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including TNF&#945; inhibitors&#46; This risk is highly depends on the agent&#39;s target and mechanism of action&#46;<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;5</span></a> Although it is accepted that TNF&#945; inhibitors may lead to HBV reactivation in these patients&#44; the reactivation rates are much lower when compared to HBsAg positive patients&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> The prevalence of patients with past HBV &#40;9&#37;&#41; found in this study was similar to other published studies in patients with IMIDs&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a> A systematic review including 168 anti-HBc positive&#47;HBsAg negative patients with RA&#44; spondyloarthropathies&#44; psoriasis and IBD found HBV reactivation 5&#46;4&#37; of patients<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> while a meta-analysis including 468 anti-HBc positive&#47;HBsAg negative patients treated with TNF&#945; inhibitors for rheumatologic diseases&#44; HBV reactivation was observed in 1&#46;7&#37; with a percentage of HBV reactivation ranging from 0 to 8&#46;3&#37;&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">2</span></a> As seen in other studies&#44; including with patients with psoriasis&#44; no cases of HBV reactivation were observed in this study&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">7&#44;8</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">All patients that had HBV DNA measured during screening&#44; maintained their levels below detection threshold during follow-up &#40;measured every 6 months for 2 years and then yearly&#41;&#46; However&#44; detectable baseline viral loads have been found in this subset of patients&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">9</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">The title of anti-HBs may influence the risk of reactivation of HBV&#46;<span class="elsevierStyleSup">9</span> In this study&#44; 73&#46;1&#37; patients were anti-HBs positive in the pre-treatment screening&#44; and may have been important decreasing the risk of HBV reactivation&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">The main limitation of this study is its retrospective nature and the small and heterogenic sample&#44; the long period of inclusion &#40;as intra-hospital and international recommendations has changed along time&#41; and the inexistence of HBV DNA data for some of the anti-HBc positive&#47;HBsAg negative patients &#40;preventing to determine HBV occult infection&#41;&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">Current guidelines state that candidates for chemotherapy and immunosuppressive therapy who are anti-HBc positive&#47;HBsAg negative&#44; regardless of anti-HBs status and with undetectable serum HBV-DNA should be followed carefully by means of ALT and HBV-DNA testing and treated with nucleotide analogs therapy only upon confirmation of HBV reactivation before ALT elevation&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">10</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">Treatment with anti-TNF&#945; agents is safe in anti-HBc positive&#47;HBsAg negative patients&#46; HBV reactivation is probably related to the presence of HBV in circulation rather than to the serologic status of previous exposure&#46; Nonetheless&#44; and as expressed in current guidelines&#44; screening for HBV serologic markers prior to initiation of anti-TNF&#945; therapy is of major importance since it may dictate if prophylactic treatment&#44; vaccination or monitoring should be taken to minimize the risks related to hepatitis B flare&#47;reactivation&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflict of interests</span><p id="par0060" class="elsevierStylePara elsevierViewall">Rui Pereira&#44; In&#234;s Lobo and Filipe Nery have no conflicts of interest to disclosure&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">Tiago Torres has participated in clinical trials sponsored by AbbVie&#44; Amgen&#44; and Novartis and has received honoraria for acting as a consultant and&#47;or as a speaker at events sponsored by AbbVie&#44; Boehringer Ingelheim&#44; Celgene&#44; Janssen&#44; Leo-Pharma&#44; Eli-Lilly&#44; MSD&#44; Novartis&#44; and Pfizer&#46;</p></span></span>"
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          "leyenda" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">CD&#44; Chron&#39;s disease&#59; RA&#44; rheumatoid arthritis&#59; AS&#44; ankylosing spondylitis&#59; Ps&#44; psoriasis&#59; PsA&#44; psoriatic arthritis&#59; TNF&#44; tumor necrosis factor&#59; MTX&#44; methotrexate&#59; AZA&#44; azathioprine&#59; CsA&#44; cyclosporine A&#59; CS&#44; corticosteroids&#46;</p>"
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                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><tbody title="tbody"><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleItalic">Patients</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">26 &#40;100&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleItalic">Female gender&#44; N &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">10 &#40;38&#46;5&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleItalic">Age in years&#44; mean</span><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">&#177;</span><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">SD</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">52&#46;65<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>14&#46;12&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " colspan="2" align="left" valign="top"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleItalic">Disease duration in years&#44; mean</span><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">&#177;</span><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">SD</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">19&#46;16<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>11&#46;92&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>CD&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">9 &#40;34&#46;6&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>RA&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4 &#40;15&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>AS&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4 &#40;15&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Ps<span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span>PsA&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">6 &#40;23&#46;1&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Ps&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">3 &#40;11&#46;5&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " colspan="2" align="left" valign="top"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="table-entry  " colspan="2" align="left" valign="top"><span class="elsevierStyleItalic">Therapy</span></td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Anti-TNF&#945;&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">26 &#40;100&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Etanercept&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">12 &#40;46&#46;2&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Adalimumab&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">8 &#40;30&#46;8&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Infliximab&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">6 &#40;23&#46;1&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Switch&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">7 &#40;26&#46;9&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Combined therapy&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">13 &#40;50&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">7 &#40;26&#46;9&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>AZA&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4 &#40;15&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>CsA&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1 &#40;3&#46;8&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>CS&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4 &#40;15&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " colspan="2" align="left" valign="top"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="table-entry  " colspan="2" align="left" valign="top"><span class="elsevierStyleItalic">Treatment duration in years</span></td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Etanercept&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">3&#46;1&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Adalimumab&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Infliximab&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4&#46;9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
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Case and Research Letter
Risk of hepatitis B virus reactivation in patients treated with anti-TNFα agents for immune-mediated inflammatory diseases
Riesgo de reactivación de la hepatitis B en los pacientes tratados con agentes anti-TNFα para enfermedades inflamatorias inmuno-mediadas
R. Pereiraa, I. Raposob, F. Nerya,c, T. Torresa,b,
Autor para correspondencia
torres.tiago@outlook.com

Corresponding author.
a Instituto de Ciências Biomédicas Abel Salazar, University of Porto, Portugal
b Department of Dermatology, Centro Hospitalar do Porto, Portugal
c Hepato-Pancreatic Unit, Centro Hospitalar do Porto, Porto, Portugal
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        "titulo" => "Riesgo de reactivaci&#243;n de la hepatitis B en los pacientes tratados con agentes anti-TNF&#945; para enfermedades inflamatorias inmuno-mediadas"
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">TNF&#945; inhibitors revolutionized the treatment of immune-mediated inflammatory diseases &#40;IMIDs&#41;&#46; Due to their immunosuppressive nature&#44; these therapies increase susceptibility for new infections and may alter the natural course of latent infections&#46;<a class="elsevierStyleCrossRefs" href="#bib0055"><span class="elsevierStyleSup">1&#44;2</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Occult HBV infection is defined as the persistence of viral genome in the liver tissue of individuals serologically negative for HBV surface antigen &#40;HBsAg&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> Patients with positive antibodies to HBV core antigen &#40;anti-HBc&#41; and negative HBsAg and HBV-DNA&#44; with or without antibodies to HBV surface antigen &#40;anti-HBs&#41; are potential occult HBV carriers<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> and may reactivate under immunosuppressive therapy&#46;<a class="elsevierStyleCrossRefs" href="#bib0055"><span class="elsevierStyleSup">1&#44;2</span></a> Studies in subjects with past HBV infection treated with anti-TNF&#945; therapy for inflammatory bowel disease &#40;IBD&#41; and rheumatic diseases estimated a reactivation rate between 1&#46;7&#37; and 5&#37; of patients&#46;<a class="elsevierStyleCrossRefs" href="#bib0055"><span class="elsevierStyleSup">1&#44;2</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">The aim of this retrospective study was to evaluate the rate of reactivation in anti-HBc positive&#47;HBsAg negative patients treated with TNF&#945; inhibitors for psoriasis&#44; rheumatologic diseases and IBD&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Patients treated with TNF&#945; inhibitors for IMIDs from January 2000 to December 2014&#44; for at least one month were retrospectively included&#46; Information regarding patients&#8217; HBV screening serology &#40;HBsAg&#44; anti-HBc and anti-HBs antibodies&#41; and HBV-DNA &#40;in anti-HBc positive patients&#41; prior to the initiation of TNF&#945; inhibitors as well as HBsAg seroconversion&#44; HBV-DNA <span class="elsevierStyleItalic">de novo</span> detection and ALT&#47;AST levels during anti-TNF therapy were collected&#46; HBV reactivation was defined as titer elevation up to 2&#8211;3 times the upper limit of normal ALT&#44; in combination with <span class="elsevierStyleItalic">de novo</span> detection of HBV-DNA or HBsAg seroconversion&#46; Furthermore&#44; patients&#8217; demographic&#44; clinical and therapeutic characteristics were recorded&#46; This study was approved by the hospital&#39;s Institutional Review Board&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">From 389 patients treated with TNF&#945; inhibitors during the study period&#44; 26 &#40;9&#37;&#41; patients were anti-HBc positive&#47;HBsAg negative and one patient presented with a serologic profile compatible with chronic hepatitis B&#46; The mean observation time was 43&#46;6<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>28&#46;7 months&#46; Subjects&#8217; demographic and clinical data are reported in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#46; Nineteen &#40;73&#46;1&#37;&#41; patients were anti-HBs positive in the pre-treatment screening&#46; HBV-DNA levels were available in 7 &#40;26&#46;9&#37;&#41; patients&#44; being undetectable in all of them&#46; Additionally&#44; during follow-up&#44; HBV-DNA levels were measured in 7 additional patients &#40;that had not been measured before treatment&#41; amounting to 53&#46;8&#37; patients with undetectable HBV-DNA levels&#46; In these patients&#44; HBV-DNA levels were measured every 6months for a 2-years period&#46; No rise of the aminotransferases values was observed in any patient during follow-up&#46; At the end of the observational period&#44; no case of reactivation was observed regardless of anti-HBs positivity&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0030" class="elsevierStylePara elsevierViewall">Patients with past HBV infection &#40;anti-HBc positive&#47;HBsAg negative patients&#41; can arbor an occult infection&#44; and be susceptible to reactivation when exposed to immunosuppression&#44; including TNF&#945; inhibitors&#46; This risk is highly depends on the agent&#39;s target and mechanism of action&#46;<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;5</span></a> Although it is accepted that TNF&#945; inhibitors may lead to HBV reactivation in these patients&#44; the reactivation rates are much lower when compared to HBsAg positive patients&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> The prevalence of patients with past HBV &#40;9&#37;&#41; found in this study was similar to other published studies in patients with IMIDs&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a> A systematic review including 168 anti-HBc positive&#47;HBsAg negative patients with RA&#44; spondyloarthropathies&#44; psoriasis and IBD found HBV reactivation 5&#46;4&#37; of patients<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> while a meta-analysis including 468 anti-HBc positive&#47;HBsAg negative patients treated with TNF&#945; inhibitors for rheumatologic diseases&#44; HBV reactivation was observed in 1&#46;7&#37; with a percentage of HBV reactivation ranging from 0 to 8&#46;3&#37;&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">2</span></a> As seen in other studies&#44; including with patients with psoriasis&#44; no cases of HBV reactivation were observed in this study&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">7&#44;8</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">All patients that had HBV DNA measured during screening&#44; maintained their levels below detection threshold during follow-up &#40;measured every 6 months for 2 years and then yearly&#41;&#46; However&#44; detectable baseline viral loads have been found in this subset of patients&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">9</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">The title of anti-HBs may influence the risk of reactivation of HBV&#46;<span class="elsevierStyleSup">9</span> In this study&#44; 73&#46;1&#37; patients were anti-HBs positive in the pre-treatment screening&#44; and may have been important decreasing the risk of HBV reactivation&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">The main limitation of this study is its retrospective nature and the small and heterogenic sample&#44; the long period of inclusion &#40;as intra-hospital and international recommendations has changed along time&#41; and the inexistence of HBV DNA data for some of the anti-HBc positive&#47;HBsAg negative patients &#40;preventing to determine HBV occult infection&#41;&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">Current guidelines state that candidates for chemotherapy and immunosuppressive therapy who are anti-HBc positive&#47;HBsAg negative&#44; regardless of anti-HBs status and with undetectable serum HBV-DNA should be followed carefully by means of ALT and HBV-DNA testing and treated with nucleotide analogs therapy only upon confirmation of HBV reactivation before ALT elevation&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">10</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">Treatment with anti-TNF&#945; agents is safe in anti-HBc positive&#47;HBsAg negative patients&#46; HBV reactivation is probably related to the presence of HBV in circulation rather than to the serologic status of previous exposure&#46; Nonetheless&#44; and as expressed in current guidelines&#44; screening for HBV serologic markers prior to initiation of anti-TNF&#945; therapy is of major importance since it may dictate if prophylactic treatment&#44; vaccination or monitoring should be taken to minimize the risks related to hepatitis B flare&#47;reactivation&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflict of interests</span><p id="par0060" class="elsevierStylePara elsevierViewall">Rui Pereira&#44; In&#234;s Lobo and Filipe Nery have no conflicts of interest to disclosure&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">Tiago Torres has participated in clinical trials sponsored by AbbVie&#44; Amgen&#44; and Novartis and has received honoraria for acting as a consultant and&#47;or as a speaker at events sponsored by AbbVie&#44; Boehringer Ingelheim&#44; Celgene&#44; Janssen&#44; Leo-Pharma&#44; Eli-Lilly&#44; MSD&#44; Novartis&#44; and Pfizer&#46;</p></span></span>"
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          "leyenda" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">CD&#44; Chron&#39;s disease&#59; RA&#44; rheumatoid arthritis&#59; AS&#44; ankylosing spondylitis&#59; Ps&#44; psoriasis&#59; PsA&#44; psoriatic arthritis&#59; TNF&#44; tumor necrosis factor&#59; MTX&#44; methotrexate&#59; AZA&#44; azathioprine&#59; CsA&#44; cyclosporine A&#59; CS&#44; corticosteroids&#46;</p>"
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                  <table border="0" frame="\n
                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><tbody title="tbody"><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleItalic">Patients</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">26 &#40;100&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleItalic">Female gender&#44; N &#40;&#37;&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">10 &#40;38&#46;5&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleItalic">Age in years&#44; mean</span><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">&#177;</span><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">SD</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">52&#46;65<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>14&#46;12&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " colspan="2" align="left" valign="top"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleItalic">Disease duration in years&#44; mean</span><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">&#177;</span><span class="elsevierStyleHsp" style=""></span><span class="elsevierStyleItalic">SD</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">19&#46;16<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>11&#46;92&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>CD&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">9 &#40;34&#46;6&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>RA&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4 &#40;15&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>AS&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4 &#40;15&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Ps<span class="elsevierStyleHsp" style=""></span>&#43;<span class="elsevierStyleHsp" style=""></span>PsA&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">6 &#40;23&#46;1&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Ps&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">3 &#40;11&#46;5&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " colspan="2" align="left" valign="top"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="table-entry  " colspan="2" align="left" valign="top"><span class="elsevierStyleItalic">Therapy</span></td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Anti-TNF&#945;&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">8 &#40;30&#46;8&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Infliximab&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">7 &#40;26&#46;9&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>AZA&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4 &#40;15&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>CsA&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">1 &#40;3&#46;8&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>CS&#44; <span class="elsevierStyleItalic">N</span> &#40;&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4 &#40;15&#46;4&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " colspan="2" align="left" valign="top"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="table-entry  " colspan="2" align="left" valign="top"><span class="elsevierStyleItalic">Treatment duration in years</span></td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Etanercept&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Adalimumab&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4&#46;2&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="table-entry  " align="left" valign="top"><span class="elsevierStyleHsp" style=""></span>Infliximab&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="table-entry  " align="char" valign="top">4&#46;9&nbsp;\t\t\t\t\t\t\n
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                      "titulo" => "Hepatitis B virus reactivation in patients receiving tumor necrosis factor &#40;TNF&#41;-targeted therapy&#58; analysis of 257 cases"
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                            0 => "R&#46; P&#233;rez-Alvarez"
                            1 => "C&#46; D&#237;az-Lagares"
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ISSN: 00017310
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