<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0123-3475</journal-id>
<journal-title><![CDATA[Revista Colombiana de Biotecnología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. colomb. biotecnol]]></abbrev-journal-title>
<issn>0123-3475</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Biotecnología, Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0123-34752016000100014</article-id>
<article-id pub-id-type="doi">10.15446/rev.colomb.biote.v18n1.57723</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tratamiento de cáncer de seno y farmacogenética]]></article-title>
<article-title xml:lang="en"><![CDATA[Treatment of breast cancer and pharmacogenetics]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ariza Márquez]]></surname>
<given-names><![CDATA[Yeimy Viviana]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Briceño Balcázar]]></surname>
<given-names><![CDATA[Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ancízar Aristizábal]]></surname>
<given-names><![CDATA[Fabio]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional de Colombia Biotecnología ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de la Sabana  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional de Colombia Director Instituto de Biotecnología ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2016</year>
</pub-date>
<volume>18</volume>
<numero>1</numero>
<fpage>121</fpage>
<lpage>134</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0123-34752016000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0123-34752016000100014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0123-34752016000100014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El cáncer de seno es un grupo de enfermedades con gran impacto a nivel mundial dado que es una de las patologías con mayor prevalencia en mujeres y el cáncer con mayor tasa de mortalidad en varios países (GLOBOCAN 2012). El uso de la farmacogenética y farmacogenómica, en pacientes con cáncer de seno tiene como fin, generar una salud personalizada que permita tratar a cada paciente como individuo y no como enfermedad, pues cada paciente tiene necesidades particulares a la hora de suministrarle un tratamiento. El propósito de esta revisión es identificar las variantes genéticas reportadas en la literatura científica, donde se evalúan diferentes poblaciones y su posible uso como herramienta para medicina de precisión. En población colombiana es poca la caracterización poblacional que existe y por tanto estudios poblacionales son necesarios para definir los perfiles genéticos que deberán implementarse en nuestra población.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Breast cancer is one of the most prevalent diseases in women with increasing mortality in several countries (GLOBOCAN 2012). The use of pharmacogenetics and pharmacogenomics in patients with breast cancer allows generating personalized health for treating each patient as an individual, as each patient has unique needs when supplying a treatment. The purpose of this review is to identify genetic variants reported in the scientific literature, where different populations are evaluated and for possible use as a tool for medical precision. Colombian population is unique and therefore population studies are needed to define the genetic profiles to be implemented.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cáncer de seno]]></kwd>
<kwd lng="es"><![CDATA[farmacocinética]]></kwd>
<kwd lng="es"><![CDATA[tamoxifeno]]></kwd>
<kwd lng="es"><![CDATA[hormonoterapia]]></kwd>
<kwd lng="en"><![CDATA[breast cancer]]></kwd>
<kwd lng="en"><![CDATA[pharmacokinetic]]></kwd>
<kwd lng="en"><![CDATA[tamoxifen]]></kwd>
<kwd lng="en"><![CDATA[hormone therapy]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="Verdana">      <p>DOI: <a href="http://dx.doi.org/10.15446/rev.colomb.biote.v18n1.57723" target="_blank">http://dx.doi.org/10.15446/rev.colomb.biote.v18n1.57723</a></p>       <p align="right">ART&Iacute;CULO DE REVISI&Oacute;N</p>      <p align="center"><font size="4"><b>Tratamiento de c&aacute;ncer de seno y farmacogen&eacute;tica</b></font></p>      <p align="center"><font size="3"><b>Treatment of breast cancer and pharmacogenetics</b></font></p>      <p><i><b>Yeimy Viviana Ariza M&aacute;rquez</b></i><Sup>*</Sup><i><b>, Ignacio Brice&ntilde;o Balc&aacute;zar</b></i><Sup>**</Sup><i><b>, Fabio Anc&iacute;zar Aristiz&aacute;bal</b></i><Sup>***</Sup></p>       <p><sup>*</sup> cPh.D Biotecnolog&iacute;a. Universidad Nacional de Colombia, Sede Bogot&aacute;, Colombia. <a href="mailto:yvarizam@unal.edu.co">yvarizam@unal.edu.co</a>    <br>  <sup>**</sup> Profesor titular, Universidad de la Sabana y Pontificia Universidad Javeriana, Bogot&aacute;, Colombia. <a href="mailto:ignaciobb@unisabana.edu.co">ignaciobb@unisabana.edu.co</a>    <br>  <sup>***</sup> Ph.D., Director Instituto de Biotecnolog&iacute;a Universidad Nacional de Colombia, Sede Bogot&aacute;, Colombia. <a href="mailto:faaristizabalg@unal.edu.co">faaristizabalg@unal.edu.co</a></p>      <p><b>Recibido</b>: septiembre 18 de 2015 <b>Aprobado</b>: abril 12 de 2016 </p>  <hr>      ]]></body>
<body><![CDATA[<p><b>Resumen</b></p>     <p> El c&aacute;ncer de seno es un grupo de enfermedades con gran impacto a nivel mundial dado que es una de las patolog&iacute;as con mayor prevalencia en mujeres y el c&aacute;ncer con mayor tasa de mortalidad en varios pa&iacute;ses (GLOBOCAN 2012). El uso de la farmacogen&eacute;tica y farmacogen&oacute;mica, en pacientes con c&aacute;ncer de seno tiene como fin, generar una salud personalizada que permita tratar a cada paciente como individuo y no como enfermedad, pues cada paciente tiene necesidades particulares a la hora de suministrarle un tratamiento. El prop&oacute;sito  de esta revisi&oacute;n es identificar las variantes gen&eacute;ticas reportadas en la literatura cient&iacute;fica, donde se eval&uacute;an diferentes poblaciones y su posible uso como herramienta para medicina de precisi&oacute;n. En poblaci&oacute;n colombiana es poca la caracterizaci&oacute;n poblacional que existe y por tanto estudios poblacionales son necesarios para definir los perfiles gen&eacute;ticos que deber&aacute;n implementarse en nuestra poblaci&oacute;n.</p>      <p><b>Palabras clave</b>: c&aacute;ncer de seno, farmacocin&eacute;tica, tamoxifeno, hormonoterapia.</p>  <hr>      <p><b>Abstract</b></p>     <p> Breast cancer is one of the most prevalent diseases in women with increasing mortality in several countries (GLOBOCAN 2012). The use of pharmacogenetics and pharmacogenomics in patients with breast cancer allows generating personalized health for treating each patient as an individual, as each patient has unique needs when supplying a treatment. The purpose of this review is to identify genetic variants reported in the scientific literature, where different populations are evaluated and for possible use as a tool for medical precision. Colombian population is unique and therefore population studies are needed to define the genetic profiles to be implemented.</p>      <p><b>Key words</b>: breast cancer, pharmacokinetic, tamoxifen, hormone therapy.</p>  <hr>       <p><b>Definici&oacute;n y conceptos generales <b> de c&aacute;ncer de seno</b></b></p>      <p>El c&aacute;ncer de seno esta conformado por un grupo de neoplasias malignas que tiene su origen en la proliferaci&oacute;n acelerada a causa de p&eacute;rdida del control del ciclo celular  por alteraci&oacute;n en al menos uno de los siguientes genes: <i>BRCA1, BRCA2, P53 y PTEN</i>,  y en otros casos por razones desconocidas (Dunning <i>et al.</i>, 1999). Puede estar localizado a nivel de  los ductos o los lobulillos siendo el ductal el m&aacute;s frecuente. El t&eacute;rmino &laquo;Carcinoma <i>in situ</i>&raquo; se refiere al tipo de c&aacute;ncer que se encuentra confinado en la luz de los ductos o de los lobulillos glandulares, sin invadir los tejidos vecinos. Por su parte, el carcinoma invasivo prolifera hasta romper la llamada membrana basal y extenderse infiltrando los tejidos que rodean a los ductos y lobulillos mamarios, penetrando as&iacute; el tejido circundante (McCafferty <i>et al.,</i> 2009). </p>      <p><b>Epidemiologia</b></p>      <p> Se presenta tanto en hombres y mujeres, aunque el c&aacute;ncer de mama femenino es m&aacute;s frecuente. Las cifras reportadas para mortalidad por c&aacute;ncer de seno en el periodo del 2000- 2006 en Colombia fueron de 12.287 personas, con una tasa cruda de 8,3 anual y una tasa ajustada por edad de 9,2 anual (Pi&ntilde;eros <i>et al.,</i> 2010), adicionalmente, de acuerdo a lo reportado por GLOBOCAN (2012) la tasa de incidencia de c&aacute;ncer de seno en mujeres para Colombia fue del 23,4% (8.686 casos) y la tasa de mortalidad fue del 13,8% (2.649 defunciones) (Ferlay <i>et al</i>., 2012).</p>      ]]></body>
<body><![CDATA[<p><b>Clasificaci&oacute;n c&aacute;ncer de seno</b></p>      <p> Con el fin de clasificar los diferentes estadios de esta enfermedad se manejan diferentes esquemas, dentro de los que cabe mencionar,  el sistema TNM que  se basa en la clasificaci&oacute;n por tama&ntilde;o del tumor (T), si el tumor se ha diseminado a los ganglios linf&aacute;ticos (N), en las axilas o a&uacute;n no se ha diseminado, y si el tumor ha pasado a procesos metast&aacute;sicos (M) y por otro lado la  clasificaci&oacute;n anatomopatol&oacute;gica, dentro de la que se eval&uacute;a; el estado de los receptores hormonales, grado histol&oacute;gico y tama&ntilde;o. (Singletary <i>et </i><i>al.,</i> 2002). </p>      <p>Actualmente la clasificaci&oacute;n molecular es la m&aacute;s usada y est&aacute; basada en an&aacute;lisis de microarreglos, donde se estratifica el c&aacute;ncer mamario en cuatro subtipos: 1) luminal; 2) similar a basal; 3) similar a normal y 4) HER2/ERBB2, (Perou <i>et al.,</i> 2000; Sotiriou <i>et al.,</i> 2003; Rodr&iacute;guez <i>et al., </i>2016).</p>      <p>Para los procesos de clasificaci&oacute;n se emplean los receptores de superficie, que median procesos de transcripci&oacute;n celular. En la gl&aacute;ndula mamaria se expresan tres receptores importantes: receptor de estr&oacute;geno (RE), receptor de progesterona (RP) y receptor de factor de crecimiento epid&eacute;rmico humano 2 (HER2/neu). Estos receptores se encargan de llevar a cabo procesos de replicaci&oacute;n que en condiciones fisiol&oacute;gicas normales mantienen el equilibrio celular, pero en procesos tumorales permiten la replicaci&oacute;n de c&eacute;lulas tumorales que los sobre expresan y generan el r&aacute;pido crecimiento del tumor. Aquellas c&eacute;lulas que no tengan ninguno de estos receptores se denominan basales o triple negativas (Dent <i>et al.,</i> 2007).</p>      <p><b>Estado del receptor de estr&oacute;genos </b></p>      <p> Los c&aacute;nceres de seno se clasifican sobre la base de las necesidades de crecimiento como dependiente de estr&oacute;geno y  tumor independiente de estr&oacute;genos (Stoll BA., 1969; Furth J., 1975; Lacroix y Leclercq, 2004). Los RE hacen referencia a un grupo de receptores celulares que son activados por la hormona denominada 17&beta;-estradiol o estr&oacute;geno. Los RE son prote&iacute;nas intracelulares que al unirse a su ligando favorecen su translocaci&oacute;n al n&uacute;cleo e inducci&oacute;n de la expresi&oacute;n de genes espec&iacute;ficos. (De vita <i>et al</i>., 1984). Al bloquear la actividad de estas hormonas con terapia hormonal, se detiene el crecimiento de las c&eacute;lulas del c&aacute;ncer.</p>      <p><b>Estado de HER2</b>. Se refiere a un oncog&eacute;n que ayuda al crecimiento, divisi&oacute;n y reparaci&oacute;n celular. Cuando las c&eacute;lulas tienen demasiadas copias de este gen, las c&eacute;lulas (incluyendo las cancerosas) se multiplican m&aacute;s r&aacute;pidamente (Cabrera M. 2005; Piccart <i>et al.</i>, 2005; S&aacute;nchez <i>et al.</i>, 2008). Se sobre expresa en aproximadamente 25-30 % de las pacientes con c&aacute;ncer de seno. Esto est&aacute; asociado a un aumento en la actividad biol&oacute;gica del tumor. Las pacientes con c&aacute;ncer de mama que presentan amplificaci&oacute;n de HER2/neu presentan generalmente una forma m&aacute;s agresiva de c&aacute;ncer, adem&aacute;s de una mayor resistencia a tratamientos convencionales. Sin embargo, son pacientes que responden mejor al tratamiento combinado de quimioterapia con trastuzumab, un anticuerpo monoclonal humanizado que se dirige contra el dominio extracelular del receptor Her2/neu, aumentando la tasa de supervivencia de las pacientes (McCafferty <i>et al.,</i> 2009).</p>      <p>Actualmente mediante la identificaci&oacute;n de receptores hormonales se determina si las c&eacute;lulas cancerosas pueden reaccionar a un tratamiento en particular.</p>      <p>En la <a href="#fig1">figura 1</a>, se muestra la Gu&iacute;a de manejo de pacientes con c&aacute;ncer de seno del INC del 2013 donde se indican las opciones de tratamiento para pacientes con c&aacute;ncer de seno, estratific&aacute;ndolo en no invasivo, localmente diseminado y metast&aacute;sico. </p>      <p align="center"><a name="fig1"><img src="img/revistas/biote/v18n1/v18n1a14f1.jpg"></a></p>      ]]></body>
<body><![CDATA[<p>La terapia local tiene como objetivo tratar el tumor en un sitio espec&iacute;fico, sin afectar el resto del cuerpo. La cirug&iacute;a y la radioterapia son ejemplos de terapias locales (Rosenberg, S. A., 2000).</p>      <p>La terapia sist&eacute;mica se administra por v&iacute;a oral o directamente en el torrente sangu&iacute;neo para llegar a las c&eacute;lulas cancerosas que se hayan podido propagar m&aacute;s all&aacute; del seno. La quimioterapia, terapia hormonal y inmunoterapia son terapias sist&eacute;micas.</p>      <p>Dentro de las alternativas de tratamiento se encuentran medidas quir&uacute;rgicas que contemplan lumpectom&iacute;a, cuadrantectom&iacute;a, mastectom&iacute;a y mastectom&iacute;a bilateral, por otro lado la radioterapia, la quimioterapia y la hormonoterapia,  son alternativas que suelen usarse de manera combinada.</p>      <p>Para el prop&oacute;sito de esta revisi&oacute;n nos centraremos en los polimorfismos identificados en respuesta a hormonoterapia y quimioterap&eacute;uticos.</p>      <p><b>Descripci&oacute;n de los principales hormono terap&eacute;uticos</b>: Los medicamentos de hormonoterapia  que se usan para tratar el c&aacute;ncer de seno con receptores de hormonas positivos act&uacute;an de dos formas (<a href="#fig2">figura 2</a>):</p>      <p align="center"><a name="fig2"><img src="img/revistas/biote/v18n1/v18n1a14f2.jpg"></a></p>  <ul>    <li>    <p>Reducci&oacute;n de la concentraci&oacute;n de estr&oacute;geno en el cuerpo.</p></li>      <li>    <p>Bloqueo de la acci&oacute;n del estr&oacute;geno en las c&eacute;lulas del c&aacute;ncer de seno.</p></li>    ]]></body>
<body><![CDATA[</ul>      <p>Los medicamentos indicados para la hormonoterapia tambi&eacute;n pueden utilizarse para ayudar a reducir o desacelerar el crecimiento del c&aacute;ncer de seno <i>in </i><i>situ,</i> en estado avanzado o  metast&aacute;sico con receptores hormonales positivos.</p>      <p>Existen varios tipos de medicamentos de hormonoterapia, entre los que se incluyen: inhibidores de aromatasa (IA), moduladores selectivos de los receptores de estr&oacute;geno y antagonistas del receptor de estr&oacute;geno, (<a href="#fig2">figura 2</a>), a continuaci&oacute;n se describen cada uno de ellos.</p>      <p><b>Inhibidores de aromatasa</b></p>      <p> Detienen la producci&oacute;n de estr&oacute;geno en mujeres postmenop&aacute;usicas, mediante el bloqueo de la enzima aromatasa (ver <a href="#fig2">figura 2</a>), que convierte el andr&oacute;geno en peque&ntilde;as concentraciones de estr&oacute;geno en el cuerpo. Los inhibidores de aromatasa no pueden impedir que los ovarios produzcan estr&oacute;geno, por lo que solamente son adecuados para mujeres postmenop&aacute;usicas.</p>      <p>Los agentes anti aromatasas se clasifican en 2 grupos:</p>      <p>Inhibidores e inactivadores de aromatasas. Los inhibidores se unen de forma transitoria a la aromatasa y los inactivadores se unen de forma permanente a la enzima. En la actualidad est&aacute;n aprobados 2 inhibidores:</p>   <ul>    <li>    <p>Arimidex (nombre gen&eacute;rico: anastrozol)</p></li>      <li>    ]]></body>
<body><![CDATA[<p>Femara (nombre gen&eacute;rico: letrozol)</p></li>    </ul>      <p>Y un inactivador de aromatasas:</p>  <ul>    <li>Aromasin (nombre gen&eacute;rico: exemestano)</li>    </ul>       <p><b>Moduladores selectivos de los receptores <b> de estr&oacute;geno (MSRE)</b></b></p>      <p>Son agentes que se unen al receptor de estr&oacute;geno donde simulan la actividad de los estr&oacute;genos en ciertos tejidos, mientras inhiben su acci&oacute;n en otros. Los MSRE tienen una variada actividad: compuestos con actividad totalmente agonista, como la hormona end&oacute;gena estr&oacute;geno; compuestos con actividad agonista en algunos tejidos y antagonista en otros, como el tamoxifeno.</p>      <p><b>Tamoxifeno</b></p>      <p> Es un modulador selectivo de los receptores de estr&oacute;genos. Su mecanismo de acci&oacute;n se basa en su efecto antiestrog&eacute;nico, bloquea la acci&oacute;n de esta hormona que estimula el desarrollo de las c&eacute;lulas tumorales (<a href="#fig2">figura 2</a>). Su acci&oacute;n no se limita a la mama, pues diferentes &oacute;rganos tienen receptores para estr&oacute;genos. En el &uacute;tero  (<a href="#fig2">figura 2</a>) tiene  un efecto agonista estrog&eacute;nico y en el hueso mejora la asimilaci&oacute;n de calcio, por lo que es beneficioso en la osteoporosis.</p>      <p>El tamoxifeno es considerado como un prof&aacute;rmaco ya que necesita ser transformado a sus respectivos metabolitos, los cuales son los responsables de su actividad farmacol&oacute;gica. Este f&aacute;rmaco tiene metabolismo primario y secundario el cual se lleva a cabo en el h&iacute;gado, principalmente por las enzimas del citocromo P450, (<a href="#fig3">figura 3</a>). (Higgins<i> et al., </i>2009 y Goetz <i>et al., </i>2005).Y dependiendo la integridad de los diversos citocromos los pacientes pueden ser caracterizados como metabolizador ultrarr&aacute;pido (UM), metabolizador normal (EM), metabolizador intermedio (IM) y metabolizador lento (PM) (Rodriguez e<i> </i>Ingelman<i>.,</i> 2006).</p>      ]]></body>
<body><![CDATA[<p align="center"><a name="fig3"><img src="img/revistas/biote/v18n1/v18n1a14f3.jpg"></a></p>      <p>El N-desmetiltamoxifeno es el metabolito m&aacute;s abundante sin embargo no es el responsable de la actividad de tamoxifeno; el metabolito 4-hidroxitamoxifeno representa menos del 10 % de la oxidaci&oacute;n primaria de tamoxifeno catalizada por las enzimas CYP3A4 y CYP3A5, (figura 3)  sin embargo se considera que su papel en el efecto farmacol&oacute;gico es muy importante ya que tiene un efecto antiestrog&eacute;nico 100 veces superior al del tamoxifeno. Estudios han demostrado que hay otro metabolito, el 4-hidroxi-N-desmetil tamoxifeno (endoxifeno) el cual es formado a partir de la oxidaci&oacute;n de N-desmetiltamoxifeno catalizado por la enzima CYP2D6; endoxifeno es m&aacute;s importante que 4-hidroxitamoxifeno ya que contribuye de manera m&aacute;s significativa en el efecto total anticanceroso de tamoxifeno, por lo tanto es el responsable de la actividad de este f&aacute;rmaco. (Goetz <i>et al.,</i> 2005). </p>      <p><b>Antagonistas del receptor de estr&oacute;geno (ARE)</b></p>      <p> Los antagonistas del receptor de estr&oacute;geno (ARE) bloquean los efectos del estr&oacute;geno en el tejido mamario. Los ARE funcionan de una forma similar a los (MSRE). Los ARE se unen a los receptores del estr&oacute;geno en las c&eacute;lulas mamarias. Si un ARE se une al receptor del estr&oacute;geno, no hay espacio suficiente para que el estr&oacute;geno se acople a la c&eacute;lula (<a href="#fig2">figura 2</a>). Si el estr&oacute;geno no est&aacute; unido a la c&eacute;lula de la mama, la c&eacute;lula no recibe las se&ntilde;ales del estr&oacute;geno que le indican que debe crecer y multiplicarse. Adem&aacute;s, los ARE tienen otros beneficios:</p>  <ul>    <li>    <p>Reducen la cantidad de receptores de estr&oacute;geno.</p></li>     <li>    <p>Cambian la forma de los receptores de estr&oacute;geno en las c&eacute;lulas mamarias</p></li>    </ul>     <p>Hay un ARE disponible para tratar el c&aacute;ncer de mama de receptores de hormonas positivos:</p>      ]]></body>
<body><![CDATA[<p><b>Faslodex (nombre gen&eacute;rico: fulvestrant)</b></p>      <p> Fulvestrant es un medicamento que act&uacute;a por efecto antagonista sobre los receptores de estr&oacute;geno y se encuentra indicado para tratar a mujeres en edad postmenop&aacute;usica que presenten c&aacute;ncer de mama en fase avanzada, &uacute;nicamente en caso de que el tumor tenga receptores hormonales positivos y la enfermedad no responda a otros medicamentos bloqueantes de estr&oacute;genos, como el tamoxifeno. El mecanismo de acci&oacute;n del f&aacute;rmaco se basa en inactivar la acci&oacute;n de los estr&oacute;genos. El medicamento se presenta en forma de soluci&oacute;n para administrar por v&iacute;a intramuscular, la dosis habitual es 500 mg una vez al mes. Los efectos secundarios m&aacute;s frecuentes que se han observado consisten en dolor de cabeza, sensaci&oacute;n de sofoco, v&oacute;mitos o diarrea, erupci&oacute;n cut&aacute;nea, dolor de espalda, reacciones al&eacute;rgicas, aumento de los niveles de bilirrubina en sangre, fallo hep&aacute;tico, sensaci&oacute;n de cansancio y riesgo aumentado de tromboembolismo.</p>      <p>Por otra parte, trastuzumab (comercializado con la marca Herceptin&reg;) es un anticuerpo monoclonal humanizado. El trastuzumab se une selectivamente al receptor HER2. El HER2 se sobre expresa en la superficie de algunas c&eacute;lulas cancerosas y estimula la proliferaci&oacute;n de &eacute;stas c&eacute;lulas. Cuando el trastuzumab se une al HER2 inhibe la proliferaci&oacute;n celular. Trastuzumab se emplea en el tratamiento de pacientes con c&aacute;ncer de seno que tienen expresi&oacute;n positiva del oncogen HER2. El trastuzumab es un producto biotecnol&oacute;gico producido en c&eacute;lulas de ovario de h&aacute;mster chino (CHO) en cultivo.</p>      <p>Luego de revisar las diferentes alternativas de tratamiento y evaluando el esquema de manejo propuesto por el INC en el 2013, el hormonoterap&eacute;utico de primera elecci&oacute;n es tamoxifeno, como previamente se sugiri&oacute; en un estudio de costo-efectividad, donde se estableci&oacute; tamoxifeno como la mejor alternativa para Colombia (Chica&iacute;za, 2008) por otra parte los reg&iacute;menes de quimioterapia est&aacute;n basados en antraciclinas asociados o no con taxanos. De manera que en el contexto de respuesta  a tratamiento es importante tener en cuenta todos los factores que pueden incidir en la respuesta a tratamiento en una paciente con c&aacute;ncer de seno, para esto es preciso evaluar factores tales como condiciones subyacentes, caracter&iacute;sticas propias del f&aacute;rmaco y farmacogen&eacute;ticos de cada paciente (<a href="#fig4">figura 4</a>). </p>      <p align="center"><a name="fig4"><img src="img/revistas/biote/v18n1/v18n1a14f4.jpg"></a></p>      <p>Diversas condiciones pueden incidir en la respuesta a hormonoterapia, es el caso del estudio realizado por Simonsson <i>et al.,</i> (2013) donde se encontr&oacute; que un moderado y alto consumo de caf&eacute; se asocia con una disminuci&oacute;n significativa del riesgo de los primeros eventos en los pacientes tratados con tamoxifeno y el estado de los receptores hormonales. Si se confirma, quiz&aacute;s se justifique nuevas recomendaciones en relaci&oacute;n con el consumo de caf&eacute; durante el tratamiento con tamoxifeno. Igualmente diversas publicaciones indican que la epigen&eacute;tica tambi&eacute;n incide en la respuesta a hormonoterap&eacute;uticos como el tamoxifeno. (Eccles <i>et al</i>., 2013, Pathiraja,  <i>et al.,</i> 2010, Van't Veer <i>et al.,</i> 2002).</p>      <p>En la <a href="#tab1">tabla 1</a> se citan los principales polimorfismos asociados a respuesta en los diferentes tratamientos de hormonoterapia en pacientes con c&aacute;ncer de seno.</p>      <p align="center"><a name="tab1"><a href="img/revistas/biote/v18n1/v18n1a14t1.jpg" target="_blank">Ver Tabla 1</a></a></p>      <p>Como se mencion&oacute; previamente las frecuencias al&eacute;licas de CYP2D6 var&iacute;an entre poblaciones, muchas de las cuales est&aacute;n recopiladas en la base de datos "CYP2D6 allele nomenclature"pero algunas a&uacute;n no han sido incluidas, por esta raz&oacute;n en la <a href="#tab2">tabla 2</a> se indican las que se han reportado despu&eacute;s del 9-Dec-2014  que no est&aacute;n incluidas en "CYP2D6 allele nomenclature". (PharmGKB&nbsp;<i>CYP2D6</i>&nbsp;Allelic Variation Summary)</p>      <p align="center"><a name="tab2"><a href="img/revistas/biote/v18n1/v18n1a14t2.jpg" target="_blank">Ver Tabla 2</a></a></p>      ]]></body>
<body><![CDATA[<p>Por otra parte el tratamiento con quimioterapia en c&aacute;ncer de seno  incluye la combinaci&oacute;n de diferentes medicamentos. Los protocolos basados en antraciclinas se han convertido en el est&aacute;ndar de quimioterapia adyuvante y neoadyuvante para la mayor&iacute;a de pacientes, esto basados en las evidencias cl&iacute;nicas de eficacia en comparaci&oacute;n con otros protocolos utilizados previamente (Hassan <i>et al.,</i> 2010). Recientemente, taxanos, como docetaxel y paclitaxel, fueron incluidos en los protocolos basados en antraciclinas, mostrando reducci&oacute;n  en el riesgo a recurrencia (De Laurentiis <i>et al.,</i> 2008; Martin <i>et al.,</i> 2010; Jacquin <i>et al.,</i> 2012). </p>      <p><b>Quimioterap&eacute;uticos</b></p>      <p> Dentro de la clasificaci&oacute;n de los quimioterap&eacute;uticos describiremos las caracter&iacute;sticas de los m&aacute;s usados: est&aacute;n los agentes alquilantes que tienen su efecto directamente sobre el ADN evitando la reproducci&oacute;n de las c&eacute;lulas cancerosas, no son espec&iacute;ficos de la fase; en otras palabras, act&uacute;an en todas las fases del ciclo celular. Por ejemplo la ciclofosfamida (Cytoxan&reg;),  carboplatino y oxaliplatino.</p>      <p>Antimetabolitos, interfieren con el crecimiento del ADN y del ARN al sustituir la s&iacute;ntesis de purinas y pirimidinas. Estos agentes da&ntilde;an las c&eacute;lulas durante la fase S. Por ejemplo 5-fluorouracilo (5-FU), metrotexato.</p>      <p>Antraciclinas son antibi&oacute;ticos contra el c&aacute;ncer que interfieren con las topoisomerasas fundamentales en la replicaci&oacute;n de ADN. Estos medicamentos ejercen su acci&oacute;n en todas las fases del ciclo celular. Por ejemplo Doxorrubicina (Adriamycin&reg;) y Epirubicina (Ellence<Sup>&reg;</Sup>).</p>      <p>Inhibidores de la mitosis, son alcaloides de origen vegetal y otros compuestos derivados de productos naturales. Pueden detener la mitosis mediante su acci&oacute;n en los microtubulos. Son ejemplo Taxenos: paclitaxel (Taxol&reg;) y docetaxel (Taxotere&reg;).</p>      <p>Los protocolos de quimioterapia para c&aacute;ncer de seno  que se emplean actualmente son:</p>  <ul>    <li>    <p>CMF: ciclofosfamida , metotrexato, y 5-FU.</p></li>      <li>    ]]></body>
<body><![CDATA[<p>CAF (o FAC): ciclofosfamida, doxorrubicina y 5-FU.</p></li>      <li>    <p>AC: doxorrubicina  y ciclofosfamida.</p></li>      <li>    <p>EC: epirrubicina y ciclofosfamida.</p></li>      <li>    <p>TAC: docetaxel , doxorrubicina y ciclofosfamida.</p></li>      <li>    <p>AC &rarr; T: doxorrubicina y ciclofosfamida seguida de paclitaxel  o docetaxel.</p></li>    </ul>      ]]></body>
<body><![CDATA[<p>Trastuzumab (Herceptin) se puede administrar con el paclitaxel o el docetaxel para tumores HER2/neu positivos.</p>  <ul>    <li>    <p>A &rarr; CMF: doxorrubicina, seguida de CMF.</p></li>      <li>    <p>CEF (FEC): ciclofosfamida, epirrubicina y 5-FU (a esto le puede seguir docetaxel).</p></li>      <li>    <p>TC: docetaxel  y ciclofosfamida.</p></li>      <li>    <p>TCH: docetaxel, carboplatino, y trastuzumab, para tumores HER2/neu positivos.</p></li>    </ul>      ]]></body>
<body><![CDATA[<p>Algunos otros medicamentos de quimioterapia que se usan para tratar a pacientes con c&aacute;ncer de seno incluyen cisplatino, vinorelbina (Navelbine&reg;), capecitabina (Xeloda&reg;), doxorrubicina liposomal (Doxil&reg;), gemcitabina (Gemzar&reg;), mitoxantrona, exabepilona (Ixempra&reg;), paclitaxel basado en alb&uacute;mina (Abraxane&reg;) y eribulina (Halaven&reg;). Los medicamentos de terapia dirigida trastuzumab y lapatinib (Tykerb&reg;) se pueden usar con estos medicamentos de quimioterapia para tumores que son HER2/neu positivos (Marsha S. y Liu G., 2009). </p>      <p>Las variantes gen&eacute;ticas asociadas a respuesta a quimioterap&eacute;uticos son diversas y varian entre poblaciones (<a href="#tab3">tabla 3</a>).</p>      <p align="center"><a name="tab3"><a href="img/revistas/biote/v18n1/v18n1a14t3.jpg" target="_blank">Ver Tabla 3</a></a></p>      <p>Por otra parte, en la actualidad se encuentran test autorizados para ser practicados en mujeres con c&aacute;ncer de seno; OncotypeDX&reg;, MammaPrint&reg;, AmpliChip CYP450&reg;, Hercep Test&trade; y Endopredict&reg;, (Rodr&iacute;guez <i>et </i><i>al.,</i> 2016)  que ayudan a tomar  decisiones con respecto a tratamiento, pero que para poblaci&oacute;n nacional presentan un costo alto y no existe una validaci&oacute;n en poblaci&oacute;n colombiana que permita garantizar, costo efectividad total.</p>      <p><b>Conclusiones</b></p>      <p> La variabilidad humana hace necesario caracterizar cada poblaci&oacute;n, para obtener la descripci&oacute;n de los polimorfismos gen&eacute;ticos asociadas con diferentes desenlaces, en  farmacogen&eacute;tica conocer la frecuencia de variantes propias de poblaci&oacute;n colombiana en diversas enzimas asociadas a respuesta a medicamentos usados en el tratamiento de c&aacute;ncer de seno permitir&aacute; identificar patrones para prescribir un tratamiento que realmente pueda ser asimilado, evitando de este modo la presentaci&oacute;n de efectos adversos ocasionados por toxicidad fuera del blanco y en aquellos que se identifique un genotipo pobre metabolizador se podr&aacute;n implementar ajustes de dosis u otros esquemas de tratamiento. Teniendo en cuenta que el tamoxifeno es el hormono terap&eacute;utico de primera elecci&oacute;n, se hace necesario evaluar los polimorfismos presentes en <i>CYP2D6, </i> para realizar la categorizaci&oacute;n de las pacientes en metabolizadoras lentas, intermedias o ultra r&aacute;pidas. Una vez identificado su fenotipo se podr&aacute; prescribir el tratamiento adecuado. </p>      <p>Una vez identificadas las variantes gen&eacute;ticas frecuentes en poblaci&oacute;n colombiana, esta informaci&oacute;n permitir&aacute;n generar "kits en casa" que incluyan las variantes cl&iacute;nicas m&aacute;s relevantes y frecuentes, a un costo m&aacute;s accesible que permita realizar un tamizaje previo a suministrar un determinado tratamiento, generando la posibilidad de efectuar direccionamiento terap&eacute;utico. Se requiere caracterizar nuestra poblaci&oacute;n pues solo cuando conozcamos las particularidades de nuestra poblaci&oacute;n podremos generar soluciones a medida que nos acercaran a una medicina de precisi&oacute;n.</p>  <hr>      <p><b>Referencias bibliogr&aacute;ficas</b></p>     <!-- ref --><p> Baldwin, R. M., Owzar, K., Zembutsu, H., Chhibber, A., Kubo, M., Jiang, C., ... &amp; Friedman, P. N. (2012). A genome-wide association study identifies novel loci for paclitaxel-induced sensory peripheral neuropathy in CALGB 40101. <i>Clinical Cancer Re</i><i>search</i>, <i>18</i>(18), 5099-5109.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2407112&pid=S0123-3475201600010001400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>      ]]></body>
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