<?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>0120-8748</journal-id>
<journal-title><![CDATA[Acta Neurológica Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta Neurol Colomb.]]></abbrev-journal-title>
<issn>0120-8748</issn>
<publisher>
<publisher-name><![CDATA[Asociación Colombiana de Neurología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-87482014000300009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Gliomas triple negativo]]></article-title>
<article-title xml:lang="en"><![CDATA[Triple-negative gliomas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trejo Paredes]]></surname>
<given-names><![CDATA[María Camila]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Valencia]]></surname>
<given-names><![CDATA[Jenny]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arango Viana]]></surname>
<given-names><![CDATA[Juan Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina Departamento de Psiquiatría e Instituto de Investigaciones Médicas]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina Departamento de Patología]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2014</year>
</pub-date>
<volume>30</volume>
<numero>3</numero>
<fpage>186</fpage>
<lpage>192</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-87482014000300009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-87482014000300009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-87482014000300009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los gliomas son los tumores más comunes entre las neoplasias primarias del Sistema Nervioso Central. La Organización Mundial de la Salud propone un sistema para su clasificación en cuatro grados crecientes de malignidad, teniendo en cuenta algunos rasgos histológicos. Sin embargo, esta clasificación supone varias limitaciones que afectan la conducta terapéutica y dificultan la predicción pronóstica. Estudios recientes han confirmado el valor pronóstico de alteraciones moleculares específicas, demostrando que la clasificación molecular predice la supervivencia de forma más precisa que el estudio histológico. De estas, las más emblemáticas son la deleción 1p19q y las mutaciones en los genes que codifican para IDH1 y TP53. Las mutaciones en los genes IDH1/2 (80% de los gliomas difusos de grado II), la codeleción 1p19q (70% de los oligodendrogliomas) y las mutaciones en TP53 (60% de astrocitomas difusos) constituyen marcadores de mayor supervivencia, por lo cual deben comprobarse rutinariamente en los pacientes con estos tumores como marcadores de pronóstico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Among the primary neoplasms of the central nervous system, gliomas are the most common. The tumour classification system proposed by the World Health Organization assigned four grades of increasing malignancy to gliomas based on some histological features. However, this classification has several limitations, one of which is the poor prognostic prediction which affects the therapeutic approach. Recent studies have shown the prognostic value of specific molecular alterations. The most representative of these are the 1p19q deletion and mutations of the genes encoding IDH and TP53. Mutations of IDH1/2 (80% of low-grade diffuse gliomas, grade II), the 1p19q deletion (70% of oligodendrogliomas) and mutations of TP53 (60% diffuse astrocytomas) are associated with better survival. These three immunohistochemical markers greatly contribute to the classification of gliomas and must be checked routinely as prognostic markers.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Gliomas]]></kwd>
<kwd lng="es"><![CDATA[pronóstico]]></kwd>
<kwd lng="es"><![CDATA[clasificación molecular]]></kwd>
<kwd lng="es"><![CDATA[isocitrato dehidrogenasa]]></kwd>
<kwd lng="es"><![CDATA[deleción 1p19q]]></kwd>
<kwd lng="es"><![CDATA[TP53]]></kwd>
<kwd lng="en"><![CDATA[Gliomas]]></kwd>
<kwd lng="en"><![CDATA[prognosis]]></kwd>
<kwd lng="en"><![CDATA[molecular classification]]></kwd>
<kwd lng="en"><![CDATA[isocitrate dehydrogenase]]></kwd>
<kwd lng="en"><![CDATA[1p19q deletion]]></kwd>
<kwd lng="en"><![CDATA[TP53]]></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>Gliomas triple negativo</b></font></P>     <p align="center"><font size="3"><b>Triple-negative gliomas</b></font></P>      <p align="center">Mar&iacute;a Camila Trejo Paredes(1), Jenny Garc&iacute;a Valencia(2), Juan Carlos Arango Viana(3)</P>      <p>(1)	Estudiante de Medicina, Facultad de Medicina. Universidad de Antioquia. Medell&iacute;n, Colombia.    <br> (2)	MD MSc PhD. Profesora asociada. Departamento de Psiquiatr&iacute;a e Instituto de Investigaciones M&eacute;dicas, Facultad de Medicina. Universidad de Antioquia. Medell&iacute;n, Colombia.    <br> (3)	MD Neuropat&oacute;logo PhD. Profesor titular. Departamento de Patolog&iacute;a. Facultad de Medicina. Universidad de Antioquia. Medell&iacute;n, Colombia.</P>      <p>Recibido: 30/01/14.  Aceptado: 21/04/14.     <br> Correspondencia: Juan Carlos Arango Viana: <a href="mailto:jucav47@hotmail.com">jucav47@hotmail.com</a></p>  <hr>     ]]></body>
<body><![CDATA[<p><B>RESUMEN</b></P>     <p>Los gliomas son los tumores m&aacute;s comunes entre las neoplasias primarias del Sistema Nervioso Central. La Organizaci&oacute;n Mundial de la Salud propone un sistema para su clasificaci&oacute;n en cuatro grados crecientes de malignidad, teniendo en cuenta algunos rasgos histol&oacute;gicos. Sin embargo, esta clasificaci&oacute;n supone varias limitaciones que afectan la conducta terap&eacute;utica y dificultan la predicci&oacute;n pron&oacute;stica. Estudios recientes han confirmado el valor pron&oacute;stico de alteraciones moleculares espec&iacute;ficas, demostrando que la clasificaci&oacute;n molecular predice la supervivencia de forma m&aacute;s precisa que el estudio histol&oacute;gico. De estas, las m&aacute;s emblem&aacute;ticas son la deleci&oacute;n 1p19q y las mutaciones en los genes que codifican para IDH1 y TP53. Las mutaciones en los genes IDH1/2 (80% de los gliomas difusos de grado II), la codeleci&oacute;n 1p19q (70% de los oligodendrogliomas) y las mutaciones en TP53 (60% de astrocitomas difusos) constituyen marcadores de mayor supervivencia, por lo cual deben comprobarse rutinariamente en los pacientes con estos tumores como marcadores de pron&oacute;stico.</P>      <p><b>PALABRAS CLAVE:</b> Gliomas, pron&oacute;stico, clasificaci&oacute;n molecular, isocitrato dehidrogenasa, deleci&oacute;n 1p19q, TP53 (DECS).</P>  <hr>     <p><B>SUMMARY</b></P>     <p>Among the primary neoplasms of the central nervous system, gliomas are the most common. The tumour classification system proposed by the World Health Organization assigned four grades of increasing malignancy to gliomas based on some histological features. However, this classification has several limitations, one of which is the poor prognostic prediction which affects the therapeutic approach. Recent studies have shown the prognostic value of specific molecular alterations. The most representative of these are the 1p19q deletion and mutations of the genes encoding IDH and TP53. Mutations of IDH1/2 (80% of low-grade diffuse gliomas, grade II), the 1p19q deletion (70% of oligodendrogliomas) and mutations of TP53 (60% diffuse astrocytomas) are associated with better survival. These three immunohistochemical markers greatly contribute to the classification of gliomas and must be checked routinely as prognostic markers.</P>      <p><b>KEY WORDS.</b> Gliomas, prognosis, molecular classification, isocitrate dehydrogenase, 1p19q deletion, TP53 (MeSH).</P>  <hr>     <p><b>INTRODUCCI&Oacute;N</b></p>      <p>Los gliomas son los tumores m&aacute;s comunes entre las neoplasias primarias del Sistema Nervioso Central (SNC). Representan aproximadamente entre el 40 y el 45% de los tumores intracraneales (1) y el 77% de los Tumores Cerebrales Primarios (TCPs) en adultos, seg&uacute;n los informes anuales del Central Brain Tumor Registry de Estados Unidos (2). La tasa de incidencia de tumores malignos del SNC es de 5,8 para hombres y 4,1 para mujeres por 100.000 personas-a&ntilde;o en pa&iacute;ses desarrollados y de 3,0 para hombres y 2,1 para mujeres por 100 000 personas-a&ntilde;o en pa&iacute;ses subdesarrollados (3). Estados Unidos es uno de los pa&iacute;ses que reporta una de las incidencias m&aacute;s altas de TCPs; anualmente se presentan alrededor de 22.000 casos nuevos y 13.000 muertes en ese pa&iacute;s(4).</P>      <p>Los gliomas son un grupo heterog&eacute;neo de neoplasias derivadas de c&eacute;lulas madre neurogliales(5, 6). Dependiendo de su histolog&iacute;a se clasifican en tumores astroc&iacute;ticos, oligodendrogliales, oligoastrociticos y neurogliales (7). El origen celular y las caracter&iacute;sticas histopatol&oacute;gicas de los gliomas probablemente est&aacute;n asociados con v&iacute;as etiopatog&eacute;nicas espec&iacute;ficas, pero  estos mecanismos son poco claros (2).</P>      <p>Los TCPs tienen una etiolog&iacute;a multifactorial; uno de los factores de riesgo bien establecidos es la presencia de s&iacute;ndromes gen&eacute;ticos raros, responsables de menos del 10% de los casos (2). Los genes involucrados en estos s&iacute;ndromes se mencionan en la siguiente lista entre par&eacute;ntesis: s&iacute;ndrome de Li Fraumeni (TP53), neurofibromatosis (NF1 y NF2), s&iacute;ndrome melanoma-astrocitoma (CDKN2A), esclerosis tuberosa (TSC1 y TSC2), s&iacute;ndrome de Cowden (PTEN), s&iacute;ndrome de Turcot (APC) y poliposis familiar (APC/MUTYH) (8-10). Tambi&eacute;n est&aacute; demostrado que la exposici&oacute;n a altas dosis de radiaci&oacute;n ionizante es un factor de riesgo (11-13). Recientemente, se ha concentrado inter&eacute;s en el uso de tel&eacute;fonos m&oacute;viles como otro factor de riesgo para gliomas y otros tumores cerebrales; aunque la energ&iacute;a emitida por los campos de radiofrecuencia no ha demostrado ser suficiente para provocar la transformaci&oacute;n maligna a trav&eacute;s de da&ntilde;o directo al &Aacute;cido Desoxirribonucleico (ADN) (14,15).</P>      ]]></body>
<body><![CDATA[<p>La Organizaci&oacute;n Mundial de la Salud (OMS) propone un sistema para la clasificaci&oacute;n de los gliomas en grados crecientes de malignidad (I-IV). Para los gliomas grado II al IV, la OMS tiene en cuenta algunos rasgos histol&oacute;gicos como: celularidad, atipia citonuclear, actividad mit&oacute;tica, proliferaci&oacute;n del endotelio vascular y necrosis (16). Los gliomas grado I son neoplasias de bajo grado de malignidad que generalmente afectan a la poblaci&oacute;n pedi&aacute;trica, est&aacute;n generalmente circunscritos y tienen una tendencia restringida a la infiltraci&oacute;n del tejido adyacente. El diagn&oacute;stico histol&oacute;gico de los gliomas de grado II en adelante, tiene varias limitaciones como: su fundamentaci&oacute;n en criterios subjetivos, la amplia variaci&oacute;n interevaluador, la falta de precisi&oacute;n para la predicci&oacute;n de desenlaces individuales y el desconocimiento del fenotipo y el microambiente tumoral, lo cual afecta la conducta terap&eacute;utica y el pron&oacute;stico (17). Estas limitaciones motivan la investigaci&oacute;n de pruebas moleculares que contribuyan a una mejor clasificaci&oacute;n de los tumores cerebrales, particularmente de los mixtos, que son dif&iacute;ciles de clasificar basados solamente en criterios morfol&oacute;gicos (18-20).</P>      <p>En efecto, estudios recientes han demostrado que la clasificaci&oacute;n molecular basada en el an&aacute;lisis de expresi&oacute;n g&eacute;nica predice la supervivencia de forma m&aacute;s precisa que el estudio histol&oacute;gico (18-20). As&iacute;, por ejemplo, se han descrito cuatro subgrupos de glioblastomas (Proneural, Neural, Cl&aacute;sico y Mesenquimal) de acuerdo con el patr&oacute;n de expresi&oacute;n gen&eacute;tica, con supervivencias diferentes y respuestas diferenciales a la quimio y radioterapia (21). Estos resultados se han extrapolado a gliomas II y III (22).  M&aacute;s aun, recientemente, se ha mostrado una subclasificaci&oacute;n (en estos mismos grupos) para los gliomas II a IV, usando inmunohistoquimica (23).</P>      <p>Otras t&eacute;cnicas moleculares utilizadas para predecir con mayor precisi&oacute;n la supervivencia de los pacientes con gliomas incluyen estudios gen&eacute;ticos como mutaciones puntuales y p&eacute;rdidas y ganancias cromos&oacute;micas, as&iacute; como alteraciones epigen&eacute;ticas como metilaci&oacute;n de promotores (24). Numerosas investigaciones confirman el valor pron&oacute;stico de alteraciones moleculares espec&iacute;ficas. Las m&aacute;s emblem&aacute;ticas fueron propuestas inicialmente para oligodendrogliomas y luego se generalizaron a los tumores mixtos y astroc&iacute;ticos de grados II a IV de los adultos. Estas son la deleci&oacute;n 1p19q y las mutaciones en los genes IDH y TP53 (2). La ausencia de estas tres mutaciones ha identificado un subtipo de gliomas denominado &ldquo;Triple Negativo&rdquo;, en el que profundizaremos en la presente revisi&oacute;n.</P>      <p><b>GEN IDH</b></P>     <p>Las mutaciones en el gen IDH1 que codifica la enzima Isocitrato Deshidrogenasa dependiente de Nicotinamida Adenina Dinucle&oacute;tido Fosfato (NADP) citos&oacute;lico se identificaron insospechadamente en el an&aacute;lisis de secuencias involucradas en el desarrollo de Glioblastomas (GB). La mutaci&oacute;n m&aacute;s frecuente consiste en la sustituci&oacute;n de arginina por histidina en la posici&oacute;n 132 de la cadena de amino&aacute;cidos y se conoce como R132H (25, 26).</P>      <p>La IDH cataliza la descarboxilaci&oacute;n oxidativa de isocitrato a alfa-cetoglutarato, haciendo que el NADP pase a su forma reducida (NADPH). La IDH1 se localiza en el citoplasma y los peroxisomas, y las IDH2-5 est&aacute;n en la mitocondria. En el citoplasma, la IDH1 proporciona NADPH en condiciones no favorables para su generaci&oacute;n por la derivaci&oacute;n de la v&iacute;a hexosa monofosfato. Es importante en la protecci&oacute;n contra el estr&eacute;s oxidativo, puesto que el NADPH citos&oacute;lico es necesario para la regeneraci&oacute;n del glutati&oacute;n reducido, que funciona como antioxidante (25, 26).</P>      <p>La mutaci&oacute;n R132H ha sido reportada en aproximadamente el 12% de todos los GB y en alrededor del 5% de los Glioblastomas Primarios (GBPs). De los gliomas difusos grado II y III de la OMS y los Glioblastomas Secundarios (GBSs), entre el 60% y el 80% presentan la R132H (24). Por definici&oacute;n, los GBSs surgen del Astrocitoma difuso grado II (A II) o el Astrocitoma anapl&aacute;sico grado III (A III), por lo que se ha propuesto que la R132H sea usada como marcador para distinguir GBPs de GBSs (27-30).</P>      <p>El estado de la mutaci&oacute;n R132H es estable durante la progresi&oacute;n de astrocitomas de bajo grado (ABG) a gliomas de alto grado secundarios; aunque tradicionalmente la extensi&oacute;n de la cirug&iacute;a ha sido considerada como un factor pron&oacute;stico favorable independiente en pacientes con astrocitomas difusos grado II (31-35). Estudios m&aacute;s recientes han demostrado que la R132H en astrocitomas difusos grado II es &uacute;til para identificar a los pacientes que se beneficiar&iacute;an de radioterapia y quimioterapia temprana y aquellos que mostrar&aacute;n una mejor respuesta a las modalidades de tratamiento actual despu&eacute;s de la progresi&oacute;n maligna de los mismos (36).</P>      <p>La Supervivencia Global (SG) y la Supervivencia Libre de Progresi&oacute;n (SLP) son significativamente mayores en pacientes con gliomas grado II, III y GB en quienes se ha detectado la mutaci&oacute;n R132H. As&iacute;, se ha reportado en pacientes con gliomas anapl&aacute;sicos grado III con la mutaci&oacute;n R132H una SG de 81,1 meses y una SLP de 37 meses, a diferencia de quienes no la tienen, cuya SG promedio es de 19,4 meses y su SLP es de 9,2 meses (33). Esta asociaci&oacute;n entre la R132H y la SG se mantiene a&uacute;n en ausencia de la co-deleci&oacute;n 1p19q, anormalidad cromos&oacute;mica con importancia pronostica, frecuentemente asociada con la R132H. En pacientes sin la codeleci&oacute;n 1p19q ni la amplificaci&oacute;n del EGFR, se ha reportado una mediana de supervivencia de 51,1 meses Vs. 17,8 meses para los tumores con y sin la R132H, respectivamente (37).</P>      <p>La R132H se asocia con el perfil hipermetilador y particularmente con la metilaci&oacute;n del promotor del gen de la O6-Metilguanina-ADN - Metiltransferasa (MGMT), que en gliomas se ha reportado hasta en el 40%. Dicha metilaci&oacute;n conduce al silenciamiento del gen y a la ausencia de la enzima necesaria para la reparaci&oacute;n del da&ntilde;o a la doble cadena del ADN y la inhibici&oacute;n de la muerte de c&eacute;lulas tumorales causada por  agentes alquilantes como la temozolamida y carmustina. No sorprende que este hallazgo sea un factor asociado con la regresi&oacute;n del tumor y la prolongaci&oacute;n de la SG y la SLP, que es independiente y m&aacute;s fuerte que la edad, la etapa y el grado del tumor (38-40). La R132H en GB se encuentra en general en los pacientes m&aacute;s j&oacute;venes y se asocia con un mejor pron&oacute;stico que es independiente del tipo y grado histol&oacute;gico (37, 41).</P>      ]]></body>
<body><![CDATA[<p><b>TP53</b></P>     <p>TP53 es un gen supresor tumoral que codifica la prote&iacute;na p53; esta se encuentra en el n&uacute;cleo celular en bajas concentraciones y tiene una vida media de 20 minutos aproximadamente. Su funci&oacute;n es la Regulaci&oacute;n de la Gluc&oacute;lisis y la Apoptosis Inducida por TP53 (TIGAR). Mediante la direcci&oacute;n de la glucosa hacia la ruta de las pentosas fosfato (PPP), la TIGAR conduce a la reducci&oacute;n de las Especies Reactivas de Oxigeno (ROS siglas en ingl&eacute;s) por disminuci&oacute;n de la fructosa-2 ,6-bisfosfato (Fru-2 ,6-P2), lo cual aumenta la producci&oacute;n de NADPH y mejora la capacidad celular de manejar el estr&eacute;s redox para proteger de la apoptosis (42). Para ilustrar la relevancia de TIGAR como regulador del estr&eacute;s oxidativo y modulador de la autofagia, apoptosis y senescencia, cabe resaltar que las ROS en concentraciones altas inducen da&ntilde;o genot&oacute;xico, c&aacute;ncer y muerte celular (6, 43, 44).</P>      <p>La Fru-2,6-P2 es un metabolito que act&uacute;a como regulador clave de la gluc&oacute;lisis, cuya concentraci&oacute;n depende de la actividad de diferentes enzimas bifuncionales codificadas por cuatro genes (PFKFB 1-4) (45). La transcripci&oacute;n de uno de ellos, el PFKFB3 es modulada por el Factor Inducible por Hipoxia-1 (HIF-1), el cual se ha encontrado sobrerregulado en pacientes con c&aacute;ncer. Tanto la s&iacute;ntesis como la eliminaci&oacute;n de Fru-2,6-P2 por PFKFB3 y TIGAR son controladas respectivamente por el HIF-1 y p53. Esto demuestra la importancia de la regulaci&oacute;n metab&oacute;lica para la supresi&oacute;n tumoral (46). El estr&eacute;s oxidativo alrededor de la zona necr&oacute;tica en los GB se asocia con una producci&oacute;n aumentada del HIF-1, que a su vez favorece la neoformaci&oacute;n vascular y la proliferaci&oacute;n endotelial, caracter&iacute;sticas histol&oacute;gicas del GB (47). Se ha propuesto tambi&eacute;n una asociaci&oacute;n con fuerte resistencia a la apoptosis, propensi&oacute;n a necrosis e inestabilidad gen&oacute;mica, as&iacute; como resistencia  a la radioterapia (48, 49).</P>      <p>Numerosos estudios han identificado diferentes mecanismos moleculares de radioresistencia celular en los gliomas (50). Una hip&oacute;tesis se basa en las concentraciones de ROS inducidas por la radiaci&oacute;n, lo cual afecta la reparaci&oacute;n de la ruptura de ADN de doble cadena (51). Las concentraciones de ROS est&aacute;n influenciadas por factores end&oacute;genos que incluyen la actividad antioxidante TIGAR (52-54).</P>      <p>La mutaci&oacute;n de TP53 y su sobreexpresi&oacute;n se asocian t&iacute;picamente a un fenotipo astroc&iacute;tico (55). Recientemente, se han identificado mutaciones TP53 recurrentes en aproximadamente dos tercios de los casos de oligodendrogliomas, asociadas estrechamente con la codeleci&oacute;n 1p/19q (56, 57). En este contexto, el desmonte de TIGAR es una nueva estrategia terap&eacute;utica contra los tumores gliales que permite, mediante el aumento del deterioro celular inducido por radiaci&oacute;n, el uso de dosis m&aacute;s bajas de radioterapia (58).</P>      <p><b>CODELECI&Oacute;N 1P19Q</b></P>     <p>La codeleci&oacute;n 1p/19q surge de una traslocaci&oacute;n balanceada centrom&eacute;rica entre los cromosomas 1p y 19q, que resulta en la p&eacute;rdida completa de estos brazos. La codeleci&oacute;n 1p/19q se considera la caracter&iacute;stica gen&eacute;tica de los oligodendrogliomas, puesto que hasta el 80% de los casos la presentan y se considera un evento temprano en el desarrollo de estos tumores (59).</P>      <p>Se ha demostrado una supervivencia m&aacute;s larga en los pacientes con gliomas que tienen la codeleci&oacute;n 1p/19q, quienes adem&aacute;s presentan respuestas significativamente mejores y m&aacute;s duraderas a la quimioterapia, con o sin radioterapia postoperatoria. En cerca del 70% de los tumores, independientemente del grado, con la codeleci&oacute;n 1p/19q, ya sean primarios o recurrentes, se ha reportado una respuesta favorable a quimioterapia con procarbazina, lomustina y vincristina (PLV) (60). La codeleci&oacute;n 1p/19q es un factor pron&oacute;stico independiente, asociado con mejores SLP y SG. Una mayor SLP se ha observado en tumores primarios con la codeleci&oacute;n 1p/19q, mientras que en los recurrentes, esta codeleci&oacute;n se relaciona con una mayor SG (61-66).</P>      <p>En resumen, la clasificaci&oacute;n molecular basada en la R132H, mutaci&oacute;n en TP53  junto con la codeleci&oacute;n 1p/19q, mostr&oacute; un poder predictivo superior a la clasificaci&oacute;n histol&oacute;gica con respecto al resultado cl&iacute;nico y se asocia con una mayor supervivencia. Las mutaciones en IDH1 se presentan en m&aacute;s del 75% de gliomas difusos grado II y grado III; las mutaciones en TP53 en cerca del 60% de los astrocitomas difusos y la codeleci&oacute;n 1p19q, hasta en el 80% de los oligodendrogliomas (67-69).</P>      <p>La R132H es frecuente en los GBS mientras que en los GBP (de novo) con  R132H son muy raros (&lt;5%). Los &uacute;ltimos muestran distribuci&oacute;n por edades y perfiles gen&eacute;ticos similares a los GBS, y son probablemente resultado de una clasificaci&oacute;n err&oacute;nea. La alta prevalencia de R132H en oligodendrogliomas, astrocitomas y glioblastomas secundarios sugiere que comparten una poblaci&oacute;n de c&eacute;lulas progenitoras com&uacute;n. Ambos subtipos de GB adquieren un fenotipo histol&oacute;gico similar, como resultado de alteraciones gen&eacute;ticas comunes, que incluyen la p&eacute;rdida de genes supresores de tumores en el cromosoma 10q (70).</P>      ]]></body>
<body><![CDATA[<p>Aunque los GBP y GBS tienen aspectos morfol&oacute;gicos id&eacute;nticos y algunas anormalidades moleculares similares, su historia natural es diferente. A excepci&oacute;n de la codeleci&oacute;n completa 1p19q, la mayor&iacute;a de alteraciones se encuentran en v&iacute;as de se&ntilde;alizaci&oacute;n implicadas en invasi&oacute;n, transducci&oacute;n de se&ntilde;ales (V&iacute;as Ras-MAPK y P13K- Akt-mTOR), control de ciclo celular (TP53), angiog&eacute;nesis (v&iacute;a del factor de crecimiento del endotelio vascular) y metabolismo celular (mutaciones en IDH) (71).</P>      <p>La mutaci&oacute;n R132H distingue los astrocitomas grado II de los grado III y los GBS de los GBP (71). Las R132H se asocia significativamente con la deleci&oacute;n 1p19q  y con la mutaci&oacute;n y expresi&oacute;n histol&oacute;gica de p53 (72). Curiosamente, la mutaci&oacute;n TP53 y la codeleci&oacute;n 1p19q involucran c&eacute;lulas precursoras gliales con R132H (72).</P>      <p>De acuerdo con las anormalidades moleculares en R132H, TP53, y 1p19q, se podr&iacute;an registrar cuatro subtipos principales de gliomas de bajo grado: R132H + / p53-/1p19q-, R132H + / p53 + /1p19q-, IDH + /p53 -/1p19q+ y triple negativo, este &uacute;ltimo subgrupo con el peor pron&oacute;stico. Tomados en conjunto, con estos tres marcadores inmunohistoqu&iacute;micos se contribuir&aacute; en gran medida a la clasificaci&oacute;n de los gliomas. Por esto deber&iacute;an involucrarse en el estudio histol&oacute;gico de rutina (73), si bien la identificaci&oacute;n de estas anormalidades moleculares exige laboratorios especializados que limitan su aplicabilidad. Existen marcadores surrogados para su identificaci&oacute;n, uno de ellos es la inmunohistoquimica que se puede usar en tejido de biopsia convencional. Hay anticuerpos disponibles para la detecci&oacute;n de la R132H, P53 y para la codeleci&oacute;n 1p19q, se utiliza la alfa internexina 2, en algunas series positivo hasta en el 96% de los gliomas con la coledeci&oacute;n completa (74-78).</P>      <p><b>CONCLUSI&Oacute;N </b></P>     <p>La disponibilidad de m&eacute;todos de inmunohistoquimica capaces de identificar las alteraciones moleculares descritas pueden ser una herramienta &uacute;til, dado su bajo costo y su aplicabilidad general en los laboratorios de neuropatolog&iacute;a. El uso de estos, sumado al enfoque histol&oacute;gico, resulta en mayor exactitud diagn&oacute;stica y  mejor correlaci&oacute;n con el pron&oacute;stico.</P>      <p><B>Agradecimientos</B></P>     <p>Este art&iacute;culo fue financiado por la Estrategia de Sostenibilidad 2013-2014 de la Universidad de Antioquia dada al Grupo Acad&eacute;mico en Epidemiolog&iacute;a Cl&iacute;nica (GRAEPIC).</P>      <p><B>Conflicto de intereses</B></P>     <p>Los autores declaran no tener conflicto de intereses.</P>  <hr>     <p><B>REFERENCIAS</b></p>     ]]></body>
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