<?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>0123-9015</journal-id>
<journal-title><![CDATA[Revista Colombiana de Cancerología]]></journal-title>
<abbrev-journal-title><![CDATA[rev.colomb.cancerol.]]></abbrev-journal-title>
<issn>0123-9015</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cancerología E.S.E.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0123-90152014000100005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Terapia génica para el tratamiento del cáncer]]></article-title>
<article-title xml:lang="en"><![CDATA[Gene therapy for cancer treatment]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodriguez]]></surname>
<given-names><![CDATA[Josefa A]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martinez]]></surname>
<given-names><![CDATA[Lina M]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz]]></surname>
<given-names><![CDATA[Nataly]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cómbita]]></surname>
<given-names><![CDATA[Alba L]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Cancerología ESE  ]]></institution>
<addr-line><![CDATA[Bogotá, D.C ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2014</year>
</pub-date>
<volume>18</volume>
<numero>1</numero>
<fpage>27</fpage>
<lpage>40</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0123-90152014000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0123-90152014000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0123-90152014000100005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El cáncer es una enfermedad compleja de etiología desconocida. Factores genéticos y epigenéticos se asocian al incremento en el riesgo de desarrollar esta enfermedad. A pesar del avance en los tratamientos tradicionales contra el cáncer, el pronóstico de los pacientes no ha mejorado significativamente. Estudios en la patogénesis molecular del cáncer han evidenciado la existencia de dianas moleculares con potencial terapéutico que permiten trasladar los conocimientos de la investigación básica a la clínica implementando nuevas terapias para el beneficio del paciente. El conocimiento del genoma viral, su función, replicación y los mecanismos de infección a la célula tumoral han permitido el desarrollo de la terapia génica viral que puede ser la herramienta ideal para el tratamiento del cáncer. Este artículo revisa diferentes metodologias desarrolladas para el diseno de una terapia génica contra el cáncer, abordada desde diferentes contextos biológicos, y su aplicación clínica para el tratamiento del cáncer.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Cancer is a complicated disease of unknown etiology. Genetic and epigenetic factors are associated with an increased risk for developing this disease. Despite the progress in the traditional cancer therapies, the prognosis of patients has not improved significantly. Studies on the molecular pathogenesis of cancer have demonstrated the existence of molecular targets with therapeutic potential. Furthermore, knowledge of the viral genome function and replication, as well as of the mechanisms of tumor cell infection, have made it possible to develop an ideal tool for gene therapy against cancer and thus, enable the transfer of knowledge from basic to clinical research for the benefit of patients. This article reviews different methodologies developed to design a cancer gene therapy and its clinical application for treating cancer, addressed from various biological contexts.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Compensación de mutaciones]]></kwd>
<kwd lng="es"><![CDATA[Quimioterapia molecular o terapia génica suicida]]></kwd>
<kwd lng="es"><![CDATA[Terapia antiangiogénesis]]></kwd>
<kwd lng="es"><![CDATA[Oncólisis viral]]></kwd>
<kwd lng="es"><![CDATA[Inmunopotenciación genética]]></kwd>
<kwd lng="en"><![CDATA[Mutation compensation]]></kwd>
<kwd lng="en"><![CDATA[Molecular chemotherapy]]></kwd>
<kwd lng="en"><![CDATA[Antiangiogenic gene therapy]]></kwd>
<kwd lng="en"><![CDATA[Viral oncolysis]]></kwd>
<kwd lng="en"><![CDATA[Genetic immunopotentiation]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">      <p>REVISI&Oacute;N</p>     <p align="center"><font size="4"><b>Terapia g&eacute;nica para el tratamiento del c&aacute;ncer</b></font></p>     <p align="center"><font size="3"><b>Gene therapy for cancer treatment</b></font></p>     <p align="center">Josefa A. Rodriguez<sup>*</sup>, Lina M. Martinez, Nataly Cruz y Alba L. C&oacute;mbita</p>     <p><i>Grupo de Investigation en Biologia del C&aacute;ncer, Instituto Nacional de Cancerolog&iacute;a ESE., Bogot&aacute;, D.C., Colombia</i></p>     <p><sup>*</sup> Autor de correspondencia.    <br> <i>Correo electr&oacute;nico: </i><a href="mailto:jrodriguezg@cancer.gov.co">jrodriguezg@cancer.gov.co</a> (J.A. Rodriguez).</p>     <p>Recibido el 17 de septiembre de 2013; aceptado el 10 de febrero de 2014</p> <hr>      <p><b>Resumen</b></p>     ]]></body>
<body><![CDATA[<p>   El c&aacute;ncer es una enfermedad compleja de etiolog&iacute;a desconocida. Factores gen&eacute;ticos y epigen&eacute;ticos se asocian al incremento en el riesgo de desarrollar esta enfermedad.</p>     <p>A pesar del avance en los tratamientos tradicionales contra el c&aacute;ncer, el pron&oacute;stico de los pacientes no ha mejorado significativamente. Estudios en la patog&eacute;nesis molecular del c&aacute;ncer han evidenciado la existencia de dianas moleculares con potencial terap&eacute;utico que permiten trasladar los conocimientos de la investigaci&oacute;n b&aacute;sica a la cl&iacute;nica implementando nuevas terapias para el beneficio del paciente.</p>     <p>El conocimiento del genoma viral, su funci&oacute;n, replicaci&oacute;n y los mecanismos de infecci&oacute;n a la c&eacute;lula tumoral han permitido el desarrollo de la terapia g&eacute;nica viral que puede ser la herramienta ideal para el tratamiento del c&aacute;ncer.</p>     <p>Este art&iacute;culo revisa diferentes metodologias desarrolladas para el diseno de una terapia g&eacute;nica contra el c&aacute;ncer, abordada desde diferentes contextos biol&oacute;gicos, y su aplicaci&oacute;n cl&iacute;nica para el tratamiento del c&aacute;ncer.</p>     <p><b>Palabras Clave</b>: Compensaci&oacute;n de mutaciones; Quimioterapia molecular o terapia g&eacute;nica suicida; Terapia antiangiog&eacute;nesis; Onc&oacute;lisis viral; Inmunopotenciaci&oacute;n  gen&eacute;tica.</p> <hr>     <p><b>Abstract</b></p>     <p>Cancer is a complicated disease of unknown etiology. Genetic and epigenetic factors are associated with an increased risk for developing this disease.</p>     <p>Despite the progress in the traditional cancer therapies, the prognosis of patients has not improved significantly. Studies on the molecular pathogenesis of cancer have demonstrated the existence of molecular targets with therapeutic potential. Furthermore, knowledge of the viral genome function and replication, as well as of the mechanisms of tumor cell infection, have made it possible to develop an ideal tool for gene therapy against cancer and thus, enable the transfer of knowledge from basic to clinical research for the benefit of patients.</p>     <p>This article reviews different methodologies developed to design a cancer gene therapy and its clinical application for treating cancer, addressed from various biological contexts.</p>     <p><b>Keywords</b>: Mutation compensation; Molecular chemotherapy; Antiangiogenic gene therapy; Viral oncolysis; Genetic immunopotentiation.</p> <hr>     ]]></body>
<body><![CDATA[<p><b><font size="3">Introducci&oacute;n</font></b></p>     <p>El c&aacute;ncer es un problema de salud p&uacute;blica cuya incidencia y mortalidad se han incrementado durante las &uacute;ltimas d&eacute;cadas. Seg&uacute;n estudios realizados por la Agencia Internacional para la Investigaci&oacute;n en C&aacute;ncer, en el a&ntilde;o 2015, aproximadamente 7.564.802 personas morir&aacute;n por esta enfermedad<sup>1</sup>. A pesar de los avances quir&uacute;rgicos y del desarrollo de nuedise&ntilde;arvos f&aacute;rmacos, el pron&oacute;stico de los pacientes con c&aacute;ncer no ha mejorado significativamente, por lo cual se requiere el desarrollo de nuevas intervenciones terap&eacute;uticas como la terapia g&eacute;nica, una aproximaci&oacute;n viable y segura para el tratamiento de pacientes con c&aacute;ncer. Esta terapia se basa en la introducci&oacute;n de genes funcionales en c&eacute;lulas som&aacute;ticas para corregir defectos gen&eacute;ticos o ejercer un efecto terap&eacute;utico<sup>2,3</sup>. Se utiliz&oacute; por primera vez con intenci&oacute;n teradise&ntilde;arp&eacute;utica en 1990 para el tratamiento de la inmunodeficiencia severa combinada ADA-SCID<sup>4,5</sup>, y posteriormente, para la inmunodeficiencia severa combinada SCID-X1<sup>6,7</sup>. Pese a que los resultados no fueron muy alentadores en su momento<sup>8</sup>, se demostr&oacute; que la terapia g&eacute;nica humana es factible y puede ser &uacute;til para el tratamiento de enfermedades gen&eacute;ticas, por lo cual se han desarrollado estrategias para aplicarla en el tratamiento de enfermedades complejas como el c&aacute;ncer<sup>9,10</sup>.</p>     <p>Durante la &uacute;ltima d&eacute;cada, los vectores virales se convirtiedise&ntilde;arron en la herramienta ideal para mejorar el tratamiento del c&aacute;ncer. Dada la complejidad de esta enfermedad, es indispensable conocer la secuencia de eventos gen&eacute;ticos y epigedise&ntilde;arn&eacute;ticos implicados en la transformaci&oacute;n maligna para aplicar este conocimiento al desarrollo racional de vectores que puedan utilizarse para el tratamiento del c&aacute;ncer. El sistema viral m&aacute;s eficiente para la transferencia g&eacute;nica contra el c&aacute;ncer <i>in vivo </i>es el basado en adenovirus. Estos virus poseen caracter&iacute;sticas biol&oacute;gicas deseables en un vector viral: transdise&ntilde;arfieren y expresan el gen terap&eacute;utico en c&eacute;lulas quiescentes o en divisi&oacute;n, son de f&aacute;cil manipulaci&oacute;n y propagaci&oacute;n in vitro, no se integran en el genoma celular y tienen ciclo de vida l&iacute;tico. Adicionalmente, inducen una fuerte respuesta inmune <i>in vivo </i>que potencializa la inmunidad antitumoral y permite la r&aacute;pida eliminaci&oacute;n del vector, lo que garantiza un efecto antitumoral de corta duraci&oacute;n que protege las c&eacute;lulas sanas de la exposici&oacute;n prolongada a productos t&oacute;xicos. Los ensayos cl&iacute;nicos dirigidos contra diferentes dianas moleculares utilizando adenovirus han arrojado resultados alentadores<sup>11</sup>.</p>     <p>El objetivo de este art&iacute;culo es revisar los conceptos b&aacute;sicos en terapia g&eacute;nica y su aplicaci&oacute;n para el tratamiento primario del c&aacute;ncer o como coadyuvante en los tratamientos tradicionadise&ntilde;arles. Adem&aacute;s, se describen diferentes estrategias terap&eacute;uticas que est&aacute;n siendo evaluadas para su uso y aplicaci&oacute;n cl&iacute;nica.</p>     <p>La b&uacute;squeda de bibliograf&iacute;a se realiz&oacute; con las palabras clave: compensaci&oacute;n de mutaciones, quimioterapia molecular o terapia g&eacute;nica suicida, terapia antiangiog&eacute;nesis, onc&oacute;lisis viral, e inmunopotenciaci&oacute;n gen&eacute;tica, en las bases de datos PubMed, MedLine, LILACS, (Literatura Latinoamericana y del Caribe en Ciencias de la Salud), the Cochrane Library y CANCERLIT.</p>     <p><b>Sistemas para la introducci&oacute;n de material gen&eacute;tico en las c&eacute;lulas</b></p>     <p>La transferencia de genes terap&eacute;uticos en c&eacute;lulas eucariotas puede realizarse por m&eacute;todos f&iacute;sicos o qu&iacute;micos (transferencia no viral), y biol&oacute;gicos (transferencia viral)<sup>2</sup>. La transferencia g&eacute;nica no viral se denomina transfecci&oacute;n (infecci&oacute;n de una c&eacute;lula con un &aacute;cido nucleico libre) y depende de los sistemas de transporte celulares para internalizar el &aacute;cido nucleico y expresar el gen terap&eacute;utico. Los m&eacute;todos m&aacute;s empleados para la transfecci&oacute;n son: electroporaci&oacute;n, bomdise&ntilde;arbardeo de part&iacute;culas y liposomas cati&oacute;nicos. En contraste, la transferencia g&eacute;nica viral depende de un virus para transferir el material gen&eacute;tico en el interior celular, se denomina transducci&oacute;n (el virus conduce el gen terap&eacute;utico a trav&eacute;s de la membrana al interior celular) o infecci&oacute;n, y el gen terap&eacute;utico se denomina transg&eacute;n.</p>     <p>Aunque los sistemas no virales para la transferencia de genes al interior celular tienen muchas ventajas<sup>12,13</sup>, en endise&ntilde;arsayos cl&iacute;nicos se emplean m&aacute;s los sistemas virales por su tama&ntilde;o, su c&aacute;pside proteica que protege al gen terap&eacute;utico de la degradaci&oacute;n enzim&aacute;tica, y sus mecanismos de internadise&ntilde;arlizaci&oacute;n eficientes. Adem&aacute;s, el genoma viral se puede manipular para eliminar los genes de patog&eacute;nesis y dise&ntilde;ar virus con alta capacidad de infecci&oacute;n y con espacio suficiente para el transg&eacute;n terap&eacute;utico (<a href="#t1">tabla 1</a>)<sup>14</sup>. Los virus m&aacute;s utilizados en terapia g&eacute;nica incluyen miembros de las familias Retroviridae (gammaretrovirus y lentivirus)<sup>15,16</sup>, Adenoviridise&ntilde;ardae<sup>17,18</sup>, y Herpesviridae (HSV)<sup>19</sup>, y Parvoviridae (virus adedise&ntilde;arnoasociados)<sup>20</sup>.</p>     <p align="center"><a name="t1"></a><img src="img/revistas/rcc/v18n1/v18n1a05t1.jpg"></p>     <p>La transferencia g&eacute;nica viral puede realizarse <i>in vivo </i>o <i>ex vivo. In vivo </i>implica la transferencia g&eacute;nica dentro del organismo. Este m&eacute;todo es de f&aacute;cil aplicaci&oacute;n cl&iacute;nica, pero la diana no es completamente espec&iacute;fica y la eficiencia de transducci&oacute;n es muy baja. <i>Ex vivo </i>implica la remoci&oacute;n de las c&eacute;lulas del hu&eacute;sped, su modificaci&oacute;n gen&eacute;tica <i>in vitro, </i>y su reimplantaci&oacute;n dentro del tejido original. Este es el m&eacute;todo de elecci&oacute;n para los protocolos que utilizan c&eacute;lulas dendr&iacute;dise&ntilde;articas<sup>21</sup>, o c&eacute;lulas CD34+<sup>22,23</sup> porque garantiza la especificidad de la diana y permite cuantificar la eficiencia de la transdise&ntilde;arducci&oacute;n<sup>10,24,25</sup>.</p>     ]]></body>
<body><![CDATA[<p>Los adenovirus son muy eficientes para la transferencia g&eacute;nica <i>in vivo. </i>Se han identificado 51 serotipos que infectan huma&ntilde;os, pero los m&aacute;s utilizados en terapia g&eacute;nica son el Ad5 y el Ad2, cuya internalizaci&oacute;n en la c&eacute;lula diana ocurre por la uni&oacute;n de alta afinidad entre la fibra Knob y el receptor coxsackie/adenovirus, seguida por la interacci&oacute;n entre la base pent&oacute;n y las integrinas (<a href="#f1">fig. 1A</a>).</p>     <p align="center"><a name="f1"></a><img src="img/revistas/rcc/v18n1/v18n1a05f1.jpg"></p>     <p><b>Terapia g&eacute;nica contra el c&aacute;ncer</b></p>     <p>La transformaci&oacute;n maligna es un proceso secuencial mediante el cual una c&eacute;lula adquiere nuevas caracter&iacute;sticas que le permiten proliferar sin control e invadir localmente y a distancia. Estas caracter&iacute;sticas pueden ser dianas para el dise&ntilde;o de terapias que eliminen las c&eacute;lulas tumorales, mejoren la respuesta inmune o bloqueen la proliferaci&oacute;n tumoral. La eliminaci&oacute;n de c&eacute;lulas tumorales puede llevarse a cabo mediante la terapia por compensaci&oacute;n de mutaciones (codise&ntilde;arrrecci&oacute;n de genes supresores de tumor o inhibici&oacute;n de ondise&ntilde;arcogenes activados); la terapia g&eacute;nica suicida (infecci&oacute;n del tumor con un virus de replicaci&oacute;n selectiva que codifique una enzima capaz de activar un prof&aacute;rmaco en el tumor) y la terapia oncol&iacute;tica (infecci&oacute;n de las c&eacute;lulas tumorales con un virus l&iacute;tico). La respuesta inmune del hu&eacute;sped se puedise&ntilde;arde mejorar mediante una terapia inmunopotenciadora (que incremente la inmunogenicidad del tumor o potencie la acdise&ntilde;artividad antitumoral de las c&eacute;lulas del sistema inmune), y la proliferaci&oacute;n de c&eacute;lulas tumorales se puede inhibir mediante una terapia antiangiog&eacute;nesis<sup>26</sup> (<a href="#f2">fig. 2</a>).</p>     <p align="center"><a name="f2"></a><img src="img/revistas/rcc/v18n1/v18n1a05f2.jpg"></p>     <p><b>Terapia g&eacute;nica por compensaci&oacute;n de mutaciones</b></p>     <p>Dado que la mayor&iacute;a de mutaciones que conducen al desadise&ntilde;arrrollo tumoral afectan a protooncogenes, genes supresores de tumor y genes reparadores del ADN<sup>27</sup>, y teniendo en cuenta que estas mutaciones son comunes a muchos tumores, el restablecimiento de su funci&oacute;n normal puede ser diana de una terapia g&eacute;nica contra el c&aacute;ncer<sup>26</sup>. Por ejemplo, el gen p53, se encuentra mutado en m&aacute;s del 50% de tumores, y su expresi&oacute;n normal puede restablecerse mediante un adeno dise&ntilde;ar-virus que codifique la copia silvestre del mismo (Ad-p53)<sup>28-34</sup>. En c&aacute;ncer de pr&oacute;stata y de cuello uterino, Ad-p53 inhibe el crecimiento tumoral in vitro e <i>in vivo<sup>29,30,34</sup>, </i>y en osteosarcodise&ntilde;arma, incrementa la sensibilidad al cisplatino y la doxorrubicina<sup>31</sup>.</p>     <p>Un ensayo precl&iacute;nico en c&aacute;ncer de pulm&oacute;n demuestra que Ad-p53 induce la regresi&oacute;n tumoral con una toxicidad aceptable cuando se usa solo o en combinaci&oacute;n con radioterapia y/o quimioterapia<sup>32,35</sup>, y en carcinoma hep&aacute;tico, Ad-p53 combinado con TRAIL ex&oacute;geno incrementa la muerte celular por apoptosis<sup>33</sup>, lo que demuestra que Ad-p53 ejerce un efecto antitumoral sin&eacute;rgico al administrarse combinado con los tratamientos tradicionales de quimio/radioterapia o con nuevos medicamentos antitumorales, maximizando la eliminaci&oacute;n del tumor, y minimizando los efectos colaterales.</p>     <p>Debido al excelente perfil de seguridad y a los efectos antitumorales significativos obtenidos con estos vectores<sup>36</sup>, se han conducido m&aacute;s de 100 ensayos clinicos (fase/I-III) utilizando Ad-p53. La primera patente de terapia g&eacute;nica utilizando Ad-p53 (Gendicine&reg;), contra el c&aacute;ncer de cabeza y cuello, se aprob&oacute; en octubre de 2003. Posteriormente, se aprob&oacute; Oncorine&reg;, contra el carcinoma nasofar&iacute;ngeo<sup>37,38</sup>. Ambos vectores demostraron un efecto sin&eacute;rgico antitumoral en combinaci&oacute;n con radio/quimioterapia, cirugia o hipertermia<sup>39</sup>. Posteriormente, se patent&oacute; Advexin&reg;, similar a Gendicine<sup>&reg;</sup>, cuya patente abarca cualquier adenovirus que porte p53 bajo el control de cualquier promotor<sup>40</sup>.</p>     <p>Otro gen supresor tumoral frecuentemente mutado en c&aacute;ncer, y por lo tanto candidato para la terapia g&eacute;nica, es el del retinoblastoma (Rb), que desempe&ntilde;a un importante papel en el control de la proliferaci&oacute;n celular. Estudios precl&iacute;nicos en carcinoma escamocelular oral con adenovirus que portan la copia silvestre del gen Rb (Ad-RB110) demostraron la inhibici&oacute;n del crecimiento tumoral in vitro e <i>in </i>vivo<sup>41</sup>. Sin embargo, estudios realizados con un mutante de este gen, truncado en la regi&oacute;n N-terminal (RB94), reportan mayor actividad antitumoral y supresi&oacute;n del crecimiento tumoral en varios tumores, incluido el c&aacute;ncer de vejiga. Esta terapia activ&oacute; mecanismos antitumorales como la erosi&oacute;n de los tel&oacute;meros, la crisis cromos&oacute;mica<sup>42</sup>, y la apoptosis independiente de activaci&oacute;n de caspasas y de fragmentaci&oacute;n del ADN<sup>43</sup>. Dado que esta terapia no afecta a las c&eacute;lulas normales, se han ensayado sistemas virales y no virales para administrar de manera sist&eacute;mica el mutante Rb94. Millikan et al. est&aacute;n evaluando la expresi&oacute;n de un pl&aacute;smido que porta el gen RB94 (SGT-94), encapsulado en liposomas en tumores s&oacute;lidos Rb negativos, para demostrar que transfecta espec&iacute;ficamente c&eacute;lulas tumorales, ocasiona muerte celular e incrementa la respuesta antitumoral de la quimio-radiaci&oacute;n<sup>44</sup>.</p>     ]]></body>
<body><![CDATA[<p>Otros mecanismos indispensables para mantener la homeostasis celular en los tejidos sa&ntilde;os son la apoptosis (muerte celular programada) y la autofagia (muerte celular programada de tipo II). Alteraciones en la expresi&oacute;n de las prote&iacute;nas que controlan estos procesos favorecen el desarrollo tumoral y se asocian con el desarrollo de resistencia a las terapias tradicionales. Se puede inducir la muerte celular por apoptosis y sensibilizar a las c&eacute;lulas tumorales frente a los tratamientos tradicionales utilizando como diana prote&iacute;nas de la familia Bcl-2 (Bcl-x&#91;S&#93;, Bcl-x&#91;AK&#93;, Bik/Nbk y Bax) o ligandos de muerte relacionados con el factor de necrosis tumoral (CD95L/FasL, factor de necrosis tumoral a y TRAIL)<sup>45</sup>; Igualmente, se puede inducir la autofagia mediante el restablecimiento de la expresi&oacute;n de XAF1 <i>(XIAP-associated factor-1) </i>con Adeno-XAF1 en c&eacute;lulas de c&aacute;ncer g&aacute;strico<sup>46</sup>. Cuando se combina esta terapia con TRAIL (Adeno-XIAF1/TRAIL), se observa un efecto sin&eacute;rgico que resulta en la muerte por apoptosis<sup>47</sup>.</p>     <p><b>Terapia g&eacute;nica suicida</b></p>     <p>La terapia g&eacute;nica suicida incrementa la susceptibilidad del tumor a la quimioterapia mediante la expresi&oacute;n de un gen suicida que codifica una enzima capaz de catalizar la conversi&oacute;n de un prof&aacute;rmaco no toxico en un metabolito t&oacute;xico potente y de corta duraci&oacute;n con capacidad para difundir desde la c&eacute;lula tumoral en la que se produce y eliminar las c&eacute;lulas tumorales que la rodean (efecto <i>bystander) </i>tras la administraci&oacute;n del prof&aacute;rmaco, sin entrar en la circulaci&oacute;n sist&eacute;mica ni causar efectos secundarios<sup>48</sup>.</p>     <p>Los sistemas suicidas (enzima/prof&aacute;rmaco) m&aacute;s utilizados son: el gen de la timidinacinasa del virus <i>Herpes simplex </i>(HSV<i>-tk) </i>(gen suicida), y como prof&aacute;rmaco, el ganciclovir (GCV), cuyo producto metab&oacute;lico t&oacute;xico es el deoxitimidina trifosfato, un an&aacute;logo de la purina que inhibe la ADN polimerasa e induce apoptosis como resultado del arresto del ciclo celular<sup>49</sup>, y el gen de la citosina desaminasa (CD) de <i>Escherichia coli </i>(gen suicida), y 5-fluorocitocina (5-FC) (prof&aacute;rmaco), cuyo metabolito t&oacute;xico es el 5-fluorouracilo<sup>48</sup>. Se han desarrollado nuevos sistemas suicidas como el basado en el gen del citocromo P450 (gen suicida) y ciclofosfamida o isofosfamida como prof&aacute;rmacos cuya actividad antitumoral se potencializa con la transferencia del gen del citocromo P450<sup>50</sup>.</p>     <p>Numerosos ensayos precl&iacute;nicos para el tratamiento de glioma<sup>51,52</sup>, c&aacute;ncer de vejiga<sup>53</sup>, colon<sup>46</sup>, g&aacute;strico<sup>54</sup> y pulm&oacute;n<sup>55</sup>, utilizando el sistema HSV-tk-GCV han arrojado resultados prometedores para aplicarlos a la cl&iacute;nica. En glioma de alto grado operable, se increment&oacute; significativamente la supervivencia, y debido a que la citotoxicidad de este tratamiento en c&eacute;lulas normales es muy baja, se ha sugerido su posible utilizaci&oacute;n como tratamiento primario o adyuvante<sup>51,56</sup>.</p>     <p>Puesto que el c&aacute;ncer es el resultado de m&uacute;ltiples alteraciones gen&eacute;ticas, el desarrollo de terapias g&eacute;nicas que puedan utilizarse simult&aacute;neamente con otras es de gran importancia. Estudios con xenoinjertos de glioma huma&ntilde;o en ratas permitieron demostrar que la terapia g&eacute;nica suicida en combinaci&oacute;n con la terapia por compensaci&oacute;n de mutaciones tiene mayor efecto antitumoral. El tratamiento simultaneo de HSV-tk/GCV y AdCMVp53 arroj&oacute; resultados similares a los obtenidos con la terapia suicida sola, utilizando &uacute;nicamente la mitad de la dosis de GCV<sup>52</sup>.</p>     <p><b>Lisis de c&eacute;lulas tumorales usando adenovirus de replicaci&oacute;n selectiva (onc&oacute;lisis viral)</b></p>     <p>Los adenovirus son seguros, f&aacute;ciles de manipular gen&eacute;ticamente y poseen ciclo de vida l&iacute;tico, por lo cual, se han desarrollado variantes virales incapaces de replicarse en c&eacute;lulas normales pero capaces de infectar y lisar efectivamente c&eacute;lulas tumorales<sup>57</sup>. Una vez infectada la c&eacute;lula tumoral, el virus l&iacute;tico se replica en su interior hasta que la lisa para liberar nuevas part&iacute;culas virales que infectan las c&eacute;lulas tumorales vecinas, perpetuando los ciclos de infecci&oacute;n, replicaci&oacute;n y lisis mientras existan c&eacute;lulas tumorales que soporten la infecci&oacute;n. Estos adenovirus act&uacute;an como un agente biol&oacute;gico antitumoral m&aacute;s que como veh&iacute;culo para administrar genes terap&eacute;uticos, sin embargo, su efecto puede mejorarse al insertar genes de citocinas o enzimas<sup>58,59</sup>.</p>     <p>Con el fin de dirigir su actividad oncol&iacute;tica, se desarrollaron los adenovirus de replicaci&oacute;n selectiva, mediante la depleci&oacute;n de funciones virales no necesarias en c&eacute;lulas tumorales y la substituci&oacute;n de promotores virales por promotores selectivos del tumor como la alfa-fetoprote&iacute;na, el ant&iacute;geno prost&aacute;tico espec&iacute;fico, la kallikre&iacute;na, la mucina 1 y la osteocalcina, entre otros<sup>60,61</sup>.</p>     <p>El primer virus de replicaci&oacute;n selectiva utilizado en ensayos cl&iacute;nicos aleatorios fue el ONYX-015, que permite la replicaci&oacute;n y lisis de c&eacute;lulas tumorales deficientes en p53. Este vector demostr&oacute; un nivel de eficacia satisfactorio en modelos precl&iacute;nicos contra xenoinjertos de carcinoma de ovario huma&ntilde;o deficiente de p53. Sin embargo, a pesar de su seguridad, su aplicaci&oacute;n en un estudio cl&iacute;nico en mujeres con c&aacute;ncer de ovario recurrente y refractario al tratamiento no mostr&oacute; evidencia clara de respuesta cl&iacute;nica o radiol&oacute;gica en ning&uacute;n paciente<sup>62</sup>.</p>     ]]></body>
<body><![CDATA[<p>En un estudio en fase II, tras haberse demostrado una modesta actividad antitumoral con el tratamiento oncol&iacute;tico en pacientes con c&aacute;ncer de cabeza y cuello<sup>63</sup>, se observ&oacute; que cuando las pacientes recibieron el tratamiento oncol&iacute;tico combinado con quimioterapia (cisplatino y 5-fluorouracilo), tuvieron una respuesta completa sin progresi&oacute;n a los 6 meses de seguimiento, mientras que todos los tratados &uacute;nicamente con quimioterapia, progresaron<sup>64</sup>. Adicionalmente, un ensayo aleatorio de fase III, en el que se utiliz&oacute; el adenovirus H101 en 160 pacientes con c&aacute;ncer de cabeza y cuello o es&oacute;fago, demostr&oacute; que el tratamiento combinado con quimioterapia (cisplatino o adriamicina combinados con 5-fluorouracilo) duplica la respuesta y es bien tolerado<sup>65,66</sup>.</p>     <p>La onc&oacute;lisis viral puede combinarse con otras terapias g&eacute;nicas. El adenovirus oncol&iacute;tico que porta E1A bajo el control del promotor de hTERT, y el gen suicida CD bajo el control del promotor del CMV (Ad.hTERT-E1A/CMV-CD) se replican selectivamente en c&eacute;lulas tumorales humanas e incrementan el efecto letal sobre c&eacute;lulas tumorales<sup>67</sup>.</p>     <p>Tambi&eacute;n se pueden disehar virus que complementen su actividad oncol&iacute;tica con la enzim&aacute;tica. El virus oncol&iacute;tico (Ad5/3-Delta24-FCU1) es una quimera (Ad5/3) en la cual se reemplaza la fibra Knob del serotipo 5 por la del serotipo 3 para mejorar la eficiencia de transfecci&oacute;n de los virus con c&aacute;pside silvestre<sup>68</sup>. Adicionalmente, tiene una depleci&oacute;n de 24-bp (Ad5/3-D24) en la regi&oacute;n constante del gen E1A que restringe su expresi&oacute;n a las c&eacute;lulas tumorales deficientes en Rb<sup>69,70</sup>, y porta el gen FCU1 (Ad5/3-Delta24-FCU1) que codifica una enzima con doble actividad catal&iacute;tica: metaboliza la 5-Fluorocitosina, en 5-fluorouracilo y monofosfato de 5-fluorouridina. Un estudio precl&iacute;nico en carcinoma escamoso de cabeza y cuello m&uacute;rido demostr&oacute; el efecto antitumoral sin&eacute;rgico cuando se administr&oacute; el Ad5/3-Delta24FCU1 con 5-Fluorocitosina en comparaci&oacute;n con los tratados sin el prof&aacute;rmaco<sup>64</sup>.</p>     <p><b>Terapia g&eacute;nica inmunopotenciadora</b></p>     <p>Dado que las c&eacute;lulas tumorales son poco inmunog&eacute;nicas, y debido a que durante su desarrollo el c&aacute;ncer no causa inflamaci&oacute;n ni da&ntilde;o tisular (se&ntilde;ales de peligro), no se activa una respuesta inmune efectiva que controle su crecimiento. La terapia g&eacute;nica inmunopotenciadora o vacunaci&oacute;n gen&eacute;tica en c&aacute;ncer se ha desarrollado con base en la inducci&oacute;n de una inmunizaci&oacute;n activa que module los componentes celulares del sistema inmune e incremente su capacidad para reconocer y rechazar los ant&iacute;genos tumorales. Esta estrategia solo es posible en tumores que expresen ant&iacute;genos tumorales espec&iacute;ficos<sup>71</sup>.</p>     <p>Numerosos ensayos cl&iacute;nicos se han centrado en la introducci&oacute;n de genes de citocinas estimuladoras como interleucina (IL)-2, IL-12 o interfer&oacute;n (<a href="#f2">fig. 2</a>). Modelos de hepatocarcinoma en ratas tratadas con AdCMV-IL-12 demostraron una inhibici&oacute;n dosis-dependiente del crecimiento tumoral<sup>72</sup>, y en modelos m&uacute;ridos, se demostr&oacute; que la cantidad de citocinas expresadas <i>de novo </i>en el tumor es importante, puesto que la regresi&oacute;n es mayor cuando el tratamiento de realiza con adenovirus que codifican la IL-2 bajo el control de un promotor fuerte (citomegalovirus) que cuando se realiza con adenovirus que la codifican bajo el control de un promotor d&eacute;bil como el del Rous Sarcoma Virus<sup>73</sup>.</p>     <p>Las m&uacute;ltiples alteraciones que pueden estar presentes en un tumor dificultan la escogencia de un blanco molecular &uacute;nico para el tratamiento del c&aacute;ncer. La posibilidad de transferir varios genes para estimular diferentes componentes de la inmunidad y ejercer un efecto aditivo se demostr&oacute; en un modelo de mieloma m&uacute;ltiple in vitro, donde la transferencia de Ad-p53/GM-CSF/B7-1 indujo apoptosis, proliferaci&oacute;n de linfocitos y citotoxicidad espec&iacute;fica contra c&eacute;lulas tumorales<sup>28</sup>. Adicionalmente, c&eacute;lulas del sistema inmune pueden modificarse para optimizar los protocolos de inmunopotenciaci&oacute;n. Las m&aacute;s utilizadas son: presentadoras de ant&iacute;geno y linfocitos infiltrantes de tumor (NK o LT cito-t&oacute;xicos espec&iacute;ficos para ant&iacute;genos tumorales)<sup>74</sup>.</p>     <p><b>Terapia antiangiog&eacute;nesis</b></p>     <p>La angiog&eacute;nesis es la formaci&oacute;n de nuevos vasos sangu&iacute;neos a partir de los preexistentes como consecuencia del desbalance en la concentraci&oacute;n de factores anti y proangiog&eacute;nesis por parte de c&eacute;lulas endoteliales, monocitos, c&eacute;lulas de m&uacute;sculo liso y plaquetas. La angiog&eacute;nesis, com&uacute;n a los tumores s&oacute;lidos, es fundamental para la vascularizaci&oacute;n y el desarrollo del microambiente favorable que garantiza la supervivencia y progresi&oacute;n tumoral, y el desarrollo de met&aacute;stasis<sup>75</sup>. Su inducci&oacute;n requiere factores de crecimiento (factor de crecimiento endotelial vascular, factor de crecimiento de fibroblastos, factor de crecimiento epid&eacute;rmico, factor estimulante de colonias de granulocitos y monocitos, factor de crecimiento derivado de plaquetas), citocinas, (IL-1, IL-6, IL-8, factor de necrosis tumoral a) prote&iacute;nas de la matriz extracelular (col&aacute;geno, endostatina, e integrinas) y enzimas proteol&iacute;ticas (catepsina, activador del plasmin&oacute;geno tipo uroquinasa, y gelatinasas A y B), cuya expresi&oacute;n desequilibrada favorece la formaci&oacute;n de vasos sangu&iacute;neos que irrigan el tumor. Un tumor incapaz de inducir la angiog&eacute;nesis permanece en estado latente<sup>76</sup>, por lo cual, una terapia antian-giog&eacute;nesis conducir&aacute; a la muerte de las c&eacute;lulas tumorales al impedir su irrigaci&oacute;n sangu&iacute;nea<sup>77</sup>.</p>     <p>Numerosos ensayos cl&iacute;nicos han demostrado que la endostatina es el inhibidor end&oacute;geno de la angiog&eacute;nesis con mayor espectro antitumoral y menor toxicidad, por lo cual se aprob&oacute; su uso para el tratamiento del c&aacute;ncer. Sin embargo, no ha tenido mucha aplicaci&oacute;n cl&iacute;nica por la dificultad para producirla a gran escala y por su inestabilidad in vitro. Se han desarrollado metodolog&iacute;as que permiten producir y purificar la endostatina humana recombinante mediante la infecci&oacute;n de c&eacute;lulas Ad293 con el vector adenoviral AdrhEndo. Esta prote&iacute;na es m&aacute;s efectiva y estable que la obtenida a partir de levaduras, y su administraci&oacute;n no genera resistencia en modelos animales ni en huma&ntilde;os<sup>78</sup>. Diferentes vectores que portan el gen de la endostatina han demostrado actividad antitumoral: el vector E10A increment&oacute; significativamente el efecto inhibidor del crecimiento tumoral del cisplatino en xenoinjertos de carcinoma escamocelular de cabeza y cuello<sup>79</sup>, y exhibi&oacute; un excelente perfil de seguridad dado que cuando se evalu&oacute; su toxicidad, producci&oacute;n viral y respuesta antitumoral, se encontr&oacute; que la inyecci&oacute;n intratumoral de 1 x 10<sup>12</sup> part&iacute;culas virales por semana en pacientes con tumores s&oacute;lidos ejerce un efecto antitumoral moderado y es bien tolerado<sup>80</sup>.</p>     ]]></body>
<body><![CDATA[<p>Tambi&eacute;n se han ensayado adenovirus recombinantes deficientes de replicaci&oacute;n, que codifican las formas secretadas de endostatina: el rAd, que codifica la endostatina m&uacute;rida, inhibe la formaci&oacute;n de vasos sangu&iacute;neos, la migraci&oacute;n y proliferaci&oacute;n de c&eacute;lulas endoteliales, e induce apoptosis en c&eacute;lulas del endotelio vascular in vitro e <i>in vivo<sup>81</sup>; </i>y el Ad-rhE que codifica la endostatina humana, genera una alta expresi&oacute;n de endostatina <i>in vivo. </i>Tanto el adenovirus como la prote&iacute;na son metabolizados en el h&iacute;gado<sup>82</sup>, y se est&aacute; llevando a cabo un ensayo cl&iacute;nico de fase 1 para evaluar la seguridad y eficacia del adenovirus (Ad-rhE) en pacientes con tumores s&oacute;lidos avanzados<sup>83</sup>.</p>     <p>La inducci&oacute;n de un microambiente antioncog&eacute;nico que anule el prooncog&eacute;nico se puede lograr mediante la terapia g&eacute;nica. El vector Ad-HBx-mIL-12 combina la actividad antiangiog&eacute;nesis e inhibidora de apoptosis de la prote&iacute;na X del virus de la hepatitis B con la actividad de la IL-12, y en carcinoma hepatocelular, conduce a la acumulaci&oacute;n masiva de c&eacute;lulas inmunes, la apoptosis de c&eacute;lulas tumorales y la reducci&oacute;n de los vasos sangu&iacute;neos angiog&eacute;nicos<sup>84</sup>.</p>     <p><b>Terapia g&eacute;nica neoadyuvante para el tratamiento tradicional del c&aacute;ncer</b></p>     <p>La terapia g&eacute;nica en combinaci&oacute;n con los tratamientos tradicionales (neoadyuvancia) mejora la respuesta cl&iacute;nica de los pacientes. Nokisalmi et al. analizaron la dosis de radiaci&oacute;n, la modificaci&oacute;n de la c&aacute;pside viral y 5 diferentes promotores para el transg&eacute;n con el fin de evaluar los mecanismos que median la sobrerregulaci&oacute;n del transg&eacute;n inducida por la radioterapia, y la respuesta al tratamiento combinado con adenovirus deficientes de replicaci&oacute;n y radioterapia, en l&iacute;neas celulares de c&aacute;ncer de mama, pr&oacute;stata y pulm&oacute;n. Un amplio rango de dosis de radiaci&oacute;n incrementa la expresi&oacute;n del transg&eacute;n independientemente de la l&iacute;nea celular, el transg&eacute;n, el promotor o la modificaci&oacute;n de la c&aacute;pside viral. La radiaci&oacute;n induce una respuesta celular global y mayor producci&oacute;n de ARN y prote&iacute;nas, incluidos los productos transg&eacute;nicos del adenovirus<sup>85</sup>.</p>     <p>La terapia g&eacute;nica suicida es un claro ejemplo de tratamiento neoadyuvante para mejorar la eficacia del tratamiento quimioterap&eacute;utico. Predina et al. reportaron una terapia g&eacute;nica con el sistema AdV-tk/GCV para el tratamiento neoadyuvante en carcinoma de es&oacute;fago. La combinaci&oacute;n entre cirug&iacute;a, quimioterapia y AdV-tk/GCV mejora la super-vivencia y disminuye la recurrencia de la enfermedad por el efecto citot&oacute;xico y el incremento del tr&aacute;fico de c&eacute;lulas T-CD8 intratumorales<sup>86</sup>. En la <a href="#t2">tabla 2</a> se muestran algunos ejemplos de ensayos cl&iacute;nicos que han sido desarrollados mediante las diferentes modalidades de terapia g&eacute;nica exclusiva o en combinaci&oacute;n con las terapias convencionales.</p>     <p align="center"><a name="t2"></a><a href="img/revistas/rcc/v18n1/v18n1a05t2.jpg" target="_blank">Tabla 2</a></p>     <p><b>Avances de los ensayos cl&iacute;nicos en terapia g&eacute;nica</b></p>     <p>Actualmente, se est&aacute;n llevando a cabo m&uacute;ltiples ensayos cl&iacute;nicos utilizando una gran variedad de enfoques terap&eacute;uticos para el tratamiento del c&aacute;ncer. Unicamente en los institutos nacionales de salud en Estados Unidos, se encuentran reportes de 1.886 ensayos cl&iacute;nicos con terapias g&eacute;nicas para el tratamiento del c&aacute;ncer, de los cuales 81 est&aacute;n utilizando adenovirus.</p>     <p>Se han desarrollado m&uacute;ltiples agentes virales y no virales para la terapia g&eacute;nica del c&aacute;ncer con resultados prometedores. En la actualidad, los adenovirus son los m&aacute;s populares y estudiados ya que, adem&aacute;s de sus caracter&iacute;sticas deseables, han demostrado poseer un excelente r&eacute;cord de seguridad en pacientes con c&aacute;ncer. Los adenovirus seguir&aacute;n desarroll&aacute;ndose, y se descubrir&aacute; la manera de hacerlos m&aacute;s competitivos al minimizar el efecto de los factores limitantes para su desarrollo y utilizaci&oacute;n en el tratamiento del c&aacute;ncer.</p>     <p>Factores como la imposibilidad para identificar un &uacute;nico gen que funcione en una terapia antitumoral, la falta de selectividad hacia el tumor, la corta duraci&oacute;n de la expresi&oacute;n del gen terap&eacute;utico<sup>87</sup>, la dificultad para transfectar toda la masa tumoral y la fuerte respuesta inmune antiviral generada en el hospedero son las principales limitaciones para la aplicaci&oacute;n de la terapia g&eacute;nica<sup>88,89</sup>.</p>     ]]></body>
<body><![CDATA[<p>Dado que inicialmente se determin&oacute; que la respuesta inmune antiviral y la falta de selectividad hacia el tumor eran las principales limitaciones para la administraci&oacute;n del vector terap&eacute;utico<sup>90</sup>, se diseharon vectores capaces de garantizar la llegada del virus al tumor, la activaci&oacute;n de la respuesta inmune antitumoral y la infecci&oacute;n selectiva de las c&eacute;lulas tumorales. Los adenovirus dependientes de virus auxiliar <i>(gutless) </i>poseen amplias depleciones del genoma, por lo que expresan pocas prote&iacute;nas virales y no inducen una respuesta inmune vigorosa <i>in vivo. </i>Adicionalmente, mantienen su tropismo y la eficiencia para la transducci&oacute;n y expresi&oacute;n del gen terap&eacute;utico<sup>91</sup>.</p>     <p>La v&iacute;a de administraci&oacute;n juega un papel importante en la respuesta al tratamiento con adenovirus recombinantes. La inyecci&oacute;n intratumoral del interferon -mediante un adenovirus- induce mayor inmunidad antitumoral y genera menor toxicidad que la inyecci&oacute;n intravenosa del mismo vector<sup>92</sup>. Un ensayo cl&iacute;nico de fase 1 evalu&oacute; la eficacia terap&eacute;utica, biodistribuci&oacute;n y neurotoxicidad de los adenovirus de gran capacidad (HC-Ad) en ratas con glioblastoma y demostr&oacute; que su administraci&oacute;n intratumoral induce inmunidad sist&eacute;mica antiadenovirus sin afectar a su eficacia terap&eacute;utica<sup>93</sup>. Para salvar la dificultad de la selectividad hacia el tumor, se dise&ntilde;aron vectores con los genes terap&eacute;uticos bajo el control de promotores espec&iacute;ficos de c&eacute;lulas tumorales como hTERT<sup>67</sup>, PMSA<sup>94</sup> o survivina<sup>54</sup>, o con motivos que permiten visualizar el virus (mRFP1) y que lo dirigen a la c&eacute;lula diana (polilisina), donde ejerce el efecto terap&eacute;utico (HSV-1/TK)<sup>87</sup>.</p>     <p>Avances como el desarrollo de sistemas celulares monocito-macr&oacute;fagos para administrar adenovirus oncol&iacute;ticos en zonas de hipoxia en tumores de pr&oacute;stata permitieron utilizar 3 niveles de especificidad: el <i>homming </i>de los macr&oacute;fagos en zonas de hipoxia, la inducci&oacute;n de proliferaci&oacute;n viral en el macr&oacute;fago por hipoxia y la replicaci&oacute;n selectiva del virus en c&eacute;lulas tumorales de pr&oacute;stata. Este sistema permiti&oacute; la transducci&oacute;n de c&eacute;lulas tumorales en zonas de hipoxia y en las met&aacute;stasis, que son dif&iacute;ciles de transfectar<sup>95</sup>.</p>     <p>Muchos factores resultan en una baja eficiencia de transfecci&oacute;n: el tropismo viral hacia el h&iacute;gado, los anticuerpos preexistentes, la gran variedad de c&eacute;lulas que expresan el receptor coxsackie/adenovirus y la no expresi&oacute;n del receptor coxsackie/adenovirus en algunas c&eacute;lulas. Estas dificultades pueden salvarse mediante diversas estrategias de terapia g&eacute;nica (<a href="#f1">figs. 1B</a> y <a href="#f3">3</a>)<sup>94</sup>.</p>     <p align="center"><a name="f3"></a><img src="img/revistas/rcc/v18n1/v18n1a05f3.jpg"></p>     <p>Por &uacute;ltimo, si se considera que tumores como el c&aacute;ncer colorrectal hereditario no poliposo, normalmente posee mutaciones en los genes de la maquinaria de reparaci&oacute;n de apareamientos err&oacute;neos, y que este &quot;fenotipo mutador&quot; puede anular el efecto de la transferencia g&eacute;nica, se podr&iacute;a pensar en una terapia g&eacute;nica que adem&aacute;s del gen terap&eacute;utico incluya la copia silvestre del gen de la reparaci&oacute;n de apareamientos err&oacute;neos que est&eacute; alterado (MLH1, MSH2, MSH6 y PMS2) para revertir el fenotipo mutador.</p>     <p><b><font size="3">Conclusiones</font></b></p>     <p>La terapia g&eacute;nica es un grupo de modalidades terap&eacute;uticas &uacute;nicas proyectadas para introducir &aacute;cidos nucleicos en las c&eacute;lulas y reemplazar material gen&eacute;tico defectuoso o perdido para tratar o curar una enfermedad. Estas terapias, que inicialmente arrojaron resultados inesperados que justificaron su fuerte regulaci&oacute;n para garantizar su seguridad, han demostrado una clara evidencia de su eficacia terap&eacute;utica con una toxicidad extraordinariamente menor que la generada por los tratamientos tradicionales.</p>     <p>Se espera que durante la pr&oacute;xima d&eacute;cada se aprueben y regulen diferentes terapias g&eacute;nicas para el tratamiento del c&aacute;ncer, aunque los resultados precl&iacute;nicos en modelos animales no son muy alentadores. La mayor&iacute;a del trabajo precl&iacute;nico se realiza por xenoinjerto en animales inmunosuprimidos cuyos resultados no se pueden extrapolar a los que se obtendr&iacute;an en un animal inmunocompetente. Incluso si se contara con modelos inmunocompetentes, los datos obtenidos pueden no ser extrapolables a los seres huma&ntilde;os.</p>     <p>Queda mucho por aprender sobre la biolog&iacute;a de la terapia g&eacute;nica viral en pacientes con c&aacute;ncer. Aunque existe evidencia del potencial terap&eacute;utico y de la seguridad en el uso de estos agentes terap&eacute;uticos, la mayor conclusi&oacute;n de los ensayos cl&iacute;nicos que se han llevado a cabo es que la penetraci&oacute;n del tumor y la eficiencia de transducci&oacute;n son muy bajas para permitir un efecto antitumoral significativo. Actualmente, se est&aacute;n llevando a cabo numerosos estudios que permitir&aacute;n desarrollar vectores m&aacute;s eficientes que generen una inmunidad antitumoral sist&eacute;mica reforzada por la respuesta antiviral que genere el vector terap&eacute;utico.</p>     ]]></body>
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