<?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>0187-5337</journal-id>
<journal-title><![CDATA[Perinatología y reproducción humana]]></journal-title>
<abbrev-journal-title><![CDATA[Perinatol. Reprod. Hum.]]></abbrev-journal-title>
<issn>0187-5337</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Perinatología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-53372013000200006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tumor phyllodes]]></article-title>
<article-title xml:lang="en"><![CDATA[Phyllodes tumours]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-López]]></surname>
<given-names><![CDATA[Josefina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Márquez-Acosta]]></surname>
<given-names><![CDATA[Gonzalo]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olaya Guzmán]]></surname>
<given-names><![CDATA[Emilio José]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Pue]]></surname>
<given-names><![CDATA[Daniella]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arteaga Gómez]]></surname>
<given-names><![CDATA[Ana Cristina]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Perinatología Isidro Espinosa de los Reyes Médico adscrito al Servicio de Oncología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Perinatología Isidro Espinosa de los Reyes Coordinador Servicio de Oncología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Instituto Nacional de Perinatología Isidro Espinosa de los Reyes Jefe del Servicio de Ginecología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2013</year>
</pub-date>
<volume>27</volume>
<numero>2</numero>
<fpage>106</fpage>
<lpage>112</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-53372013000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-53372013000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-53372013000200006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El tumor phyllodes es una neoplasia fibroepitelial rara; constituye el 0.3 al 0.9% de tumores de mama y 2-3% de los tumores fibroepiteliales de mama. Puede presentarse a cualquier edad y no hay características confiables para predecir su comportamiento clínico. Se deben evaluar varios parámetros, incluyendo la celularidad estromal, atipia, mitosis, crecimiento estromal excesivo, infiltración de bordes y presencia o ausencia de necrosis. La mayor parte de estos tumores son benignos, pero hasta 30% pueden presentar tejido conectivo maligno. Las metástasis generalmente son hematógenas más que linfáticas y se presentan en un 13% de los casos. La disección de ganglios axilares generalmente no se recomienda. El tumor phyllodes benigno y maligno recurre de manera local en el 25%, por lo que se recomienda el seguimiento de los casos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Phyllodes tumors is a rare fibroepithelial neoplasm; constitute about 0.3-0.9% of breast tumors and 2-3% of fibroepithelial breast tumors. They usually occur in middle-aged to elderly women but can occur at any age. No single feature is reliable to predict clinical behavior of phyllodes tumors. Several histological parameters should be evaluated, including stromal cellularity, atypia, mitoses, stromal overgrowth, infiltrative borders, and presence or absence of necrosis. Most of these tumors are benign, but up to 30% show malignant stroma. Metastases usually are hematogenous rather than lymphatic have been reported to occur at a rate of 13% as malignant phyllodes tumors usually spread by a hematogenous rather than a lymphatic route; axillary lymph node dissection is generally not recommended. The benign and malignant tumors phyllodes resort locally in 25% and follow up of patients is recomended.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Tumor]]></kwd>
<kwd lng="es"><![CDATA[phyllodes]]></kwd>
<kwd lng="en"><![CDATA[Phyllodes]]></kwd>
<kwd lng="en"><![CDATA[tumours]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culo de revisi&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Tumor <i> phyllodes</i> </b></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b><i> Phyllodes</i>  tumours</b></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Josefina Jim&eacute;nez-L&oacute;pez,&#42; Gonzalo M&aacute;rquez-Acosta,<sup>&Dagger;</sup> Emilio Jos&eacute;Olaya Guzm&aacute;n,&#42; Daniella G&oacute;mez-Pue,&#42; Ana Cristina Arteaga G&oacute;mez<sup>&sect;</sup></b></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">&#42; M&eacute;dico adscrito al Servicio de Oncolog&iacute;a.    <br><sup>&Dagger;</sup> Coordinador Servicio de Oncolog&iacute;a    ]]></body>
<body><![CDATA[<br><sup>&sect;</sup> Jefe del Servicio de Ginecolog&iacute;a.    <br>    <br>Instituto Nacional de Perinatolog&iacute;a Isidro Espinosa de los Reyes.</font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i> Correspondencia:</i>     <br><b>Dra. Josefina Jim&eacute;nez L&oacute;pez</b>    <br>Servicio de Oncolog&iacute;a    <br>Instituto Nacional de Perinatolog&iacute;a.    <br>Tel: 5312 7082    <br>E-mail: <a href="mailto:drajosefina@yahoo.com.mx" target="_blank">drajosefina@yahoo.com.mx</a></font></p>    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido: 03 de marzo de 2013    <br>Aceptado: 26 de marzo de 2013</font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>     <p align="justify"><font face="verdana" size="2">El tumor <i> phyllodes</i>  es una neoplasia fibroepitelial rara; constituye el 0.3 al 0.9% de tumores de mama y 2-3% de los tumores fibroepiteliales de mama. Puede presentarse a cualquier edad y no hay caracter&iacute;sticas confiables para predecir su comportamiento cl&iacute;nico. Se deben evaluar varios par&aacute;metros, incluyendo la celularidad estromal, atipia, mitosis, crecimiento estromal excesivo, infiltraci&oacute;n de bordes y presencia o ausencia de necrosis. La mayor parte de estos tumores son benignos, pero hasta 30% pueden presentar tejido conectivo maligno. Las met&aacute;stasis generalmente son hemat&oacute;genas m&aacute;s que linf&aacute;ticas y se presentan en un 13% de los casos. La disecci&oacute;n de ganglios axilares generalmente no se recomienda. El tumor <i> phyllodes </i> benigno y maligno recurre de manera local en el 25%, por lo que se recomienda el seguimiento de los casos.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Tumor, <i> phyllodes</i> .</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>     <p align="justify"><font face="verdana" size="2"><i> Phyllodes</i>  tumors is a rare fibroepithelial neoplasm; constitute about 0.3-0.9% of breast tumors and 2-3% of fibroepithelial breast tumors. They usually occur in middle-aged to elderly women but can occur at any age. No single feature is reliable to predict clinical behavior of phyllodes tumors. Several histological parameters should be evaluated, including stromal cellularity, atypia, mitoses, stromal overgrowth, infiltrative borders, and presence or absence of necrosis. Most of these tumors are benign, but up to 30% show malignant stroma. Metastases usually are hematogenous rather than lymphatic have been reported to occur at a rate of 13% as malignant <i> phyllodes</i>  tumors usually spread by a hematogenous rather than a lymphatic route; axillary lymph node dissection is generally not recommended. The benign and malignant tumors <i> phyllodes </i> resort locally in 25% and follow up of patients is recomended.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Key words:</b> <i> Phyllodes</i> , tumours.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>     <p align="justify"><font face="verdana" size="2">El c&aacute;ncer de mama afecta a una de cada nueve mujeres y es la segunda causa de muerte en relaci&oacute;n al c&aacute;ncer en la mujer. La mayor&iacute;a de estos casos corresponde a la estirpe epitelial y el m&aacute;s frecuente es el carcinoma ductal. Los tumores no-epiteliales son linfomas, sarcomas y melanomas. Uno de los tumores m&aacute;s raros es el <i> phyllodes</i> , que constituye menos del 1% de todos los tumores de mama y 2 a 3% de las neoplasias fibroepiteliales.<sup>1,2</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>DEFINICI&Oacute;N</b></font></p>     <p align="justify"><font face="verdana" size="2">Es un tumor bif&aacute;sico con un componente epitelial y tejido conectivo (con c&eacute;lulas en forma de uso y apariencia de hojas),<sup>3</sup> descrito por primera vez por Johannes M&uuml;ller en 1838.<sup>4</sup> En 1931 se describi&oacute; el primer caso de tumor <i> phyllodes</i>  metast&aacute;sico,<sup>5</sup> aunque la literatura en el pasado describe m&aacute;s de 62 diversas denominaciones para definir a este tumor.<sup>6</sup></font></p>     <p align="justify"><font face="verdana" size="2">En 1981, la Organizaci&oacute;n Mundial de la Salud adopt&oacute; el t&eacute;rmino de tumor <i> phyllodes</i>  y la subclasificaci&oacute;n como benignos, <i> borderline</i>  o malignos. Entre un 35 a 64% de los tumores <i> phyllodes</i>  son benignos y el resto subdividido en <i> borderline </i> y malignos.<sup>7,8</sup></font></p>     <p align="justify"><font face="verdana" size="2">El t&eacute;rmino tumor <i> phyllodes</i>  exhibe una amplia gama de comportamiento cl&iacute;nico y patol&oacute;gico; se debe considerar como un espectro entre las neoplasias fibroepiteliales, m&aacute;s que como una sola enfermedad.<sup>9</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>EPIDEMIOLOG&Iacute;A</b></font></p>     <p align="justify"><font face="verdana" size="2">El tumor <i> phyllodes</i>  es una lesi&oacute;n fibroepitelial rara que explica del 0.3 al 0.9% de los tumores de mama.<sup>1,10</sup> El &iacute;ndice de incidencia es de uno en 100,000 habitantes.<sup>11</sup></font></p>     <p align="justify"><font face="verdana" size="2">Se presenta generalmente en las mujeres entre 35 a 55 a&ntilde;os y su incidencia m&aacute;xima ocurre 10 a&ntilde;os m&aacute;s tarde que los fibroadenomas de mama.<sup>12,13 </sup>Sin embargo, el tumor <i> phyllodes</i>  puede ocurrir en los extremos de la vida; se han descrito casos a la edad de 10 a&ntilde;os y en la novena d&eacute;cada.<sup>14</sup> En el hombre tambi&eacute;n se han reportado algunos casos,<sup>15,16</sup> asociados a la presencia de ginecomastia.<sup>17</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las mujeres latinas tienen mayor riesgo de tumor <i> phyllodes</i>  que otros grupos &eacute;tnicos. Las mujeres nacidas en M&eacute;xico, Centroam&eacute;rica y Sudam&eacute;rica tienen tres veces mayor riesgo de padecerlo.<sup>12</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las investigaciones indican que no hay relaci&oacute;n entre el desarrollo del tumor <i> phyllodes</i>  y los estados premenop&aacute;usico o postmenop&aacute;usico, ni con el uso de anticonceptivos orales.<sup>18 </sup>Los tumores benignos son del 35 al 65% y los malignos entre el 15 y 35% de los casos. Tiene un riesgo total de malignidad de 2.1 por mill&oacute;n de mujeres.<sup>12</sup> Del 4 al 27% de los pacientes con tumores malignos desarrollan una enfermedad metast&aacute;sica; no obstante, la tasa de met&aacute;stasis total es menor al 5%.<sup>4,6</sup></font></p>     <p align="justify"><font face="verdana" size="2">El potencial maligno se determina por las caracter&iacute;sticas del tejido conectivo. La extensi&oacute;n metast&aacute;sica es principalmente hemat&oacute;gena a pulm&oacute;n, con implicaci&oacute;n linf&aacute;tica infrecuente.<sup>1,19</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">  <b>HISTOPATOLOG&Iacute;A</b></font></p>     <p align="justify"><font face="verdana" size="2">El tumor <i> phyllodes</i> , por su naturaleza, crece radialmente, comprime el par&eacute;nquima mamario y crea una pseudoc&aacute;psula a trav&eacute;s de la cual sobresalen leng&uuml;etas. El examen del tejido conectivo en secciones m&uacute;ltiples es obligatorio, ya que el <i> phyllodes</i>  maligno puede estar presente solamente en una porci&oacute;n del tumor.<sup>20 </sup>Estos tumores presentan un tama&ntilde;o de entre uno a 40 cm, con un promedio de 5 cm.<sup>21 </sup>El 73% de tumores <i> phyllodes</i>  benignos son menores a 5 cm, mientras que los mayores de 7 cm se relacionan con malignidad.<sup>22</sup></font></p>     <p align="justify"><font face="verdana" size="2">Macrosc&oacute;picamente, los tumores m&aacute;s peque&ntilde;os semejan fibroadenomas con un aspecto fibroso gris-blanco, mientras que los m&aacute;s grandes semejan sarcomas.<sup>21</sup> Tanto los tumores benignos como los malignos son descritos como lesiones firmes, grises y/o amarillas con &aacute;reas gelatinosas enquistadas.<sup>22</sup> La superficie al corte es mucoide, con &aacute;reas fibrosas que se alternan con &aacute;reas carnosas suaves y algunas veces con quistes llenos de l&iacute;quido.<sup>23</sup> Se considera que el tumor <i> phyllodes</i>  puede ser derivado de fibroblastos intralobulares de la mama, mientras que otros opiniones se inclinan a la preexistencia de fibroadenoma.<sup>22,23</sup></font></p>     <p align="justify"><font face="verdana" size="2">Microsc&oacute;picamente, el epitelio se compone de c&eacute;lulas epiteliales m&aacute;s que de c&eacute;lulas mioepiteliales y puede tambi&eacute;n presentar cambios hiperpl&aacute;sicos y displ&aacute;sicos. El epitelio cuboidal al&iacute;nea los peque&ntilde;os canales que aparecen como espacios ductales. Las salientes papilares alineadas del tejido fino conectivo estromal se extienden en &aacute;reas enquistadas que forman estructuras con caracter&iacute;sticas de hoja.<sup>21</sup> El tumor de <i> phyllodes</i>  histol&oacute;gicamente se asemeja a elementos epiteliales y del mesenquima de un fibroadenoma, pero se diferencia por el potencial de crecimiento y celularidad del estroma.<sup>22,24</sup> Sin embargo, se ha observado que los fragmentos del estroma hipercelular tambi&eacute;n aparecen en fibroadenomas, as&iacute; que no puede utilizarse esta condici&oacute;n como criterio &uacute;nico para el diagn&oacute;stico.<sup>25</sup></font></p>     <p align="justify"><font face="verdana" size="2">La presencia de elementos epiteliales y estromales es necesaria para confirmar el diagn&oacute;stico. El componente neopl&aacute;sico del tejido conectivo determina el diagn&oacute;stico y las c&eacute;lulas estromales determinan el potencial metast&aacute;sico.<sup>26</sup></font></p>     <p align="justify"><font face="verdana" size="2">La diferenciaci&oacute;n sarcomatosa es extremadamente rara; de 1979 hasta el momento se han reportado 30 casos; el tipo histol&oacute;gico m&aacute;s com&uacute;n es el liposarcoma y s&oacute;lo se ha reportado un caso de rabdomiosarcoma y otro de leiomiosarcoma.<sup>27</sup></font></p>     <p align="justify"><font face="verdana" size="2">De acuerdo a los criterios propuestos por Azopardi, el tumor <i> phyllodes</i>  se clasifica en tres grupos, a saber: benigno, <i> borderline</i>  y maligno, y tiene como base los siguientes par&aacute;metros:</font></p>     <p align="justify"><font face="verdana" size="2">1.	M&aacute;rgenes del tumor. Un margen bien delimitado de forma microsc&oacute;pica se ha considerado como buen indicador pron&oacute;stico. Los m&aacute;rgenes infiltrantes se asocian con frecuencia a un alto &iacute;ndice mit&oacute;tico y se correlacionan con alto riesgo de recurrencia tumoral.</font></p>     <p align="justify"><font face="verdana" size="2">2.	Crecimiento de tejido conectivo. El tumor <i> phyllodes</i>  puede demostrar &aacute;reas de diferenciaci&oacute;n sarcomatosa. La celularidad del tejido conectivo es muy alta en tumores malignos y <i> borderline</i> .</font></p>     <p align="justify"><font face="verdana" size="2">3.	Mitosis. En tumores benignos, con cero a cuatro mitosis por 10 campos. Potencialmente malignos, con cinco a nueve mitosis por 10 campos y malignos con 10 o m&aacute;s mitosis.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">4.	Atipia celular. La atipia celular severa se relaciona con tumores malignos.<sup>4-7,9</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>CUADRO CL&Iacute;NICO</b></font></p>     <p align="justify"><font face="verdana" size="2">Los pacientes presentan, t&iacute;picamente, un tumor de mama, en ocasiones doloroso, liso, m&oacute;vil y bordes circunscritos. El tumor presenta crecimiento progresivo lento, pero puede tambi&eacute;n aumentar r&aacute;pidamente de tama&ntilde;o. Esto puede dar lugar a piel brillante, la cual llega a ser transl&uacute;cida, con presencia de una red venosa como resultado de la distensi&oacute;n y de la presi&oacute;n creciente; las ulceraciones atenuadas de la piel son secundarias a la isquemia.<sup>9</sup></font></p>     <p align="justify"><font face="verdana" size="2">Sin embargo, se ha observado que el dolor, la retracci&oacute;n del pez&oacute;n y la fijaci&oacute;n de la piel ocurren en tumores benignos as&iacute; como en malignos, de modo que los s&iacute;ntomas no indican necesariamente la naturaleza del tumor.<sup>22</sup></font></p>     <p align="justify"><font face="verdana" size="2">Se ha reportado fijaci&oacute;n a la piel o a los m&uacute;sculos del pectoral pero la ulceraci&oacute;n es infrecuente, incluso en pacientes con necrosis.<sup>28</sup> Las linfadenopat&iacute;as axilares palpables se pueden identificar en el 20% de pacientes pero las met&aacute;stasis ganglionares son infrecuentes.<sup>29</sup> Existe una proporci&oacute;n significativa de pacientes que han tenido previamente un fibroadenoma.<sup>16,30,31</sup></font></p>     <p align="justify"><font face="verdana" size="2">El tumor de <i> phyllodes</i>  se encuentra m&aacute;s com&uacute;nmente en la mama derecha, siendo bilateral en una tercera parte de los casos.<sup>5,19</sup> El 35% de los tumores se localiza en el cuadrante superior externo, 15% en el superior interno, del 10 al 25% en el inferior externo y menos del 10% en el cuadrante inferior interno<sup>22</sup> En el 35% de los pacientes se presenta de forma multic&eacute;ntrica.<sup>9</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">  <b>DIAGN&Oacute;STICO</b></font></p>     <p align="justify"><font face="verdana" size="2">Un problema importante de diagn&oacute;stico que implica el tumor <i> phyllodes</i>  es que la biopsia por aspiraci&oacute;n con aguja fina, mamograf&iacute;a y los estudios del ultrasonido no son capaces de distinguir entre fibroadenoma y tumor <i> phyllodes</i> .<sup>1</sup> El fibroadenoma y el tumor <i> phyllodes</i>  muestran, mamogr&aacute;ficamente, masas bien definidas con bordes lisos o lobulados y presencia de un halo radiol&uacute;cido alrededor de la lesi&oacute;n debido a la compresi&oacute;n del estroma mamario.<sup>32</sup> El diagn&oacute;stico definitivo ocurre s&oacute;lo en un tercio de los estudios mamogr&aacute;ficos.<sup>1,33</sup></font></p>     <p align="justify"><font face="verdana" size="2">En el ultrasonido, los tumores <i> phyllodes</i>  demuestran a menudo contornos lisos con ecos internos homog&eacute;neos, quistes intramurales y ausencia de reforzamiento ac&uacute;stico posterior.<sup>34</sup> Se ha observado una masa hipoec&oacute;ica con un patr&oacute;n ecogr&aacute;fico heterog&eacute;neo, necrosis dentro del tumor y distorsi&oacute;n de la arquitectura de la mama. La necrosis dentro del tumor es la caracter&iacute;stica principal del tumor <i> phyllodes</i>  maligno; no obstante, la confirmaci&oacute;n histopatol&oacute;gica es obligatoria.<sup>35</sup></font></p>     <p align="justify"><font face="verdana" size="2">En la biopsia por aspiraci&oacute;n con aguja fina, los tumores benignos se caracterizan por la mezcla de c&eacute;lulas estromales y epiteliales, adem&aacute;s de celularidad moderada y pleom&oacute;rfico ausente. El tumor <i> phyllodes</i>  <i> borderline</i>  presenta fragmentos estromales con celularidad moderada, c&eacute;lulas estromales, pleomorfismo moderado y mitosis ocasionales. Los tumores malignos se han encontrado con marcada celularidad estromal, un alto cociente estromal/epitelial, mitosis frecuentes, c&eacute;lulas estromales anormales y un pleomorfismo m&aacute;s alto.<sup>36</sup> Se ha demostrado que la aspiraci&oacute;n con aguja fina no es diagn&oacute;stica<sup>1</sup> y es dif&iacute;cil de distinguir entre un tumor <i> phyllodes</i>  y un fibroadenoma.<sup>37,38</sup> La presencia de componentes celulares bif&aacute;sicos es imprescindible para el diagn&oacute;stico.<sup>39</sup> La tasa alta de falsos negativos se debe a la presencia de racimos de c&eacute;lulas epiteliales y a la presencia limitada de c&eacute;lulas sarcomatosas aisladas, f&aacute;cilmente evidentes. Por otra parte, un n&uacute;mero de c&eacute;lulas epiteliales con una morfolog&iacute;a aprocrina y la presencia de n&uacute;cleos bipolares dificultan el diagn&oacute;stico.<sup>38,39</sup></font></p>     <p align="justify"><font face="verdana" size="2">La biopsia por aspiraci&oacute;n con aguja fina diagn&oacute;stica se realiza en s&oacute;lo el 70% de los tumores <i> phyllodes</i> <sup>6 </sup>y tiene una tasa de falsos-negativos cercana al 40%. La biopsia con aguja Trucut se considera un m&eacute;todo altamente exacto para descartar malignidad con una sensibilidad de los aproximadamente 95 a 97%;<sup>40</sup> por ello, y para evitar errores de diagn&oacute;stico, se recomienda la biopsia con aguja Trucut.<sup>6,40</sup></font></p>     <p align="justify"><font face="verdana" size="2">Algunos autores se&ntilde;alan que el estudio transoperatorio no es recomendable, ya que la diferenciaci&oacute;n entre tumor <i> phyllodes</i>  benigno y fibroadenoma es dif&iacute;cil. Adem&aacute;s, los elementos sarcomatosos se pueden confundir con un carcinoma indiferenciado conduciendo a un tratamiento radical innecesario; es importante, primero, obtener una biopsia adecuada, con especial atenci&oacute;n a la morfolog&iacute;a de los n&uacute;cleos en el estroma.<sup>5</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>TRATAMIENTO</b></font></p>     <p align="justify"><font face="verdana" size="2">Se recomienda una biopsia excisional apropiada con por lo menos m&aacute;rgenes de 2 cm, si el diagn&oacute;stico se sospecha o se ha confirmado despu&eacute;s de la biopsia de base. La excisi&oacute;n local amplia con m&aacute;rgenes de 2 cm es la opci&oacute;n principal para tumores peque&ntilde;os. Se sugiere mastectom&iacute;a total para los tumores mayores de 5 cm o tumores malignos, aunque se debe considerar la relaci&oacute;n entre el tama&ntilde;o de la lesi&oacute;n y el tama&ntilde;o de la mama. No est&aacute; indicada la disecci&oacute;n de ganglios regionales.<sup>1,5,11</sup> La primera meta del tratamiento es alcanzar los m&aacute;rgenes negativos.<sup>41</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La mastectom&iacute;a no es el tratamiento de primera opci&oacute;n para los tumores <i> phyllodes</i>  malignos cuando es factible una adecuada resecci&oacute;n con m&aacute;rgenes libres. La recurrencia local puede ser tratada con escisi&oacute;n local adicional o mastectom&iacute;a.<sup>1,6,42</sup></font></p>     <p align="justify"><font face="verdana" size="2">El retiro de la fascia del pectoral o el m&uacute;sculo no se indica rutinariamente a menos que este tejido est&eacute;implicado. Si la escisi&oacute;n inicial del tumor no tiene el margen &gt; 1 cm, se recomienda hacer una reescisi&oacute;n para obtener un margen adecuado y prevenir recurrencia local. En el caso de recurrencia local, se recomienda la reescisi&oacute;n con m&aacute;rgenes &gt; 2-3 cm.<sup>11</sup></font></p>     <p align="justify"><font face="verdana" size="2">En la mayor&iacute;a de casos, la escisi&oacute;n amplia con m&aacute;rgenes adecuados puede ser alcanzada sin mastectom&iacute;a. La mastectom&iacute;a total (sin disecci&oacute;n de ganglios axilares) est&aacute; reservada para las lesiones demasiado grandes donde se pueda alcanzar un margen de 1 cm sin deformar la mama, o para las recurrencias locales recidivantes, a pesar de m&aacute;rgenes adecuados.<sup>4</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las met&aacute;stasis a ganglios linf&aacute;ticos axilares se presentan en menos de 5% de pacientes; por lo tanto, no se recomienda la extirpaci&oacute;n de cadenas ganglionares regionales, a menos que el estudio transoperatorio revele la presencia de tumor.<sup>4,11 </sup>Debido a los componentes variables del tumor <i> phyllodes</i> , es posible que en algunos casos los ganglios linf&aacute;ticos axilares est&eacute;n afectados, pero la disecci&oacute;n axilar debe ser reservada para los casos con implicaci&oacute;n cl&iacute;nica evidente.<sup>6</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Radioterapia</b></font></p>     <p align="justify"><font face="verdana" size="2">El papel de la radioterapia en el tratamiento de los tumores <i> phyllodes</i>  es incierto, aunque puede ser &uacute;til en casos seleccionados.<sup>1</sup> Su uso est&aacute; indicado en casos de enfermedad recurrente regional y met&aacute;stasis sintom&aacute;ticas.<sup>43</sup></font></p>     <p align="justify"><font face="verdana" size="2">Adem&aacute;s, se ha utilizado radioterapia como adyuvante en tumores mayores de 5 cm, porque disminuye la recurrencia local y mejora la supervivencia.<sup>21,42</sup></font></p>     <p align="justify"><font face="verdana" size="2">Se recomienda la radioterapia externa adyuvante para los tumores <i> phyllodes</i>  <i> bordeline</i>  y malignos, cuando se ha utilizado tratamiento conservador o mastectom&iacute;a en donde el riesgo de recurrencia es alto en tumores mayores de 10 cm, con m&aacute;rgenes inciertos o menores de 0.5 cm y en casos recurrente. La necesidad de radioterapia en tumores benignos debe ser considerada en m&aacute;rgenes menores de 0.5 cm o en m&aacute;rgenes positivos despu&eacute;s de la mastectomia o cirug&iacute;a conservadora.<sup>42,43</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Quimioterapia</b></font></p>     <p align="justify"><font face="verdana" size="2">El papel de la quimioterapia en el tratamiento primario y adyuvante no est&aacute; definido; si acaso se puede utilizar como tratamiento paliativo. La ifosfamida sola o en combinaci&oacute;n con doxorrubicina o cisplatino pueden prolongar la sobrevivencia y retrasar el progreso de met&aacute;stasis en casos de tumor <i> phyllodes</i>  de alto grado.<sup>7,11</sup></font></p>     <p align="justify"><font face="verdana" size="2">Hasta el 40% de tumores <i> phyllodes</i>  tienen receptores hormonales a estr&oacute;genos; sin embargo, no se ha demostrado el papel de la terapia hormonal.<sup>11,44</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>FACTORES PRON&Oacute;STICOS</b></font></p>     <p align="justify"><font face="verdana" size="2">La utilidad de marcadores como predictores del comportamiento en tumores <i> phyllodes</i>  ya ha sido estudiada; sin embargo, tanto una predisposici&oacute;n gen&eacute;tica como el grado histol&oacute;gico no han podido predecir la recurrencia o las met&aacute;stasis.<sup>20,45</sup> La citometr&iacute;a de flujo y la actividad de telomerasa se han descrito como factores predictores de recurrencia.<sup>46</sup></font></p>     <p align="justify"><font face="verdana" size="2">No s&oacute;lo los par&aacute;metros microsc&oacute;picos se han correlacionado con el pron&oacute;stico; diversos estudios sugieren que tumores con aneuploid&iacute;a son cl&iacute;nicamente agresivos.<sup>7</sup> La aneuploid&iacute;a del ADN ha sido se&ntilde;alada como predictor de recurrencia, por tener una fracci&oacute;n m&aacute;s alta de fase-S.<sup>15</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La expresi&oacute;n del factor inductor de hipoxia (HIF-1&alpha;) est&aacute; asociado a la supervivencia y al per&iacute;odo libre de enfermedad, y desempe&ntilde;a un papel importante en la progresi&oacute;n estromal del tumor <i> phyllodes</i> . La transici&oacute;n de los tumores <i> borderline</i>  a tumores <i> phyllodes</i>  malignos se ha relacionado con un aumento en la expresi&oacute;n estromal de p53, similar a la expresi&oacute;n estromal de HIF-1&alpha;.<sup>47</sup> Tambi&eacute;n la expresi&oacute;n de p53 se puede asociar a las caracter&iacute;sticas histol&oacute;gicas de malignidad pero no predice el comportamiento maligno.<sup>48</sup></font></p>     <p align="justify"><font face="verdana" size="2">El gen 1q est&aacute; implicado en la progresi&oacute;n del c&aacute;ncer de origen epitelial y mesenquimatoso; el aumento de 1q es un indicador para el tratamiento radical del tumor <i> phyllodes</i> .<sup>49</sup></font></p>     <p align="justify"><font face="verdana" size="2">La edad, la duraci&oacute;n de los s&iacute;ntomas, el tama&ntilde;o del tumor, la nuliparidad, ulceraci&oacute;n de la piel y el dolor no tienen valor pron&oacute;stico. El factor pron&oacute;stico m&aacute;s confiable es la presencia del crecimiento estromal excesivo, el cual influye en la presencia de met&aacute;stasis.<sup>7</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>PRON&Oacute;STICO</b></font></p>     <p align="justify"><font face="verdana" size="2">El crecimiento excesivo estromal es el factor m&aacute;s significativo para el desarrollo de met&aacute;stasis sist&eacute;mica. Algunos autores se&ntilde;alan que el tama&ntilde;o del tumor, la necrosis, la celularidad marcada y las c&eacute;lulas pleom&oacute;rficas corroboran el diagn&oacute;stico de malignidad.<sup>11,42,50</sup></font></p>     <p align="justify"><font face="verdana" size="2">En la mayor&iacute;a de casos, los ganglios axilares no son palpables. Una raz&oacute;n es que la extensi&oacute;n metast&aacute;tica de estos tumores es por v&iacute;a hemat&oacute;gena. Entre el 10 y 15% de los pacientes desarrollar&aacute;n adenopat&iacute;a axilar, pero &eacute;sta generalmente corresponde a una hiperplasia reactiva de un tumor infectado o necr&oacute;tico, m&aacute;s que a met&aacute;stasis.<sup>1</sup> Las met&aacute;stasis m&aacute;s frecuentes afectan pulm&oacute;n, pleura y huesos.<sup>19</sup> Del 3 al 12% de pacientes mueren debido a recurrencia local o secundaria a met&aacute;stasis a distancia.<sup>21</sup> Las met&aacute;stasis aparecen en un lapso de cinco a&ntilde;os posterior al diagn&oacute;stico.<sup>51</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los tumores <i> phyllodes</i>  benignos y malignos recurren localmente en el 25% y teniendo esta &uacute;ltima variante el potencial de met&aacute;stasis principalmente por v&iacute;a hemat&oacute;gena.<sup>1</sup></font></p>     <p align="justify"><font face="verdana" size="2">La probabilidad de recurrencia por histolog&iacute;a sigue siendo indeterminada. Los datos demuestran que gran parte de los tumores mayores de 10 cm tienen un &iacute;ndice de recurrencia siete veces mayor, mientras los m&aacute;rgenes positivos un riesgo cuatro veces mayor de recurrencia.<sup>19</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La recurrencia ocurre los dos primeros a&ntilde;os con intervalo medio de 32 meses para tumores benignos y de 22 para tumores malignos.<sup>21</sup> El 10% de pacientes con tumor <i> phyllodes</i>  desarrollan met&aacute;stasis distantes y &eacute;stos ocurren en aproximadamente 20% de pacientes con histolog&iacute;a maligna; la mayor&iacute;a de las met&aacute;stasis distantes se presentan sin evidencia de recurrencia local.<sup>52,53</sup></font></p>     <p align="justify"><font face="verdana" size="2">Tambi&eacute;n se ha demostrado que hay una correlaci&oacute;n entre la mortalidad y el tama&ntilde;o y grado histol&oacute;gico del tumor.<sup>54,55</sup> La tasa de supervivencia a cinco a&ntilde;os es del 90%.<sup>18</sup> Todos los tumores <i> phyllodes</i>  pueden recurrir, sin importar su histolog&iacute;a.<sup>6</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>SEGUIMIENTO</b></font></p>     <p align="justify"><font face="verdana" size="2">Se indica examen semestral de mama, en conjunto con ultrasonido mamario y seg&uacute;n sea la edad, tambi&eacute;n mastograf&iacute;a. Otros estudios de imagen como la tomograf&iacute;a o la resonancia magn&eacute;tica se solicitan seg&uacute;n sea la evoluci&oacute;n cl&iacute;nica de la paciente.<sup>11</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>CONCLUSI&Oacute;N</b></font></p>     <p align="justify"><font face="verdana" size="2">En el tumor <i> phyllodes</i>  el pron&oacute;stico est&aacute; determinado por la biolog&iacute;a del tumor y los m&aacute;rgenes adecuados de resecci&oacute;n, este &uacute;ltimo como factor pron&oacute;stico m&aacute;s importante de recurrencia. Las recurrencias locales no parecen afectar la supervivencia; por consiguiente, la resecci&oacute;n amplia debe ser el tratamiento primario, asociado a una vigilancia estrecha y permanente.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2"><b>REFERENCIAS</b></font></p>    <!-- ref --><p align="justify"><font face="verdana" size="2">1.	Rowell MD, Perry RR, Hsiu JG, Barranco SC. Phyllodes Tumors. Am J Surgery. 1993; 165: 376-9.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024788&pid=S0187-5337201300020000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">2.	Guray M, Sahin A. Benign breast diseases: classification, diagnosis, and management. The Oncologist. 2006; 11: 435-49.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024790&pid=S0187-5337201300020000600002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">3.	Chen W, Cheng S, Tzen C, Yang T, Jeng K, Liu C et al. Surgical treatment of phyllodes tumors of the breast: retrospective review of 172 cases. J Surg Oncol. 2005; 91: 185-94.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024792&pid=S0187-5337201300020000600003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">4.	August D, Kearney T. Cystosarcoma phyllodes: mastectomy, lumpectomy, or lumpectomy plus irradiation. Surgical Oncology. 2000; 9: 49-52.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024794&pid=S0187-5337201300020000600004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">5.	Guerrero M, Ballard B, Grau A. Malignant phyllodes tumor of the breast review of the literature: and case report of stromal overgrowth. Surgical Oncology. 2003; 12: 27-37.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024796&pid=S0187-5337201300020000600005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">6.	Salvadori B, Cusumano F, Del Bo R, Delledonne V, Grassi M, Rovini D. Surgical treatment of phyllodes tumors of the breast. Cancer. 1989; 63: 2532-6.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024798&pid=S0187-5337201300020000600006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">7.	Reinfus M, Mitus J, Duda K, Stelmach A, Rys J, Smolak K. The treatment and prognosis of patients with phyllodes tumor of the breast. Cancer. 1996; 77: 910-6.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024800&pid=S0187-5337201300020000600007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">8.	World Health Organization. Histologic typing of breast tumors, vol. 2. 2<sup>nd</sup> ed. Geneve Switzerland: Healt Organization; 1981: 22.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024802&pid=S0187-5337201300020000600008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">9.	Parker S, Harries S. Phyllodes tumours. Review. Postgrad Med J. 2001; 77: 428-35.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024804&pid=S0187-5337201300020000600009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">15.	Keelan P, Myers J, Wold L, Katzmann J. Phyllodes tumours: clinicopathologic review of 60 patients and floor citometric analysis in 30 patients. Hum Pathol. 1992; 23: 1048-54.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024816&pid=S0187-5337201300020000600015&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">16.	Rajan P, Cranor M, Rosen P. Cystosarcoma phyllodes in adolescent girls, young women. Am J Surg Pathol. 1998; 229: 64-9.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024818&pid=S0187-5337201300020000600016&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">17.	Pantoja E, Llobert R, Lopez E. Gigant cystosarcoma phyllodes in a man with gynecomastia. Arch Surg. 1976; 111: 611-9.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024820&pid=S0187-5337201300020000600017&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">18.	Lindquist KD, van Heerden JA, Weiland LH, Martin JK. Recurrent and metastatic cystosarcoma phyllodes. Am J Surg. 1982; 144: 341-3.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024822&pid=S0187-5337201300020000600018&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">19.	Kapiris I, Nasiri N, A'Hern R, Healy V. Outcome and predictive factors local recurrence and distant metastases following primary surgical treatment of high-grade malignant phyllodes tumours of the breast. EJSO. 2001; 27: 723-30.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024824&pid=S0187-5337201300020000600019&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">55.	Hawkins R, Sckofield J, Wiltskaw E, Fisher C, Mckinna J. Ifosfamide is an active drug for chemotherapy of metastatic cystosarcoma phyllodes. Cancer. 1992: 69: 2271-5.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6024896&pid=S0187-5337201300020000600055&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">      <br> <b>Nota</b>     <br>           <br> Este art&iacute;culo puede ser consultado en versi&oacute;n completa en: <a href="http://www.medigraphic.com/inper" target="_blank">http://<b>www.medigraphic.com/inper</b></a></font></p>       ]]></body><back>
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