<?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>0036-3634</journal-id>
<journal-title><![CDATA[Salud Pública de México]]></journal-title>
<abbrev-journal-title><![CDATA[Salud pública Méx]]></abbrev-journal-title>
<issn>0036-3634</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud Pública]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0036-36342009000800010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Bases genómicas del cáncer de mama: avances hacia la medicina personalizada]]></article-title>
<article-title xml:lang="en"><![CDATA[Genomic basis for breast cancer: advances in personalized medicine]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hidalgo-Miranda]]></surname>
<given-names><![CDATA[Alfredo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Sánchez]]></surname>
<given-names><![CDATA[Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Medicina Genómica  ]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2009</year>
</pub-date>
<volume>51</volume>
<fpage>s197</fpage>
<lpage>s207</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0036-36342009000800010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0036-36342009000800010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0036-36342009000800010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El análisis genómico del cáncer de mama ha permitido el desarrollo de nuevas herramientas de predicción de riesgo y respuesta al tratamiento en esta enfermedad. Los perfiles de expresión génica han generado una mejor clasificación de los tumores e identificado subgrupos tumorales con características clínicas particulares. También se han reconocido patrones de pérdida y ganancia de DNA y expresión de micro-RNA relacionados con la carcinogénesis mamaria, tras identificar nuevos blancos potenciales. Los estudios de asociación del genoma completo han identificado variantes genéticas vinculadas con un mayor riesgo a presentar esta enfermedad, lo que hará posible tomar decisiones de salud pública mejor fundamentadas. Asimismo, los avances en la tecnología de secuenciación de DNA permitirán obtener información acerca de todas las alteraciones genéticas en los tumores. En esta revisión se describe el estado que guarda la investigación genómica en el cáncer de mama, así como la transición de estos hallazgos a la práctica clínica y la creación de las bases para el desarrollo de la medicina personalizada.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Genomic analysis of breast cancer has allowed the development of new tools for the prediction of recurrence and the response to treatment of this disease. Gene expression profiles allow better tumor classification, identifying tumor subgroups with particular clinical outcomes. New potential molecular targets involved in breast carcinogenesis have also been identified through the analysis of DNA copy number aberrations and microRNA expression patterns. Whole genome association studies have identified genetic variants associated with a higher risk to develop this tumor, providing more information for public health decisions. Progress in DNA sequencing methods will also allow for the analysis of all the genetic alterations present in a tumor. In this review, we describe the current state of genomic research in breast cancer as well as how these findings are being translated into clinical practice, contributing to development of personalized medicine.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cáncer]]></kwd>
<kwd lng="es"><![CDATA[mama]]></kwd>
<kwd lng="es"><![CDATA[medicina genómica]]></kwd>
<kwd lng="es"><![CDATA[expresión]]></kwd>
<kwd lng="es"><![CDATA[microarreglos]]></kwd>
<kwd lng="en"><![CDATA[cancer]]></kwd>
<kwd lng="en"><![CDATA[breast]]></kwd>
<kwd lng="en"><![CDATA[genomic medicine]]></kwd>
<kwd lng="en"><![CDATA[expression]]></kwd>
<kwd lng="en"><![CDATA[microarrays]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p><font size="4" face="Verdana, Arial, Helvetica, sans-serif"><a name="add1"></a><b>Bases gen&oacute;micas del c&aacute;ncer de mama: avances hacia la medicina personalizada</b></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Genomic basis for breast cancer: advances in personalized medicine</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Alfredo Hidalgo-Miranda, PhD; Gerardo Jim&eacute;nez-S&aacute;nchez, MD, PhD</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Instituto Nacional de Medicina Gen&oacute;mica. M&eacute;xico</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a href="#add">Solicitud de sobretiros</a></font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1" noshade>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>RESUMEN</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El an&aacute;lisis gen&oacute;mico del c&aacute;ncer de mama ha permitido el desarrollo de nuevas herramientas de predicci&oacute;n de riesgo y respuesta al tratamiento en esta enfermedad. Los perfiles de expresi&oacute;n g&eacute;nica han generado una mejor clasificaci&oacute;n de los tumores e identificado subgrupos tumorales con caracter&iacute;sticas cl&iacute;nicas particulares. Tambi&eacute;n se han reconocido patrones de p&eacute;rdida y ganancia de DNA y expresi&oacute;n de micro-RNA relacionados con la carcinog&eacute;nesis mamaria, tras identificar nuevos blancos potenciales. Los estudios de asociaci&oacute;n del genoma completo han identificado variantes gen&eacute;ticas vinculadas con un mayor riesgo a presentar esta enfermedad, lo que har&aacute; posible tomar decisiones de salud p&uacute;blica mejor fundamentadas. Asimismo, los avances en la tecnolog&iacute;a de secuenciaci&oacute;n de DNA permitir&aacute;n obtener informaci&oacute;n acerca de todas las alteraciones gen&eacute;ticas en los tumores. En esta revisi&oacute;n se describe el estado que guarda la investigaci&oacute;n gen&oacute;mica en el c&aacute;ncer de mama, as&iacute; como la transici&oacute;n de estos hallazgos a la pr&aacute;ctica cl&iacute;nica y la creaci&oacute;n de las bases para el desarrollo de la medicina personalizada.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Palabras clave:</b> c&aacute;ncer; mama; medicina gen&oacute;mica; expresi&oacute;n; microarreglos</font></p> <hr size="1" noshade>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ABSTRACT</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Genomic analysis of breast cancer has allowed the development of new tools for the prediction of recurrence and the response to treatment of this disease. Gene expression profiles allow better tumor classification, identifying tumor subgroups with particular clinical outcomes. New potential molecular targets involved in breast carcinogenesis have also been identified through the analysis of DNA copy number aberrations and microRNA expression patterns. Whole genome association studies have identified genetic variants associated with a higher risk to develop this tumor, providing more information for public health decisions. Progress in DNA sequencing methods will also allow for the analysis of all the genetic alterations present in a tumor. In this review, we describe the current state of genomic research in breast cancer as well as how these findings are being translated into clinical practice, contributing to development of personalized medicine.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Key words:</b> cancer; breast; genomic medicine; expression; microarrays</font></p> <hr size="1" noshade>     <p>&nbsp;</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En M&eacute;xico, el c&aacute;ncer de mama es a partir del a&ntilde;o 2006 la segunda causa de muerte en mujeres de 30 a 54 a&ntilde;os.<sup>1</sup> S&oacute;lo en este a&ntilde;o 4 451 mujeres murieron por esta neoplasia, se reconocieron casos de c&aacute;ncer de mama desde la segunda d&eacute;cada de vida y se registr&oacute; una incidencia m&aacute;xima entre los 40 y 54 a&ntilde;os. En promedio, las mujeres mexicanas desarrollan c&aacute;ncer de mama una d&eacute;cada antes que las europeas o estadounidenses (51 contra 63 a&ntilde;os), en parte debido a la estructura de la pir&aacute;mide poblacional en la que predomina un mayor porcentaje de poblaci&oacute;n joven.<sup>2</sup> </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Oncogen&oacute;mica</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Una de las &aacute;reas de la biomedicina que m&aacute;s se han beneficiado de la caracterizaci&oacute;n del genoma ha sido la oncolog&iacute;a, tanto para entender los mecanismos b&aacute;sicos de los procesos de transformaci&oacute;n neopl&aacute;sica, como para el desarrollo de nuevos servicios para un mejor pron&oacute;stico y evaluaci&oacute;n del riesgo en pacientes oncol&oacute;gicos. Esto ha abierto una nueva &aacute;rea de investigaci&oacute;n en oncolog&iacute;a basada en la caracterizaci&oacute;n gen&oacute;mica de las neoplasias: la oncogen&oacute;mica.<sup>3-7</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El c&aacute;ncer de mama constituye uno de los primeros ejemplos de la traducci&oacute;n de la investigaci&oacute;n gen&oacute;mica a las aplicaciones cl&iacute;nicas. A partir de perfiles moleculares se ha conseguido una mejor clasificaci&oacute;n de los tumores y el desarrollo de nuevos f&aacute;rmacos, as&iacute; como nuevos productos que tienen ya una aplicaci&oacute;n cl&iacute;nica e instrumentos de evaluaci&oacute;n de riesgo y respuesta terap&eacute;utica. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Clasificaci&oacute;n gen&oacute;mica del c&aacute;ncer de mama</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los primeros trabajos que analizaron los cambios en los patrones de expresi&oacute;n g&eacute;nica en el tejido mamario se llevaron a cabo al comparar la expresi&oacute;n de 8 102 genes en 65 muestras quir&uacute;rgicas de c&aacute;ncer de mama para obtener "firmas" o "fotograf&iacute;as" moleculares de cada tumor. Los resultados de dicho estudio evidenciaron la presencia de diversos fenotipos moleculares y ello sugiri&oacute; la existencia de una gran diversidad biol&oacute;gica en los tumores mamarios: </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1.	El grupo <i>ERBB2</i>, que expresa altos niveles del gen<i>  ERBB2,</i> as&iacute; como de otros genes localizados en el amplic&oacute;n <i>ERBB2</i> (negativos al receptor de estr&oacute;genos). Estos tumores muestran una mejor respuesta a la quimioterapia y cerca de 50% responde al tratamiento con Trastuzumab.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">2.	El grupo "parecido al normal" se caracteriza por expresar un gran n&uacute;mero de genes propios del epitelio mamario normal (negativos al receptor de estr&oacute;genos).</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">3.	El grupo "basal" expresa genes caracter&iacute;sticos de las c&eacute;lulas basales de la mama, en particular queratinas 5 y 17, y son negativos al receptor de estr&oacute;genos y amplificaci&oacute;n de <i>ERBB2</i>, es decir, son negativos triples. Este subtipo tiene el pron&oacute;stico m&aacute;s sombr&iacute;o.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">4.	El grupo "luminar" se distingue por la expresi&oacute;n, relativamente alta, de muchos genes expresados en las c&eacute;lulas epiteliales de la luz de los conductos mamarios, incluido el receptor de estr&oacute;genos. Son tumores negativos a <i>ERBB2 </i>y suelen tener la mejor tasa de sobrevida. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los an&aacute;lisis gen&oacute;micos iniciales han demostrado que dentro de la denominaci&oacute;n "tumores negativos a receptor de estr&oacute;genos" se encuentran al menos tres entidades biol&oacute;gicamente distintas (grupos 1 a 3), las cuales deber&iacute;an tratarse como enfermedades diferentes.<sup>8,9</sup> En un estudio posterior se analizaron 78 carcinomas mediante un microarreglo de 8 102 genes. Este trabajo permiti&oacute; depurar la lista de genes capaces de diferenciar a los cuatro patrones previamente descritos y reducirla a 476 genes, algo que se conoce como perfil intr&iacute;nseco de expresi&oacute;n. De esta forma, se han logrado relacionar perfiles de expresi&oacute;n gen&oacute;mica con la sobrevida general de las pacientes. En consecuencia, los subtipos <i>ERBB2</i> y el basal parecen vincularse con una menor sobrevida. Asimismo, los tumores de los subgrupos luminar B y luminar C se identificaron como entidades cl&iacute;nicas diferentes con un curso m&aacute;s agresivo, en particular en relaci&oacute;n con la reincidencia del tumor.<sup>10</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">De manera paralela, otro grupo de investigaci&oacute;n analiz&oacute; los patrones de expresi&oacute;n de unos 25 000 genes en 117 tumores de mama. Al aplicar una medida de clasificaci&oacute;n supervisada, se identific&oacute; un patr&oacute;n de 70 genes que result&oacute; altamente predictivo para el desarrollo de met&aacute;stasis distantes en un periodo de cinco a&ntilde;os en pacientes sin evidencia de met&aacute;stasis linf&aacute;tica regional. Este hallazgo indica que es posible llevar a cabo evaluaciones pron&oacute;sticas del curso cl&iacute;nico en tumores de mama a partir del an&aacute;lisis de la lesi&oacute;n primaria. Este trabajo demuestra la utilidad de las firmas moleculares para detectar patrones de expresi&oacute;n que tienen un mayor valor predictivo que los par&aacute;metros cl&iacute;nicos tradicionales. Adem&aacute;s, permite reconocer a los pacientes que se beneficiar&aacute;n en mayor proporci&oacute;n del tratamiento adyuvante al analizar tumores primarios de mujeres j&oacute;venes en estadios I y II (menores de 53 a&ntilde;os).<sup>11,12</sup> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Adem&aacute;s de la utilidad predictiva, la estadificaci&oacute;n basada en patrones de expresi&oacute;n se correlaciona con la respuesta a la quimioterapia preoperatoria. En consecuencia, a trav&eacute;s del an&aacute;lisis del tejido obtenido de biopsias por aspirado de aguja fina se determin&oacute; que los subtipos parecido al basal y <i>ERBB2 </i>son m&aacute;s sensibles al tratamiento preoperatorio con paclitaxel y doxorrubicina en comparaci&oacute;n con los patrones parecido a normal y luminar.<sup>13</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La utilidad cl&iacute;nica y la relevancia biol&oacute;gica de estos hallazgos tambi&eacute;n se demostraron al analizar los patrones de expresi&oacute;n de lesiones metast&aacute;sicas, en las cuales se identific&oacute; un patr&oacute;n de expresi&oacute;n muy similar al del tumor primario, aun si la met&aacute;stasis distante se desarrollaba a&ntilde;os despu&eacute;s del diagn&oacute;stico y se encontraba en un microambiente distinto al del tumor primario.<sup>14,15</sup></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Diferentes perfiles de expresi&oacute;n y evaluaci&oacute;n del riesgo </b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Para evaluar la correlaci&oacute;n entre los resultados obtenidos con el perfil de genes intr&iacute;nseco y la predicci&oacute;n del curso cl&iacute;nico con base en el patr&oacute;n de expresi&oacute;n de 70 genes, se analizaron 115 tumores independientes, con agrupamiento jer&aacute;rquico basado en los 534 genes que mejor diferenciaban a los subtipos luminar, basal, <i>ERBB2</i> y parecido a normal. Este mismo an&aacute;lisis se aplic&oacute; a los datos, de los cuales se obtuvo el patr&oacute;n predictivo de los 70 genes. Los resultados indicaron que, cualquiera que fuera la plataforma de microarreglos utilizada, se reproduce de forma consistente la identificaci&oacute;n de los subgrupos de tumores en datos generados de forma independiente.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Adem&aacute;s de corroborar la presencia de los subgrupos, este trabajo permiti&oacute; correlacionar al subtipo de tumores con patrones de expresi&oacute;n basal y <i>ERBB2</i> con el grupo de alto riesgo, definido por el patr&oacute;n de 70 genes, mientras que los subtipos luminar A y luminar B mostraron una correlaci&oacute;n con un buen pron&oacute;stico y un pron&oacute;stico intermedio, respectivamente.<sup>16</sup> </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Dado que se han desarrollado diferentes tipos de patrones de expresi&oacute;n con capacidades predictivas en distintas cohortes de pacientes y cada grupo ha utilizado plataformas tecnol&oacute;gicas diferentes, la lista de genes espec&iacute;ficos muestra poca sobreposici&oacute;n entre los distintos estudios. Esto puede impedir la aplicaci&oacute;n cl&iacute;nica de tales hallazgos. El problema se analiz&oacute; mediante la comparaci&oacute;n de cinco patrones de expresi&oacute;n en una cohorte de 295 pacientes en relaci&oacute;n con su capacidad de evaluar riesgo, al margen de los genes analizados en cada uno de lo perfiles. Se compararon cinco patrones: a) el modelo de progresi&oacute;n basado en 70 genes (MammaPrint<sup>TM</sup>);<sup>11,12</sup> b) modelo de respuesta a heridas;<sup>17,18</sup> c) puntaje de recurrencia (OncotypeDX<sup>TM</sup>);<sup>19,20</sup> d) modelo de subtipos intr&iacute;nsecos (luminar A, luminar B, <i>ERBB</i>, receptor de estr&oacute;genos negativo, basal y parecido a normal);<sup>8,16</sup> y e) modelo de tasa de expresi&oacute;n de dos genes (relaci&oacute;n de tasa de expresi&oacute;n entre <i>HOXB13 </i>e <i>IL17BR</i>).</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los resultados indican que la mayor parte de los modelos presenta niveles altos de concordancia en cuanto a su capacidad de predicci&oacute;n cl&iacute;nica en muestras individuales. Casi todos los tumores que se identificaron como basales, <i>ERBB2</i>-negativos a receptor de estr&oacute;genos o luminares B tambi&eacute;n se clasificaron en el grupo de mal pron&oacute;stico mediante los modelos de 70 genes, activaci&oacute;n de respuesta a heridas y una elevada puntuaci&oacute;n de recurrencia. El patr&oacute;n de 70 genes y el modelo de puntuaci&oacute;n de recurrencia concordaron en la clasificaci&oacute;n de desenlace cl&iacute;nico en 77 a 81% de los casos, lo cual resulta relevante, dado que estas pruebas se aplican ya en el &aacute;mbito cl&iacute;nico. En el <a href="/img/revistas/spm/v51s2/html/a10qua01.html">cuadro I</a> se presentan algunas de las pruebas con base gen&oacute;mica para evaluar el riesgo de c&aacute;ncer de mama.<sup>21</sup> </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Correlaci&oacute;n entre perfiles de expresi&oacute;n, clasificaci&oacute;n molecular y patrones de alteraci&oacute;n en el n&uacute;mero de copias de DNA</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El an&aacute;lisis de aberraciones en el n&uacute;mero de copias de DNA en el c&aacute;ncer de mama ha identificado regiones espec&iacute;ficas de amplificaciones en 8q11, 1q21, 17q11, y 11q13, as&iacute; como deleciones en segmentos que contienen genes supresores de tumor conocidos, como <i>PTEN </i>y <i>CDKN2A. </i>En t&eacute;rminos comparativos, los tumores del subtipo basal presentan m&aacute;s alteraciones en el n&uacute;mero de copias que los otros subtipos, lo que indica un mayor grado de inestabilidad cromos&oacute;mica en este subtipo tumoral. Entre los sitios de inter&eacute;s de amplificaci&oacute;n relacionados con peor pron&oacute;stico cl&iacute;nico se encuentran 8q33.3 (<i>EDD1, WDSOF1</i>), 8q24.11-13 (<i>THRAP6, DCC1,  SQLE, SPG8</i>) y 11q14.1 (<i>NDUFC2, ALG8, USP35</i>). En realidad, la amplificaci&oacute;n de cualquiera de estas regiones permite identificar a pacientes con una  menor sobrevida y presentaci&oacute;n de met&aacute;stasis distantes al margen de otros par&aacute;metros cl&iacute;nicos.<sup>22</sup> La <a href="/img/revistas/spm/v51s2/html/a10fig01.html">figura 1</a> muestra un histograma de frecuencias con las regiones del genoma humano que sufren alteraciones en el n&uacute;mero de copias en un mayor porcentaje de los tumores mamarios.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los tumores "triple negativos"<sup>23</sup> se caracterizan por la ausencia de expresi&oacute;n de receptores hormonales (estr&oacute;genos y progesterona), as&iacute; como de HER2, y constituyen cerca de 15% del total de los tumores de mama. Este subtipo de neoplasias pertenece en su mayor&iacute;a al subgrupo de expresi&oacute;n basal, el cual se distingue por un curso cl&iacute;nico muy agresivo.<sup>24</sup> Se han identificado alteraciones espec&iacute;ficas en el n&uacute;mero de copias relacionadas con este tipo de tumor, como amplificaciones en 9p24-p21, 10p15-p13, 12p13, 13q31-q34, 18q12, 18q21-q23 y 21q22.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El uso de microarreglos de genotipificaci&oacute;n de alta densidad ha identificado que los patrones de p&eacute;rdida y ganancia de material gen&eacute;tico son diferentes en subtipos tumorales clasificados mediante expresi&oacute;n. Estas diferencias incluyen la amplificaci&oacute;n de 12q, para el tipo luminar B (gen <i>RAB1B),</i> la amplificaci&oacute;n de 10p para el subtipo basal (gen <i>KIAA1217</i>) y la deleci&oacute;n recurrente de 16q en el subtipo luminar A. Esta deleci&oacute;n constituye un factor de buen pron&oacute;stico en todos los subgrupos tumorales.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El uso del microarreglo de SNP capaz de identificar 500 000 variaciones gen&oacute;micas, junto con el an&aacute;lisis de datos de expresi&oacute;n g&eacute;nica, permitieron determinar la importancia funcional de las alteraciones del n&uacute;mero de copias de DNA. Estos an&aacute;lisis no s&oacute;lo destacan la importancia de los genes identificados con anterioridad, como <i>ERBB2</i>, sino que adem&aacute;s posibilitan una mejor definici&oacute;n de otras regiones importantes, como las amplificaciones en 8p12 y 11q13.5-q14.2. Esto resulta en una notoria reducci&oacute;n del n&uacute;mero de genes blancos con posible relevancia biol&oacute;gica. Un ejemplo de esta utilidad es la reducci&oacute;n de la amplificaci&oacute;n detectada con regularidad en 17q23.2 a una regi&oacute;n de 249 kb que contiene al gen <i>RPS6KB1</i> y al micro-RNA presumiblemente oncog&eacute;nico mir-21.<sup>25</sup> La <a href="/img/revistas/spm/v51s2/a10fig02.jpg">figura 2</a> muestra la capacidad de detecci&oacute;n de alteraciones en el n&uacute;mero de copias de DNA de diferentes plataformas de microarreglos y ejemplifica la forma en que una mejor resoluci&oacute;n hace posible identificar alteraciones gen&oacute;micas m&aacute;s puntuales en el genoma de la c&eacute;lula neopl&aacute;sica.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Micro-RNA y c&aacute;ncer de mama</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Estudios iniciales en c&aacute;ncer de mama han demostrado que es posible diferenciar tejido normal de tumores mediante patrones de expresi&oacute;n de micro-RNA: los que presentan un mayor cambio son mir-125b, mir-145, mir-21 y mir-155.<sup>26</sup> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Asimismo, se ha demostrado que genes relevantes en la transformaci&oacute;n neopl&aacute;sica de la mama son susceptibles a la regulaci&oacute;n por micro-RNA, como en el caso de <i>ERBB2</i> y <i>ERBB3</i>,<sup><i>27</i></sup> receptor de estr&oacute;genos,<sup>28</sup> tropomiosina 1<sup>29</sup> y caderina E,<sup>30</sup> entre otros. En fecha reciente se describi&oacute; la funci&oacute;n del micro-RNA-10b (miR-10b) en el inicio del proceso de invasi&oacute;n y met&aacute;stasis a trav&eacute;s de la inhibici&oacute;n de <i>HOX-D10</i> y la sobreexpresi&oacute;n de <i>RHOC</i>.<sup>31</sup> Estos datos sugieren que los micro-RNA, dada su capacidad de regular la funci&oacute;n de una gran cantidad de blancos transcripcionales, podr&iacute;an determinar los patrones de expresi&oacute;n a nivel de RNA mensajero en los diferentes subtipos de c&aacute;ncer de mama. Esta hip&oacute;tesis se confirma en trabajos recientes, que demuestran la presencia de micro-RNA espec&iacute;ficos en diferentes subtipos tumorales, como el basal y el luminar.<sup>32</sup> El papel de estas mol&eacute;culas como posibles biomarcadores de riesgo se ha demostrado a trav&eacute;s del an&aacute;lisis de miR-126 y miR-335. La expresi&oacute;n de estos micro-RNA se pierde en la mayor&iacute;a de los tumores primarios de mama, sobre todo en los pacientes que presentan una reca&iacute;da y la p&eacute;rdida de la expresi&oacute;n se vincula con un menor tiempo de desarrollo de met&aacute;stasis.<sup>33</sup> </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>An&aacute;lisis de susceptibilidad gen&eacute;tica y riesgo de c&aacute;ncer de mama</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los tres abordajes m&aacute;s importantes que se han aplicado para el descubrimiento de factores gen&eacute;ticos de predisposici&oacute;n al c&aacute;ncer de mama son los estudios de ligamiento en el genoma completo, la b&uacute;squeda de mutaciones en genes candidato mediante secuenciaci&oacute;n y, en fecha reciente, los estudios de asociaci&oacute;n del genoma completo. Hoy d&iacute;a se conocen tres grupos de factores de predisposici&oacute;n gen&eacute;tica al c&aacute;ncer de mama, basados en el riesgo relacionado con cada grupo (<a href="/img/revistas/spm/v51s2/a10cua02.jpg">cuadro II</a>). </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i><b>Estudios de ligamiento</b></i></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El primer grupo de riesgo lo constituyen los genes de alta penetrancia relacionados con el c&aacute;ncer de mama de tipo familiar; a trav&eacute;s de estudios de ligamiento fue posible mapear los genes <i>BRCA1 </i>y <i>BRCA2</i>.<sup>34-37</sup> Las mutaciones en <i>BRCA1 </i>y <i>BRCA2</i> confieren alrededor de 15 a 20% del riesgo relativo familiar para c&aacute;ncer de mama en la poblaci&oacute;n cauc&aacute;sica.<sup>38</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Las mutaciones en <i>TP53</i>, dentro del marco del s&iacute;ndrome de Li-Fraumeni, tambi&eacute;n se consideran como de alta penetrancia, ya que las pacientes con este s&iacute;ndrome presentan un riesgo significativamente m&aacute;s elevado a padecer c&aacute;ncer de mama.<sup>39</sup> Tambi&eacute;n en los s&iacute;ndromes de Cowden (mutaciones en <i>PTEN</i>) y Peutz-Jeghers (<i>STK11</i>) y el s&iacute;ndrome de c&aacute;ncer g&aacute;strico difuso hereditario (mutaciones en <i>CDH1</i>) se ha identificado una mayor susceptibilidad a desarrollar c&aacute;ncer de mama. Sin embargo, las mutaciones en <i>TP53, PTEN, STK11</i> y <i>CDH1</i> son muy raras en los tumores de mama espor&aacute;dicos, por lo que su contribuci&oacute;n al riesgo relativo fuera del contexto de sus s&iacute;ndromes adjuntos es muy baja.<sup>40-44</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i><b>Estudios de resecuenciaci&oacute;n de genes candidato</b></i></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Esta aproximaci&oacute;n ha identificado mutaciones en genes como <i>CHEK2, ATM, BRIP1</i> y <i>PALB2</i>, los cuales pueden elevar el riesgo relativo de padecer la enfermedad de dos a cuatro veces.<sup>45-48</sup> Por otra parte, existe un polimorfismo codificante en el gen <i>CASP8</i> que se vincula con una reducci&oacute;n moderada del riesgo de padecer c&aacute;ncer de mama.<sup>49</sup> Sin embargo, la frecuencia de estas variaciones en la poblaci&oacute;n general es baja y, aun si se consideran todos los genes de susceptibilidad conocidos hasta la fecha, todav&iacute;a queda una proporci&oacute;n de 70 a 75% de los casos de c&aacute;ncer de mama que no presenta estas variantes gen&eacute;ticas.<sup>50</sup></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i><b> Estudios de asociaci&oacute;n, genes candidato y genoma completo</b></i></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los estudios gen&oacute;micos del c&aacute;ncer de mama se llevaron a cabo de manera inicial a trav&eacute;s de una estrategia de gen candidato.<sup>51 </sup>Desafortunadamente, debido a limitaciones en el n&uacute;mero de muestras analizadas y su dise&ntilde;o, muchos de los resultados de estos estudios no fueron replicables.<sup>52</sup> En fecha reciente ha sido posible el desarrollo de plataformas tecnol&oacute;gicas que permiten evaluar cientos de miles de polimorfismos de un solo nucle&oacute;tido (SNPs) en grandes cantidades de muestras, lo cual abre la posibilidad de llevar a cabo estudios de asociaci&oacute;n en todo el genoma y elimina el sesgo debido a preconcepciones acerca del papel de genes espec&iacute;ficos en las enfermedades.<sup>53,54</sup> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En el caso del c&aacute;ncer de mama se han efectuado cuatro estudios de asociaci&oacute;n del genoma completo, que en conjunto han analizado cerca de 40 000 casos contra 79 000 controles (<a href="/img/revistas/spm/v51s2/a10cua03.jpg">cuadro III</a>).<sup>55-58</sup> El dise&ntilde;o experimental de estos estudios se ha dividido en etapas, lo que hace m&aacute;s eficiente el an&aacute;lisis y reduce sus costos. Por ejemplo, el estudio de Easton analiz&oacute; de manera inicial un grupo de 390 casos, ya sea con un historial de c&aacute;ncer de mama hereditario o bien con tumores bilaterales, contra 364 controles mediante una plataforma de microarreglos de genotipificaci&oacute;n para el an&aacute;lisis de 227 876 SNP. Para la segunda etapa se seleccion&oacute; 5% de los SNP m&aacute;s significativos (12 711), los cuales se genotipificaron en 3 990 casos y 3 916 controles independientes. En la tercera etapa se seleccionaron los 30 marcadores m&aacute;s significativos y se analizaron en 21 860 casos y 22 578 controles provenientes de 22 estudios internacionales.<sup>56</sup> Las variantes gen&eacute;ticas reconocidas en estos estudios elevan el riesgo relativo de c&aacute;ncer de mama en &lt;1.5. Sin embargo, en virtud de los enormes n&uacute;meros de casos y controles analizados, el dise&ntilde;o en etapas que permite la replicaci&oacute;n en poblaciones independientes y la astringencia estad&iacute;stica de los an&aacute;lisis, el poder de estas asociaciones es muy elevado.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La se&ntilde;al de asociaci&oacute;n m&aacute;s s&oacute;lida detectada hasta ahora se localiza en la regi&oacute;n 10q26 (<a href="/img/revistas/spm/v51s2/a10cua03.jpg">cuadro III</a>), en el intr&oacute;n 2 del gen <i>FGFR2.</i> Este gen se ha encontrado mutado en diferentes tumores, si bien las bases moleculares acerca del modo en que esta variante incrementa el riesgo de padecer c&aacute;ncer de mama se desconoce. La siguiente variante m&aacute;s relacionada se halla en la regi&oacute;n 16q12, en un bloque de desequilibrio de ligamiento que contiene al gen <i>TNRC9</i> y cuya expresi&oacute;n puede predecir la capacidad metast&aacute;sica de los tumores primarios a hueso.<sup>59</sup> La se&ntilde;al en 5p12 se encuentra en desequilibrio de ligamiento con el gen <i>MRPS30</i>, que codifica para una prote&iacute;na de ribosomas mitocondriales que interviene en el proceso de apoptosis. Por otro lado, la variante situada en 5q11 se halla en el bloque de desequilibrio de ligamiento donde se localizan tres genes; el <i>MAP3K1</i> es el candidato m&aacute;s interesante, ya que codifica a una cinasa activada por mit&oacute;genos que interviene en el control de se&ntilde;alizaci&oacute;n celular. En cuanto al <i>locus</i> 2q33, la regi&oacute;n incluye el gen <i>CASP8</i>, participante en la apoptosis, aunque el bloque de desequilibrio de ligamiento tambi&eacute;n incluye a otros genes cuya funci&oacute;n no se ha determinado en el c&aacute;ncer.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La asociaci&oacute;n con variantes en 8q24 se localiza en una regi&oacute;n muy interesante, ya que diversos estudios la han encontrado vinculada con el c&aacute;ncer de pr&oacute;stata<sup>60</sup>, colon<sup>61</sup> y vejiga.<sup>62</sup> A pesar de la cercan&iacute;a con el oncog&eacute;n <i>C-MYC</i>, las bases moleculares que explican c&oacute;mo estas variaciones afectan la carcinog&eacute;nesis todav&iacute;a se desconocen. Por &uacute;ltimo, la regi&oacute;n 11p15 situada dentro del intr&oacute;n 10 del gen <i>LSP1</i>, que codifica a una prote&iacute;na espec&iacute;fica de linfocitos, tambi&eacute;n se ha relacionado con c&aacute;ncer de mama.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">An&aacute;lisis recientes indican que algunos de los genes en los que se localizan dichos marcadores (<i>TNRC9,  FGFR2 </i>y <i>MAP3K1</i>) presentan expresi&oacute;n diferencial en los distintos subtipos de tumores, definidos por perfiles de expresi&oacute;n.<sup>63</sup> Asimismo, la presencia de algunas de estas variaciones se ha vinculado con positividad para receptores hormonales, bajo grado histol&oacute;gico, met&aacute;stasis en ganglios y tiempo de sobrevida.<sup>64</sup> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i><b>Estudios de resecuenciaci&oacute;n masiva en el c&aacute;ncer de mama</b></i></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En la actualidad, los m&eacute;todos de secuenciaci&oacute;n automatizada han dado un salto significativo, abatiendo los costos en grado notorio y, sobre todo, aumentado la capacidad de secuenciaci&oacute;n en forma masiva. En el caso del c&aacute;ncer de mama, las t&eacute;cnicas de secuenciaci&oacute;n de nueva generaci&oacute;n se han utilizado para identificar los sitios de uni&oacute;n del receptor de estr&oacute;genos alfa<sup>65</sup> y a&uacute;n no se ha notificado la secuencia completa del genoma de un tumor de mama. Sin embargo, mediante tecnolog&iacute;a de secuenciaci&oacute;n tipo Sanger, se analiz&oacute; la secuencia de 20 857 transcritos provenientes de 18 191 genes en una muestra inicial de 11 tumores y dos tejidos normales del mismo paciente (grupo de descubrimiento).<sup>66</sup> Los genes que se encontraron mutados en el grupo de descubrimiento se analizaron con posterioridad en un grupo independiente de 24 muestras (grupo de validaci&oacute;n). Este an&aacute;lisis identific&oacute; un total de 506 mutaciones som&aacute;ticas, de las cuales 79 se validaron en la muestra independiente y se distribuyeron en 62 genes. Estos genes codifican a prote&iacute;nas que participan en 108 v&iacute;as metab&oacute;licas, muchas de las cuales incluyen las v&iacute;as de se&ntilde;alizaci&oacute;n de 3-cinasa de fosfatidilinositol (PI3K) y NF-</font>&#954;<font size="2" face="Verdana, Arial, Helvetica, sans-serif">B. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Traducci&oacute;n de los hallazgos gen&oacute;micos a la pr&aacute;ctica cl&iacute;nica y salud p&uacute;blica</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La traducci&oacute;n de resultados gen&oacute;micos del c&aacute;ncer de mama en productos cl&iacute;nicos se ha observado sobre todo en el campo de los perfiles de expresi&oacute;n de RNA. Tanto el patr&oacute;n analizado por el modelo de 70 genes (MammaPrint) como la firma molecular de 21 genes (OncotypeDX) se utilizan en ensayos cl&iacute;nicos para determinar su utilidad y desempe&ntilde;o, en comparaci&oacute;n con marcadores pron&oacute;sticos tradicionales para determinar si se asigna quimioterapia adyuvante a pacientes de c&aacute;ncer de mama. En el caso del MammaPrint, se efect&uacute;a el estudio MINDACT (<i>Microarray In Node Negative Disease may  Avoid Chemo Therapy</i>) que compara el m&eacute;todo tradicional para la evaluaci&oacute;n de recurrencia del tumor con la firma molecular de 70 genes. Por otra parte, el ensayo cl&iacute;nico <i>Trial Assigning IndividuaLized Options for Treatment</i> (Rx), o TAILORx, analiza la utilidad de la firma basada en 21 genes. Las pacientes con diagn&oacute;stico reciente de c&aacute;ncer de mama, con receptores de estr&oacute;geno o progesterona positivos y negativos para amplificaci&oacute;n de Her2/neu, y cuyos tumores a&uacute;n no metastatizan a los ganglios linf&aacute;ticos, son elegibles para este estudio.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los alelos de riesgo identificados mediante estudios de asociaci&oacute;n de genoma completo contin&uacute;an bajo evaluaci&oacute;n. En fecha reciente se evalu&oacute; el perfil de riesgo generado con seis de estos alelos en cuanto a su capacidad de determinar los riesgos individual y poblacional en la poblaci&oacute;n del Reino Unido. Los resultados indican que el perfil no es suficientemente poderoso para predecir el riesgo individualizado. Sin embargo, es capaz de estratificar a la poblaci&oacute;n general con base en riesgos relativos de acuerdo con grupos de edad. De esta forma, una mujer con un perfil de riesgo gen&eacute;tico determinado por los seis SNP podr&iacute;a ubicarse en un percentil de riesgo poblacional espec&iacute;fico para calcular el riesgo relativo relacionado con su edad. Las mujeres de 50 a&ntilde;os que estuvieran en el quinto percentil de la distribuci&oacute;n de riesgo tendr&iacute;an un riesgo a 10 a&ntilde;os de 1.5%, mientras que las mujeres de 41 a&ntilde;os, ubicadas en el percentil 95, tendr&iacute;an un riesgo a 10 a&ntilde;os de 2.3%.<sup>67</sup></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Otro aspecto relevante de la investigaci&oacute;n en el c&aacute;ncer de mama es la farmacogen&oacute;mica. Los polimorfismos en genes como <i>CYP2D6, CYP3A4, CYP3A5,  CYP19A1</i> y <i>SULT1A1</i> se han relacionado con la eficiencia cl&iacute;nica del tamoxif&eacute;n y las aromatasas. Asimismo, las variantes de los genes <i>CBR3, ABCB1</i> y genes de estr&eacute;s oxidativo se vinculan con una respuesta a antraciclinas y una respuesta cl&iacute;nica general,<sup>68</sup> lo cual los hace candidatos interesantes para su evaluaci&oacute;n en la poblaci&oacute;n mexicana.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Conclusiones y perspectivas</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El avance de las tecnolog&iacute;as de an&aacute;lisis gen&oacute;mico ha permitido identificar firmas moleculares para una mejor predicci&oacute;n del riesgo y evaluar la respuesta al tratamiento en pacientes afectadas. Las pruebas que eval&uacute;an perfiles de expresi&oacute;n como herramientas de predicci&oacute;n de riesgo se utilizan ya en la pr&aacute;ctica cl&iacute;nica con buenos resultados. Por otro lado, los estudios de asociaci&oacute;n de genoma completo han identificado variantes gen&eacute;ticas comunes vinculadas con un incremento del riesgo relativo de padecer c&aacute;ncer de mama, los cuales podr&iacute;an utilizarse como herramientas de estratificaci&oacute;n del riesgo poblacional en programas de salud p&uacute;blica. Sin embargo, la mayor parte de los factores gen&eacute;ticos que modifican el riesgo y la evoluci&oacute;n del c&aacute;ncer de mama a&uacute;n est&aacute; por descubrirse.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Adem&aacute;s, casi todos los estudios en este campo se han llevado a cabo en poblaciones cauc&aacute;sicas que poseen una estructura poblacional distinta de la poblaci&oacute;n mestiza mexicana y latinoamericana. Datos recientes indican que el grado de componente ancestral europeo en pacientes latinas se relaciona con un riesgo incrementado de c&aacute;ncer de mama,<sup>69</sup> lo que sugiere la presencia de diferencias gen&eacute;ticas posiblemente vinculadas con el desarrollo de esta enfermedad.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Esto hace evidente la necesidad de robustecer los programas de investigaci&oacute;n cient&iacute;fica multidisciplinarios tendientes a identificar la frecuencia de las alteraciones gen&oacute;micas descritas en la poblaci&oacute;n mexicana y latinoamericana, ya que en ellas se desconocen aspectos fundamentales, como la distribuci&oacute;n de frecuencia de alelos de riesgo o la incidencia de los distintos perfiles de expresi&oacute;n g&eacute;nica en tumores de mama. Es necesario el desarrollo de programas de investigaci&oacute;n en medicina gen&oacute;mica para ofrecer mejores oportunidades diagn&oacute;sticas y terap&eacute;uticas, a trav&eacute;s de la correlaci&oacute;n de la informaci&oacute;n cl&iacute;nica y los hallazgos gen&oacute;micos, lo cual conducir&aacute; a una pr&aacute;ctica m&eacute;dica cada vez m&aacute;s personalizada que permita la determinaci&oacute;n del riesgo a esta enfermedad, as&iacute; como la predicci&oacute;n de la respuesta al tratamiento y su pron&oacute;stico. Su aplicaci&oacute;n en los pr&oacute;ximos a&ntilde;os tendr&aacute; importantes repercusiones en la calidad de vida de las mujeres en riesgo y sus familias, al contribuir al desarrollo de programas de prevenci&oacute;n m&aacute;s individualizados y, en su caso, con mayor eficacia terap&eacute;utica.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>Referencias</b></font></p>     ]]></body>
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<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a name="add"></a><a href="#add1"><img src="/img/revistas/spm/v51s2/seta.gif" border="0" ></a><b> Solicitud de sobretiros:</b>     <br>   Dr. Gerardo Jim&eacute;nez-S&aacute;nchez    <br>    Instituto Nacional de Medicina Gen&oacute;mica.    <br>   Perif&eacute;rico Sur 4124,Torre Zafiro II, 6o     <br>   Piso, col. Jardines del Pedregal. 01900 M&eacute;xico DF. M&eacute;xico    <br> Correo electr&oacute;nico: <a href="mailto:gjimenez@inmegen.gob.mx">gjimenez@inmegen.gob.mx</a></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Fecha de recibido:    24 de noviembre de 2008     <br>   Fecha de aprobado: 8 de enero de 2009</font></p>      ]]></body><back>
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