<?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>0004-0614</journal-id>
<journal-title><![CDATA[Archivos Españoles de Urología (Ed. impresa)]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Esp. Urol.]]></abbrev-journal-title>
<issn>0004-0614</issn>
<publisher>
<publisher-name><![CDATA[INIESTARES, S.A.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0004-06142010000900005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Inhibidores de la tirosin-quinasa en el tratamiento del cáncer de vejiga músculo-infiltrante y el cáncer de próstata hormono-refractario]]></article-title>
<article-title xml:lang="en"><![CDATA[Tirosin kinase inhibitor in the treatment of muscle-invasive bladder cancer and hormone refractory prostate cancer]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wallerand]]></surname>
<given-names><![CDATA[Hervé]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Robert]]></surname>
<given-names><![CDATA[Grégoire]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bernhard]]></surname>
<given-names><![CDATA[Jean-Christophe]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ravaud]]></surname>
<given-names><![CDATA[Alain]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Patard]]></surname>
<given-names><![CDATA[Jean-Jacques]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Bordeaux University Hospital Servicio de Urología ]]></institution>
<addr-line><![CDATA[Bordeaux ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Bordeaux 2 Victor Segalen University  ]]></institution>
<addr-line><![CDATA[Bordeaux ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Bordeaux University Hospital Servicio de Oncología Médica ]]></institution>
<addr-line><![CDATA[Bordeaux ]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,Rennes University Hospital Servicio de Urología ]]></institution>
<addr-line><![CDATA[Rennes ]]></addr-line>
<country>France</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>11</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>11</month>
<year>2010</year>
</pub-date>
<volume>63</volume>
<numero>9</numero>
<fpage>773</fpage>
<lpage>787</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0004-06142010000900005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0004-06142010000900005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0004-06142010000900005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Objetivo: Se sabe que varias proteín-quinasas son activadas en las células tumorales e impulsan el crecimiento y progresión tumoral. En el carcinoma de células renales metastásico, los inhibidores de la tirosin-quinasa (TKIs) han logrado importantes beneficios en progresión libre de enfermedad y supervivencia global. Los TKIs pueden ser también considerados como una prometedora opción de tratamiento en tumores vesicales y prostáticos. Nuestro objetivo fue dar a conocer los artículos más relevantes publicados para confirmar el interés de la utilización de los TKI en el tratamiento de estos tumores. Métodos: Se realizó una busqueda sistemática en PubMed y se revisaron los artículos recuperados. Las palabras clave utilizadas fueron: inhibidor de la tirosin-quinasa, inhibidor de la protein-quinasa, cáncer de próstata hormono-refractario, cáncer de vejiga músculo-infiltrante. Las publicaciones más relevantes de ciencia básica y ensayos clínicos controlados y aleatorizados fueron resumidas y analizadas. Resultados: En cuanto al cáncer de vejiga, el tratamiento TKI es una de las estrategias terapéuticas más estudiadas en el campo de la terapia dirigida. De hecho, se ha sugerido que dirigiendo solamente TK y/o asociándola con quimioterapia citotóxica puede representar una opción prometedora para tratar el cáncer de vejiga localmente avanzado y/o metastásico. En cuanto al cáncer de próstata hormono-refractario (CPHR), los datos recogidos son aún confusos. Los estudios de ciencia básica encontraron una interesante expresión de receptores EGF y VEGF en las células tumorales confirmando la idea de que los TKI podrían resultar eficientes en el CPHR. Sin embargo la mayoría de estudios publicados de fase II encontraron un débil efecto sobre los síntomas y la calidad de vida sin ninguna disminución en los niveles de PSA o en la supervivencia general. Conclusión: Los TKIs todavía no han alcanzado en tumores vesicales o prostátivos una eficacia similar a lo que se ha obtenido en el carcinoma renal metastásico. Se necesitan más estudios para establecer el papel de ese enfoque en tumores no renales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Objectives: Various protein kinases are known to be activated in cancer cells and drive tumor growth and progression. In metastatic renal cell carcinoma tyrosine-kinase inhibitors (TKIs) have achieved significant progression-free and overall survival improvements. For bladder and prostate cancers TKIs may also be considered as a promising treatment option. Our aim was to report the most relevant published articles to support the interest of the use of TKIs in the treatment of bladder and prostate cancer. Method: PubMed database and bibliographies of retrieved articles were reviewed. The key words used were tyrosine-kinase inhibitor, protein-kinase inhibitor, hormone refractory prostate cancer, muscle invasive bladder cancer. The most relevant publications from basic science and clinical randomized controlled studies were summarized and analyzed. Results: Regarding bladder cancer, TKI treatment is one of the most studied therapeutic strategies in the field of targeted therapy. Indeed, it has been suggested that targeting TK alone and/or in association with cytotoxic chemotherapy may represent a promising option for treating locally advanced and/or metastatic bladder cancer. Concerning hormone refractory prostate cancer (HRPC), collected data are still confusing. Basic science studies found an interesting expression of EGF and VEGF receptors on cancer cells supporting the idea that TKIs could be efficient in HRPC. Nonetheless most of published clinical phase II studies found a weak effect on symptoms and quality of life without any decrease in PSA levels or overall survival. Conclusion: TKIs have not yet achieved in bladder and prostate cancers similar efficacy to what has been obtained in metastatic renal cell carcinoma. Further studies are needed to establish the place of such an approach in non renal tumors.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Inhibidor de la proteín-quinasa]]></kwd>
<kwd lng="es"><![CDATA[Inhibidor de la tirosin-quinasa]]></kwd>
<kwd lng="es"><![CDATA[Cáncer de vejiga]]></kwd>
<kwd lng="es"><![CDATA[Cáncer de vejiga músculo infilrante]]></kwd>
<kwd lng="es"><![CDATA[Cáncer de próstata]]></kwd>
<kwd lng="es"><![CDATA[Cáncer de próstata hormono refractario]]></kwd>
<kwd lng="es"><![CDATA[Terapia adyuvante]]></kwd>
<kwd lng="en"><![CDATA[Protein kinase inhibitor]]></kwd>
<kwd lng="en"><![CDATA[Tyrosine kinase inhibitor]]></kwd>
<kwd lng="en"><![CDATA[Bladder cancer]]></kwd>
<kwd lng="en"><![CDATA[Muscle invasive bladder cancer]]></kwd>
<kwd lng="en"><![CDATA[Prostate cancer]]></kwd>
<kwd lng="en"><![CDATA[Hormone refractory prostate cancer]]></kwd>
<kwd lng="en"><![CDATA[Adjuvant therapy]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p><font face="Verdana" size="2"><b><a name="top"></a>ARTICULO ESPECIAL</b></font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="4"><b>Inhibidores de la tirosin-quinasa en el tratamiento del c&aacute;ncer de vejiga m&uacute;sculo-infiltrante y el c&aacute;ncer de pr&oacute;stata hormono-refractario</b></font></p>     <p><font face="Verdana" size="4"><b>Tirosin kinase inhibitor in the treatment of muscle-invasive bladder cancer and hormone refractory prostate cancer</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Herv&eacute; Wallerand<sup>1</sup>, Gr&eacute;goire Robert<sup>1</sup>, Jean-Christophe Bernhard<sup>1</sup>, Alain Ravaud<sup>2</sup> y Jean-Jacques Patard<sup>3</sup></b></font></p>     <p><font face="Verdana" size="2"><sup>1</sup>Servicio de Urolog&iacute;a. Bordeaux University Hospital. Bordeaux 2 Victor Segalen University. Bordeaux.    <br><sup>2</sup>Servicio de Oncolog&iacute;a M&eacute;dica. Bordeaux University Hospital. Bordeaux 2 Victor Segalen University. Bordeaux.    <br><sup>3</sup>Servicio de Urolog&iacute;a. Rennes University Hospital. Rennes. France.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><a href="#back">Direcci&oacute;n para correspondencia</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1">     <p><font face="Verdana" size="2"><b>RESUMEN</b></font></p>     <p><font face="Verdana" size="2"><b>Objetivo:</b> Se sabe que varias prote&iacute;n-quinasas son activadas en las c&eacute;lulas tumorales e impulsan el crecimiento y progresi&oacute;n tumoral. En el carcinoma de c&eacute;lulas renales metast&aacute;sico, los inhibidores de la tirosin-quinasa (TKIs) han logrado importantes beneficios en progresi&oacute;n libre de enfermedad y supervivencia global. Los TKIs pueden ser tambi&eacute;n considerados como una prometedora opci&oacute;n de tratamiento en tumores vesicales y prost&aacute;ticos. Nuestro objetivo fue dar a conocer los art&iacute;culos m&aacute;s relevantes publicados para confirmar el inter&eacute;s de la utilizaci&oacute;n de los TKI en el tratamiento de estos tumores.    <br><b>M&eacute;todos:</b> Se realiz&oacute; una busqueda sistem&aacute;tica en PubMed y se revisaron los art&iacute;culos recuperados. Las palabras clave utilizadas fueron: inhibidor de la tirosin-quinasa, inhibidor de la protein-quinasa, c&aacute;ncer de pr&oacute;stata hormono-refractario, c&aacute;ncer de vejiga m&uacute;sculo-infiltrante. Las publicaciones m&aacute;s relevantes de ciencia b&aacute;sica y ensayos cl&iacute;nicos controlados y aleatorizados fueron resumidas y analizadas.    <br><b>Resultados:</b> En cuanto al c&aacute;ncer de vejiga, el tratamiento TKI es una de las estrategias terap&eacute;uticas m&aacute;s estudiadas en el campo de la terapia dirigida. De hecho, se ha sugerido que dirigiendo solamente TK y/o asoci&aacute;ndola con quimioterapia citot&oacute;xica puede representar una opci&oacute;n prometedora para tratar el c&aacute;ncer de vejiga localmente avanzado y/o metast&aacute;sico. En cuanto al c&aacute;ncer de pr&oacute;stata hormono-refractario (CPHR), los datos recogidos son a&uacute;n confusos. Los estudios de ciencia b&aacute;sica encontraron una interesante expresi&oacute;n de receptores EGF y VEGF en las c&eacute;lulas tumorales confirmando la idea de que los TKI podr&iacute;an resultar eficientes en el CPHR. Sin embargo la mayor&iacute;a de estudios publicados de fase II encontraron un d&eacute;bil efecto sobre los s&iacute;ntomas y la calidad de vida sin ninguna disminuci&oacute;n en los niveles de PSA o en la supervivencia general.    <br><b>Conclusi&oacute;n:</b> Los TKIs todav&iacute;a no han alcanzado en tumores vesicales o prost&aacute;tivos una eficacia similar a lo que se ha obtenido en el carcinoma renal metast&aacute;sico. Se necesitan m&aacute;s estudios para establecer el papel de ese enfoque en tumores no renales.</font></p>     <p><font face="Verdana" size="2"><b>Palabras clave:</b> Inhibidor de la prote&iacute;n-quinasa. Inhibidor de la tirosin-quinasa.C&aacute;ncer de vejiga. C&aacute;ncer de vejiga m&uacute;sculo infilrante. C&aacute;ncer de pr&oacute;stata. C&aacute;ncer de pr&oacute;stata hormono refractario. Terapia adyuvante.</font></p> <hr size="1">     <p><font face="Verdana" size="2"><b>SUMMARY</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><b>Objectives:</b> Various protein kinases are known to be activated in cancer cells and drive tumor growth and progression. In metastatic renal cell carcinoma tyrosine-kinase inhibitors (TKIs) have achieved significant progression-free and overall survival improvements. For bladder and prostate cancers TKIs may also be considered as a promising treatment option. Our aim was to report the most relevant published articles to support the interest of the use of TKIs in the treatment of bladder and prostate cancer.    <br><b>Method:</b> PubMed database and bibliographies of retrieved articles were reviewed. The key words used were tyrosine-kinase inhibitor, protein-kinase inhibitor, hormone refractory prostate cancer, muscle invasive bladder cancer. The most relevant publications from basic science and clinical randomized controlled studies were summarized and analyzed.    <br><b>Results:</b> Regarding bladder cancer, TKI treatment is one of the most studied therapeutic strategies in the field of targeted therapy. Indeed, it has been suggested that targeting TK alone and/or in association with cytotoxic chemotherapy may represent a promising option for treating locally advanced and/or metastatic bladder cancer. Concerning hormone refractory prostate cancer (HRPC), collected data are still confusing. Basic science studies found an interesting expression of EGF and VEGF receptors on cancer cells supporting the idea that TKIs could be efficient in HRPC. Nonetheless most of published clinical phase II studies found a weak effect on symptoms and quality of life without any decrease in PSA levels or overall survival.    <br><b>Conclusion:</b> TKIs have not yet achieved in bladder and prostate cancers similar efficacy to what has been obtained in metastatic renal cell carcinoma. Further studies are needed to establish the place of such an approach in non renal tumors.</font></p>     <p><font face="Verdana" size="2"><b>Key words:</b> Protein kinase inhibitor. Tyrosine kinase inhibitor. Bladder cancer. Muscle invasive bladder cancer. Prostate cancer. Hormone refractory prostate cancer. Adjuvant therapy.</font></p> <hr size="1">     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Introducci&oacute;n</b></font></p>     <p><font face="Verdana" size="2">Se sabe que varias prote&iacute;nas quinasas  se activan en las c&eacute;lulas tumorales y dirigen el crecimiento y progresi&oacute;n  del tumor. Por lo tanto, el bloqueo de la tirosin-quinasa (TQ) representa un  enfoque racional para el tratamiento antitumoral. Los receptores de la tirosin-quinasa  (RTKs) producen una se&ntilde;al mitog&eacute;nica a trav&eacute;s de la activaci&oacute;n  del gen Ras, que es un oncog&eacute;n frecuentemente activado por mutaciones  puntuales en diversos tumores humanos, incluyendo vejiga y pr&oacute;stata.  Los RTKs han sido identificados como proto-oncogenes y la proliferaci&oacute;n  de c&eacute;lulas tumorales se ha asociado con actividad no regulada de los  oncogenes (1). Sin embargo, los RTKs en c&eacute;lulas tumorales pueden tambi&eacute;n  activar PI-3K que conduce a la activaci&oacute;n de Akt y se&ntilde;ales anti-apopt&oacute;ticas  a la c&eacute;lula a trav&eacute;s de la fosforilaci&oacute;n de BAD. Ambas  v&iacute;as Ras-dependiente y Ras-independiente permiten que las c&eacute;lulas  tumorales proliferen selectivamente lo que sugiere que la focalizaci&oacute;n  hacia una v&iacute;a &uacute;nica no ser&iacute;a suficiente para el tratamiento  eficaz del c&aacute;ncer (<a href="#f1">Figura 1</a>). La investigaci&oacute;n  b&aacute;sica en la terapia dirigida sugiere cada vez m&aacute;s que la inhibici&oacute;n  de los diferentes objetivos representa una opci&oacute;n de tratamiento prometedora.</font></p>     <p>&nbsp;</p>     <p><a name="f1"></a></p>     ]]></body>
<body><![CDATA[<p align="center"><img src="/img/revistas/urol/v63n9/05f01.jpg"></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2">Los f&aacute;rmacos con diana molecular espec&iacute;fica se dividen en 3 grupos:</font></p>     <blockquote> 	    <p><font face="Verdana" size="2"><b>a)</b> F&aacute;rmacos que act&uacute;an sobre la superficie celular de los receptores,</font></p> 	    <p><font face="Verdana" size="2"><b>b)</b> F&aacute;rmacos que act&uacute;an sobre las v&iacute;as intracelulares, y</font></p> 	    <p><font face="Verdana" size="2"><b>c)</b> Medicamentos que act&uacute;an sobre los inhibidores del proteosoma.</font></p> </blockquote>     <p><font face="Verdana" size="2">Los inhibidores de la tirosin-quinasa (TKIs)  act&uacute;an sobre la superficie celular de los receptores que se sabe es anormalmente  activa en los tumores. Se han desarrollado y aprobado para uso cl&iacute;nico  numerosos TKIs: gefitinib, erlotinib, sunitinib, lapatinib, nilotinib y dasatinib.  Se ha demostrado que reducen la proliferaci&oacute;n celular en l&iacute;neas  celulares de tumores humanos y xenoinjertos y que tambi&eacute;n aumentan la  apoptosis, inducen la detenci&oacute;n del ciclo celular y disminuyen la angiogenesis  (2). Recientemente ha surgido la idea de que dirigi&eacute;ndose a varios TK  ser&iacute;a m&aacute;s efectivo que limit&aacute;ndose a activar un &uacute;nico  TK (3). Se ha demostrado que varios receptores de la tirosin-quinasa como el  EGFR, PDGFR, IGFR, VEGFR, FGFR, y HGFR se sobreexpresan en tumores vesicales  y/o de prost&aacute;ticos. Entre estos, el EFGR y las v&iacute;as de la angiog&eacute;nesis  son especialmente interesantes porque se dispone en la pr&aacute;ctica cl&iacute;nica  de una diana espec&iacute;fica para los f&aacute;rmacos.</font></p>     <p><font face="Verdana" size="2">En la met&aacute;stasis de carcinoma de c&eacute;lulas  renales, los inhibidores de la tirosin-quinasa (TKIs) han logrado mejorar la  progresi&oacute;n libre de enfermedad y la supervivencia global m&aacute;s que  otros tratamientos (4). En los tumores de vejiga y pr&oacute;stata, los TKIs  tambi&eacute;n pueden ser considerados como una prometedora opci&oacute;n de  tratamiento. Nuestro objetivo fue dar a conocer los art&iacute;culos m&aacute;s  relevantes publicados para apoyar el inter&eacute;s de la utilizaci&oacute;n  de los TKIs en el tratamiento de los tumores de vejiga y pr&oacute;stata.</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><b>Material y m&eacute;todos</b></font></p>     <p><font face="Verdana" size="2">Se revisaron sistem&aacute;ticamente la base  de datos PubMed y las bibliograf&iacute;as de los art&iacute;culos recuperados.  Las palabras clave utilizadas fueron: inhibidor de la tirosin-quinasa, inhibidor  de la prote&iacute;na-quinasa, c&aacute;ncer de pr&oacute;stata hormono refractario,  c&aacute;ncer de vejiga m&uacute;sculo-infiltrante. Se resumieron y discutieron  las publicaciones m&aacute;s relevantes de ciencias b&aacute;sica y ensayos  cl&iacute;nicos controlados y aleatorizados. Los estudios cl&iacute;nicos con  una metodolog&iacute;a deficiente o sin grupo de control fueron sistem&aacute;ticamente  rechazados.</font></p>     <p><font face="Verdana" size="2"><b>TKI en c&aacute;ncer de vejiga</b></font></p>     <p><font face="Verdana" size="2">El c&aacute;ncer de vejiga es la segunda neoplasia  genito urinaria m&aacute;s com&uacute;n en todo el mundo. La incidencia del  c&aacute;ncer de vejiga est&aacute; aumentando, y se esperaron casi 360.000  nuevos casos en 2008 junto con 145.000 muertes (5). El c&aacute;ncer de vejiga  representa una de los tumores humanos m&aacute;s costosos, cuando se consideran  los protocolos de vigilancia utilizados en la actualidad y el hecho de que muchos  pacientes viven durante largos per&iacute;odos de tiempo despu&eacute;s del  diagn&oacute;stico, especialmente en el c&aacute;ncer de vejiga no m&uacute;sculo-infiltrante  (6). De todos los nuevos casos diagnosticados de este tumor, el 70% son no m&uacute;sculo  infiltrante (CVNMI) (Ta, T1, y Tis), pero tanto hasta el 50-70% recurrir&aacute;n  y el 10-20% de ellos evolucionan mediante invasi&oacute;n de la membrana basal  (T2-T4). En la primera presentaci&oacute;n, casi el 20% de los tumores vesicales  son infiltrantes (c&aacute;ncer vesical m&uacute;sculo-infiltrante. CVMI). El  desaf&iacute;o en los CVNMI sigue siendo predecir mediante el uso de biomarcadores  moleculares qu&eacute; tumores recurrir&aacute;n y/o progresar&aacute;n. Algunos  de estos marcadores moleculares son tambi&eacute;n &uacute;tiles en el tratamiento,  ya que pueden ser utilizados como dianas, principalmente en el c&aacute;ncer  de vejiga localmente avanzado o metast&aacute;sico. Los avances en la investigaci&oacute;n  molecular han conducido a una mejor comprensi&oacute;n de la biolog&iacute;a  tumoral del carcinoma urotelial y a desarrollar nuevas herramientas que permiten  a los m&eacute;dicos seleccionar con m&aacute;s precisi&oacute;n el tratamiento  &oacute;ptimo para cada paciente. Las modalidades habituales de tratamiento  de c&aacute;ncer vesical (quimioterapia y radioterapia) siguen siendo decepcionantes  debido a su toxicidad reforzando nuevamente la justificaci&oacute;n para un  tratamiento espec&iacute;fico. El carcinoma urotelial est&aacute; fuertemente  asociado con mutaciones de las diversas v&iacute;as moleculares implicadas en  la proliferaci&oacute;n celular, la angiog&eacute;nesis tumoral y la apoptosis.  Entre ellas, el receptor del factor de crecimiento epitelial (RFCE) y la angiog&eacute;nesis  tumoral son dianas importantes en la terapia dirigida a estas v&iacute;as que,  recientemente, estan disponibles en cl&iacute;nica.</font></p>     <p><font face="Verdana" size="2"><b><i>Focalizaci&oacute;n del RFCE (receptor  del factor de crecimiento epitelial) en el c&aacute;ncer de vejiga</i></b></font></p>     <p><font face="Verdana" size="2">El RFCE es el transductor de se&ntilde;ales implicado  en la regulaci&oacute;n de diversos procesos neopl&aacute;sicos, tales como  la progresi&oacute;n del ciclo celular, la inhibici&oacute;n de la apoptosis,  la mobilidad de las c&eacute;lulas tumorales, invasi&oacute;n y met&aacute;stasis  (7). La activaci&oacute;n del RFCE participa en la activaci&oacute;n de la angiog&eacute;nesis  tumoral mediante la estimulaci&oacute;n de la expresi&oacute;n del factor de  crecimiento endotelial vascular (FCEV). La expresi&oacute;n aberrante del RFCE  se ha demostrado en muchos tipos de c&aacute;ncer, incluyendo el c&aacute;ncer  de vejiga y se ha asociado con la estadificaci&oacute;n, el grado y la supervivencia  global (2, 7).</font></p>     <p><font face="Verdana" size="2">Tambi&eacute;n se ha asociado con la resistencia  a la quimioterapia citot&oacute;xica com&uacute;n en varios tumores de nuestra  econonom&iacute;a, incluyendo el c&aacute;ncer de vejiga (8). En el an&aacute;lisis  multivariante, la presencia de expresi&oacute;n de RFCE en el c&aacute;ncer  vesical ha demostrado ser un predictor independiente de enfermedad invasiva,  progresi&oacute;n en la estadificaci&oacute;n y escasa supervivencia (9). La  immunopositividad del RFCE en el tumor vesical se ha evaluado en estudios, que  informaron de tasas de expresi&oacute;n del 23% a 100% (10). La desregulaci&oacute;n  del RFCE en las neoplasias puede producirse por diferentes mecanismos como la  sobreexpresi&oacute;n del receptor, mutaciones, alteraciones en el proceso de  dimerizaci&oacute;n, y activaci&oacute;n de bucles autocrinos para factor de  crecimiento. El nivel de expresi&oacute;n de prote&iacute;na RFCE no est&aacute;  por lo general considerado como un marcador biol&oacute;gico fiable de actividad  de los TKI anti-RFCE (10). Se ha demostrado que los inhibidores del RFCE tienen  efectos antiproliferativos y antiangiog&eacute;nicos en modelos precl&iacute;nicos  (11). En esta clase, el gefitinib, lapatinib, y erlotinib son actualmente aceptados  para uso cl&iacute;nico en varios tumores humanos y est&aacute;n bajo evaluaci&oacute;n  en el c&aacute;ncer de vejiga (<a target="_blank" href="/img/revistas/urol/v63n9/05t01.jpg">Tabla I</a>).</font></p>     <p><font face="Verdana" size="2">El gefitinib conduce a la detenci&oacute;n del  ciclo celular en fase G1, implicando el incremento en la expresi&oacute;n del,  inhibidor de la p27<sup>Kip1</sup> quinasa dependiente de ciclina (CDK) y en la disminuci&oacute;n  de la expresi&oacute;n de la CDK2-4-6, ciclina D1 y D3. Se observaron efectos  similares despu&eacute;s de tratamiento con erlotinib (11).</font></p>     <p><font face="Verdana" size="2">El lapatinib tiene como objetivo tanto el RFCE  como el HER2/neu en contraste con el gefitinib, que es &uacute;nicamente un  inhibidor de RFCE. El lapatinib reduce la viabilidad celular en forma dosis-dependiente  en l&iacute;neas celulares de c&aacute;ncer vesical RT112 y J82 (12). Asimismo  se identific&oacute; un efecto sin&eacute;rgico antitumoral de gefitinib y lapatinib  con agentes citot&oacute;xicos en modelos precl&iacute;nicos, y el lapatinib  y los f&aacute;rmacos citot&oacute;xicos que se utilizan actualmente en el manejo  del c&aacute;ncer de vejiga metast&aacute;sico mostraron sinergia dependiente  de programaci&oacute;n. Sin embargo, se han observado discrepancias entre la  expresi&oacute;n de RFCE y la respuesta al RFCE -TKIs en el c&aacute;ncer de  pulm&oacute;n de c&eacute;lulas no microc&iacute;tico.</font></p>     <p><font face="Verdana" size="2">Un enfoque alternativo podr&iacute;a consistir  en explorar los agentes del flujo descendente de la v&iacute;as de se&ntilde;alizaci&oacute;n  del RFCE como STAT 5A y 5B, y cateninas-&gamma; (transductores de se&ntilde;al  y activadores de transcripci&oacute;n) (13). Por otra parte, se ha demostrado  que algunos genes como el GRG1 puede conferir resistencia al RFCE-TKI. El GRG1  est&aacute; regulado al alza en tumores resistentes a gefitinib, lo que lleva  a la hip&oacute;tesis de que tomar como objetivo el GRG1 podr&iacute;a ser una  opci&oacute;n prometedora en tumores impulsados por RFCE. Por &uacute;ltimo,  recientemente se ha demostrado que la sensibilidad al RFCE-TKI requiere expresi&oacute;n  de <i>E-cadherina</i> en las c&eacute;lulas de carcinoma urotelial (14). Lamentablemente  no se ha demostrado que el gefitinib asociado con Gemcitabina/cisplatino (GC)  mejore la supervivencia en comparaci&oacute;n con el GC o el MVAC s&oacute;lo  (15).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><b><i>Focalizaci&oacute;n de la HER2/neu en el  c&aacute;ncer de vejiga</i></b></font></p>     <p><font face="Verdana" size="2">Se ha demostrado que la prote&iacute;na HER2/neu  (ErbB2) se expresa en el 2% al 74% de los tumores vesicales 10 y varios estudios  han sugerido que la positividad de la HER2/neu est&aacute; asociada con la progresi&oacute;n  del tumor (16,17). Sin embargo, el pron&oacute;stico del valor de la expresi&oacute;n  HER2/neu permanece controvertido, ya que en 184 pacientes con CVNMI y CVMI,  la expresi&oacute;n de HER2/neu no se encontr&oacute; asociada con el estadio,  grado, o supervivencia (9). La expresi&oacute;n combinada de RFCE y HER2/neu  est&aacute; presente en el 34% de los tumores, proporcionando as&iacute; un  razonamiento de base para la inhibici&oacute;n de RFCE/HER2/neu (18). El lapatinib  es un TKI tanto de RFCE como de HER2/neu, que ha mostrado un beneficio moderado  en un estudio fase II en neoadyuvancia (19).</font></p>     <p><font face="Verdana" size="2">Se ha informado que la inmuno-reactividad ErbB-2  y erbB-3 en los tumores vesicales va del 20% a 56% y 11% a 30%, respectivamente  (10). Por &uacute;ltimo, la co-expresi&oacute;n ErbB1-2 y ErbB2-3 ha sido reconocido  como un factor pron&oacute;stico independiente de baja supervivencia a largo  plazo (17).</font></p>     <p><font face="Verdana" size="2"><b><i>Diana RFCVE (receptor del factor de crecimiento  vascular endotelial) en el c&aacute;ncer de vejiga</i></b></font></p>     <p><font face="Verdana" size="2">La angiog&eacute;nesis tiene un papel cr&iacute;tico  en la progresi&oacute;n y en la met&aacute;stasis del c&aacute;ncer de vejiga  (20). Se ha averiguado que la expresi&oacute;n del gen FCVE est&aacute; relacionada  con la supervivencia c&aacute;ncer-espec&iacute;fica en pacientes con tumores  vesicales localmente avanzados (21). La angiog&eacute;nesis tambi&eacute;n pueden  ser cuantificada por la densidad microvascular (DMV), que predice la posterior  invasi&oacute;n muscular en CVNMI (22) y se correlaciona con la estadificaci&oacute;n  tumoral, grado y pobres resultados en el c&aacute;ncer de vejiga (23).</font></p>     <p><font face="Verdana" size="2">Los TKIs dirigidos al FCVE incluyen sunitinib  y sorafenib, que est&aacute;n bajo evaluaci&oacute;n como TKIs multi-diana en  el c&aacute;ncer vesical (<a target="_blank" href="/img/revistas/urol/v63n9/05t01.jpg">Tabla I</a>). El sunitinib  y sorafenib son TKIs que no s&oacute;lo inducen a la inhibici&oacute;n de la  angiog&eacute;nesis, sino tambi&eacute;n a la activaci&oacute;n de la apoptosis.  El sunitinib ha demostrado actividad, tanto como agente &uacute;nico como en  combinaci&oacute;n con cisplatino en las l&iacute;neas de c&eacute;lulas de  c&aacute;ncer de vejiga (24). Sobre la base del efecto de supervivencia libre  de progresi&oacute;n del sunitinib y sorafenib en pacientes con carcinoma renal  metast&aacute;sico y en el papel potencial de la angiog&eacute;nesis tumoral  en la progresi&oacute;n del c&aacute;ncer de vejiga, estos agentes han sido  probados en c&aacute;ncer de vejiga y mostraron actividad antitumoral contra  el carcinoma urotelial humano como agente &uacute;nico y en combinaci&oacute;n  con cisplatino (25).</font></p>     <p><font face="Verdana" size="2"><b><i>Otros TKIs en el c&aacute;ncer de vejiga</i></b></font></p>     <p><font face="Verdana" size="2">Varias v&iacute;as moleculares que est&aacute;n  implicadas en la carcinog&eacute;nesis y progresi&oacute;n de los tumores vesicales  podr&iacute;an ser atacadas por agentes tales como los inhibidores de la histona  deacetilasa, los inhibidores del proteosoma y los inhibidores de la farnesil-transferasa.  TKIs han demostrado ser eficientes en la orientaci&oacute;n de la farnesil transferasa  (Ftasa), que es responsable de una modificaci&oacute;n post traslaci&oacute;nal  (farnesilaci&oacute;n) necesaria para las prote&iacute;nas implicadas en las  v&iacute;as de transducci&oacute;n de se&ntilde;al, tales como los inhibidores  de las prote&iacute;nas Ras proteins (26). Los inhibidores de la Ftasa incluyen  los TKIs tipifarnib y ionofarnib que s&oacute;lo mostraron respuestas pobres  en los estudios de fase II (27, 28).</font></p>     <p><font face="Verdana" size="2"><b><i>Los TKI en el c&aacute;ncer de pr&oacute;stata</i></b></font></p>     <p><font face="Verdana" size="2">El c&aacute;ncer de pr&oacute;stata (CaP) es  la segunda causa de mortalidad por c&aacute;ncer entre los hombres de Europa  occidental y de los Estados Unidos (5). La mayor&iacute;a de muertes est&aacute;n  causadas por met&aacute;stasis de c&aacute;ncer de pr&oacute;stata hormono-refractario  (CPHR). El CaP avanzado o metast&aacute;sico tratado primariamente con terapia  de deprivaci&oacute;n androg&eacute;nica, ya sea por castraci&oacute;n quir&uacute;rgica  (orquiectom&iacute;a) o castraci&oacute;n m&eacute;dica con antagonistas de  la hormona liberadora luteinizante (LHRH) con o sin anti-andr&oacute;genos (29).  Aunque estos tratamientos dan como resultado la estabilizaci&oacute;n o regresi&oacute;n  de la enfermedad metast&aacute;sica en el 80 % de los pacientes (30), la mayor&iacute;a  de estos pacientes progresan a CPHR (31). La progresi&oacute;n a CPHR resulta  en que menos del 50% de los pacientes viven a los 5 a&ntilde;os. El tratamiento  de primera l&iacute;nea para el CPHR es docetaxel en combinaci&oacute;n con  prednisona (32, 33). La quimioterapia basada en sesiones de docetaxel cada 3  semanas demostr&oacute; una importante mejor&iacute;a en la calidad de vida  y en la supervivencia global en comparaci&oacute;n con el mitoxantrone. Sin  embargo, el promedio de beneficio de supervivencia sigue siendo decepcionantemente  corto (2 a 3 meses) y una proporci&oacute;n significativa de los pacientes no  responden a la quimioterapia (32, 33). Para los pacientes con enfermedad refractaria  al docetaxel, no hay tratamiento de segunda l&iacute;nea con efectividad probada  y se necesitan nuevas dianas celulares para el tratamiento.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Diversas mol&eacute;culas implicadas en la proliferaci&oacute;n  celular, apoptosis y angiog&eacute;nesis pueden ofrecer enfoques alternativos  para el tratamiento del CPHR. El RFCE y RFCVE activan dos de las principales  v&iacute;as de transducci&oacute;n de se&ntilde;ales que conducen a la progresi&oacute;n  o met&aacute;stasis tumoral. Los inhibidores de la tirosin-quinasa (TKIs) est&aacute;n  interfiriendo con estos receptores, por lo tanto representan un enfoque prometedor  para el tratamiento del CPHR.</font></p>     <p><font face="Verdana" size="2"><b><i>Actividades del RFCE y el FRGVE en el c&aacute;ncer de pr&oacute;stata (<a href="#t2">Tabla II</a>)</i></b></font></p>     <p>&nbsp;</p>     <p><a name="t2"></a></p>     <p align="center"><img src="/img/revistas/urol/v63n9/05t02.jpg"></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2">La familia de receptores del factor epid&eacute;rmico  de crecimiento incluyen los receptores RFCE o ErbB-1, Su 2/neu o erbB-2, Her  3 o erbB-3 y 4 o Su ErbB-4. Cuando se estimulan, el RFCE y el erbB-2 puede activar  las v&iacute;as de transducci&oacute;n MAP quinasa y PI3 quinasa que han demostrado  estar involucradas en la progresi&oacute;n del CaP y en la diferenciaci&oacute;n  a CPHR (34, 35). La activaci&oacute;n de la v&iacute;a de se&ntilde;alizaci&oacute;n  del RFCE desempe&ntilde;a un papel importante en el crecimiento, proliferaci&oacute;n  y supervivencia de muchas tumores s&oacute;lidos (36). En el CaP, la expresi&oacute;n  de RFCE parece estar asociada con la progresi&oacute;n de la enfermedad y se  ha estudiado la densidad micro vascular como factor pron&oacute;stico de la  agresividad del c&aacute;ncer de pr&oacute;stata.</font></p>     <p><font face="Verdana" size="2">Di Lorenzo et al, encontraron que la expresi&oacute;n  ErbB-1 aumenta en el CaP, y hace que &eacute;ste se vuelva mas agresivo (37).  Compararon la expresi&oacute;n inmunohistoqu&iacute;mica del ErbB-1 en las diferentes  etapas mismo. La expresi&oacute;n ErbB-1 fue aumentando progresivamente desde  el 41% en CaP sin tratamiento, hasta el 76% en CaP tratados con anti-andr&oacute;genos,  y finalmente al 100% en el CPHR. Del mismo modo Shah et al, descubrieron que  la expresi&oacute;n de ErbB-1 est&aacute; fuertemente asociada con el estadio  hormono-refractario (cociente de probabilidades= 6,67, p&lt;0,001) (38).</font></p>     <p><font face="Verdana" size="2">También se ha demostrado que ErbB-2 est&aacute;  sobre-expresado en el CPHR. Osman et al, estudiaron la expresi&oacute;n ErbB-2  en 45 tumores primarios sin tratar hormonalmente, en 34 tumores primarios despu&eacute;s  de la terapia androg&eacute;nica, y en 20 lesiones metast&aacute;sicas (39).  Encontraron una sobre-expresi&oacute;n de ErbB-2 en un 20%, 67% y 80% de los  pacientes, que sugiere que la expresi&oacute;n ErbB-2 aumenta con la agresividad  de la enfermedad. Por &uacute;ltimo, se ha demostrado un cambio regulaci&oacute;n  paracrina a regulaci&oacute;n autocrina del RFCE en el CPHR (40).</font></p>     <p><font face="Verdana" size="2">La angiog&eacute;nesis es tambi&eacute;n un paso  importante en la progresi&oacute;n del c&aacute;ncer de pr&oacute;stata temprano  a enfermedad avanzada y es esencial en la met&aacute;stasis de los tumores s&oacute;lidos  (41).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><b><i>Diana RFCE en el c&aacute;ncer de pr&oacute;stata</i></b></font></p>     <p><font face="Verdana" size="2">El uso de la terapia dirigida mediante TKIs a  las v&iacute;a de se&ntilde;alizaci&oacute;n del RFCE ha mostrado una inhibici&oacute;n  del crecimiento tumoral no solo en los CaP andr&oacute;geno- dependientes, sino  tambi&eacute;n en CPHR (42). Se han investigado varios f&aacute;rmacos TKI,  pero s&oacute;lo unos pocos han alcanzado la fase II o III de ensayo cl&iacute;nico.</font></p>     <p><font face="Verdana" size="2">El gefitinib (Iressa<sup>&reg;</sup>, de AstraZeneca) se  dirige a ErbB-1 y es el TKI m&aacute;s ampliamente estudiado en el CaP. Ha mostrado  actividad antitumoral en estudios precl&iacute;nicos con una inhibici&oacute;n  de crecimiento de 70 a 80% de las l&iacute;neas c&eacute;lulares de xenoinjertos  de tumores de pr&oacute;stata humanos transfectados a ratones (43). Ha pasado  por numerosos estudios de monoterapia en fase I con una amplia gama de tumores  s&oacute;lidos, incluyendo CaP (44-46). De los 19 pacientes con CPHR inscritos  en estos estudios de fase I, uno tuvo una respuesta en el tejido objetivo con  disminuci&oacute;n &gt; 50% en el nivel de PSA durante 6,5 meses, otro tuvo  disminuci&oacute;n del 50% del PSA durante 2,5 meses y casi todos los pacientes  tuvieron alivio del dolor necesitando menor medicaci&oacute;n. Recientemente  se han publicado dos ensayos de fase II investigando la actividad como agente  &uacute;nico de gefitinib en el CPHR. (<a target="_blank" href="/img/revistas/urol/v63n9/05t03.jpg">Tabla  III</a>)</font></p>     <p><font face="Verdana" size="2">Canil et al investigaron la eficacia y toxicidad  del gefitinib en un estudio multi-c&eacute;ntrico aleatorio. 47 Cuarenta pacientes  con CPHR m&iacute;nimamente sintom&aacute;tico fueron asignados aleatoriamente  a 250 mg o 500 mg diarios de gefitinib. Ninguno de los pacientes mostraron una  disminuci&oacute;n significativa de PSA u otro tipo de respuesta objetiva apreciable.  Sin embargo 35 pacientes (87%) lograron la estabilizaci&oacute;n de los niveles  de PSA durante 2,5 a 16,5 meses. Small et al. estudiaron el efecto de 500 mg  al d&iacute;a de gefitinib en un estudio abierto multic&eacute;ntrico.48 De  los 40 pacientes evaluables con CPHR no metast&aacute;sico, ninguno tuvo una  disminuci&oacute;n en los niveles de PSA &gt; 50% y s&oacute;lo 3 tuvieron un  PSA estable durante los 6 meses de tratamiento. El nivel de expresi&oacute;n  del RFCE se determin&oacute; en 16 pacientes y la mayor&iacute;a (12) mostraron  tinci&oacute;n importante. No hubo relaci&oacute;n entre la expresi&oacute;n  de RFCE y la disminuci&oacute;n del PSA. Tambien se estudi&oacute; la calidad  de vida y no mejor&oacute; de forma significativa cocon el tratamiento con gefitinib  en este estudio.</font></p>     <p><font face="Verdana" size="2">El erlotinib (Tarceva<sup>&reg;</sup>, Roche) se dirige  al RFCE (ErbB-1). Se introdujo por primera vez en la recurrencia del c&aacute;ncer  de pulm&oacute;n no microc&iacute;tico, y ha demostrado mejorar la supervivencia  cuando se administra como agente &uacute;nico. Gravis et al, estudiaron el efecto  del erlotinib en un ensayo monoc&eacute;ntrico de fase II (49). Se administr&oacute;  erlotinib 150 a 200 mg diarios hasta la progresi&oacute;n de la enfermedad a  treinta pacientes con CaP avanzado o metast&aacute;sico. El erlotinib mostr&oacute;  un beneficio cl&iacute;nico con una mejor&iacute;a en el 40% de los pacientes  en el indice de Karnofsky. Ning&uacute;n paciente tuvo una disminuci&oacute;n  del PSA, pero el 14% logr&oacute; la estabilizaci&oacute;n y el tiempo de duplicaci&oacute;n  del PSA se increment&oacute; en un 33% de los pacientes. Gross et al, investigaron  la asociaci&oacute;n de erlotinib y docetaxel en un ensayo multic&eacute;ntrico  de fase II (50). Veintid&oacute;s pacientes fueron tratados con docetaxel 60mg/m2  en el d&iacute;a 1 y 150 mg de erlotinib en los d&iacute;as 1 al 21. Ocho pacientes  no tuvieron respuesta objetiva, pero en 6 hubo una disminuci&oacute;n &gt; 50%  en las cifras de PSA.</font></p>     <p><font face="Verdana" size="2"><b><i>FCEV en el c&aacute;ncer de pr&oacute;stata</i></b></font></p>     <p><font face="Verdana" size="2">El sorafenib (Nexavar<sup>&reg;</sup>, Bayer) es un inhibidor multi-quinasa orientado a la v&iacute;a kinasa Ras/Raf, el FCEV y el factor  de crecimiento derivado de las plaquetas.</font></p>     <p><font face="Verdana" size="2">En el &aacute;mbito del CPHR se han desarrollado  numerosos estudios en fase II. El primer ensayo reclut&oacute; 22 pacientes  con CPHR que recibieron 400 mg dos veces al d&iacute;a durante 28 d&iacute;as  (51). Ninguno de ellos tuvo disminuci&oacute;n &gt; 50% de PSA, y 7 pacientes  estuvieron libres de progresi&oacute;n de PSA en 4 meses (31,8%). La mediana  del tiempo hasta la progresi&oacute;n del PSA fue de 8 semanas (rango de 6 a  41). No obstante, los autores encontraron resultados discordantes entre las  respuestas de PSA y evidencias radiogr&aacute;ficas de met&aacute;stasis &oacute;seas:  dos pacientes tuvieron reducci&oacute;n en el nivel de PSA, pero evidencias  radiogr&aacute;fica de progresi&oacute;n de met&aacute;stasis. Adem&aacute;s,  de los pacientes que muestran progresi&oacute;n de la enfermedad despu&eacute;s  del primer ciclo de tratamiento (n = 21), 13 han progresado s&oacute;lo por  criterios de PSA y 6 de ellos ten&iacute;an una disminuci&oacute;n espont&aacute;nea  del PSA despu&eacute;s de que se suspendi&oacute; el f&aacute;rmaco (28,6%).  El ensayo fue ampliado a 46 pacientes (52). Se modificaron los criterios de  progresi&oacute;n de la enfermedad y la evidencia radiogr&aacute;fica de nuevas  lesiones o progresiones metast&aacute;sicas fueron valoradas seg&uacute;n los  "Criterios de evaluaci&oacute;n de respuesta en Tumores S&oacute;lidos  (RECIST)".</font></p>     <p><font face="Verdana" size="2">La progresi&oacute;n de PSA se ha valorado pero  no utilizado como criterio de progresi&oacute;n. De los 24 pacientes que participaron  en la segunda fase del estudio, 10 tuvieron enfermedad estable (41,6%) y la  duraci&oacute;n media de la estabilizaci&oacute;n de la enfermedad fue de 18  semanas (rango de 15 a 48). Del mismo modo, Chi et al encontraron s&oacute;lo  en el 3,6% disminuci&oacute;n de PSA&gt; 50% tras 4 semanas de tratamiento (53).  Ambos ensayos sugieren que el PSA no es un marcador adecuado para la evaluaci&oacute;n  de la eficacia del sorafenib despu&eacute;s de un ciclo de tratamiento.</font></p>     <p><font face="Verdana" size="2">Otro ensayo interesante con participaci&oacute;n  de 55 pacientes con CPHR no tratados previamente con quimioterapia recibieron  400 mg de sorafenib dos veces al d&iacute;a continuamente durante 12 semanas  (54). Quince pacientes mostraron estabilizaci&oacute;n de la enfermedad despu&eacute;s  de 12 semanas (27,3%) y 2 pacientes presentaron disminuci&oacute;n &gt; 50%  de PSA (3,6%). La mediana de tiempo libre de progresi&oacute;n de supervivencia  fue de 8 semanas (rango 6,4 a 14,7). Entre los pacientes con enfermedad estable,  11 hab&iacute;an estabilizado los niveles de PSA despu&eacute;s de 12 semanas  de tratamiento.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><b><i>Otros TKIs en c&aacute;ncer de pr&oacute;stata</i></b></font></p>     <p><font face="Verdana" size="2">Las quinasas de la familia Src (SFKs) son la  mayor familia de tirosin-quinasas no receptoras de prote&iacute;nas y son responsables  de una transducci&oacute;n de se&ntilde;al durante la diferenciaci&oacute;n,  la adhesi&oacute;n y migraci&oacute;n de las c&eacute;lulas tumorales.</font></p>     <p><font face="Verdana" size="2">El dasatinib (Sprycel<sup>&reg;</sup>, Bristol-Myers Squibb)  es una peque&ntilde;a mol&eacute;cula inhibidora de tirosin-quinasa que bloquea  SFKs, factor de crecimiento derivado de plaquetas, c-kit, Bcr-Abl y efrinas  (55). Los estudios precl&iacute;nicos demostraron que el dasatinib inhibe las  actividades de las quinasas SFKs, Lyn y Src en ambos, CaP andr&oacute;geno-dependiente  e independiente. Nam et al. descubrieron una correlaci&oacute;n entre la inhibici&oacute;n  de estas actividades de la quinasa por el dasatinib y la reducci&oacute;n de  la adhesi&oacute;n, migraci&oacute;n e invasi&oacute;n celular en sistemas de  modelos in vitro (56). Los mismos efectos fueron observados por Park et al,  en modelos en rat&oacute;n (57). Se hall&oacute; que el dasatinib inhibe el  crecimiento de met&aacute;stasis de los ganglios linf&aacute;ticos del CaP.  Recientemente se ha informado de los resultados preliminares de un estudio de  fase II, incluyendo 27 pacientes con CPHR y met&aacute;stasis &oacute;seas que  fueron tratados con dasatinib durante 12 semanas consecutivas. 16 tuvieron enfermedad  estable y 1 present&oacute; una mejor&iacute;a en las exploraciones radiol&oacute;gicas  &oacute;seas despu&eacute;s de 12 semanas de tratamiento.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Conclusi&oacute;n</b></font></p>     <p><font face="Verdana" size="2">Los TKIs representan un tratamiento potencial  prometedor del CPHR pero tienen que dise&ntilde;arse m&aacute;s estudios fase  III. Las terapias m&uacute;ltiples de bloqueo de quinasas, probablemente puedan  ser m&aacute;s eficientes. Hasta ahora, se utilizan pocas terapias dirigidas  en el c&aacute;ncer de vejiga, pero parece evidente que los agentes quimioter&aacute;picos  comunes deben ir acompa&ntilde;ados por una nueva generaci&oacute;n de f&aacute;rmacos  que reconozcan objetivos espec&iacute;ficos en o sobre las c&eacute;lulas tumorales.  Este nuevo enfoque es muy prometedor en el tratamiento, en un futuro pr&oacute;ximo  de los tumores urol&oacute;gicos.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Bibliograf&iacute;a y lecturas recomendadas (*lectura de inter&eacute;s y **lectura fundamental)</b></font></p>     <!-- ref --><p><font face="Verdana" size="2">1. Vojtek AB, Hollenberg SM and Cooper JA: Mammalian Ras interacts directly with the serine/threonine kinase Raf. Cell. 74: 205-14, 1993.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174577&pid=S0004-0614201000090000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    ]]></body>
<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2">2. Ciardiello F, Caputo R, Bianco R, Damiano V, Fontanini G, Cuccato S, De Placido S, Bianco AR and Tortora G: Inhibition of growth factor production and angiogenesis in human cancer cells by ZD1839 (Iressa), a selective epidermal growth factor receptor tyrosine kinase inhibitor. Clin Cancer Res. 7: 1459-65, 2001.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174579&pid=S0004-0614201000090000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">3. Stommel JM, Kimmelman AC, Ying H, Nabioullin R, Ponugoti AH, Wiedemeyer R, Stegh AH, Bradner JE, Ligon KL, Brennan C et al.: Coactivation of receptor tyrosine kinases affects the response of tumor cells to targeted therapies. Science. 318: 287-90, 2007.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174581&pid=S0004-0614201000090000500003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">4. Motzer RJ, Hutson TE, Tomczak P, Michaelson MD, Bukowski RM, Rixe O, Oudard S, Negrier S, Szczylik C, Kim ST et al.: Sunitinib versus interferon alfa in metastatic renal-cell carcinoma. N Engl J Med. 356: 115-24, 2007.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174583&pid=S0004-0614201000090000500004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">5. Jemal A, Siegel R, Ward E, Hao Y, Xu J, Murray T and Thun MJ: Cancer statistics, 2008. CA Cancer J Clin. 58: 71-96, 2008.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174585&pid=S0004-0614201000090000500005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">6. Botteman MF, Pashos CL, Redaelli A, Laskin B and Hauser R: The health economics of bladder cancer: a comprehensive review of the published literature. Pharmacoeconomics. 21: 1315-30, 2003.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174587&pid=S0004-0614201000090000500006&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><font face="Verdana" size="2">12. McHugh LA, Kriajevska M, Mellon JK and Griffiths TR: Combined treatment of bladder cancer cell lines with lapatinib and varying chemotherapy regimens-evidence of schedule-dependent synergy. Urology. 69: 390-4, 2007.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174599&pid=S0004-0614201000090000500012&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">13. Natale RB: Biologically targeted treatment of non-small-cell lung cancer: focus on epidermal growth factor receptor. Clin Lung Cancer. 5 Suppl 1: S11-7, 2003.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174601&pid=S0004-0614201000090000500013&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">14. Black PC, Brown GA, Inamoto T, Shrader M, Arora A, Siefker-Radtke AO, Adam L, Theodorescu D, Wu X, Munsell MF et al.: Sensitivity to epidermal growth factor receptor inhibitor requires E-cadherin expression in urothelial carcinoma cells. Clin Cancer Res. 14: 1478-86, 2008.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174603&pid=S0004-0614201000090000500014&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">15. Philips GK, Halabi S, Sanford BL, Bajorin D and Small EJ: A phase II trial of cisplatin, fixed dose-rate gemcitabine and gefitinib for advanced urothelial tract carcinoma: results of the Cancer and Leukaemia Group B 90102. BJU Int. 101: 20-5, 2008.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174605&pid=S0004-0614201000090000500015&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">16. Chow NH, Chan SH, Tzai TS, Ho CL and Liu HS: Expression profiles of ErbB family receptors and prognosis in primary transitional cell carcinoma of the urinary bladder. Clin Cancer Res. 7: 1957-62, 2001.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174607&pid=S0004-0614201000090000500016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    ]]></body>
<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2">17. Kruger S, Weitsch G, Buttner H, Matthiensen A, Bohmer T, Marquardt T, Sayk F, Feller AC and Bohle A: HER2 overexpression in muscle-invasive urothelial carcinoma of the bladder: prognostic implications. Int J Cancer. 102: 514-8, 2002.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174609&pid=S0004-0614201000090000500017&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">18. Bellmunt J, Hussain M and Dinney CP: Novel approaches with targeted therapies in bladder cancer. Therapy of bladder cancer by blockade of the epidermal growth factor receptor family. Crit Rev Oncol Hematol. 46 Suppl: S85-104, 2003.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174611&pid=S0004-0614201000090000500018&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">19. Wulfing C, von Struensee D, Bierer S, Bogemann M, Hertle L and Eltze E: Expression of Her2/neu in locally advanced bladder cancer: implication for a molecular targeted therapy. Aktuelle Urol. 36: 423-9, 2005.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174613&pid=S0004-0614201000090000500019&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">20. Crew JP: Vascular endothelial growth factor: an important angiogenic mediator in bladder cancer. Eur Urol. 35: 2-8, 1999.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174615&pid=S0004-0614201000090000500020&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">21. Slaton JW, Millikan R, Inoue K, Karashima T, Czerniak B, Shen Y, Yang Y, Benedict WF and Dinney CP: Correlation of metastasis related gene expression and relapse-free survival in patients with locally advanced bladder cancer treated with cystectomy and chemotherapy. J Urol. 171: 570-4, 2004.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174617&pid=S0004-0614201000090000500021&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><font face="Verdana" size="2">57. Park SI, Zhang J, Phillips KA, Araujo JC, Najjar AM, Volgin AY, Gelovani JG, Kim SJ, Wang Z and Gallick GE: Targeting SRC family kinases inhibits growth and lymph node metastases of prostate cancer in an orthotopic nude mouse model. Cancer Res. 68: 3323-33, 2008.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1174689&pid=S0004-0614201000090000500057&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><a name="back"></a><a href="#top"><img src="/img/revistas/urol/v63n9/seta.jpg" border="0"></a><b>Direcci&oacute;n para correspondencia:</b>    <br>Prof. Jean-Jacques Patard    <br>Rennes University Hospital    <br>CHRU Pontchaillou    <br>Department of Urology    <br>Rue Henri Le Guillou    ]]></body>
<body><![CDATA[<br>35033 Rennes Cedex, France    <br><a href="mailto:jean-jacques.patard@chu-rennes.fr">jean-jacques.patard@chu-rennes.fr</a></font></p>     <p><font face="Verdana" size="2">Aceptado para publicar: 21 de octubre 2009</font></p>      ]]></body><back>
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