><person-group><name><surname>Fox</surname><given-names>AN</given-names></name><name><surname>Terrault</surname><given-names>NA</given-names></name></person-group><article-title>The option of HBIG-free prophylaxis against recurrent HBV</article-title>.
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