<?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>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402014000100005</article-id>
<article-id pub-id-type="doi">10.1016/j.acmx.2013.11.003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Farmacogenómica cardiovascular]]></article-title>
<article-title xml:lang="en"><![CDATA[Cardiovascular pharmacogenomics]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Scibona]]></surname>
<given-names><![CDATA[Paula]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Angriman]]></surname>
<given-names><![CDATA[Federico]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Simonovich]]></surname>
<given-names><![CDATA[Ventura]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Heller]]></surname>
<given-names><![CDATA[Martina M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Belloso]]></surname>
<given-names><![CDATA[Waldo H.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Italiano de Buenos Aires Departamento de Medicina Servicio de Clínica Médica]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Buenos Aires Facultad de Medicina Cátedra de Farmacología]]></institution>
<addr-line><![CDATA[Buenos Aires ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2014</year>
</pub-date>
<volume>84</volume>
<numero>1</numero>
<fpage>25</fpage>
<lpage>31</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402014000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402014000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402014000100005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La enfermedad cardiovascular representa la primera causa de morbimortalidad a nivel mundial. Actualmente, la evidencia que sustenta la implementación de determinadas intervenciones terapéuticas se origina a partir de datos provenientes de grupos poblacionales. Sin embargo, los pacientes presentan variaciones interindividuales relacionadas tanto con la eficacia como con la toxicidad ante un mismo tratamiento farmacológico. Estas variaciones pueden ser explicadas principalmente por diferencias en la adherencia, interacciones no reconocidas y diferencias genéticas. Las alteraciones en el genoma explican entre un 20 y un 95% de la variabilidad interindividual tanto en la disponibilidad como en la respuesta a fármacos. En el tratamiento de las enfermedades cardiovasculares existen diversos ejemplos de dicha variabilidad genética interindividual y su impacto en la eficacia o toxicidad de diferentes fármacos. La variabilidad genética que determina la respuesta al clopidogrel radica fundamentalmente en el polimorfismo del citocromo (CYP) 2C19. Los polimorfismos en los genes CYP 2C9 y VKORC1 explican gran parte de la variabilidad en la respuesta a los anticoagulantes dicumarínicos. Con respecto al tratamiento hipolipidemiante, el polimorfismo del gen SLCO1B1 se ha asociado a la aparición de miopatía en pacientes tratados con simvastatina. Muchos otros polimorfismos han sido postulados pero sin un impacto clínico definido hasta la fecha. La utilización de la farmacogenómica en la práctica cotidiana ofrece la oportunidad de poder predecir toxicidad o eficacia terapéutica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Cardiovascular disease remains a major cause of morbidity and mortality worldwide. Current medical practice takes into account information based on population studies and benefits observed in large populations or cohorts. However, individual patients present great differences in both toxicity and clinical efficacy that can be explained by variations in adherence, unknown drug to drug interactions and genetic variability. The latter seems to explain from 20% up to 95% of patient to patient variability. Treating patients with cardiovascular disorders faces the clinician with the challenge to include genomic analysis into daily practice. There are several examples within cardiovascular disease of treatments that can vary in toxicity or clinical usefulness based on genetic changes. One of the main factors affecting the efficacy of Clopidogrel is the phenotype associated with polymorphisms in the gene CYP 2C9. Furthermore, regarding oral anticoagulants, changes in CYP2C9 and VKORC1 play an important role in changing the clinical response to anticoagulation. When analyzing statin treatment, one of their main toxicities (myopathy) can be predicted by the SLCO1B1 polymorphism. The potential for prediction of toxicity and clinical efficacy from the use of genetic analysis warrants further studies aiming towards its inclusion in daily clinical practice.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Farmacogenómica]]></kwd>
<kwd lng="es"><![CDATA[Polimorfismo]]></kwd>
<kwd lng="es"><![CDATA[Clopidogrel]]></kwd>
<kwd lng="es"><![CDATA[Warfarina]]></kwd>
<kwd lng="es"><![CDATA[Estatinas]]></kwd>
<kwd lng="es"><![CDATA[Argentina]]></kwd>
<kwd lng="en"><![CDATA[Pharmacogenomic]]></kwd>
<kwd lng="en"><![CDATA[Polymorphism]]></kwd>
<kwd lng="en"><![CDATA[Clopidogrel]]></kwd>
<kwd lng="en"><![CDATA[Warfarin]]></kwd>
<kwd lng="en"><![CDATA[Statin]]></kwd>
<kwd lng="en"><![CDATA[Argentina]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culo de revisi&oacute;n</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="center"><font face="verdana" size="4"><b>Farmacogen&oacute;mica cardiovascular</b></font></p>              <p align="center"><font face="verdana" size="2">&nbsp;</font></p>              <p align="center"><font face="verdana" size="3"><b>Cardiovascular pharmacogenomics</b></font></p>              <p align="center"><font face="verdana" size="2">&nbsp;</font></p>              <p align="center"><font face="verdana" size="2"><b>Paula Scibona<sup>a</sup>, Federico Angriman<sup>a</sup> <sup>b</sup> *, Ventura Simonovich<sup>a</sup>, Martina M. Heller<sup>a</sup> y Waldo H. Belloso<sup>a</sup><sup>b</sup></b></font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><i><sup>a</sup> Secci&oacute;n de Farmacolog&iacute;a Cl&iacute;nica, Servicio de Cl&iacute;nica M&eacute;dica, Departamento de Medicina, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina</i></font></p>              <p align="justify"><font face="verdana" size="2"><i><sup>b</sup> C&aacute;tedra de Farmacolog&iacute;a, Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina</i></font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>* Autor para correspondencia:</b>     <br>     Hospital Italiano de Buenos Aires.     <br>     Gascon 450. Buenos Aires. Argentina.     <br>     Tel&eacute;fono/Fax: +49590200.     <br>     Correo electr&oacute;nico: <a href="mailto:federico.angriman@hospitalitaliano.org.ar">federico.angriman@hospitalitaliano.org.ar</a> (F. Angriman).</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2">Recibido el 27 de junio de 2013    <br>     Aceptado el 12 de noviembre de 2013</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>              <p align="justify"><font face="verdana" size="2">La enfermedad cardiovascular representa la primera causa de morbimortalidad a nivel mundial. Actualmente, la evidencia que sustenta la implementaci&oacute;n de determinadas&nbsp;intervenciones terap&eacute;uticas se origina a partir de datos provenientes de grupos poblacionales. Sin embargo, los pacientes presentan variaciones interindividuales relacionadas tanto con la&nbsp;eficacia como con la toxicidad ante un mismo tratamiento farmacol&oacute;gico. Estas variaciones&nbsp;pueden ser explicadas principalmente por diferencias en la adherencia, interacciones no reconocidas y diferencias gen&eacute;ticas. Las alteraciones en el genoma explican entre un 20 y un 95% de la variabilidad interindividual tanto en la disponibilidad como en la respuesta a f&aacute;rmacos. En el tratamiento de las enfermedades cardiovasculares existen diversos ejemplos de dicha variabilidad gen&eacute;tica interindividual y su impacto en la eficacia o toxicidad de diferentes f&aacute;rmacos. La variabilidad gen&eacute;tica que determina la respuesta al clopidogrel radica fundamentalmente en el polimorfismo del citocromo (CYP) 2C19. Los polimorfismos en los genes <i>CYP 2C9</i> y <i>VKORC1</i> explican gran parte de la variabilidad en la respuesta a los anticoagulantes dicumar&iacute;nicos. Con respecto al tratamiento hipolipidemiante, el polimorfismo del gen <i>SLCO1B1</i> se ha asociado a la aparici&oacute;n de miopat&iacute;a en pacientes tratados con simvastatina. Muchos otros polimorfismos han sido postulados pero sin un impacto cl&iacute;nico definido hasta la fecha. La utilizaci&oacute;n de la farmacogen&oacute;mica en la pr&aacute;ctica cotidiana ofrece la oportunidad de poder predecir toxicidad o eficacia terap&eacute;utica.</font></p>              <p align="justify"><font face="verdana" size="2"><b>Palabras clave:&nbsp;</b>Farmacogen&oacute;mica; Polimorfismo; Clopidogrel; Warfarina; Estatinas; Argentina.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>              <p align="justify"><font face="verdana" size="2">Cardiovascular disease remains a major cause of morbidity and mortality worldwide. Current medical practice takes into account information based on population studies and benefits observed in large populations or cohorts. However, individual patients present great differences in both toxicity and clinical efficacy that can be explained by variations in adherence, unknown drug to drug interactions and genetic variability. The latter seems to explain from 20% up to 95% of patient to patient variability. Treating patients with cardiovascular disorders faces the clinician with the challenge to include genomic analysis into daily practice. There&nbsp;are several examples within cardiovascular disease of treatments that can vary in toxicity or clinical usefulness based on genetic changes. One of the main factors affecting the efficacy of Clopidogrel is the phenotype associated with polymorphisms in the gene <i>CYP 2C9.</i> Furthermore, regarding oral anticoagulants, changes in CYP2C9 and <i>VKORC1</i> play an important role in changing the clinical response to anticoagulation. When analyzing statin treatment, one of their main toxicities (myopathy) can be predicted by the <i>SLCO1B1</i> polymorphism. The potential for prediction of toxicity and clinical efficacy from the use of genetic analysis warrants further studies aiming towards its inclusion in daily clinical practice.</font></p>              <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Pharmacogenomic; Polymorphism; Clopidogrel; Warfarin; Statin; Argentina.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>              <p align="justify"><font face="verdana" size="2">Muchos de los progresos terap&eacute;uticos de la medicina moderna se sustentan en un mayor conocimiento acerca de la biolog&iacute;a de las enfermedades y sus mecanismos fisiopatog&eacute;nicos. Paralelamente, resulta evidente que la mayor&iacute;a de los f&aacute;rmacos en sus dosificaciones convencionales no producen efectos uniformes en todos los pacientes que los reciben<sup>1</sup>. Los f&aacute;rmacos prescritos para las indicaciones m&aacute;s frecuentes en la pr&aacute;ctica habitual no producen el efecto terap&eacute;utico deseado en el 30 al 60% de los enfermos<sup>2</sup>.</font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Mientras los grandes ensayos aleatorizados eval&uacute;an el beneficio de distintas estrategias a nivel grupal, los pacientes presentan variaciones interindividuales tanto en la eficacia como en la toxicidad. Dichas variaciones se pueden explicar principalmente por diferencias en la adherencia, interacciones no reconocidas y por diferencias gen&eacute;ticas. Varios f&aacute;rmacos &uacute;tiles en el tratamiento cardiovascular presentan l&iacute;mites terap&eacute;uticos estrechos y diferencias en la efectividad debido a variaciones gen&eacute;ticas. Se considera que las variaciones en el genoma explicar&iacute;an entre un 20 y un 95% de la diferencia interindividual tanto en la disponibilidad como en la respuesta a f&aacute;rmacos<sup>3</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">La farmacogen&oacute;mica es el estudio de la influencia de las variaciones gen&eacute;ticas heredadas o adquiridas en la respuesta a f&aacute;rmacos<sup>4</sup>. Los efectos farmacol&oacute;gicos de la mayor&iacute;a de los medicamentos habitualmente prescritos son la resultante de una serie de procesos farmacocin&eacute;ticos (que determinar&aacute;n la cantidad de medicamento que llega a la biofase) y farmacodin&aacute;micos vinculados a la efectividad de la interacci&oacute;n del f&aacute;rmaco con su receptor. La variabilidad de expresi&oacute;n y funci&oacute;n de las distintas enzimas involucradas en estos procesos constituye el n&uacute;cleo principal de estudio de la farmacogen&oacute;mica. Es claro que este an&aacute;lisis no explica la totalidad de la variabilidad de la respuesta terap&eacute;utica, sino que se enmarca dentro de las diferencias determinadas por g&eacute;nero, edad, alimentaci&oacute;n, comorbilidades, factores ambientales e interacciones de medicamentos. Asimismo, la farmacogen&oacute;mica puede facilitar la identificaci&oacute;n de biomarcadores &uacute;tiles para la selecci&oacute;n del f&aacute;rmaco adecuado, la dosis apropiada, el tiempo de tratamiento &oacute;ptimo o para la prevenci&oacute;n de la aparici&oacute;n de efectos adversos<sup>2</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">Existen distintos tipos de variantes gen&eacute;ticas posibles (deleciones, inserciones o multiplicaciones), que pueden involucrar porciones relativamente extensas del &aacute;cido desoxirribonucleico (ADN) celular, aunque las m&aacute;s frecuentes y blanco habitual de los an&aacute;lisis farmacogen&eacute;ticos son los polimorfismos de nucle&oacute;tido &uacute;nico (single nucleotide polymorphism o SNP seg&uacute;n sus siglas en ingl&eacute;s). La secuenciaci&oacute;n del genoma humano ha permitido establecer que hay m&aacute;s de 10 millones de SNP, sitios espec&iacute;ficos en los que existe un cambio de la secuencia de nucle&oacute;tidos. Entre ellos solo una minor&iacute;a parece tener alg&uacute;n tipo de impacto en la cin&eacute;tica o la din&aacute;mica de los f&aacute;rmacos. Por eso, las etapas del estudio farmacogen&oacute;mico pueden ir desde el aspecto puramente gen&eacute;tico hacia la identificaci&oacute;n de los SNP con impacto cl&iacute;nico o bien, en sentido inverso, estableciendo las secuencias espec&iacute;ficas de nucle&oacute;tidos, a partir de la identificaci&oacute;n de individuos con comportamientos particulares en relaci&oacute;n con el metabolismo de f&aacute;rmacos<sup>5,6</sup>. Los genes que codifican las prote&iacute;nas metabolizadoras, transportadores o receptores, pueden presentar distintas variantes al&eacute;licas, algunas de las cuales demuestran un impacto diverso sobre la magnitud de la expresi&oacute;n de sus productos<sup>7</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">En la &uacute;ltima d&eacute;cada, el conocimiento de la farmacogen&oacute;mica relativa a los f&aacute;rmacos cardiovasculares se ha incrementado significativamente. A continuaci&oacute;n, describimos las principales aplicaciones de la farmacogen&oacute;mica en enfermedades cardiovasculares, en lo referente a f&aacute;rmacos con acciones muy diversas (<a href="/img/revistas/acm/v84n1/a5t1.jpg" target="_blank">tabla 1</a>). Existen procedimientos avanzados como la gu&iacute;a farmacogen&oacute;mica del tratamiento anticoagulante con agentes dicumar&iacute;nicos, mientras otros buscan definir su lugar en la terap&eacute;utica como la farmacogen&oacute;mica del clopidogrel y las estatinas. Finalmente, en un estadio m&aacute;s incipiente, se encuentran los betabloqueantes, otros antihipertensivos y algunos agentes antiplaquetarios.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>Clopidogrel</b></font></p>              <p align="justify"><font face="verdana" size="2">El clopidogrel inhibe la activaci&oacute;n plaquetaria inducida por la adenosina difosfato mediante la uni&oacute;n irreversible al P2Y12, receptor plaquetario de la adenosina difosfato. De este modo impide la agregaci&oacute;n plaquetaria<sup>8</sup>. Existe una gran variabilidad interindividual en la respuesta al clopidogrel entre pacientes que reciben el f&aacute;rmaco luego de una intervenci&oacute;n coronaria percut&aacute;nea. El clopidogrel es un prof&aacute;rmaco, que requiere activaci&oacute;n metab&oacute;lica en pasos secuenciales, con la isoenzima CYP2C19 como paso limitante. Su gen codificante es altamente polim&oacute;rfico, con un SNP asociado a la aparici&oacute;n de una prote&iacute;na con muy escasa actividad enzim&aacute;tica<sup>9</sup>. La biodisponibilidad del clopidogrel est&aacute; limitada por la actividad de la glucoprote&iacute;na P intestinal, codificada por el gen <i>ABCB1,</i> y solamente un 15% de la dosis original es oxidada a su metabolito activo<sup>10</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">La presencia de alelos variantes en el gen que codifica a la isoenzima CYP2C19 est&aacute; asociada a una escasa actividad enzim&aacute;tica; en particular el alelo *2, y en menor medida el *3, *4 y *5, se asocian a una disminuci&oacute;n de la respuesta plaquetaria al clopidogrel<sup>11&#45;13</sup>. Si bien persisten ciertas controversias respecto a la metodolog&iacute;a m&aacute;s apropiada para evaluar la respuesta plaquetaria al uso de clopidogrel, este fen&oacute;meno se ha asociado con una mayor actividad plaquetaria residual y una menor respuesta terap&eacute;utica en pacientes con enfermedad cardiovascular, luego de recibir este f&aacute;rmaco en dosis de carga<sup>10,14&#45;17</sup>. Por otro lado, la presencia del alelo *17 se asocia a un incremento de la actividad transcripcional, y por consiguiente, a una mayor susceptibilidad a la acci&oacute;n del clopidogrel con incremento del riesgo de sangrado<sup>18</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">La variabilidad gen&eacute;tica que determina la respuesta al clopidogrel no se limita solamente a los polimorfismos de CYP2C19. La influencia de otros polimorfismos, tales como los del gen <i>ABCB1</i> o los del receptor P2Y12, no ha sido informada de manera consistente en distintas publicaciones<sup>15,19&#45;21</sup>. En 2010 la Food and Drug Administration incluy&oacute; una advertencia en el prospecto del producto. Este se&ntilde;ala que las personas con una variante disfuncional en el gen codificante de CYP2C19 pueden requerir ajustes de la dosis de clopidogrel o el uso de un f&aacute;rmaco alternativo<sup>22</sup>. Se ha establecido la utilidad de la genotipificaci&oacute;n de CYP2C19 para pacientes con riesgo moderado o alto de eventos cardiovasculares, que sean tratados con clopidogrel<sup>23,24</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">La evidencia de la asociaci&oacute;n con eventos cl&iacute;nicos permanece a&uacute;n controvertida. En 2 ensayos cl&iacute;nicos de gran magnitud, no pudo ser demostrada la asociaci&oacute;n de los polimorfismos del gen <i>CYP2C19</i> con el riesgo de eventos cardiovasculares en pacientes con episodios coronarios agudos o fibrilaci&oacute;n auricular. Lo mismo aconteci&oacute; en una revisi&oacute;n sistem&aacute;tica que inclu&iacute;a a pacientes con distintas indicaciones para recibir clopidogrel<sup>24&#45;26</sup>. Un estudio cl&iacute;nico realizado recientemente en Jap&oacute;n sobre 160 pacientes, con intervenci&oacute;n coronaria percut&aacute;nea, demostr&oacute; que el riesgo de eventos adversos card&iacute;acos importantes y de necesidad de revascularizaci&oacute;n posterior fue significativamente mayor entre pacientes con fenotipo de metabolizadores escasos e intermedios para CYP1C19 respecto a los metabolizadores grandes<sup>27</sup>. Por otro lado, el an&aacute;lisis farmacogen&oacute;mico del estudio Pharmacogenomics of Antiplatelet Intervention (PAPI) realizado sobre 429 personas de descendencia Amish, demostr&oacute; que la presencia de la variante *2 en el gen <i>CYP2C19</i> estaba asociada con una disminuci&oacute;n de la respuesta de agregaci&oacute;n plaquetaria al clopidogrel y con un riesgo aumentado <i>(hazard ratio</i> 2.42; IC95%: 1.18&#45;4.99), de padecer un evento cardiovascular isqu&eacute;mico o fallecer dentro del a&ntilde;o del seguimiento<sup>28</sup>. Finalmente, en un metaan&aacute;lisis m&aacute;s reciente basado en 9 estudios farmacogen&oacute;micos en 9,685 pacientes con eventos coronarios agudos o que fueron sometidos a intervenci&oacute;n coronaria percut&aacute;nea, la presencia de alelos variantes asociados con expresi&oacute;n proteica defectuosa, tanto en homo como en heterocigosis, estaba ligada a un mayor riesgo de muerte por causa cardiovascular, infarto agudo de miocardio o accidente cerebrovascular<sup>29</sup>.</font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Estos hallazgos muestran que el an&aacute;lisis farmacogen&oacute;mico para el clopidogrel podr&iacute;a ser de utilidad en pacientes seleccionados, como los que son sometidos a intervenciones coronarias percut&aacute;neas y presentan mayor riesgo de trombosis<sup>30</sup>. En estos escenarios, un aspecto crucial para la demostraci&oacute;n de la utilidad del estudio farmacogen&oacute;mico es el tiempo de respuesta. La disponibilidad de un an&aacute;lisis en la &lt;&lt;cabecera&gt;&gt; del paciente con resultado r&aacute;pido o inmediato mejorar&iacute;a significativamente la perspectiva con relaci&oacute;n a la individualizaci&oacute;n terap&eacute;utica. Esto ha sido confirmado recientemente<sup>31</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>Otros antiagregantes plaquetarios</b></font></p>              <p align="justify"><font face="verdana" size="2">Los antiplaquetarios representan parte del est&aacute;ndar de cuidado en el tratamiento del s&iacute;ndrome coronario agudo y en la prevenci&oacute;n primaria y secundaria de eventos cardiovasculares. Existen marcadas variaciones individuales en la acci&oacute;n antiplaquetaria de tales f&aacute;rmacos y los an&aacute;lisis cuantitativos han demostrado una distribuci&oacute;n pr&aacute;cticamente normal. A d&iacute;a de hoy, hay abundante evidencia demostrativa de una base gen&eacute;tica tanto para la variabilidad en la acci&oacute;n plaquetaria como en la respuesta al tratamiento antiplaquetario. En primer lugar, existen varios polimorfismos asociados a variaciones en la funci&oacute;n plaquetaria basal. Diferencias en las glucoprote&iacute;nas Ia&#45;na, Ib&#45;IX y VI han sido relacionadas con cambios en la adhesi&oacute;n plaquetaria. M&aacute;s a&uacute;n, variantes en el receptor P2Y, PAR 1 y el receptor de tromboxano A2 modifican la capacidad de las plaquetas de activarse y agregarse<sup>32,33</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">La aspirina inhibe irreversiblemente la ciclooxigenasa 1 plaquetaria, enzima que cataliza la transformaci&oacute;n de &aacute;cido araquid&oacute;nico en prostaglandina 2, convertida a tromboxano A2. Numerosos receptores plaquetarios y sus polimorfismos gen&eacute;ticos se han postulado como modificadores potenciales del efecto antiplaquetario de la aspirina; sin embargo, su impacto cl&iacute;nico no est&aacute; bien determinado. Polimorfismos en la ciclooxigenasa 1, en el receptor P2Y1 y en la glucoprote&iacute;na la&#45;iia han sido descritos pero sin impacto cl&iacute;nico evidente<sup>34</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">En un reciente metaan&aacute;lisis, el &uacute;nico asociado a resistencia al tratamiento con aspirina fue un polimorfismo frecuente de la glucoprote&iacute;na &iexcl;na (OR: 2.49), sin un claro impacto en eventos cl&iacute;nicos relevantes.</font></p>              <p align="justify"><font face="verdana" size="2">Con respecto a los inhibidores de la glucoprote&iacute;na IIb&#45;IIIa, existe evidencia de una alta tasa de variabilidad interindividual en la inhibici&oacute;n de la agregaci&oacute;n plaquetaria. Una variante polim&oacute;rfica de IIIa (HPA1&#45;b) se asocia a menor efecto antiagregante del abciximab, sin un claro efecto cl&iacute;nico a pesar de estar asociado en algunas cohortes con menor riesgo de sangrado y mayor incidencia de recurrencia de eventos tromb&oacute;ticos<sup>35,36</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>Anticoagulantes orales dicumar&iacute;nicos</b></font></p>              <p align="justify"><font face="verdana" size="2">Los anticoagulantes orales dicumar&iacute;nicos (acenocumarol y warfarina) son f&aacute;rmacos muy utilizados para la prevenci&oacute;n y el tratamiento de accidentes cerebrovasculares cardioemb&oacute;licos, trombosis venosa y como parte del manejo terap&eacute;utico de la fibrilaci&oacute;n auricular. Los dicumar&iacute;nicos son f&aacute;rmacos de muy estrecho intervalo terap&eacute;utico. El 33% de las hospitalizaciones en EE. UU., secundarias a efectos adversos relacionados con f&aacute;rmacos, fueron debidas a estos anticoagulantes orales<sup>37</sup>. Tal riesgo es mayor durante las primeras 4a 8 semanas de iniciada la anticoagulaci&oacute;n<sup>38</sup>. Por eso resulta cr&iacute;tico lograr una dosis segura y efectiva desde el inicio de la anticoagulaci&oacute;n. Una particularidad de estos agentes es la gran variabilidad interindividual en la respuesta, la cual puede explicarse en parte por la edad, las interacciones de medicamentos, infecciones, disponibilidad de vitamina K en la dieta, funci&oacute;n card&iacute;aca, alteraci&oacute;n en la funci&oacute;n hep&aacute;tica y tambi&eacute;n por la presencia de polimorfismos gen&eacute;ticos<sup>39,40</sup>.</font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los genes <i>CYP 2C9</i> y <i>VKORC1</i> parecen ser los &uacute;nicos con efectos relevantes en la respuesta a los anticoagulantes dicumar&iacute;nicos<sup>40</sup>. La acenocumarina comercialmente disponible es una mezcla rac&eacute;mica, en la cual el R&#45;enanti&oacute;mero es el m&aacute;s importante desde el punto de vista farmacol&oacute;gico, debido a que su vida media es de 8 h, mientras que la del S&#45;enanti&oacute;mero es de 2 h. Ambos enanti&oacute;meros son metabolzadosa 6 y 7 hidroxiderivados primariamente a trav&eacute;s de la isoenzima CYP2C9 del complejo CYP450, y secundariamente a trav&eacute;s de CYP1A2 y CYP2C19. Si bien la gran mayor&iacute;a de los estudios farmacogen&oacute;micos publicados han evaluado la warfarina, dada la similitud de sus caracter&iacute;sticas farmacol&oacute;gicas, se estima que la variabilidad gen&eacute;tica del <i>CYP2C9</i> determina el 14% de la variabilidad interindividual de la respuesta de los pacientes a la acenocumarina<sup>41</sup> . La isoenzima CYP2C9 es codificada por el gen <i>CYP2C9,</i> el cual presenta variabilidad gen&eacute;tica. In vivo, 2 SNP de <i>CYP2C9</i> (alelos *2 y *3) se han asociado con menor expresi&oacute;n de la isoenzima y con aumento de la respuesta a los anticoagulantes orales (23 veces mayor riesgo de sangrado durante la inducci&oacute;n).</font></p>              <p align="justify"><font face="verdana" size="2">Tanto la warfarina como la acenocumarina act&uacute;an inhibiendo la enzima vitamina K ep&oacute;xido reductasa (denominada VKORC1 por vitamina K ep&oacute;xido reductasa c&oacute;mplex, la cual es codificada por el gen <i>VKORC1)</i> que regenera la vitamina K reducida, la cual a su vez act&uacute;a como cofactor de la gamma&#45;carboxilasa, enzima que activa los factores de la coagulaci&oacute;n y otras prote&iacute;nas K dependientes (II, VIIi, IX y X, prote&iacute;na C, S y Z) mediante la carboxilaci&oacute;n postranscripcional de sus residuos de &aacute;cido glut&aacute;mico.</font></p>              <p align="justify"><font face="verdana" size="2">VKORC1 es el blanco de acci&oacute;n de los anticoagulantes dicumar&iacute;nicos, y su gen codificante <i>VKORC1</i> presenta distintas variantes polim&oacute;rficas en desequilibrio de ligamento. Las variantes con importancia funcional dentro del promotor y de la regi&oacute;n intr&oacute;nica del gen son 1639G&#094;A o 3673, 497 T&#094;G o 5808, 1173 C&#094;T o 6484, 1542 G&#094;C o 6853, 2255 C&#094;T o 7566. Dada su herencia combinada, la identificaci&oacute;n de cualquiera de estos polimorfismos permite la caracterizaci&oacute;n del paciente como haplotipo A que presenta mayor sensibilidad a la acci&oacute;n de dichos f&aacute;rmacos<sup>42</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">Dado que el mayor riesgo de efectos adversos (especialmente hemorragias) se establece dentro de las primeras 8 semanas de iniciado el tratamiento anticoagulante, y que, con el manejo actual, solamente del 45 al 64% de los pacientes logra un <i>international normalized ratio</i> (INR) terap&eacute;utico dentro de ese per&iacute;odo, el conocimiento farmacogen&oacute;mico podr&iacute;a permitir la selecci&oacute;n de una dosis personalizada de acenocumarina para el inicio del tratamiento anticoagulante<sup>41</sup> <sup>&#45;43</sup><i>.</i> Si bien los anticoagulantes orales que se utilizan en la actualidad podr&iacute;an ser reemplazados en el futuro cercano por otros medicamentos m&aacute;s modernos como los inhibidores directos de la trombina y los inhibidores del factor x, los dicumar&iacute;nicos siguen siendo los f&aacute;rmacos de elecci&oacute;n para la anticoagulaci&oacute;n, al menos por su conveniente costo&#45;efectividad, as&iacute; como la existencia de ant&iacute;doto ante una eventual toxicidad y su eficacia hist&oacute;ricamente comprobada<sup>40,41</sup>. El an&aacute;lisis farmacogen&oacute;mico para warfarina ha demostrado ser de utilidad no solamente en el logro m&aacute;s r&aacute;pido y persistente de niveles de INR<sup>42</sup>, sino tambi&eacute;n en la prevenci&oacute;n de eventos cl&iacute;nicos (hospitalizaci&oacute;n por cualquier causa, por trombosis o hemorragia)<sup>44</sup>"<sup>46</sup>. A partir de estos resultados en EE. UU., la Food and Drug Administration ha reconocido el valor de la realizaci&oacute;n de las pruebas farmacogen&oacute;micas previamente a la utilizaci&oacute;n de f&aacute;rmacos anticoagulantes orales. La evidencia actual internacional demuestra que la individualizaci&oacute;n de la dosis de warfarina, guiada por estudio farmacogen&oacute;mico, determina no solamente un beneficio en los valores de INR, sino tambi&eacute;n una reducci&oacute;n del riesgo de eventos cl&iacute;nicos adversos (rehospitalizaci&oacute;n y mortalidad por hemorragia o trombosis)<sup>44</sup>. Si bien se conoce que la acenocumarina comparte tanto la v&iacute;a metab&oacute;lica como el blanco de acci&oacute;n farmacol&oacute;gica con la warfarina, no se han realizado hasta el momento estudios cl&iacute;nicos que permitan analizar la asociaci&oacute;n entre los polimorfismos de CYP2C9 y VKORC1 con los niveles de INR en pacientes tratados con este f&aacute;rmaco.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>Antihipertensivos</b></font></p>              <p align="justify"><font face="verdana" size="2">Los inhibidores de la enzima convertidora de angiotensina (ECA) constituyen un grupo farmacol&oacute;gico de primera l&iacute;nea en el tratamiento actual de la hipertensi&oacute;n arterial. Un polimorfismo de inserci&oacute;n&#45;deleci&oacute;n (rs4646994) se asocia significativamente con la concentraci&oacute;n plasm&aacute;tica de la ECA, aunque la utilidad de esta determinaci&oacute;n no ha sido confirmada en ensayos cl&iacute;nicos<sup>47,48</sup>. Por otra parte, la mutaci&oacute;n M235T del gen <i>AGT,</i> que codifica el angiotensin&oacute;geno, se ha asociado con el riesgo de accidentes cerebrovasculares y de infarto agudo de miocardio en pacientes que reciben inhibidores de la ECA, y su relevancia deber&aacute; ser confirmada en estudios posteriores<sup>49,50</sup>. Una combinaci&oacute;n de 3 polimorfismos (2 en el gen del receptor tipo i de angiotensina ii y uno en el gen <i>BKI</i> del receptor tipo i de bradicinina) permiti&oacute; predecir adecuadamente la respuesta y el riesgo de toxicidad en el uso de perindopril<sup>51</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">Para el caso de los betabloqueantes, el polimorfismo Ser49Gly del receptor &#946;&#45;1 se asoci&oacute; con incremento del proceso de &lt;&lt;downregulation&gt;&gt; del receptor y permiti&oacute; identificar a pacientes con miocardiopat&iacute;a dilatada con mayor riesgo de mortalidad a 5a&ntilde;os de tratamiento con bajas dosis<sup>52,53</sup>. El polimorfismo Arg389Gly del mismo receptor presente en homocigosis se asoci&oacute; significativamente con una mejor&iacute;a de la fracci&oacute;n de eyecci&oacute;n, una reducci&oacute;n del riesgo de hospitalizaci&oacute;n y de mortalidad, en pacientes tratados con betabloqueantes<sup>52,54</sup>. El impacto de la presencia de este polimorfismo sobre la reducci&oacute;n de la tensi&oacute;n arterial es controvertido.</font></p>              <p align="justify"><font face="verdana" size="2">Los polimorfismos y mutaciones gen&eacute;ticas fuertemente asociados con los efectos de f&aacute;rmacos antihipertensivos a&uacute;n no se han podido determinar. La mayor&iacute;a de los resultados obtenidos de estudios farmacogen&oacute;micos o farmacogen&eacute;ticos no han sido validados o no se han podido replicar en otros estudios<sup>55</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Estatinas</b></font></p>              <p align="justify"><font face="verdana" size="2">Las estatinas son inhibidores de la enzima HMG CoA reduc&#45;tasa, paso limitante de la s&iacute;ntesis del colesterol. Son &uacute;tiles para la disminuci&oacute;n del colesterol LDL y la prevenci&oacute;n primaria y secundaria de eventos cardiovasculares.</font></p>              <p align="justify"><font face="verdana" size="2">Diferentes polimorfismos en la HMG CoA reductasa y en el receptor de LDL han sido asociados con menores descensos en los niveles de LDL pero sin impacto cl&iacute;nico al menos evidente. El escenario m&aacute;s promisorio con respecto a las estatinas es la predicci&oacute;n de aparici&oacute;n de miopat&iacute;a basada en la presencia de un polimorfismo del gen que codifica al OATP1B1, el polip&eacute;ptido transportador de aniones org&aacute;nicos a trav&eacute;s de la membrana hepatocitaria, responsable del ingreso de las estatinas en el hepatocito. Representa asimismo uno de los sitios de interacci&oacute;n entre las estatinas y los fibratos. El polimorfismo del gen <i>SLCO1B1</i> (cromosoma 12) del transportador ha demostrado una asociaci&oacute;n con la aparici&oacute;n de miopat&iacute;a en subestudios de los ensayos SEARCH y HPS. En los pacientes aleatorizados con 80mg de simvastatina, la presencia de dicho polimorfismo se asoci&oacute; a miopat&iacute;a con un OR de 27<sup>56</sup>. Este escenario plantea la interesante opci&oacute;n de buscar dicho polimorfismo en los pacientes y ajustar posteriormente la dosis o el f&aacute;rmaco para disminuir la aparici&oacute;n de toxicidad. De todas formas, a pesar del aumento de riesgo, no hay que perder de vista la infrecuencia de miopat&iacute;a (&lt; 1%) en los estudios cl&iacute;nicos en el momento de evaluar el impacto potencial en la pr&aacute;ctica cl&iacute;nica.</font></p>              <p align="justify"><font face="verdana" size="2">En adici&oacute;n, el haplotipo H7 de la HmG CoA reductasa se ha asociado a menor respuesta al tratamiento con pravas&#45;tatina y simvastatina, hallazgo que no se ha repetido para otras estatinas de uso com&uacute;n. Finalmente, la variabilidad en el control del colesterol ha sido asociada d&eacute;bilmente con variantes en la ApoE pero sin confirmaciones posteriores<sup>57,58</sup>.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>Comentarios finales</b></font></p>              <p align="justify"><font face="verdana" size="2">La mayor&iacute;a de los desarrollos farmacogen&oacute;micos en terap&eacute;utica cardiovascular se encuentran actualmente en una fase de validaci&oacute;n y demostraci&oacute;n de su utilidad cl&iacute;nica potencial.</font></p>              <p align="justify"><font face="verdana" size="2">Las dificultades, comunes a los estudios gen&oacute;micos para diversas &aacute;reas terap&eacute;uticas, incluyen problemas en el disen&ntilde;o original de los estudios, la inclusi&oacute;n de la farmacogen&oacute;mica como objetivo secundario con el riesgo consiguiente de tama&ntilde;os muestrales insuficientes, limitaci&oacute;n en la repetici&oacute;n de resultados y la heterogeneidad fenot&iacute;pica subyacente en la poblaci&oacute;n<sup>59</sup>. Los avances significativos en este camino ir&aacute;n de la mano de la utilizaci&oacute;n de t&eacute;cnicas de secuenciaci&oacute;n de nueva generaci&oacute;n con tiempos de respuesta m&aacute;s r&aacute;pidos, mayor claridad y focalizaci&oacute;n en las definiciones fenot&iacute;picas y las colaboraciones multic&eacute;ntricas.</font></p>              <p align="justify"><font face="verdana" size="2">Se ha mostrado que la importancia relativa del an&aacute;lisis farmacogen&eacute;tico en la explicaci&oacute;n de la variabilidad de respuesta a f&aacute;rmacos cardiovasculares no es suficiente como para justificar su incorporaci&oacute;n en la pr&aacute;ctica cotidiana<sup>60</sup>. Sin embargo, es importante recordar que para la gran mayor&iacute;a de los f&aacute;rmacos ninguna variaci&oacute;n individual es decisiva en cuanto a la predicci&oacute;n de respuesta, y esto es l&oacute;gico desde un punto de vista evolutivo. Tal como ha sucedido en el caso de los anticoagulantes dicumar&iacute;nicos, el an&aacute;lisis de las variaciones gen&eacute;ticas, en conjunto con aspectos cl&iacute;nicos individuales (tales como el peso, superficie corporal, edad, comorbilidades), incrementar&aacute; la precisi&oacute;n de nuestras estimaciones.</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Conflicto de intereses</b></font></p>              <p align="justify"><font face="verdana" size="2">Los autores declaran no tener ning&uacute;n conflicto de intereses</font></p>              <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>              <p align="justify"><font face="verdana" size="2"><b>Bibliograf&iacute;a</b></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">1. Crew K, Hicks J, Pui C&#45;H, et al. Pharmacogenomics and individualized medicine: Translating science into practice. Clin Pharm Ther. 2012;92:467&#45;75.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125260&pid=S1405-9940201400010000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">2. Wang L, HLM, Weinshilboum R. Genomics and drug response. N Engl J Med. 2011;364:1144&#45;53.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125262&pid=S1405-9940201400010000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">3. Kalow W, Tang B, Endrenyi L. Hypothesis: Comparisons of inter&#45;and intra&#45;individual variations can substitute for twin studies in drug research. Pharmacogenetics. 1998;8:283&#45;9.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125264&pid=S1405-9940201400010000500003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              ]]></body>
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<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">9. De Morais S, Wilkinson G, Blaisdell J, et al. The major genetic defect responsible for the polymorphism of S&#45;mephenytoin metabolism in humans. J Biol Chem. 1994;269:15419&#45;22.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125276&pid=S1405-9940201400010000500009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">10. Mega J, Close S, Wiviott S, et al. Cytochrome p&#45;450 polymorphisms and response to clopidogrel. N Engl J Med. 2009;360:354&#45;62.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125278&pid=S1405-9940201400010000500010&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">11. Ford N. Clopidogrel resistance: Pharmacokinetic or pharmaco&#45;genetic. J Clin Pharmacol. 2009;49:506&#45;12.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125280&pid=S1405-9940201400010000500011&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">12. Sugunaraj J, Palaniswamy C, Selvaraj D, et al. Clopidogrel resistance. Am J Ther. 2010;17:210&#45;5.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125282&pid=S1405-9940201400010000500012&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">13. Hulot J, Bura A, Villard E, et al. Cytochrome P450 2C19 loss&#45;of&#45;function polymorphism is a major determinant of clopidogrel responsiveness in healthy subjects. Blood. 2006;108:2244&#45;7.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125284&pid=S1405-9940201400010000500013&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">14. Godino C, Mendolicchio L, Figini F, et al. Comparison of Verify Now&#45;P2Y12 test and flow cytometry for monitoring individual platelet response to clopidogrel. What is the cut&#45;off value for identifying patients who are low responders to clopidogrel therapy? Thromb J. 2009;7. <a href="http://dx.doi.org/10.1186/1477-9560-7-4" target="_blank">http://dx.doi.org/10.1186/1477&#45;9560&#45;7&#45;4</a>.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125286&pid=S1405-9940201400010000500014&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">15. Harmsze A, van Werkum J, Bouman H,et al. Besides CYP2C19*2, the variant allele CYP2C9*3 is associated with higher on&#45;clopidogrel platelet reactivity in patients on dual antiplatelet therapy undergoing elective coronary stent implantation. Pharmacogenet Genom. 2010;20:18&#45;25.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125288&pid=S1405-9940201400010000500015&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">16. Gorog D, Fuster V. Platelet function tests in clinical cardiology. J Am Coll Cardiol. 2013;61:2116&#45;29.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125290&pid=S1405-9940201400010000500016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">17. Brandt J, Close S, Iturria S, et al. Common polymorphisms of CYP2C19 and CYP2C9 affect the pharmacokinetic and pharma&#45;codynamic response to clopidogrel but not prasugrel. J Thromb Haemost. 2007;5:2429&#45;36.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125292&pid=S1405-9940201400010000500017&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">18. Sibbing D, Gebhard D, Koch W, et al. Isolated and interactive impact of common CYP2C19 genetic variants on the antiplate&#45;let effect of chronic clopidogrel therapy. J Thromb Haemost. 2010;8:1685&#45;93.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125294&pid=S1405-9940201400010000500018&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">19. Ziegler S, Schillinger M, Funk M, et al. Association of a functional polymorphism in the clopidogrel target receptor gene, P2Y12, and the risk for ischemic cerebrovascular events in patients with peripheral artery disease. Stroke. 2005;36:1394&#45;9.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125296&pid=S1405-9940201400010000500019&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">20. Staritz P, Kurz K, Stoll M, et al. Platelet reactivity and clopidogrel resistance are associated with the H2 haplotype of the P2Y12&#45;ADP receptor gene. Int J Cardiol. 2009;133:341&#45;5.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1125298&pid=S1405-9940201400010000500020&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>              <!-- ref --><p align="justify"><font face="verdana" size="2">21. Giusti B, Gori A, Marcucci R, et al. Cytochrome P450 2C19 loss&#45;of&#45;function polymorphism, but not CYP3A4 IVS10 + 12G/A and P2Y12 T744C polymorphisms, is associated with response variability to dual antiplatelet treatment in high risk vascular patients. 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