<?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>0798-0469</journal-id>
<journal-title><![CDATA[Revista de la Facultad de Medicina]]></journal-title>
<abbrev-journal-title><![CDATA[RFM]]></abbrev-journal-title>
<issn>0798-0469</issn>
<publisher>
<publisher-name><![CDATA[Universidad Central de Venezuela. Facultad de Medicina. Comisión de Publicaciones de la Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0798-04692008000200010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Rol de la linfadenectomía en el manejo quirúrgico del cáncer de mama]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aponte-Rueda]]></surname>
<given-names><![CDATA[María Eugenia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cárdenas A]]></surname>
<given-names><![CDATA[Ramón Saade]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Central de Venezuela Facultad de Medicina Escuela Luis Razetti]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<volume>31</volume>
<numero>2</numero>
<fpage>133</fpage>
<lpage>137</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0798-04692008000200010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0798-04692008000200010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0798-04692008000200010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La linfadenectomía axilar ha sido siempre un componente tanto de la mastectomía como de la cirugía conservadora de mama, al proveer el estadiaje axilar, así como un control local efectivo, no sin potenciales efectos colaterales. El estado de los ganglios linfáticos axilares es una variable pronóstica significante y permanece como el más potente predictor de recurrencia y supervivencia. Sin embargo, recientemente se debate sobre el interés del potencial rol terapéutico de la terapia local agresiva para el cáncer de mama. Pocos tópicos han permanecido con controversias tan duraderas como el manejo de los ganglios linfáticos axilares en el cáncer de mama, parece que hemos pasado de una época en que la linfadenectomía axilar se consideraba indispensable a otra en la que para algunos autores parece innecesaria. En el momento actual a pesar de más de un siglo de debate nos seguimos preguntando acerca de la posibilidad que la cirugía axilar tenga un beneficio en la supervivencia de los pacientes con cáncer de mama. El siguiente trabajo nos permitirá evidenciar el rol de la linfadenectomía axilar, particularmente a la luz de los ensayos clínicos en curso.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Axillary node dissection has always been a component both of mastectomy and breast conservative surgery, providing accurate axillary staging as well as effective regional control, not without potential side effects. Axillary lymph node status is a significant prognostic pathologic variable and remains the most powerful predictor of recurrence and survival. However, recently it debates about the interest in the potential therapeutic role of aggressive local therapy of breast cancer. Few topics have remained as durably controversial as the management of the axillary lymph node dissection in breast cancer, it seems that we have been past time the axillary lymphadenectomy was considered indispensable respect others for some authors. At this moment, despite a century of debate, we still are wondering about the possibility of a survival benefit of the axillary surgery. This study allows us to reflect about the role of axillary lymph node dissection, particularly at light on ongoing clinical trials.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cáncer de mama]]></kwd>
<kwd lng="es"><![CDATA[Linfadenectomía axilar]]></kwd>
<kwd lng="es"><![CDATA[Ensayos clínicos]]></kwd>
<kwd lng="en"><![CDATA[Breast cancer]]></kwd>
<kwd lng="en"><![CDATA[Axillary lymphadenectomy]]></kwd>
<kwd lng="en"><![CDATA[Clinical trials]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><b><span style="font-size: 12.0pt; font-family: Verdana">Rol  de la linfadenectomía en el manejo quirúrgico del cáncer de mama</span></b></p>     <p align="center"><font face="Verdana" size="2">María Eugenia Aponte-Rueda<sup>1</sup>,  Ramón Saade Cárdenas A<sup>2</sup></font></p>     <p align="justify"><font face="Verdana" size="2"><sup>1</sup> Médico Cirujano  especialista en Cirugía General. Profesor Contratado. Facultad de Medicina.  Escuela Luis Razetti. Cátedra de Clínica y Terapéutica Quirúrgica “A”. Servicio  de Cirugía-I. Instituto Autónomo Hospital Universitario de Caracas.</font></p>     <p align="justify"><font face="Verdana" size="2"><sup>2</sup> Médico Cirujano  especialista en Cirugía General. Profesor Instructor. Facultad de Medicina.  Escuela Luis Razetti. Cátedra de Clínica y Terapéutica Quirúrgica “C”. Servicio  de Cirugía-III. Instituto Autónomo Hospital Universitario de Caracas.</font></p>     <p align="justify"><font face="Verdana" size="2">e-mail: <a href="mailto:maruaponte@gmail.com">maruaponte@gmail.com</a></font></p>     <p align="justify"><font face="Verdana" size="2"><b>RESUMEN:</b> La  linfadenectomía axilar ha sido siempre un componente tanto de la mastectomía  como de la cirugía conservadora de mama, al proveer el estadiaje axilar, así  como un control local efectivo, no sin potenciales efectos colaterales. El  estado de los ganglios linfáticos axilares es una variable pronóstica  significante y permanece como el más potente predictor de recurrencia y  supervivencia. Sin embargo, recientemente se debate sobre el interés del  potencial rol terapéutico de la terapia local agresiva para el cáncer de mama.  Pocos tópicos han permanecido con controversias tan duraderas como el manejo de  los ganglios linfáticos axilares en el cáncer de mama, parece que hemos pasado  de una época en que la linfadenectomía axilar se consideraba indispensable a  otra en la que para algunos autores parece innecesaria. En el momento actual a  pesar de más de un siglo de debate nos seguimos preguntando acerca de la  posibilidad que la cirugía axilar tenga un beneficio en la supervivencia de los  pacientes con cáncer de mama. El siguiente trabajo nos permitirá evidenciar el  rol de la linfadenectomía axilar, particularmente a la luz de los ensayos  clínicos en curso.</font></p>     <p align="justify"><font face="Verdana" size="2"><b>Palabras clave:</b> Cáncer  de mama, Linfadenectomía axilar, Ensayos clínicos.</font></p>     <p align="justify"><font face="Verdana" size="2"><b>ABSTRACT:</b> Axillary node  dissection has always been a component both of mastectomy and breast  conservative surgery, providing accurate axillary staging as well as effective  regional control, not without potential side effects. Axillary lymph node status  is a significant prognostic pathologic variable and remains the most powerful  predictor of recurrence and survival. However, recently it debates about the  interest in the potential therapeutic role of aggressive local therapy of breast  cancer. Few topics have remained as durably controversial as the management of  the axillary lymph node dissection in breast cancer, it seems that we have been  past time the axillary lymphadenectomy was considered indispensable respect  others for some authors. At this moment, despite a century of debate, we still  are wondering about the possibility of a survival benefit of the axillary  surgery. This study allows us to reflect about the role of axillary lymph node  dissection, particularly at light on ongoing clinical trials.</font></p>     <p align="justify"><font face="Verdana" size="2"><b>Key words:</b> Breast cancer,  Axillary lymphadenectomy, Clinical trials.</font></p>     <p align="justify"><font face="Verdana" size="2">Recibido: 29-01-08.&nbsp;  Aceptado: 14-10-08.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2">La cirugía de mama, en general,  ha variado notablemente en las últimas décadas, debido a las diferencias en las  teorías expuestas respecto a la biología del tumor, ya que el cáncer de mama es  una enfermedad muy heterógenea con un enorme de rango de características  biológicas diferentes(1), para la cual la cirugía continúa siendo el tratamiento  más efectivo y para la cual la terapia adyuvante sistémica beneficia sólo a una  minoría de las tratadas(2).</font></p>     <p align="justify"><font face="Verdana" size="2">La disección axilar en  particular, a pesar de los más recientes avances en la investigación de  parámetros inmunohistoquímicos(3,4) y moleculares del cáncer, sigue siendo un  procedimiento de estadiaje(5-8) que es útil para el pronóstico(9-10),  mantenimiento del control local(7,11), así como establecer la extensión del  compromiso ganglionar lo cual permite la planificación de la dosis y tipo de  quimioterapia(12,13) o la radiación axilar(14,15).</font></p>     <p align="justify"><font face="Verdana" size="2">El concepto halstediano de  diseminación de las metástasis a los ganglios linfáticos desde el tumor primario  antes de su diseminación a distancia, establecía que los cánceres etiquetados  como operables, serían siempre una enfermedad locorregional, por lo que la  cirugía radical con excisión del tumor primario con márgenes de tejido normal  junto a los ganglios linfáticos regionales gobernaba el pensamiento quirúrgico  durante casi todo el siglo XX. La mastectomía radical, proporcionaba un buen  control locorregional, pero no prevenía la recurrencia sistémica en un  porcentaje significante de pacientes(16).</font></p>     <p align="justify"><font face="Verdana" size="2">La definición de la cirugía  axilar como una modalidad de estadiaje en vez de terapéutica, fue establecida  por Bernard Fisher, para quien la cirugía de la mama es como una enfermedad  sistémica, en la que el tumor en su diseminación no sigue un patrón ordenado,  sino que la células tumorales recorren los vasos linfáticos hasta los ganglios  que son barreras ineficaces contra dicha diseminación, existiendo además la  corriente sanguínea como vía importante. Todo ello hace que aquellos tumores que  inicialmente se consideraban como una enfermedad locorregional, son un proceso  sistémico que envuelve un complejo espectro de interacciones huésped-tumor y  variaciones en el tratamiento local poco afectan a la supervivencia(17), es  decir, pasamos de una época en que el vaciamiento axilar radical se consideraba  indispensable, a otra en que para algunos autores parece innecesaria, dado que  no tendría finalidad terapéutica y tampoco intervendría en la decisión, pues  todas las enfermas precisarían de un tratamiento general además del local; sin  embargo, un número de recientes observaciones clínicas han llevado a resurgir el  interés del rol terapéutico de la terapia local agresiva para el cáncer de  mama(18).</font></p>     <p align="justify"><font face="Verdana" size="2">Dado que el estatus ganglionar  es el más poderoso predictor de pronóstico y de supervivencia global en  pacientes con cáncer de mama, tiene sentido continuar realizando el  procedimiento de estadiaje axilar(5-8), sin embargo, la disección axilar puede  estar asociada con una significante morbilidad, incluyendo el linfedema  posoperatorio, la movilidad restringida, la neuropatía del brazo, seroma,  infección y otros problemas locales de la herida(11), por lo que la tendencia en  la cirugía del cáncer de mama es hacia procedimientos mínimamente invasivos. La  técnica de la biopsia del ganglio centinela facilita la identificación de  pacientes en quienes la disección axilar puede ser evitada(19,20), por lo que se  reduce la morbilidad posoperatoria(21), sin embargo, los pacientes con ganglio  centinela positivo, requerirán de la evaluación de su estado ganglionar(5).  Numerosos estudios han demostrado que el ganglio centinela predice correctamente  el estado de los otros ganglios axilares, el único ensayo clínico aleatorizado  que ha sido publicado es el ensayo de Milano, donde 516 mujeres con  cuadrantectomía más biopsia de ganglio centinela fueron aleatorizadas a  disección linfática axilar o disección linfática sólo si el ganglio centinela  era positivo(21). La seguridad y confiabilidad del procedimiento de ganglio  centinela será probada por el número de recurrencias axilares y la supervivencia  global luego de un seguimiento a largo plazo, sólo pocos estudios han sido  publicados, pero han reportado ninguna o mínima recurrencia(22-24) , durante el  seguimiento, en sólo 0,12 % de pacientes con ganglio centinela negativo(25). En  el ensayo de Milano(21) con un seguimiento de 46 meses, hubo 15 recurrencias de  cáncer de mama (ipsilateral o contralateral, ganglios regionales o metástasis a  distancia) en el grupo disección axilar, comparado con 10 eventos en el grupo de  ganglio centinela (P=0,26), dos mujeres murieron debido a cáncer de mama en el  grupo de disección axilar.</font></p>     <p align="justify"><font face="Verdana" size="2">A pesar de lo anterior, todavía  hoy permanece incierta si la disección axilar en pacientes ganglios negativos o  en pacientes ganglios positivos(26) afecta la supervivencia global o si  simplemente es un instrumento para alcanzar el control local. El desarrollo de  la recurrencia axilar ganglionar es un evento catastrófico para la paciente, la  recurrencia axilar entre las pacientes con ganglios clínicamente negativos en  quienes no se realiza la disección es del 20 %-25 % de estos(27), y en éstas en  promedio el 30 % de la recurrencia axilar se presenta como una enfermedad  regional incontrolable(28-30), lo cual es totalmente prevenible si se realiza la  disección axilar en pacientes con ganglio centinela positivo, ya que la tasa de  recurrencia local es menor del 2 %(31,32). El NSABP-04, el más influyente ensayo  clínico dirigido a esta cuestión, claramente establece que la disección axilar  es terápeutica sólo en eso de reducir la posibilidad de la subsecuente  recurrencia regional y eso no parece alterar la supervivencia del paciente(33).</font></p>     <p align="justify"><font face="Verdana" size="2">En el caso de los pacientes  ganglios negativos, la noción de remoción de los ganglios regionales está  fuertemente respaldada por estudios aleatorizados prospectivos y múltiples  estudios retrospectivos de gran número de mujeres(34-41). El metaanálisis  Bayesiano demuestra un 5,4 % de beneficio en la supervivencia en pacientes  tratadas con disección axilar profiláctica(42), este beneficio fue notado en  casi 3 000 pacientes durante aproximadamente cuatro décadas de pacientes  acumulados en seis ensayos clínicos aleatorizados: El ensayo de Copenhagen(43)  en Holanda, el ensayo del sur-este de Escocia en Inglaterra (SES)(44,45), dos  ensayos del Hospital Guy de Londres, Inglaterra (Guy I y Guy II),46-48 el NSABP-B0433  de Estados Unidos y el ensayo del Instituto Curie de Francia(32). A pesar de la  diferencia del diseño y en la población de pacientes, los seis ensayos mostraron  resultados similares con un incremento en la supervivencia desde 4 % hasta 16  %(42). Dentro de los argumentos en contra de este metaanálisis son los pocos  pacientes en estadio T1a y esencialmente, ninguna paciente en los seis ensayos  fue tratada con terapia adyuvante, en contraste con la práctica clínica  actual(15,49). En dos ensayos el tamaño medio del tumor no fue reportado; tres  ensayos reportaron un tamaño promedio superior a tres centímetros con ganglios  positivos en el 39 % al 54 % de las mujeres. Orr(37) reportó que era poco  probable que en cualquier mujer el tumor fuese reportado mamográficamente y que  el tratamiento adyuvante con quimioterapia o tamoxifeno habría sido raramente  usado al momento que el ensayo fue conducido.</font></p>     <p align="justify"><font face="Verdana" size="2">Los resultados a largo plazo de  dos(32,33) de los seis estudios han sido publicados: el estudio del Instituto  Curie(50) y el NSABP-04(30). En el estudio del Instituto Curie, la supervivencia  ha disminuido del 97 % y 93 % (P=0,014) a los 4,5 años a 76 % y 74 % (p=NS) a  los 15 años de seguimiento en el grupo de las disección axilar versus el grupo  de radioterapia. La falta de diferencia en la supervivencia libre de enfermedad  y metástasis es mantenida. La recurrencia en la axila es todavía menos frecuente  en el grupo de disección axilar (1 % y 3 %, p=0,04).</font></p>     <p align="justify"><font face="Verdana" size="2">En el NSABP B-04(30), a los 10  años de seguimiento demostró un 4 % de diferencia en la supervivencia a favor de  pacientes quienes tuvieron disección axilar pero sin significancia estadística,  a los 25 años de seguimiento no muestran diferencias en la supervivencia global  de la enfermedad entre los grupos con o sin disección axilar (25 % vs 26 %  respectivamente). Las tasas de supervivencia libre de enfermedad a distancia  fueron 46 % y 43 % respectivamente.</font></p>     <p align="justify"><font face="Verdana" size="2">Este beneficio en el aumento de  la supervivencia que se reporta cuando todos los ganglios linfáticos son  negativos, constituye aún una interrogante, por lo que en la actualidad se  espera por los resultados de ensayos clínicos importantes: NSABP-B32(51,52), el  ACOSOG-Z0011(53) y IBCSG 23-01(54) El NSABP B-32 es un ensayo clínico  aleatorizado que compara la disección axilar convencional a la biopsia del  ganglio centinela en pacientes con ganglios clínicamente negativos, el objetivo  de este ensayo es determinar si la remoción sólo del ganglio centinela  proporciona la supervivencia y el control local equivalente al de la disección  axilar mientras disminuye la magnitud de los efectos colaterales(51,52). El  ACOSOG-Z0011 es un estudio aleatorizado que compara la supervivencia global y  morbilidad de pacientes con ganglio centinela positivo a quien se le realiza la  disección axilar contra los que no van seguidos de disección axilar. El Grupo  Internacional de Estudio de Cáncer de Mama (IBCSG) 23-01 también compara la  efectividad de la disección axilar ganglionar en mujeres con ganglio centinela  positivo(54). De lo anterior podemos concluir que a pesar de un siglo de debate,  todavía nos preguntamos respecto al valor terapéutico de la disección ganglionar  axilar en cáncer de mama.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2">Pero aún más allá del valor  terapéutico de la disección axilar, actualmente se debate la necesidad de  disección axilar cuando el Ganglio Centinela es positivo, la disección axilar  según muchos no afecta la supervivencia global(55), se presume que aunque cerca  del 37 % de los pacientes tendrán metástasis ganglionares detectada por  histopatología(56), aproximadamente el 50 % de los pacientes sólo tienen un  ganglio positivo(57-59). Los pacientes con un solo ganglio centinela positivo,  generalmente reciben terapia adyuvante, a pesar de la ausencia de otras  metástasis ganglionar, la utilización de terapia sistémica es debida a la  probabilidad de diseminación metástasica a distancia, ya que el 36 % de todos  los pacientes con cáncer de mama tienen evidencia de células tumorales  epiteliales en su médula ósea, lo que incrementa el riesgo de muerte por cáncer  de mama(60). Actualmente se están identificando características histopatológicas  del tumor primario y del ganglio centinela positivo, que permitirán predecir el  estado de los ganglios no centinela(61-65). Hasta que tengamos los resultados de  estos ensayos, la disección axilar debe ser la regla no la excepción para  pacientes con ganglio centinela positivo(66).</font></p>     <p align="justify"><font face="Verdana" size="2"><b>REFERENCIAS</b></font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">1. Noguchi M, Taniya T. Biology  and surgical management of breast cancer. Breast Cancer. 2001;8(1):16-22.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1956618&pid=S0798-0469200800020001000001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="Verdana" size="2">2. 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