<?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>0121-5256</journal-id>
<journal-title><![CDATA[Revista Med]]></journal-title>
<abbrev-journal-title><![CDATA[rev.fac.med]]></abbrev-journal-title>
<issn>0121-5256</issn>
<publisher>
<publisher-name><![CDATA[Universidad Militar Nueva Granada. Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-52562008000200007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[CÁNCER DE MAMA TRIPLE RECEPTOR NEGATIVO]]></article-title>
<article-title xml:lang="en"><![CDATA[TRIPLE NEGATIVE BREAST CANCER]]></article-title>
<article-title xml:lang="pt"><![CDATA[CÂNCER DE MAMA TRÍPLO RECEPTOR NEGATIVO]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[PEGUERO SÁNCHEZ-NAVARRO]]></surname>
<given-names><![CDATA[JULIO]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GONZÁLEZ-ANGULO]]></surname>
<given-names><![CDATA[ANA MARÍA]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,The University of Texas Medical Branch Brackenridge Hospital Department of Internal Medicine]]></institution>
<addr-line><![CDATA[Austin TX]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Anderson Cancer Center The University of Texas Departments of Breast Medical Oncology and Systems Biology]]></institution>
<addr-line><![CDATA[Houston TX]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2008</year>
</pub-date>
<volume>16</volume>
<numero>2</numero>
<fpage>192</fpage>
<lpage>199</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-52562008000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-52562008000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-52562008000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El cáncer de mama triple receptor negativo es un subtipo de malignidad que no expresa los receptores de estrógeno y progesterona, ni tampoco la proteína HER2. La mayoría de estos tumores hacen parte del espectro denominado perfil genético "basal", sin que los términos sean sinónimos ni intercambiables. La agresiva biología que presenta este tumor requiere de un abordaje multidisciplinario. Todavía esta por definirse la relación entre el gen BRCA y el cáncer de mama triple receptor negativo siendo esta un área creciente de investigación. En Norteamérica se ha identificado a la población premenopáusica afro-americana como una de las etnias a riesgo para padecer este subtipo de neoplasia. La enfermedad es susceptible a quimioterapia convencional sin embargo el riesgo de recurrencia permanece bastante alto. Algunos de los blancos moleculares susceptibles incluyen el receptor del crecimiento del epitelio (EGFR), factor de crecimiento del endotelio vascular (VEGF) y la poli-adenosin difosfato-polimerasa (PARP).]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Triple negative breast cancer is a subtype of malignancy that does not express receptors for estrogen, progesterone or HER2NEU. The majority of these tumors form part of the "basal" genetic profile, but the terms are not synonymous or interchangeable. Because of their aggressive biology, they require a multidisciplinary approach. The relation between the BRCA gene and these tumors is still undefined and the subject of growing research. Premenopausal african americans have been identified in the United States as one of the ethnic groups at risk for this type of tumor. This neoplasm is sensitive to conventional chemotherapy but it remains at a high risk of recurrence. Some of the molecular targets include the epithelial growth factor receptors (EGFR), vascular endothelial growth factor (VGEF) and the poliadenosin-diphosphate-polimerase (PARP).]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[O câncer de mama triplo receptor negativo é um subtipo de malignidade que não expressa os receptores de estrógeno e progesterona, como também não a proteína HER2. A maioria destes tumores faz parte do espectro denominado perfil genética "basal", sem que os termos sejam sinônimos nem intercambiáveis. A agressiva biologia que apresenta este tumor requer de uma abordagem multidisciplinar. Ainda esta por definir-se a relação entre o gene BRCA e o câncer de mama triplo receptor negativo sendo esta um área crescente de investigação. Em Norte América identificou-se à população pré menopáusica afro-americana como uma das etnias com risco para padecer este subtipo de neoplasia. A doença é suscetível à quimioterapia convencional porem o risco de recorrência permanece bastante alto. Alguns dos alvos moleculares susceptíveis incluem; o receptor do crescimento do epitelio (EGFR), fator de crescimento do endotelio vascular (VEGF) e a poli-adenosin difosfato-polimerasa (PARP).]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cáncer de mama]]></kwd>
<kwd lng="es"><![CDATA[receptores estrogénicos]]></kwd>
<kwd lng="es"><![CDATA[receptores de progesterona]]></kwd>
<kwd lng="en"><![CDATA[breast neoplasm]]></kwd>
<kwd lng="en"><![CDATA[receptors]]></kwd>
<kwd lng="en"><![CDATA[estrogen]]></kwd>
<kwd lng="en"><![CDATA[receptors]]></kwd>
<kwd lng="en"><![CDATA[progesterone]]></kwd>
<kwd lng="pt"><![CDATA[neoplasia da mama]]></kwd>
<kwd lng="pt"><![CDATA[receptores estrogênicos]]></kwd>
<kwd lng="pt"><![CDATA[receptores de progesterona]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p align="right"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></p>      <center><font face="verdana" size="4"><b>C&Aacute;NCER DE MAMA TRIPLE RECEPTOR NEGATIVO</b></font></p></center>      <p align="center"><font face="verdana" size="3"><b>TRIPLE NEGATIVE BREAST CANCER</b></font></p>      <p align="center"><font face="verdana" size="3"><b>C&Acirc;NCER DE MAMA TR&Iacute;PLO RECEPTOR NEGATIVO</b></font></p>      <p align="center">JULIO PEGUERO S&Aacute;NCHEZ-NAVARRO M.D.<SUP><B>a</B></SUP> AND ANA MAR&Iacute;A GONZ&Aacute;LEZ-ANGULO M.D., M.SC.<SUP><B>b</B></SUP>*</p>      <p><sup><b>a</b></sup> Department of Internal Medicine, Brackenridge Hospital, The University of Texas Medical Branch, M.D. Austin TX.     <br><sup><b>b</b></sup> Departments of Breast Medical Oncology and Systems Biology, The University of Texas, M.D. Anderson Cancer Center, Houston TX</p>      <p>* Correspondencia: <a href="mailto:agonzalez@mdanderson.org">agonzalez@mdanderson.org</a>. Direcci&oacute;n Postal: Department of Breast Medical Oncology, U.T. M.D. Anderson Cancer Center, 1515 Holcombe Blvd. Unit 1354, Houston, TX USA.</p>  <hr>      <p>Recibido: Septiembre 7 de 2008. Aceptado: Noviembre 12 de 2008.</p>      ]]></body>
<body><![CDATA[<p><b>Resumen</b></p>      <p>El c&aacute;ncer de mama triple receptor negativo es un subtipo de malignidad que no expresa los receptores de estr&oacute;geno y progesterona, ni tampoco la prote&iacute;na HER2. La mayor&iacute;a de estos tumores hacen parte del espectro denominado perfil gen&eacute;tico "basal", sin que los t&eacute;rminos sean sin&oacute;nimos ni intercambiables. La agresiva biolog&iacute;a que presenta este tumor requiere de un abordaje multidisciplinario. Todav&iacute;a esta por definirse la relaci&oacute;n entre el gen BRCA y el c&aacute;ncer de mama triple receptor negativo siendo esta un &aacute;rea creciente de investigaci&oacute;n. En Norteam&eacute;rica se ha identificado a la poblaci&oacute;n premenop&aacute;usica afro-americana como una de las etnias a riesgo para padecer este subtipo de neoplasia. La enfermedad es susceptible a quimioterapia convencional sin embargo el riesgo de recurrencia permanece bastante alto. Algunos de los blancos moleculares susceptibles incluyen el receptor del crecimiento del epitelio (EGFR), factor de crecimiento del endotelio vascular (VEGF) y la poli-adenosin difosfato-polimerasa (PARP).</p>     <p><b>Palabras clave</b>: c&aacute;ncer de mama, receptores estrog&eacute;nicos, receptores de progesterona</p>  <hr>      <p><b>Abstract</b></p>      <p>Triple negative breast cancer is a subtype of malignancy that does not express receptors for estrogen, progesterone or HER2NEU. The majority of these tumors form part of the "basal" genetic profile, but the terms are not synonymous or interchangeable. Because of their aggressive biology, they require a multidisciplinary approach. The relation between the BRCA gene and these tumors is still undefined and the subject of growing research. Premenopausal african americans have been identified in the United States as one of the ethnic groups at risk for this type of tumor. This neoplasm is sensitive to conventional chemotherapy but it remains at a high risk of recurrence. Some of the molecular targets include the epithelial growth factor receptors (EGFR), vascular endothelial growth factor (VGEF) and the poliadenosin-diphosphate-polimerase (PARP).</p>     <p><b>Key words</b>: breast neoplasm, receptors, estrogen, receptors, progesterone</p>  <hr>      <p><b>Resumo</b></p>      <p>O c&acirc;ncer de mama triplo receptor negativo &eacute; um subtipo de malignidade que n&atilde;o expressa os receptores de estr&oacute;geno e progesterona, como tamb&eacute;m n&atilde;o a prote&iacute;na HER2. A maioria destes tumores faz parte do espectro denominado perfil gen&eacute;tica "basal", sem que os termos sejam sin&ocirc;nimos nem intercambi&aacute;veis. A agressiva biologia que apresenta este tumor requer de uma abordagem multidisciplinar. Ainda esta por definir-se a rela&ccedil;&atilde;o entre o gene BRCA e o c&acirc;ncer de mama triplo receptor negativo sendo esta um &aacute;rea crescente de investiga&ccedil;&atilde;o. Em Norte Am&eacute;rica identificou- se &agrave; popula&ccedil;&atilde;o pr&eacute; menop&aacute;usica afro-americana como uma das etnias com risco para padecer este subtipo de neoplasia. A doen&ccedil;a &eacute; suscet&iacute;vel &agrave; quimioterapia convencional porem o risco de recorr&ecirc;ncia permanece bastante alto. Alguns dos alvos moleculares suscept&iacute;veis incluem; o receptor do crescimento do epitelio (EGFR), fator de crescimento do endotelio vascular (VEGF) e a poli-adenosin difosfato-polimerasa (PARP).</p>     <p><b>Palavras-chave</b>: neoplasia da mama, receptores estrog&ecirc;nicos, receptores de progesterona</p>  <hr>      <p>Se ha estimado que a m&aacute;s de un mill&oacute;n de mujeres se les diagnosticar&aacute; c&aacute;ncer de mama en el 2008 y que un subgrupo de esta cifra, 172.695 casos, corresponder&aacute; al llamado triple receptor negativo (1). El c&aacute;ncer de mama triple receptor negativo est&aacute; definido como un subtipo de malignidad caracterizado por la falta de expresi&oacute;n de receptores hormonales para estr&oacute;geno y progesterona, as&iacute; como para el receptor 2 del factor de crecimiento epid&eacute;rmico humano (HER2). Estos subtipos de tumores, fenotipicamente &uacute;nicos, tienen un pron&oacute;stico y un tratamiento espec&iacute;ficos. Para entender el tratamiento actual del c&aacute;ncer de mama hay que reconocer los cambios y hallazgos que a lo largo del tiempo se han ido dando. En la actualidad ya hay descripciones del perfil gen&eacute;tico de los tumores y de las diferentes caracter&iacute;sticas que &eacute;stos expresan. El an&aacute;lisis de las peculiaridades gen&eacute;ticas de los tumores es continuo (2), encontr&aacute;ndose en la literatura muchas publicaciones que determinan las caracter&iacute;sticas intr&iacute;nsecas del c&aacute;ncer de mama y que los dividen en tumores luminares, cuando expresan receptores hormonales, en tumores con niveles altos de HER2 y en tumores de tipo "basal", cuando expresan bajos niveles para receptores hormonales y para HER2, constituyendo &eacute;stos la mayor&iacute;a del fenotipo triple receptor negativo. Se han establecido diferencias marcadas, en t&eacute;rminos de pron&oacute;stico y tratamiento, para cada subtipo, resalt&aacute;ndose el hecho de que los tumores triple receptor negativo tienden a ser biol&oacute;gicamente m&aacute;s agresivos y de peor pron&oacute;stico (3,4). Estudios recientes tambi&eacute;n sugieren que el potencial metast&aacute;tico a &oacute;rganos viscerales, incluyendo sistema nervioso central, es tambi&eacute;n m&aacute;s evidente en el subtipo triple negativo (5,6) y a diferencia de los otros, es un subtipo que carece de tratamientos espec&iacute;ficos dirigidos a blancos moleculares. Por esta raz&oacute;n, la urgencia de desarrollar nuevos agentes para el tratamiento, m&aacute;s all&aacute; de la quimioterapia que existe hasta la fecha.</p>      ]]></body>
<body><![CDATA[<p>En este art&iacute;culo de revisi&oacute;n se mencionan los aspectos moleculares y cl&iacute;nico-patol&oacute;gicos del c&aacute;ncer de mama triple receptor negativo, los factores epidemiol&oacute;gicos y de riesgo, as&iacute; como las estrategias actuales y futuras para el manejo de los pacientes con esta patolog&iacute;a.</p>     <p><b>Definici&oacute;n y clasificaci&oacute;n</b></p>     <p>Es importante antes que todo, clarificar la relaci&oacute;n entre el fenotipo "triple negativo" y las caracter&iacute;sticas genot&iacute;picas del c&aacute;ncer mama basal. La palabra triple negativo es un t&eacute;rmino que se utiliza para identificar a pacientes con tumores que son estr&oacute;geno, progesterona y HER2 negativos, sin embargo, es una nomenclatura basada en m&eacute;todos de diagnostico convencional. Al mencionar la palabra "basal" se hace referencia a los tumores que han sido identificados mediante t&eacute;cnicas moleculares que analizan el ADN, por lo que de estos tumores se tiene informaci&oacute;n de sus caracter&iacute;sticas moleculares. La mayor&iacute;a de los tumores triple receptor negativo son de caracter&iacute;sticas gen&eacute;ticas basales, sin que exista una clasificaci&oacute;n totalmente absoluta, pues son diversas las opiniones en cuanto al mejor m&eacute;todo para clasificarlos (2,3). Aunque es cierto que la mayor&iacute;a de los tumores triple receptor negativo caen dentro del espectro basal, estos no son sin&oacute;nimos y existe al menos un 30% de discordancia entre ambas clasificaciones (7,10). Con estas consideraciones, nos referiremos al t&eacute;rmino triple receptor negativo, cuando las malignidades se han identificado por medios de diagn&oacute;stico convencionales y "basales", cuando se han utilizado t&eacute;cnicas de expresi&oacute;n gen&eacute;tica.</p>     <p><b>Aspectos moleculares</b></p>     <p>Las caracter&iacute;sticas moleculares de los diferentes subtipos de c&aacute;ncer mamario est&aacute;n divididas por regi&oacute;n histol&oacute;gica. Esta divisi&oacute;n incluye a las c&eacute;lulas epiteliales del lumen de la gl&aacute;ndula mamaria y las que provienen de la parte epitelial basal, expresando cada una diferentes biomarcadores. Las c&eacute;lulas del lumen tienden a expresar queratinas de bajo peso molecular CK7, CK8, CK18, CK19, MUC1, a-6-integrina, BCL1, RE, RP y GATA3. Hacia la topograf&iacute;a de las c&eacute;lulas basales, el mioepitelio de la gl&aacute;ndula mamaria tumoral expresa queratinas de alto peso molecular, CK5, CK14 y CK17, adem&aacute;s de biomarcadores de m&uacute;sculo liso, calponina, caldesmon, p63, beta 4 integrina, laminina, aspina, CD10, p-cadherina, caveolina-1, factor del receptor para el crecimiento del nervio (NGFR) y S100. Cl&aacute;sicamente, a diferencia de las lesiones gen&eacute;ticas luminares, las tumoraciones basales tienen una consistente falta de expresi&oacute;n de receptores de estr&oacute;geno y progesterona, del receptor 2 del factor de crecimiento epid&eacute;rmico humano (HER2) y una abundante expresi&oacute;n de CK5, CK14, caveolina-1, CAIX, p63 y del receptor del factor de crecimiento epid&eacute;rmico 1 (EGFR/ HER1) (1,17).</p>     <p>La lista de biomarcadores en los pacientes con triple receptor negativo es amplia y espec&iacute;ficamente se ha descrito una expresi&oacute;n de al menos un 60% del receptor transmembrana EGFR/HER1, lo que permite asumirlo como un atractivo blanco molecular terap&eacute;utico (10,18). Igualmente, los tumores "basales" tambi&eacute;n han demostrado considerablemente, la expresi&oacute;n de C-kit, un receptor tipo tirosin quinasa. En un estudio reciente en que se compara la expresi&oacute;n de C-kit en tumores basales con alta expresi&oacute;n de queratinas vs. tumores de baja expresi&oacute;n, los porcentajes de expresi&oacute;n de C-kit fueron del 31% vs. el 11% respectivamente (10). As&iacute; mismo es de considerarse la marcada expresi&oacute;n de la prote&iacute;na p53 en el fenotipo basal, sobre la que se ha reportado una expresi&oacute;n hasta del 82% en tumores basales, vs. tan s&oacute;lo un 13 % en los luminales, espec&iacute;ficamente el subtipo A (p&lt;0,001). Otros potenciales blancos moleculares est&aacute;n constituidos por las prote&iacute;nas mit&oacute;gena activada por v&iacute;a de las quinasas (MAP quinasa), la Akt y la adenosin difosfato ribosa poli-polimerasa 1 (PARP1) (8).</p>     <p><b>Enfermedad triple receptor negativo y el gen supresor BRCA1</b></p>     <p>La gran mayor&iacute;a de tumores BRCA 1 son triple receptor negativo y expresan en gran medida citoqueratinas basales (5,4,17) as&iacute; como p-cadeherina y Her1/EGFR (20,24). El gen supresor BRCA1 es una prote&iacute;na multifocal que se encuentra ubicada en el cromosoma 17q21. Tiene m&uacute;ltiples funciones como la reparaci&oacute;n de ADN, regulaci&oacute;n de la trascripci&oacute;n, control del ciclo celular y ubiquitinizaci&oacute;n (22,25). El gen supresor BRCA esta asociado a la reparaci&oacute;n del ADN y su explotaci&oacute;n como blanco molecular en el c&aacute;ncer de mama triple receptor negativo es prometedora.</p>     <p><b>Caracter&iacute;sticas cl&iacute;nicas, epidemiol&oacute;gicas y factores de riesgo</b></p>     <p>El c&aacute;ncer de mama triple receptor negativo tiende a ser biol&oacute;gicamente m&aacute;s agresivo, se presenta a m&aacute;s temprana edad, su tama&ntilde;o es generalmente m&aacute;s grande que el promedio del resto de tumores de mama y con alta frecuencia, sus agresivas caracter&iacute;sticas histol&oacute;gicas involucran ganglios linf&aacute;ticos (27,28). Un reciente estudio histol&oacute;gico acerca de tumores basales demuestra incremento en las cuentas mit&oacute;ticas, necrosis geogr&aacute;fica, rasgos obvios de invasi&oacute;n y respuesta linfocitaria del estroma (29), resultados que son descriptores morfol&oacute;gicos de la agresividad de este subtipo de malignidad. En cuanto a histog&eacute;nesis se refiere, la mayor&iacute;a de los tumores basales son del ducto mamario, existiendo otros fenotipos de caracter&iacute;sticas tambi&eacute;n agresivas que pertenecen al subtipo basal, como el metapl&aacute;sico, el medular at&iacute;pico y el qu&iacute;stico adenoideo (8,27,30).</p>     ]]></body>
<body><![CDATA[<p>Algunas de las especificidades epidemiol&oacute;gicas han sido descritas por el grupo Carolina Breast Cancer Study que evalu&oacute; a 500 mujeres con tumores basaloides definidos como (RE/RP, Her2neu- y CK 5/6+ y/o Her1+). De sus hallazgos concluyeron que las mujeres afro-americanas est&aacute;n en mayor riesgo de enfermedad triple receptor negativo que la mujeres de etnias no afroamericanas, con una prevalencia del 26% vs 16% respectivamente. Las pacientes premenop&aacute;usicas tambi&eacute;n se vieron mas afectadas (24% vs. 15%). En resumen, las pacientes afroamericanas premenop&aacute;usicas tienen m&aacute;s alto riesgo de padecer enfermedad triple receptor negativo, comparadas con mujeres postmenop&aacute;usicas de otra etnia; en t&eacute;rminos de prevalencia, las cifras variaron entre 39% vs 14% vs 16% respectivamente, p &lt;0,001 (27). Estos resultados fueron consistentes con varios estudios poblacionales a gran escala que mostraban al c&aacute;ncer de mama triple receptor negativo, como m&aacute;s frecuente en mujeres afroamericanas premenop&aacute;usicas (31,32).</p>     <p>Evaluando aproximadamente 1400 tumores, el grupo Carolina Breast Cancer Study tambi&eacute;n ha descrito algunos factores de riesgo para esta enfermedad. Encontraron por ejemplo, que los tumores de expresi&oacute;n basal se presentaban con m&aacute;s frecuencia en mujeres con menarquia a edad m&aacute;s temprana, m&uacute;ltiparas, edad temprana de embarazo, etapa de lactancia disminuida, incremento en el &iacute;ndice de masa corporal y en el &iacute;ndice de la raz&oacute;n entre cintura y cadera. Estos factores de riesgo se identificaron especialmente en el grupo de mujeres premenop&aacute;usicas y no en las pacientes con tumores del lumen (RE, RP + y her2neu-) (33). Otro grupo de estudio, el Polish Breast C&aacute;ncer Study, ha reportado una relaci&oacute;n inversamente proporcional entre la edad de menarquia y la incidencia de tumores basales, cuando se comparaban con los tumores de expresi&oacute;n gen&eacute;tica luminal subtipo A. Aunque no sean definitivas, ciertas medidas de prevenci&oacute;n podr&iacute;an aplicarse en las mujeres de alto riesgo, entre ellas promover el incremento en el periodo de lactancia y la disminuci&oacute;n la obesidad. Sin embargo, en cuanto al &iacute;ndice de masa corporal, el incremento de &eacute;ste se vio asociado a disminuci&oacute;n de las malignidades histogen&eacute;ticas del lumen, pero no a las basales (34).</p>     <p>Estas asociaciones nos hacen pensar en el manejo espec&iacute;fico de los subtipos fenot&iacute;picos, en cuanto a estrategias de intervenci&oacute;n en el terreno de la medicina preventiva, haciendo distinciones entre tumores del lumen y basales, pues al parecer, la literatura medica actual confirma que en un futuro, estas decisiones ser&aacute;n guiadas por las caracter&iacute;sticas propias del perfil molecular y gen&eacute;tico de estos tumores y sus respectivos factores de riesgo. A&uacute;n as&iacute; y aunque no sean definitivas, ciertas medidas de prevenci&oacute;n se podr&iacute;an aplicar en las mujeres de alto riesgo, entre ellas promover el incremento en el periodo de lactancia y la disminuci&oacute;n de la obesidad.</p>     <p><b>Pron&oacute;stico</b></p>     <p>El pron&oacute;stico sombr&iacute;o de la enfermedad triple receptor negativo se evidencia en publicaciones de varios grupos que han examinado las caracter&iacute;sticas gen&eacute;ticas y los subtipos moleculares basal vs. luminal (3,4). Son diferentes los m&eacute;todos de an&aacute;lisis que se han aplicado a los tumores basales (perfil gen&eacute;tico de 70 genes y la firma gen&eacute;tica de respuesta a las heridas), pero a pesar de la variaci&oacute;n metodol&oacute;gica, han sido homog&eacute;neos los resultados de mal pron&oacute;stico (35). As&iacute; mismo, la supervivencia tambi&eacute;n parece estar disminuida en los tumores basales comparados con los luminales. (27,28) En un reciente reporte canadiense se eval&uacute;o el riesgo de recurrencia y de muerte en un grupo de 1500 pacientes, encontr&aacute;ndose que los pacientes con enfermedad triple receptor negativo tuvieron recurrencias m&aacute;s frecuentes y un declinamiento cl&iacute;nico mucho m&aacute;s evidente al momento de recurrencia, en comparaci&oacute;n con los no triple receptor negativo (28).</p>     <p><b>Tratamiento</b></p>     <p>Tal y como se evidencia en varias investigaciones, agentes quimioterap&eacute;uticos tradicionales como antraciclinas y antraciclinas + taxanos se consideran como de primera l&iacute;nea, para el tratamiento del c&aacute;ncer de mama triple receptor negativo, teniendo en cuenta que los agentes de manipulaci&oacute;n hormonal y los bloqueadores de Her2 son completamente ineficaces, debido a la carencia de receptores. A&uacute;n as&iacute;, y sin importar que no se trate de un tumor totalmente quimiorresistente, el tratamiento de este fenotipo continua siendo un gran reto para el onc&oacute;logo (6,45,46). Recientemente, el grupo CALGB 9344 sugiri&oacute; beneficio para los pacientes que expresaban Her2neu, o que eran doble negativos (RE y Her2) y que se trataron de manera adyuvante, agregando taxanos al r&eacute;gimen basado en antraciclinas. Del grupo RE y Her2 negativo de ese estudio, la mayor&iacute;a pertenec&iacute;a al fenotipo molecular basaloide (47).</p>     <p>En un par de series recientes, se demuestra tambi&eacute;n neoadyuvancia y citosensibilidad en el grupo de tumoraciones basales comparadas con las luminales/RE+, cuando se utilizan antraciclinas y antracilinas + taxanos. En uno de los estudios, se compar&oacute; el r&eacute;gimen adriamicina/ciclociclofosfamida (AC), en 100 pacientes con diferentes expresiones gen&eacute;ticas (32% basales, 10% Her2+/RE- y 58% luminales (RE+)), encontr&aacute;ndose un 85% de respuesta en los tumores basales y un 70% en los Her2, contra una respuesta de tan s&oacute;lo el 47% en los luminales. A pesar de las diferencias en la respuesta inicial del tumor, la supervivencia libre de enfermedad (DFS), al igual que la supervivencia en general (OS), fue peor en el grupo de tumoraciones basales y Her2+, comparado con las lesiones luminares (DFS (p=0,04), OS (p=0,02)). En el segundo estudio se evaluaron m&aacute;s de 1.000 pacientes, el 23% de ellos con fenotipo basal, con tratamientos en neoadyuvancia basados en antraciclinas y taxanos y con resultados similares a los de otros estudios, que permitieron observar una alta correlaci&oacute;n en cuanto a remisi&oacute;n completa de la enfermedad (por an&aacute;lisis histopatol&oacute;gico) en pacientes triple receptor negativo y RE+ (22% vs 11% HR= 1,53, p= 0,34). El an&aacute;lisis de multivarianza de este estudio evidenci&oacute; que la enfermedad triple receptor negativo estaba asociada a disminuci&oacute;n de la supervivencia libre de progresi&oacute;n y a supervivencia en general, cuando se comparaba con la no triple receptor negativo (63% vs 76%; HR=1,86, p&lt;0,0001 y 74% vs 89%; HR= 2,53, p&lt;0.,000; respectivamente) (6). Aunque en ambas series los pacientes con remisi&oacute;n completa tuvieron excelentes resultados, el grupo con enfermedad residual, despu&eacute;s de la quimioterapia neoadyuvante, estaba en franco riesgo de recurrencia. Este pobre resultado se atribuy&oacute; en parte al alto grado de reincidencia en recurrencias, cuando los pacientes con enfermedad triple receptor negativo no consegu&iacute;an remisi&oacute;n completa. Parece entonces que aunque los pacientes con enfermedad triple receptor negativo son sensibles a regimenes quimioterap&eacute;uticos convencionales, se requiere de tratamientos de primera l&iacute;nea m&aacute;s efectivos, que incrementen los resultados histopatol&oacute;gicos de remisi&oacute;n completa y que mejoren las estad&iacute;sticas de supervivencia.</p>     <p>En recientes publicaciones sobre estudios precl&iacute;nicos y cl&iacute;nicos se indica que los tumores con mutaciones disfuncionales del gen supresor BRCA1 poseen mecanismos de reparaci&oacute;n de rupturas del ADN de doble cadena, que son sensibles a los agentes que causan lesiones directas al ADN (como ejemplo est&aacute;n el los platinos: carboplat&iacute;n y cisplatino) (48,49). Es as&iacute; como los estudios de asociaci&oacute;n entre el c&aacute;ncer de mama triple receptor negativo y las mutaciones BRCA1 que utilizan los platinos en neoadyuvancia, en adyuvancia y en met&aacute;stasis, demuestran eficaz actividad en los pacientes, aunque no se han hecho comparaciones con otros agentes citot&oacute;xicos (50-54).</p>     <p>Como aproximadamente un 60% de los tumores triple receptor negativo expresan EGFR, Her1, es notorio el inter&eacute;s de la comunidad cient&iacute;fica en estos nuevos blancos moleculares, estando identificados agentes anti-EGFR, antiangiog&eacute;nicos e inhibidores de poli ADP ribosa polimerasa (PARP). De ellos, el agente conocido como cetuximab (Erbitux, ImClone Systems Inc, Bristol-Meyers Squibb) se ha utilizado en pacientes con expresi&oacute;n de EGFR y aunque su efectividad como monoterapia es m&iacute;nima, actualmente hay un estudio en fase II en el que se eval&uacute;an los agentes cetuximab + carboplatino (&aacute;rea bajo la curva 2, semanalmente por 3 de 4 semanas). En este estudio la taza de respuesta que se ha reportado es del 18% y el beneficio cl&iacute;nico en general del 27%, en 102 pacientes con enfermedad avanzada previamente tratados. El tiempo de progresi&oacute;n ha sido de dos meses y la sobrevida en general de doce meses, hechos que hacen referencia al car&aacute;cter biol&oacute;gicamente agresivo del subtipo triple receptor negativo (55). En un segundo estudio se ha utilizado irinotecan y carboplatino con o sin cetuximab y las tazas de respuesta han sido del 19% y del 39% respectivamente, en 100 pacientes previamente tratados con quimioterapia. En este estudio fue notable la toxicidad en el grupo que recibi&oacute; cetuximab, con un de grado 3/4 neutropenia, diarrea, v&oacute;mito, fatiga y trombocitopenia (52).</p>     ]]></body>
<body><![CDATA[<p>El gen PARP1, que codifica para una enzima asociada a la cromatina y modificadora de varias prote&iacute;nas nucleares, tiene dentro de sus funciones la recuperaci&oacute;n celular del ADN da&ntilde;ado. Al inhibir el gen PARP1 se acumulan fragmentos de ADN, fen&oacute;meno celular que generalmente es reparado por la denominada v&iacute;a de recombinaci&oacute;n hom&oacute;loga HR y que funciona solamente en presencia de el gen supresor BRCA1 y 2, de tal forma que aquellas c&eacute;lulas que demuestran mutaciones en BRCA1 o 2, son particularmente sensibles a la inhibici&oacute;n de PARP1, en donde la manipulaci&oacute;n farmacol&oacute;gica basada en este modelo produce necrosis celular que lleva a apoptosis de la masa tumoral (56,57). Son varios los inhibidores del PARP1 que existen en la actualidad (AZD2281, BSvid01) y aunque se encuentran en fase experimental, parecen ser prometedores para los pacientes con mutaciones de BRCA1 y 2 (1,58,59).</p>     <p>El f&aacute;rmaco antiangiog&eacute;nico bevacizumab (Avastin, Genentech), un anticuerpo monoclonal dirigido espc&iacute;ficamente al receptor de crecimiento vascular endotelial (VEGFR), ha demostrado actividad en varias tumoraciones s&oacute;lidas, incluyendo c&aacute;ncer de mama. El estudio E2100 report&oacute; mejor&iacute;a en la supervivencia libre de progresi&oacute;n (PFS) (11,8 vs 5,9 meses, HR = 0,60; P&lt;0,01) cuando se agreg&oacute; bevazicumab a paclitaxel vs paclitaxel, como monoterapia de primera l&iacute;nea en la enfermedad metast&aacute;sica. Este efecto persisti&oacute; en el grupo de pacientes con receptores de estr&oacute;geno y progesterona negativo (HR=0,60; p&lt;0,001) y en los pacientes her2neu- que constitu&iacute;an m&aacute;s del 90% de la poblaci&oacute;n de pacientes (60). As&iacute; mismo, nuevos agentes moleculares inhibidores de esta v&iacute;a VEGF, est&aacute;n siendo estudiados en pacientes previamente tratados con marcadores triple receptor negativo (61,62). El papel de la angiog&eacute;nesis en este agresivo fenotipo molecular es significativo y muestra de ello es la iniciativa llevada a cabo por el grupo CALBG 40603, en el que se reclutar&aacute;n en el oto&ntilde;o de 2008, pacientes con enfermedad triple receptor negativo para observar la combinaci&oacute;n de carboplatino + paclitaxel y el beneficio de agregar bevazicumab en neoadyuvancia. Este estudio promete ser de mucho valor porque se analizar&aacute;n dos aspectos de suma importancia: el rol de los agentes tipo platino y la actividad de los antiangiog&eacute;nicos.</p>     <p><b>Conclusiones</b></p> <ul>     <li>El c&aacute;ncer de mama triple receptor negativo es biol&oacute;gicamente agresivo y pareciera que sus factores de riesgo son propios del fenotipo molecular que lo confiere.</li>     <li>Aunque se ha evidenciado sensibilidad de este tumor a agentes quimioterap&eacute;uticos como taxanos y antraciclinas, el porcentaje de pacientes con enfermedad residual es alto.</li>     <li>La asociaci&oacute;n del c&aacute;ncer de mama triple receptor negativo con mutaciones BRCA1 promete nuevas estrategias terap&eacute;uticas, como Inhibidores del PARP1 y el nicho de receptores (EGFR) (Rel) y (VEGFR), &uacute;tiles marcadores de exploraci&oacute;n para nuevas herramientas farmacol&oacute;gicas.</li>     </ul>      <p>El entendimiento del carcinoma de mama triple receptor negativo es una &aacute;rea creciente de investigaci&oacute;n que invita al cl&iacute;nico a dise&ntilde;ar futuros ensayos cl&iacute;nicos, para a la postre aplicar medidas apropiadas de prevenci&oacute;n y de tratamiento.</p> <hr>      <p><b>Referencias</b>     <!-- ref --><p>1. 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