<?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>0378-4835</journal-id>
<journal-title><![CDATA[Oncología (Barcelona)]]></journal-title>
<abbrev-journal-title><![CDATA[Oncología (Barc.)]]></abbrev-journal-title>
<issn>0378-4835</issn>
<publisher>
<publisher-name><![CDATA[Alpe Editores, S.A.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0378-48352004000600011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Radioterapia adyuvante en el cáncer de mama]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marsiglia]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Widakowich]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Institut Gustave-Roussy  ]]></institution>
<addr-line><![CDATA[Villejuif ]]></addr-line>
<country>Francia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2004</year>
</pub-date>
<volume>27</volume>
<numero>6</numero>
<fpage>55</fpage>
<lpage>63</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0378-48352004000600011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0378-48352004000600011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0378-48352004000600011&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[ <p align="right"><b><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">RADIOTERAPIA    INTRAOPERATORIA (RIO)</font></b></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="3"><b>Radioterapia    adyuvante en el c&aacute;ncer de mama</b></font></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>&nbsp;</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>H. Marsiglia;    C. Widakowich; R. Rivera</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Institut    Gustave-Roussy, Villejuif (Francia)</font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="3"><b>I. Epidemiolog&iacute;a    del c&aacute;ncer de mama</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"> <b>Datos    epidemiol&oacute;gicos sobre el c&aacute;ncer de mama</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">El c&aacute;ncer    de mama es el c&aacute;ncer m&aacute;s frecuente de la mujer occidental, con    11.000 muertes por a&ntilde;o solamente en Francia. La incidencia de esta patolog&iacute;a    aumenta con la edad, llegando su m&aacute;ximo alrededor de los 70 a&ntilde;os.</font></p>     <p>&nbsp;</p>     <p align="center"><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>&nbsp;<img src="/img/onco/v27n6/11t1.gif"></b></font></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Se espera    un aumento de los casos diagnosticados en Europa en el decenio 2000-2010 en    la mujer de la tercera edad, en raz&oacute;n al aumento constante de la esperanza    de vida, m&aacute;s marcado en la mujer que en el hombre (Kurtz 2002).</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Hoy en d&iacute;a    el riesgo de desarrollar un c&aacute;ncer de mama antes de los 90 a&ntilde;os    es del 11% (1 de cada 9 mujeres desarrollara un c&aacute;ncer de mama antes    de los 90 a&ntilde;os). El c&aacute;ncer de mama representa entonces, un problema    de salud p&uacute;blica importante, sobretodo en el grupo en el que el aumento    de la esperanza de vida de las mujeres, coincide con la alta tasa de incidencia    de este tumor.</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Dos cosas    podemos decir con certeza: primero, que la acci&oacute;n terap&eacute;utica    debe ser considerada como un problema m&eacute;dico-econ&oacute;mico de primer    orden (Balducci 1997). Y segundo, que se debe detectar lo m&aacute;s precozmente    posible el c&aacute;ncer de mama. En los &uacute;ltimos a&ntilde;os, el 50%    de los tumores han sido diagnosticados en un tama&ntilde;o menor a los 2 cm,    y el diagn&oacute;stico de las lesiones no palpables ha representado el 40%    de los c&aacute;nceres detectados (<a href="#fig1">Fig. 1</a>). En este orden,    la detecci&oacute;n de los carcinoma <i>in situ</i> aumenta tambi&eacute;n,    y puede representar hoy en d&iacute;a el 25% de los tumores diagnosticados.</font></p>     <p align="center"><a name="fig1"></a></p>     <p align="center">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="center"><img src="/img/onco/v27n6/11f1.gif"></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">De esta    manera, las estrategias terap&eacute;uticas del tipo cirug&iacute;a conservadora    y los tratamientos adyuvantes est&aacute;n directamente relacionados con el    aumento de la detecci&oacute;n de los estadios precoces. El acrecentamiento    de la incidencia del c&aacute;ncer de mama en la mujer de cierta edad nos obliga    a redirigir los protoclos cl&aacute;sicos de la radioterapia, modific&aacute;ndolos    por esquemas de administraci&oacute;n m&aacute;s cortos, asegurando un buen    resultado est&eacute;tico, junto a un m&aacute;ximo control local en relaci&oacute;n    a los a&ntilde;os de supervivencia.</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">&nbsp;</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="3"><b>II. Standard    de la radioterapia en el carcinoma in situ</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">El carcinoma    canalicular <i>in situ</i> (CCIS), representaba el 5% de los c&aacute;nceres    de mamas ante el diagn&oacute;stico mamografico, y hoy en d&iacute;a, esta tasa    es del 20-30%. El <i>in situ</i> en este caso, es una lesi&oacute;n de muy buen    pron&oacute;stico con menos de un 25% de evoluci&oacute;n metast&aacute;sica,    donde la mastectom&iacute;a era el tratamiento de referencia en la d&eacute;cada    del 70, con una cura del 98% de los casos (Holland 1985, De Vita, 2001). En    esta d&eacute;cada presente, muchos autores han intentado tratar al c&aacute;ncer    <i>in situ,</i> con cirug&iacute;a sin Rt externa, pero la tasa de recidiva    local ha aumentado a una media de 25-35% a los 10 a&ntilde;os. Con la finalidad    de mejorar el control local, muchos autores propusieron la cirug&iacute;a+Rt.    (Fisher, 1993), cosa que ha bajado la tasa de recidivas locales a un 8-15 %    a los 10 a&ntilde;os, en relaci&oacute;n a la calidad de la ex&eacute;resis    quir&uacute;rgica, de la edad del paciente, el grado, y los sub-tipos histol&oacute;gicos.</font></p>     <p>&nbsp;</p>     <p align="center"><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><a href="/img/onco/v27n6/11t2.gif">tabela    2</a></font></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Los trials    randomizados (exclusivos para los CCIS) <i>National Surgical Adjuvant Breast    and Bowel Project B17 (NSABP B-17),</i> y <i>European Organization for Research    and Treatment of Cancer (EORTC) 10853</i> han comparado la tumorectom&iacute;a    <i>versus</i> la tumorectom&iacute;a + radioterapia (50 Gy en un booster), y    un trabajo multic&eacute;ntrico retrospectivo franc&eacute;s (Cutuli, 2002)    confirm&oacute; los beneficios de la irradiaci&oacute;n despu&eacute;s de la    tumorectom&iacute;a (sin modificaci&oacute;n de la sobrevida).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">La mitad    de las recidivas son recidivas <i>in situ</i>; la otra mitad son recidivas en    progreso bajo la forma de carcinomas infiltrantes y, en este caso, podemos ver    un desarrollo de met&aacute;stasis de un 15 a 20%, dando un pron&oacute;stico    peyorativo.</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Perspectivas    terap&eacute;uticas</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><i>Consenso    de St. Gallen</i></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Las indicaciones    standard sugieren una tumorectom&iacute;a sin curaje axilar con radioterapia    sistemica (50 Gy) en los pacientes portadores de tumores de una talla inferior    a los 4 cm, sin localizaci&oacute;n multifocal, y una mastectom&iacute;a (seguida    de una reconstrucci&oacute;n mamaria inmediata) si la talla es superior a los    4 cm. o si hay localizaci&oacute;n multifocal.</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><i>Recomendaciones</i></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">En todos    los casos, la terap&eacute;utica debe ser &oacute;ptima, haciendo una mamograf&iacute;a    pre-operatoria completa, una ex&eacute;resis completa de la lesi&oacute;n con    m&aacute;rgenes mayores a 1 cm, an&aacute;lisis histol&oacute;gico preciso (talla,    m&aacute;rgenes y grado), y una mamograf&iacute;a post-operatoria de control    antes de comenzar la radioterapia, para verificar la ausencia de microcalcificaciones    residuales. Se debe aumentar el control en el caso de ser pacientes en riesgo,    como los son la mujer joven, una ex&eacute;resis lim&iacute;trofe, o el alto    grado tumoral.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="3"><b>III.    Perspectivas terap&eacute;uticas en el carcinoma intracanalicular in situ</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Los trials    randomizados de la actualidad, muestran que todos los subgrupos de pacientes    (edad, talla, grado, m&aacute;rgenes portadores de un CCIS, beneficiados por    la RT, disminuyen un 50 % el riesgo de recidiva despu&eacute;s de la cirug&iacute;a,    y particularmente las recidivas bajo la forma infiltrante.</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Dentro de    este panorama, se nos aparecen varias preguntas:</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">1. No podemos    definir actualmente los factores pron&oacute;sticos para predecir la recidiva    local del tipo infiltrante. Los intentos en el campo de la prevenci&oacute;n    de recidivas intracanaliculares e infiltrantes de los CCIS siguen siendo hoy    en d&iacute;a el objeto de numerosos estudios:</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"> &#149;    Estudio que testea al tamoxifeno (NSABP B-24, Fisher 2001) mostrando que una    mujer sobre 20 pueden esperar un beneficio por el tamoxifeno; una de 52 evitar&aacute;    una recidiva local invasiva y una de 128 evitar&aacute; una recidiva local <i>in    situ.</i> Inclusive, es necesario relativizar los resultados dombo-emb&oacute;licos    inducidos por el tamoxifeno.</font> </p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"> &#149;    Estudio prospectivo NSABP B-35 randomizado en 3.000 pacientes post-menop&aacute;usicas    con CCIS comparando el tamoxifeno versus el anastrazol, despu&eacute;s de la    tumorectom&iacute;a + RT.;</font> </p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"> &#149;    Proyecto prospectivo utilizando los inhibidores de la Cox-2 para la prevenci&oacute;n    de recidivas invasivas de los carcinomas canaliculares <i>in situ</i> de la    mujer menor a 50 a&ntilde;os. Fase III randomizado (despu&eacute;s de la tumorectom&iacute;a+    radioterapia 50 Gy) celecoxib <i>versus</i> placebo (en curso de aprobaci&oacute;n    al IGR).</font> </p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">2. No existen    Trials que controlen el efecto de la dosis de la radioterapia en los CCIS. La    dosis standard de 50 Gy podr&iacute;a ser subestimada para el control local    de los CCIS (Kurtz, 2002) debiendo estudiarse el efecto de una dosis complementaria.    En este sentido, hay un estudio randomizado (Estudio EORTC dado a aprobaci&oacute;n    <i>Breast cancer conserving therapy in DCIS)</i> evaluando el impacto de un    boost sobre el control local y la incidencia de recidivas invasivas y no invasivas.    1346 pacientes seran incluidos en dos grupos randomizados: 50 Gy versus 66 Gy    (50+ 16).</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">3. Una tumorectom&iacute;a    sin radioterapia podr&iacute;a estar indicada en los pacientes de muy buen pron&oacute;stico    (talla &lt;1 cm, bajo grado, unifocal, margenes <u>&gt;</u>1 cm), aunque aqu&iacute;    no tenemos trabajos validados hasta la fecha. El score de Van Nuys (talla-margen-grado)    podr&iacute;a ser uno de ellos, (23% de comedonecrosis sobre un total de 93    pacientes de estas caracter&iacute;sticas), pero no ha sido aprobado como estudio    prospectivo aun.</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>&nbsp;</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="3"><b>IV. Standard    de la radioterapia en los carcinoma infiltrante</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Tratamientos    conservadores</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Los c&aacute;nceres    de mama pueden beneficiarse de un tratamiento conservador. En efecto, la asociaci&oacute;n    Rt+Ct es la estreategia m&aacute;s utilizada. Dentro de este caso, la cirug&iacute;a    ha mostrado una evoluci&oacute;n remarcable.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">La cirug&iacute;a    en el tratamiento del c&aacute;ncer de mama ha estado vista como un arma eficaz    pero agresiva, sobre todo desde el punto de vista psicol&oacute;gico. Las primeras    intervenciones descritas por Halsted (Brenier 1967, Ravitch 1971) mostraban    secuelas funcionales, como el brazo aumentado de tama&ntilde;o (Chardot 1968,    Arnulf 1971). La mastectom&iacute;a radical modificada por Patey (Nemoto 1975,    Cunsulo 1979, Maddox 1983) logr&oacute; mejorar ciertos problemas funcionales    (siempre hablando de las secuelas de miembro superior) pero hubo que esperar    hasta el comienzo de los a&ntilde;os 80 (Veronesi 1981, Fisher 1989, Fisher    1993), para ver la aparici&oacute;n de un tratamiento realmente conservador,    y el advenimiento de protocolos de cirug&iacute;a conservadora+radioterapia    adyuvante, que llegaron a brindar resultados muy esperanzadores. En efecto,    los resultados de los diferentes trials randomizados publicados a lo largo de    estas d&eacute;cadas (Fischer 1989, Jacobson 1995, Arriagada 1996, Van Dongen    2000) confirman la equivalencia en t&eacute;rminos de sobrevida global entre    los pacientes tratados por cirug&iacute;a radical no conservadora y aquellos    que pod&iacute;an beneficiarse de un tratamiento conservador radio-quir&uacute;rgico <b>&nbsp;</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Comentario    de los trials mastectom&iacute;a <i>versus</i> tratamiento conservador</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">El l&iacute;mite    superior del di&aacute;metro tumoral para autorizar un tratamiento conservador    variaba entre los 2 y los 5 cm. De la misma manera los trials difer&iacute;an    seg&uacute;n la naturaleza de la cirug&iacute;a conservadora y la quimioterapia    utilizada. La radioterapia era administrada a 45 a 50 Gy en 4,5 a 5 semanales.    La tasa de recidivas locales var&iacute;a seg&uacute;n los diferentes estudios,    entre un 5 a 20% despu&eacute;s del tratamiento conservador y un 3 a 12% despu&eacute;s    de la mastectom&iacute;a. La tasa de met&aacute;stasis a distancia y la sobrevida    no eran, sin embargo, tan diferentes seg&uacute;n el tipo de tratamiento. Es    decir, la presencia de una invasi&oacute;n ganglionar axilar no estaba asociada    a una diferencia en la sobrevida entre los dos tipos de tratamientos. Tres grandes    m&eacute;ta-an&aacute;lisis (EBCTCG, 1995, Winchester, 1997, Morris, 1997),    confirmaron esta igualdad en la sobrevida. De igual manera, no exist&iacute;a    una diferencia entre las tasas de recidivas contralaterales y los tumores homolaterales    no carcinomatosos. Finalmente, estos resultados fueron el standard de los a&ntilde;os    80: cirug&iacute;a conservadora y radioterapia de la mama para los carcinomas    menores a 5cm (NIH Consensus 1991).</font></p>     <p>&nbsp;</p>     <p align="center"><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><a href="/img/onco/v27n6/11t3.gif">tabela    3</a></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><a href="/img/onco/v27n6/11t4.gif">tabela    4</a></font></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Trials    randomizados comparando la cirug&iacute;a conservadora sola <i>versus</i> cirug&iacute;a    seguida de irradiaci&oacute;n</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Entonces,    &iquest;podemos decir que la radioterapia es indispensable en caso de tratamiento    de mama conservador? Los trials randomizados que respondieron a esta cuesti&oacute;n    (Fischer 1995, Clark 1996, Liljergen 1999, Veronesi 2001), concluyeron todos    que la ausencia de radioterapia post-operatoria, en el tratamiento conservador,    elevaba el riesgo de recidivas a aproximadamente un 30%, contra el 10 % de la    asociaci&oacute;n radio-cirug&iacute;a. De esta manera, la tumorectom&iacute;a    asociada al curetaje axilar, seguida de radioterapia externa, devino al comienzo    de la d&eacute;cada de los 90, el standard de los tratamientos conservadores    de c&aacute;ncer de mama localizados, no inflamatorios, menores a 5 cm.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Comentarios    de los trials</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">El estudio    NASBP B-06 comprend&iacute;a tres tratamientos a comparar: mastectom&iacute;a,    tumorectom&iacute;a sola y tumorectom&iacute;a seguida de radioterapia, incluyendo    los pacientes T1, T2, hasta 4 cm, N0 cl&iacute;nico. En este estudio, despu&eacute;s    de la tumorectom&iacute;a, la RT reduc&iacute;a la tasa de recidivas de 36 a    12% a 15 a&ntilde;os (p&lt;0.001). Esta reducci&oacute;n era todav&iacute;a    m&aacute;s importante cuando hab&iacute;a invasi&oacute;n ganglionar axilar    (tasa de recidiva del 43% para los pacientes N+ no irradiados, <i>versus</i>    6% y tasa de recidiva del 37 % por los pacientes N- no irradiados versus 12    %). Los pacientes con invasi&oacute;n ganglionar fueron todos tratados con una    quimioterapia adyuvante, dando como resultado, el hecho de que el tratamiento    sist&eacute;mico no es suficiente para asegurar el control local de la enfermedad.    En definitiva, estos trials demostraron que la RT despu&eacute;s de la cirug&iacute;a    conservadora disminu&iacute;a el riesgo de recidivas de 60-75% (per sin impacto    sobre la sobrevida global). La RT adyuvante aparec&iacute;a entonces, como el    tratamiento standard despu&eacute;s de la tumorectom&iacute;a o cuadrantectom&iacute;a+curetaje    axilar.</font></p>     <p>&nbsp;</p>     <p align="center"><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><a href="/img/onco/v27n6/11t5.gif">tabela    5</a></font></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Trials    randomizados comparando la eficacia en t&eacute;rminos de recidiva local, de    una irradiaci&oacute;n a 50Gy, <i>versus</i> 50Gy asociados a un complemento    sobre el sitio tumoral</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Los progresos    recientes en materia de tratamiento conservador radio-quir&uacute;rgico del    cancer de mama, se caracterizan por el inter&eacute;s de probar un aumento de    la dosis sobre el sitio tumoral, valorando una diferencia significativa en t&eacute;rminos    de control local de la enfermedad (sin beneficio en la sobrevida). El complemento    de irradiaci&oacute;n es de 10 a 16Gy sobre el lecho tumoral inicial, despu&eacute;s    de la irradiaci&oacute;n del conjunto de la gl&aacute;ndula mamaria a 50 Gy    (Bartelink 2001, Romestaing 1997).</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Comentario    de los trials</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">El estudio    randomizado l'EORTC 22881 (Bartelink 2001), compara el efecto de un complemento    de 16Gy sobre el lecho tumoral y la tasa de recidiva local, dando un amplio    beneficio en esta &uacute;ltima. Esta diferencia es ampliamente significativa    para los pacientes menores a los 40 a&ntilde;os (p=0.002), significativa para    aquellos entre de 41 a 50 a&ntilde;os (p=0.02), cerca de un p&lt;0.05 para los    pacientes entre 51 y 60 a&ntilde;os (p=0.07) y no significativa para los pacientes    mayores 60 a&ntilde;os (p=0.11, <a href="#fig2">Fig. 2</a>).</font></p>     <p align="center"><a name="fig2"></a></p>     ]]></body>
<body><![CDATA[<p align="center">&nbsp;</p>     <p align="center"><img src="/img/onco/v27n6/11f2.gif"></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Si comparamos    los resultados en un valor absoluto, podemos constatar sin embargo, que la eficacia    de un boost de 16 Gy sobre el lecho tumoral permite disminuir en un factor cercano    a 2 el riesgo de recidiva local tanto en mujeres menores de 40 a&ntilde;os (19.5    <i>versus</i> 10,2%) como en los mayores a 60 a&ntilde;os (4 <i>versus</i> 2,5%).    El factor de la edad es altamente significativo, pues el riesgo de recidivas    locales puede depender m&aacute;s de esta variable, que de la "ineficacia del    boost".</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">El estudio    de Lyon (Romestaing 1997), con 1.024 pacientes tratados por tumorectom&iacute;a    y curetaje axilar para los tumores &lt; a 3cm. Los pacientes recib&iacute;an    una irradiaci&oacute;n durante 5 semanas en 20 fracciones, de 50 Gy, seguidas    o no de un complemento por electrones de 10Gy, sobre el lecho tumoral. El seguimiento    fue de una media de 3.3 a&ntilde;os. Cuesti&oacute;n, la tasa de recidivas locales    a 5 a&ntilde;os sin boost fue del 4.5%, y del 3.6% con boost (p=0,044).</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">En lo concerniente    a la realizaci&oacute;n de un boost despu&eacute;s de la resecci&oacute;n completa    de un c&aacute;ncer de mama, no existen datos suficientes para proponer un boost    de radioterapia externa (fotones, electrones) o por curiterapia. La calidad    del resultado est&eacute;tico es controversial seg&uacute;n la t&eacute;cnica,    dependiendo del volumen mamario, de la localizaci&oacute;n tumoral, y de la    calidad del centro medico.</font></p>     <p>&nbsp;</p>     <p align="center"><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><a href="/img/onco/v27n6/11t6.gif">tabela    6</a></font></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Trials    actualizados a largo plazo, mostrando el devenir de las recidivas locales, y    su influencia en la sobrevida</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Numerosos    estudios retrospectivos muestran una eficacia muestran una eficacia de la radioterapia    adyuvante, versus la mastectomia o la cirug&iacute;a conservadora sola. As&iacute;    lo demuestran la actualizaci&oacute;n de los trials hist&oacute;ricos (Veronesi,    Fisher 2002) y los meta-an&aacute;lisis de l'Early Breast Cancer Trialists Collaborative    Group (EBCTCG) publicados en 1995 y 2000.</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Comentarios    de los trials</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Los trials    de Veronesi y Fisher muestran bien que la tasa de recidiva local a largo plazo    no es lineal. Admitimos que esa tasa progresa alrededor de un 1% anual en la    asociaci&oacute;n radio-cirug&iacute;a, y el triple con la cirug&iacute;a sola    (Fisher 2002, <a href="#fig3">Fig. 3</a>).</font></p>     <p align="center"><a name="fig3"></a></p>     <p align="center">&nbsp;</p>     <p align="center"><img src="/img/onco/v27n6/11f3.gif"></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Los resultados    a largo plazo entre mastectom&iacute;a y cuadrantectom&iacute;a con o sin RT    externa, no mostraron variaciones con la sobrevida global (Fisher 2002, Veronesi,    2002).</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Trials    demostrando la correlaci&oacute;n entre recidiva local e influencia en la sobrevida</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Muchos autores    han publicado que el aumento de la incidencia de las met&aacute;stasis a distancia,    se relaciona con la recidiva local, condicionando as&iacute; la sobrevida (Fisher,    1991; Haffty, 1996; Fortin, 1999). El trabajo retrospectivo Koscielny (IJROBP,    1999), compara 3.679 pacientes tratados entre 1954 et 1975 en el Instituto Gustav-Roussy,    mostrando que el plazo medio de aparici&oacute;n de met&aacute;stasis aumenta    de 5 a 15 a&ntilde;os, cuando los pacientes presentaron recidiva local.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Meta-an&aacute;lisis    mostrando el impacto de la RT en la recidiva local y la sobrevida</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Los meta-an&aacute;lisis:    <i>Early Breast Cancer Trialists Collaborative Group (EBCTCG)</i> de 1995 <i>(Effects    of radiotherapy and surgery in early breast cancer; NEJM)</i> y 2000 <i>(Favourable    and unfavourable effects of long-term survival of radiotherapy for early breast    cancer: an overview of the randomised trials; Lancet)</i> volvieron a confirmar    los beneficios de la RT en terminos de control local, y disminuyendo de un 30    a un 10% la incidencia de recidivas a 20 a&ntilde;os (<a href="#fig4">Fig. 4</a>).    Sin embargo, el impacto dentro de la sobrevida global est&aacute; sin demostrar.    Los tratamientos con o sin RT no se diferencian en t&eacute;rminos de sobrevida,    cualquiera sea su status ganglionar. Por otro lado, un an&aacute;lisis sobre    la sobrevida espec&iacute;fica de decesos por c&aacute;ncer, insin&uacute;a    un beneficio de la RT, aumentando de un 48.6 a un 53.4%, la sobrevida (<a href="#fig5">Fig.    5</a>), sin incidencia en la sobrevida global de decesos por enfermedades cardiovasculares    intercurrentes (<a href="#fig6">Fig. 6</a>).</font></p>     <p align="center"><a name="fig4"></a></p>     <p align="center">&nbsp;</p>     <p align="center"><img src="/img/onco/v27n6/11f4.gif"></p>     <p align="center">&nbsp;</p>     <p align="center"><a name="fig5"></a></p>     <p align="center">&nbsp;</p>     <p align="center"><img src="/img/onco/v27n6/11f5.gif"></p>     <p align="center">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="center"><a name="fig6"></a></p>     <p align="center">&nbsp;</p>     <p align="center"><img src="/img/onco/v27n6/11f6.gif"></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Los resultados    remarcan el problema mayor, en la radiotoxicidad card&iacute;aca y pulmonar    (Cuzick 1994, Ruqvist 1992). En definitiva, no puede haber beneficios en la    sobrevida global, si la t&eacute;cnica no es &oacute;ptima.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="3"><b>V. Perspectivas    terap&eacute;uticas en el carcinoma infiltrante</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>Tratamiento    conservador</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Para llevar    a cabo un tratamiento conservador, es necesario seleccionar los pacientes en    funci&oacute;n de su edad, del estadio tumoral y de las caracter&iacute;sticas    de las t&eacute;cnicas que se utilicen en el tratamiento (Rutgers 2001).</font></p>     <blockquote>       ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><i>1.      Pacientes seleccionados para randomizar los beneficios o no de una RT externa:</i></font></p> </blockquote>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Son pacientes    de la 3ra edad, T1, RH+, m&aacute;rgenes-, y tratamiento por tamoxifeno. Hasta    el momento esto est&aacute; avalado solamente por el <i>Scottish Breast Cancer    Group</i>, que est&aacute; en curso de aprobaci&oacute;n <i>(A randomised breast    cancer trial to assess local control in older patients-post operative radiotherapy    in minimum risk elderly).</i></font></p>     <blockquote>       <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><i>2.      Pacientes seleccionados para una RT hipo-fraccionada en el Cancer de Mama:</i></font></p> </blockquote>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Son pacientes    tambi&eacute;n mayores a 65 a&ntilde;os, con una tumorectom&iacute;a-curetaje    axilar, una irradiaci&oacute;n post-operatoria de 50 Gy en 5 semanas sobre el    conjunto de la gl&aacute;ndula mamaria (Vlastos 2001, Solin 1995). La &uacute;nica    contra con estos pacientes, es que su movilidad se encuentra a veces reducida,    no pudiendo cumplir el tratamiento <i>(Ballard-Barbash 1996, Hebert-Croteau    1999, Mandelblatt 2000).</i> Por tratar de mejorar esta terap&eacute;utica,    ya hay de trials en fase II, intentando el mejor esquema de hiperfraccionamiento,    y menos t&oacute;xico, posible <i>(Hannoun-Levi, Marsiglia 2003 in press).</i></font></p>     <blockquote>       <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><i>3.      Pacientes seleccionados (&gt;65a&ntilde;os, T1, N0, con Carcinoma exlcusivamente      infiltrante o canalicular, sin multifocalidad ni extensi&oacute;n intraductal),      para irradiaci&oacute;n parcial de mama</i></font></p> </blockquote>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">El concepto    de irradiaci&oacute;n parcial de mama se basa en hacer una irradiaci&oacute;n    hiperfraccionada de manera acelerada, dando una d&oacute;sis "biol&oacute;gicamente    equivalente" a 50 Gy en 5 sem. de irradiaci&oacute;n convencional, pero en un    tiempo m&aacute;s corto (entre 1 y 5 d&iacute;as). La radioterapia externa perioperatoria    (IORT) (Veronesi 2001, Vaidya 2001), y la curiterapia a bajo d&eacute;bito de    d&oacute;sis (LDR) (Vicini 1999-2001, King 2000, Krishnan 2001) o alto d&eacute;bito    de d&oacute;sis (HDR) (Vicini 2002, Wazer 2002, Polgar 2002) fueron el objeto    de numerosos estudios en fase II, con resultados satisfactorios en el plano    est&eacute;tico y en el control local optimal.</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Muchos trials    en fase III estan en curso para poner en evidencia la ausencia de una diferencia    significativa entre control local e irradiaci&oacute;n parcial de mama y una    irradiaci&oacute;n convencional tomando en cuenta la totalidad de la gl&aacute;ndula    mamaria. Esta es una de las estrategias de elecci&oacute;n para las mujeres    de la tercera edad. Esta t&eacute;cnica todav&iacute;a, necesita ser evaluada    en terminos de falsabilidad y reproductibilidad en diferentes centros (Marsiglia    2003, <i>Bulletin du Cancer in press).</i> En el contexto de un protocolo, la    <i>Federation Nationale de Centres de Lutte Contre le Cancer</i> (FNCLCC, PAC    GERICO 03, Hannoun-Levi, Marsiglia) viene de estar aprobada, y las inclusiones    seran efectivas a partir del 2003: "Tratamiento radio-quir&uacute;rgico del    c&aacute;ncer de mama en la mujer mayor de 65 a&ntilde;os, sin invasi&oacute;n    ganglionar: estudios de fase II multic&eacute;ntrico de la falsabilidad y reproductividad    de una radioterapia concentrada y focalizada"(con un estudio m&eacute;dico-ec&oacute;nomico).</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="3"><b>VIII.    Conclusi&oacute;n</b></font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">Existen    numerosos estudios hechos a lo largo de los &uacute;ltimos 20 a&ntilde;os, que    demuestran la eficacia de la Radioterapia adyuvante en mama, en comparaci&oacute;n    con la cirug&iacute;a como terapia &uacute;nica. La tasa de recidiva local de    la asociaci&oacute;n radio-cirug&iacute;a puede bajar un 30% el riesgo relativo    de recidiva loco-regional. Este efecto ben&eacute;fico se ha mantenido a lo    largo del tiempo, como lo muestran los &uacute;ltimos trials randomizados, y    los meta-an&aacute;lisis publicados entre 1995 y 2000. Aunque no haya sido estudiada    directamente la sobrevida global, podemos insinuar a partir de las conclusiones    de los &uacute;ltimos meta-an&aacute;lisis, una prolongaci&oacute;n de la sobrevida    por c&aacute;ncer. Por otra parte, el aumento potencial a largo plazo de muerte    por enfermedad intercurrente (sobre todo las cardiovasculares) nos lleva a efectuar    t&eacute;cnicas rigurosas que no sobreexpongan al paciente a una toxicidad card&iacute;aca    o pulmonar. Las nuevas t&eacute;cnicas de irradiaci&oacute;n en curso de evaluaci&oacute;n,    que incluyen la intensidad modulada, y la simulaci&oacute;n por TAC, permitir&aacute;n    mejorar a&uacute;n m&aacute;s los resultados terap&eacute;uticos. Por &uacute;ltimo,    acompa&ntilde;ando estas innovaciones t&eacute;cnicas, las estrategias terap&eacute;uticas    que tienden a irradiar exclusivamente el lecho tumoral (irradiaci&oacute;n parcial    de mama) se estan comenzando a utilizar con mucho &eacute;xito, continuando    el panorama prometedor, para este tipo de patolog&iacute;a.</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">&nbsp;</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="3"><b>Bibliograf&iacute;a</b></font></p>     <!-- ref --><p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">1. Arriagada    R, Le MG, Rochard F, Contesso. Conservative treatment versus mastectomy in early    breast cancer: patterns of failure with 15 years of follow-up data. Institut    Gustave-Roussy Breast Cancer Group. 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