<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0034-7523</journal-id>
<journal-title><![CDATA[Revista Cubana de Medicina]]></journal-title>
<abbrev-journal-title><![CDATA[Rev cubana med]]></abbrev-journal-title>
<issn>0034-7523</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias MédicasEditorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-75232014000400010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Asociación entre hepatitis crónica por virus C y linfoma no Hodgkin de células B]]></article-title>
<article-title xml:lang="en"><![CDATA[Association between chronic hepatitis C virus infection and non-Hodgkin B cell lymphoma]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dorta Guridi]]></surname>
<given-names><![CDATA[Zaily]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arús Soler]]></surname>
<given-names><![CDATA[Enrique Rogelio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calzadilla Bertot]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto de Gastroenterología  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2014</year>
</pub-date>
<volume>53</volume>
<numero>4</numero>
<fpage>468</fpage>
<lpage>477</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-75232014000400010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-75232014000400010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-75232014000400010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se estima que unos 170 millones de personas están infectadas por el virus de la hepatitis C (VHC) en todo el mundo. La persistencia del virus en el organismo es consecuencia de su capacidad de mutar y de las alteraciones en la respuesta inmunológica que produce. Existen teorías que relacionan este virus con la linfomagénesis. El riesgo relativo de que pacientes infectados con el VHC padezcan linfoma no Hodgkin (LNH) es de 2 a 4 veces mayor que en los sujetos no infectados. Esta asociación tiene variabilidad geográfica: los países donde esa asociación es mayor son Italia, Japón y Estados Unidos, y donde es menor son Canadá y los del norte de Europa. El linfoma de la zona marginal de células B y el linfoplasmocitico son los más reportados en asociación con el VHC. Los LNH indolentes asociados con el VHC pueden ser tratados con terapia antiviral, no así las formas agresivas que necesitan de inmunoquimioterapia específica. Se ha demostrado que la hepatitis C es un significativo factor de riesgo para la toxicidad hepática en los pacientes que necesitan quimioterapia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[170 million people are estimated to be infected with hepatitis C virus (HCV) worldwide. The persistence of the virus in the body is due to its ability to mutate and alterations in the immune response that occurs. There are theories linking this virus lymphoma genesis. The relative risk of HCV-infected patients suffering from non-Hodgkin lymphoma is 2-4 times higher than in uninfected subjects. This association has geographic variability. Countries where the association is stronger are Italy, Japan, and the United States, and it is lesser in Canada and northern Europe. Lymphoma of the marginal zone in B cells and lymphoplasmacytic are the most well-informed in association with HCV. Indolent non-Hodgkin lymphomas associated with HCV can be treated with antiviral therapy, but the aggressive forms require specific immunochemotherapy. Hepatitis C has been shown to be a significant risk factor for hepatic toxicity in patients needing chemotherapy.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[hepatitis crónica por virus C]]></kwd>
<kwd lng="es"><![CDATA[linfoma no Hodgkin]]></kwd>
<kwd lng="en"><![CDATA[chronic hepatitis C virus]]></kwd>
<kwd lng="en"><![CDATA[non-Hodgkin lymphoma (NHL)]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana"><b>TEMA ACTUALIZADO</b></font></p>     <p>&nbsp; </p>     <p> <font size="2" face="Verdana"><b><font size="4">Asociaci&#243;n entre hepatitis    cr&#243;nica por virus C y linfoma no Hodgkin de c&#233;lulas B</font></b> </font></p>     <p>&nbsp;</p>     <p><b><font size="3" face="Verdana">Association between chronic hepatitis C virus    infection and non-Hodgkin B cell lymphoma </font></b></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Ms.C. </b> <b>Zaily Dorta Guridi, Dr.C. Enrique    Rogelio Ar&#250;s Soler, Dr. Luis Calzadilla Bertot</b> </font></p>     <p><font size="2" face="Verdana">Instituto de Gastroenterolog&#237;a. La Habana,    Cuba. </font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>RESUMEN</b> </font></p>     <p><font size="2" face="Verdana"> Se estima que unos 170 millones de personas    est&#225;n infectadas por el virus de la hepatitis C (VHC) en todo el mundo.    La persistencia del virus en el organismo es consecuencia de su capacidad de    mutar y de las alteraciones en la respuesta inmunol&#243;gica que produce. Existen    teor&#237;as que relacionan este virus con la linfomag&#233;nesis. El riesgo    relativo de que pacientes infectados con el VHC padezcan linfoma no Hodgkin    (LNH) es de 2 a 4 veces mayor que en los sujetos no infectados. Esta asociaci&#243;n    tiene variabilidad geogr&#225;fica: los pa&#237;ses donde esa asociaci&#243;n    es mayor son Italia, Jap&#243;n y Estados Unidos, y donde es menor son Canad&#225;    y los del norte de Europa. El linfoma de la zona marginal de c&#233;lulas B    y el linfoplasmocitico<b> </b>son los m&#225;s reportados en asociaci&#243;n    con el VHC. Los LNH indolentes asociados con el VHC pueden ser tratados con    terapia antiviral, no as&#237; las formas agresivas que necesitan de inmunoquimioterapia    espec&#237;fica. Se ha demostrado que la hepatitis C es un significativo factor    de riesgo para la toxicidad hep&#225;tica en los pacientes que necesitan quimioterapia.    </font></p>     <p> <font size="2" face="Verdana"><b>Palabras clave: </b> hepatitis cr&#243;nica    por virus C, linfoma no Hodgkin. </font></p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>ABSTRACT</b>    <br>       <br>   170 million people are estimated to be infected with hepatitis C virus (HCV)    worldwide. The persistence of the virus in the body is due to its ability to    mutate and alterations in the immune response that occurs. There are theories    linking this virus lymphoma genesis. The relative risk of HCV-infected patients    suffering from non-Hodgkin lymphoma is 2-4 times higher than in uninfected subjects.    This association has geographic variability. Countries where the association    is stronger are Italy, Japan, and the United States, and it is lesser in Canada    and northern Europe. Lymphoma of the marginal zone in B cells and lymphoplasmacytic    are the most well-informed in association with HCV. Indolent non-Hodgkin lymphomas    associated with HCV can be treated with antiviral therapy, but the aggressive    forms require specific immunochemotherapy. Hepatitis C has been shown to be    a significant risk factor for hepatic toxicity in patients needing chemotherapy.    <br>       <br>   <b>Key words:</b> chronic hepatitis C virus, non-Hodgkin lymphoma (NHL).</font></p> <hr size="1" noshade>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana"><b><font size="3">INTRODUCCI&#211;N </font></b>    </font></p>     <p><font size="2" face="Verdana"> El virus de la hepatitis C (VHC) fue identificado    por primera vez en el a&#241;o 1989, mediante el empleo de t&#233;cnicas de    biolog&#237;a molecular, como el principal agente causal de las hepatitis no-A,    no-B postransfusionales.<sup>1</sup> </font></p>     <p><font size="2" face="Verdana"> Se estima que unos 170 millones de personas    est&#225;n infectadas por el virus de la hepatitis C (VHC) en todo el mundo    y su incidencia es de 1-3 casos por 10 000 hab/a&#241;o.<sup>2</sup> Esta infecci&#243;n    es la principal causa de cirrosis en el mundo occidental y, a su vez, constituye    la primera indicaci&#243;n para trasplante hep&#225;tico.<sup>3</sup> </font></p>     <p><font size="2" face="Verdana"> Al VCH se le conocen 6 genotipos, que se dividen    en alrededor de 80 subtipos y se caracterizan por una gran variabilidad geogr&#225;fica.    Los genotipos 1, 2 y 3 est&#225;n distribuidos en todo el mundo, el 4 casi es    propio de &#193;frica, mientras que el 5 se encuentra en Sud&#225;frica y el    6, en Asia. <sup>4,5</sup> En Cuba, el genotipo que predomina es el 1.<sup>6</sup>    </font></p>     <p><font size="2" face="Verdana"> Durante el proceso de replicaci&#243;n viral    se producen variaciones puntuales del genoma que dan lugar a cuasiespecies.    Esta capacidad de mutar es una de las caracter&#237;sticas que le permiten al    virus escapar a los mecanismos de defensa inmunol&#243;gicos y lograr su persistencia,<sup>7</sup>    de ah&#237; que alrededor de 85 % de los pacientes infectados por el VHC no    logra eliminar este virus durante la fase aguda. En estos enfermos ocurre un    progreso lento de la fibrosis y se estima que 20-30 % de ellos desarrollar&#225;n    cirrosis hep&#225;tica tras 20 a&#241;os de infecci&#243;n,<sup>8,9</sup> de    los cuales anualmente 3-5 % desarrollar&#225; un carcinoma hepatocelular.<sup>10</sup>    </font></p>     <p><font size="2" face="Verdana"> Adicionalmente, este virus provoca alteraciones    en la respuesta inmunol&#243;gica, que es otro mecanismo por el que se produce    la persistencia viral. Dentro de las modificaciones en la respuesta celular    se ha observado una disminuci&#243;n en relaci&#243;n con las c&#233;lulas <i>Natural    Killer</i> (NK), con capacidad citol&#237;tica activada, circulantes en sangre    perif&#233;rica.<sup>11</sup> Por otra parte, est&#225; afectada la capacidad    para activar las c&#233;lulas dendr&#237;ticas, por la expresi&#243;n incrementada    del receptor CD94-NK2A y la producci&#243;n de interleuquina 10 (IL-10) y <i>tumor    growth factor beta</i> (TGF-</font><font face="Symbol" size="3">b</font><font size="2" face="Verdana">),    lo cual crea un ambiente de inmunotolerancia.<sup>12</sup> </font></p>     <p><font size="2" face="Verdana"> Se ha detectado que la prote&#237;na E2 del    VHC puede inhibir la capacidad citol&#237;tica y secretora de citoquinas de    las c&#233;lulas NK a trav&#233;s del entrecruzamiento de CD81.<sup>13</sup>    A lo anterior se suma que en la infecci&#243;n por el VHC,<sup>14</sup> est&#225;    afectada la presentaci&#243;n antig&#233;nica por la c&#233;lula dendr&#237;tica    y los macr&#243;fagos, lo cual trae como resultado una inefectiva sensibilizaci&#243;n    de las c&#233;lulas T o el mantenimiento fallido de las c&#233;lulas de memoria,    as&#237; como una limitada y tard&#237;a respuesta humoral.<sup>14,15</sup>    </font></p>     <p><font size="2" face="Verdana"> Desde hace m&#225;s de una d&#233;cada se ha    asociado epidemiol&#243;gicamente la infecci&#243;n cr&#243;nica por VHC con    una variedad de manifestaciones extrahep&#225;ticas (<u><a href="/img/revistas/med/v53n4/t0110414.gif">tabla</a></u>).<sup>16</sup>    </font></p>     <p align="left"><font size="2" face="Verdana"> Las primeras descripciones de asociaci&#243;n    de la infecci&#243;n por el virus de la hepatitis C con el linfoma no Hodgkin    (LNH) corresponden a <i>Ferri</i> y otros, as&#237; como a <i>Pozzato</i> y    otros, en el a&#241;o 1994,<sup>17,18</sup> desde entonces, existen m&#250;ltiples    publicaciones en las que se han expuesto evidencias del aumento del riesgo de    este tipo de linfoma en estos pacientes.<sup>19-21</sup> </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"> La g&#233;nesis de un linfoma es un proceso    multifactorial en el que intervienen factores gen&#233;ticos y ambientales,    as&#237; como ciertos agentes infecciosos.<sup>22</sup> Dentro de los factores    de riesgo se destacan: a) inmunodeficiencias cong&#233;nitas y adquiridas; b)    infecciones: virales (virus de leucemia humana T tipo I, virus de Epstein-Barr    [VEB] y virus de inmunodeficiencia humana [VIH]) y bacterianas (<i>Helicobacter    pylori</i>); c) administraci&#243;n de difenilhidanto&#237;na y quimioterapia    antineopl&#225;sica y d) exposiciones ocupacionales a pesticidas y solventes    org&#225;nicos.<sup>23</sup> </font></p>     <p>&nbsp; </p>     <p><font size="2" face="Verdana"><b><font size="3">HIP&#211;TESIS DE LOS MECANISMOS    MOLECULARES DEL VHC EN LA LINFOMAG&#201;NESIS </font></b> </font></p>     <p><font size="2" face="Verdana"> Los mecanismos moleculares que sustentan la    asociaci&#243;n entre el LNH y el VHC no se encuentran bien aclarados. Sin embargo,    este virus no se limita a las c&#233;lulas hep&#225;ticas, sino que est&#225;    demostrado su notable linfotropismo por las c&#233;lulas B.<sup>22</sup> Hay    evidencias de que los linfocitos reactivos presentes en el tejido hep&#225;tico    de los pacientes con hepatitis cr&#243;nica por el VHC tienen integrado el virus    y expresan ant&#237;genos de este.<sup>24 </sup> Existen varias teor&#237;as    que tratan de explicar la linfomag&#233;nesis en los pacientes con hepatitis    C, dentro de estas se destacan: </font></p>     <p><font size="2" face="Verdana"> a) La interacci&#243;n de la glucoprote&#237;na    E2 del VHC con el receptor CD81 de las c&#233;lulas B, que induce linfoproliferaci&#243;n.<sup>25</sup>    </font></p>     <p><font size="2" face="Verdana"> b) Sobreexpresi&#243;n de la prote&#237;na antiapopt&#243;tica    bcl-2 en linfocitos B que aumentar&#237;a la supervivencia celular y que guarda    relaci&#243;n con la translocaci&#243;n cromos&#243;mica.<sup>26</sup> </font></p>     <p><font size="2" face="Verdana"> c) La existencia de otras mutaciones cromos&#243;micas    y expresi&#243;n de protoncogenes que inhiben la regulaci&#243;n celular normal.<sup>26</sup>    </font></p>     <p><font size="2" face="Verdana"> La asociaci&#243;n m&#225;s importante para    demostrar el poder onc&#243;geno directo del VHC, ha sido la curaci&#243;n de    muchos linfomas de bajo grado de malignidad con el tratamiento antiv&#237;rico    para el VHC.<sup>27,28</sup> </font></p>     <p> <font size="2" face="Verdana"><b>    <br>   Epidemiolog&#237;a</b> </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">- <i>Prevalencia del LNH de c&#233;lulas B en    pacientes con VHC </i> </font></p>     <p><font size="2" face="Verdana"> Se ha observado que la asociaci&#243;n entre    la hepatitis por virus C y el linfoma no-Hodgkin (LNH) de c&#233;lulas B tiene    variabilidad geogr&#225;fica.<sup>29</sup> En Italia, esta asociaci&#243;n se    encuentra con una media de 19,8 % en una cohorte de 2 668 casos procedentes    de 18 estudios. En Jap&#243;n se han reportado valores medios de 14 % y en Estados    Unidos, de 11 %.<sup>30-32</sup> Contrariamente, en m&#225;s de 300 casos de    LNH estudiados en el norte de Europa, no se reportaron pacientes con esta infecci&#243;n    viral. Tampoco se observ&#243; asociaci&#243;n en 2 estudios realizados en Canad&#225;.<sup>31,32</sup></font></p>     <p><font size="2" face="Verdana">     <br>   A pesar de la variabilidad de la prevalencia de hepatitis C, parece que el riesgo    relativo de LNH en pacientes con hepatitis C cr&#243;nica es de 2 a 4 veces    mayor que en los sujetos no infectados.<sup>33</sup></font></p>     <p><font size="2" face="Verdana"> Dentro de los factores que pudieran contribuir    con la variabilidad gen&#233;tica, descritos por algunos autores,<sup>31</sup> se encuentran:    </font></p>     <p><font size="2" face="Verdana"> a) Prevalencia de la infecci&#243;n por VHC    en la poblaci&#243;n general de la regi&#243;n afectada en particular. </font></p>     <p><font size="2" face="Verdana"> b) Genotipo del VHC. </font></p>     <p><font size="2" face="Verdana"> c) Subtipo histol&#243;gico de linfoma. </font></p>     <p> <font size="2" face="Verdana"><i>    <br>   Estudios realizados</i> </font></p> <font size="2" face="Verdana"> Italia es uno de los pa&#237;ses con m&#225;s publicaciones  en este tema.<sup>31,34</sup> Se presentan algunos resultados de un estudio multic&#233;ntrico  de casos y controles donde se estudiaron 400 pacientes con LNH, y 17 % ten&#237;a  asociada una infecci&#243;n por VHC.<sup>35</sup></font>    ]]></body>
<body><![CDATA[<br>     <br> <font size="2" face="Verdana"> Los tipos de LNH que predominaron en estos pacientes  fueron el linfoplasmoc&#237;tico y el de la zona marginal de c&#233;lulas B.<sup>35</sup>  Esto coincide con lo reportado en la literatura por otros autores.<sup>21,31</sup>  En cuanto a la prevalencia, seg&#250;n el grado de severidad de los LNH, en este  estudio predomin&#243; la forma agresiva. Sin embargo, en la literatura se ha  reportado predominio de la asociaci&#243;n del VHC con linfomas indolentes.<sup>30,35-37</sup></font>      <p><font size="2" face="Verdana"> En cuanto a la distribuci&#243;n de los genotipos,    prevalecieron los 1b, 2a y 2b. Son de esperar estos resultados, pues coinciden    con la distribuci&#243;n geogr&#225;fica que caracteriza a Italia.<sup>38-40</sup></font></p>     <p><font size="2" face="Verdana"> En un meta-an&#225;lisis publicado por la Asociaci&#243;n    Europea para el Estudio del H&#237;gado (EASL, seg&#250;n sus siglas en ingl&#233;s),    se aborda el manejo cl&#237;nico de la HVC asociada con el LNH.<sup>41</sup>    Dentro de los principales resultados se encontr&#243; que el 75 % de los pacientes    con LNH que logr&#243; una respuesta, ya fuera completa o parcial, tuvo disminuci&oacute;n    significativa de los niveles de la carga viral por el tratamiento antiviral.<sup>28,41,42</sup>    </font></p>     <p><font size="2" face="Verdana"> La evidencia m&#225;s convincente de relaci&#243;n    causal entre el LNH y el VHC es la regresi&#243;n tumoral, en pacientes tratados    con interfer&#243;n alfa-2b o interfer&#243;n pegilado alfa m&#225;s ribavirina,<sup>41</sup>    lo cual constituye una opci&#243;n terap&#233;utica para los LNH de bajo grado    de malignidad asociados con infecci&#243;n cr&#243;nica por el VHC.<sup>28,43</sup>    </font></p>     <p><font size="2" face="Verdana"> Sin embargo, cuando se trate de LNH con grado    de malignidad intermedio o alto, debe indicarse tratamiento con inmunoquimioterapia    con radioterapia o cirug&#237;a o sin ellas. En estos casos, el tratamiento    antiviral del VHC puede desempe&#241;ar un papel en la consolidaci&#243;n terap&#233;utica    de la regresi&#243;n del linfoma con el fin de evitar recidivas.<sup>44,45</sup>    </font></p>     <p><font size="2" face="Verdana"> En otros trabajos en los que se analiz&#243;    la supervivencia de los pacientes con LNH se demostr&#243; que esta era menor    en los sujetos con hepatitis cr&#243;nica por virus C. Las diferencias en la    supervivencia durante los 2 primeros a&#241;os en pacientes infectados por el    VHC en relaci&#243;n con los no infectados, se deben a la hepatotoxicidad de    los pacientes con virus C. Por otra parte, se observ&#243; que la toxicidad    hep&#225;tica se incrementaba en frecuencia y severidad a medida que avanzaban    los ciclos de quimioterapia.<sup>46,47</sup> </font></p>     <p><font size="2" face="Verdana"> Adem&#225;s, se plantea que en los pacientes    con hepatitis cr&#243;nica por virus C el incremento de la hepatotoxicidad est&#225;    dado por la citotoxicidad directa del virus, y por el aumento de la replicaci&#243;n    viral, por la quimioterapia.<sup>46,48</sup> En estos pacientes, la toxicidad    hep&#225;tica provoc&#243; modificaciones de la dosis, as&#237; como retraso    del ciclo de la quimioterapia e, incluso, muerte por progresi&#243;n del linfoma    y fallo hep&#225;tico.<sup>47-49</sup> </font></p>     <p><font size="2" face="Verdana"> En un estudio multic&#233;ntrico realizado en    Jap&#243;n, se evalu&#243; la supervivencia y la toxicidad hep&#225;tica en    553 pacientes con LNH, de los cuales 131 presentaban hepatitis C asociada. Todos    se encontraban bajo tratamiento con rituximab, ciclofosfamida,<b> </b>doxorubicina,<b>    </b>vincristina y prednisona. No se observ&#243; correlaci&#243;n entre la progresi&#243;n    durante la supervivencia de los pacientes con LNH y la infecci&#243;n por el    VHC.<sup>50 </sup>En el an&#225;lisis multivariado se demostr&#243; que la hepatitis    C es un factor de riesgo significativo para la toxicidad hep&#225;tica severa    con un riesgo relativo [OR]: 14,72 y 95 % de intervalo de confianza.<sup>50</sup>    </font></p>     <p><font size="2" face="Verdana"> En resumen,<b> </b>el riesgo relativo de LNH    en pacientes con hepatitis C cr&#243;nica es de 2 a 4 veces mayor que en los    sujetos no infectados. </font><font size="2" face="Verdana">Los pacientes con    LNH indolente asociado con VHC pueden ser tratados con terapia antiviral, mientras    que los que tienen un LNH agresivo deben ser tratados con la inmunoquimioterapia    establecida. </font><font size="2" face="Verdana">El uso de la quimioterapia    sist&#233;mica debe llevar un monitoreo estrecho de la funci&#243;n hep&#225;tica,    as&#237; como un seguimiento multidisciplinario entre oncolog&#237;a, hematolog&#237;a    y hepatolog&#237;a.<sup>41</sup> </font></p> <font size="2" face="Verdana"><br clear="all"/> </font>      ]]></body>
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<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana"> Recibido: 24 de enero de 2014.    <br>   </font><font size="2" face="Verdana">Aceptado: 16 de julio de 2014. </font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"> Ms.C. <i>Zaily Dorta Guridi. </i>Instituto de    Gastroenterolog&#237;a. 25 No. 503 entre H e I, El Vedado. La Habana, Cuba.</font></p>      ]]></body><back>
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