<?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>S0378-48352004000800002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[La Tomografía por Emisión de Positrones (PET) en la práctica clínica oncológica]]></article-title>
<article-title xml:lang="en"><![CDATA[Positron emission tomography (PET) in oncological clinical practice]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez Fernández]]></surname>
<given-names><![CDATA[J. P.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maldonado Suárez]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Domínguez Grande]]></surname>
<given-names><![CDATA[M. L.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Serna Macías]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kostvinseva]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ordovás Oromendía]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castell]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martín]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gorospe]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alfonso Alfonso]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro PET Complutense  ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital Universitario Central de Asturias Servicio de Medicina Nuclear ]]></institution>
<addr-line><![CDATA[Oviedo ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Hospital Angeles del Pedregal  ]]></institution>
<addr-line><![CDATA[México D.F. ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2004</year>
</pub-date>
<volume>27</volume>
<numero>8</numero>
<fpage>15</fpage>
<lpage>25</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0378-48352004000800002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0378-48352004000800002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0378-48352004000800002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La Tomografía por Emisión de Positrones con 18F-fluorodeoxiglucosa (PET-FDG) es una técnica de diagnóstico por imagen cuyo uso se ha generalizado en España durante la última década. Existen una serie de indicaciones concretas, en las cuales la PET-FDG ha demostrado sobradamente su superioridad con respecto a los métodos convencionales de diagnóstico. Es recomendable, por ello, realizar un estudio PET-FDG únicamente en las siguientes situaciones: la estadificación de tumores pulmonares y linfomas, la re-estadificación de tumores de tiroides, colorrectales, de cabeza-cuello, linfomas y melanomas; la localización de tumores de origen desconocido; la caracterización del nódulo pulmonar solitario; y, por último, el diagnóstico diferencial recidiva/radionecrosis en tumores cerebrales.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Positron emission tomography with 18F-fluorodeoxyglucose (FDG-PET) is a diagnostic procedure which has been progressively incorporated to clinical practice in Spain during the last decade. There are several indications in which FDG-PET has demonstrated a better diagnostic accuracy when compared with conventional methods. In order to optimize the use of this new technique, it is recommendable to select those situationts where FDG-PET has shown to be clearly better than the conventional techniques, as staging of lung cancer and lymphoma; restaging of thyroid cancer, colorectal cancer, head and neck cancer, lymphoma and melanoma; localization of unknown primary site carcinomas; diagnosis of solitary pulmonary nodules; and differentiation of tumor recurrence from radionecrosis in brain tumors.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Tomografía por Emisión de Positrones (PET)]]></kwd>
<kwd lng="es"><![CDATA[18FDG]]></kwd>
<kwd lng="es"><![CDATA[Oncología]]></kwd>
<kwd lng="en"><![CDATA[Positron emission tomography]]></kwd>
<kwd lng="en"><![CDATA[PET]]></kwd>
<kwd lng="en"><![CDATA[FDG-PET]]></kwd>
<kwd lng="en"><![CDATA[5FUDG]]></kwd>
<kwd lng="en"><![CDATA[Oncology]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><b><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2">REVISI&Oacute;N</font></b></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="4"><b><a name="top10"></a>La    Tomograf&iacute;a por Emisi&oacute;n de Positrones (PET) en la pr&aacute;ctica    cl&iacute;nica oncol&oacute;gica</b></font></p>     <p>&nbsp;</p>     <p><b><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="3">Positron    emission tomography (PET) in oncological clinical</font></b></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>&nbsp;</b></font></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>J. P. Su&aacute;rez    Fern&aacute;ndez<sup>I</sup>; A. Maldonado Su&aacute;rez<sup>I</sup>; M. L.    Dom&iacute;nguez Grande<sup>II</sup>; J. A. Serna Mac&iacute;as<sup>IV</sup>;    </b></font><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>O.    Kostvinseva<sup>I</sup>; A. Ordov&aacute;s Oromend&iacute;a<sup>I</sup>; E.    Castell<sup>I</sup>; C. Mart&iacute;n<sup>I</sup>; E. Gorospe<sup>I</sup>; J.    M. Alfonso Alfonso<sup>I</sup></b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <sup>I</sup>Centro    PET Complutense (Madrid)</font>    <br>   <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><sup>II</sup>Servicio    de Medicina Nuclear. Hospital Universitario Central de Asturias (Oviedo)</font>    ]]></body>
<body><![CDATA[<br>   <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><sup>III</sup>Hospital    Angeles del Pedregal. M&eacute;xico D.F. (M&eacute;xico)</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><a href="#back10">Direcci&oacute;n    para correspondencia</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1" noshade>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>RESUMEN</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La    Tomograf&iacute;a por Emisi&oacute;n de Positrones con 18F-fluorodeoxiglucosa    (PET-FDG) es una t&eacute;cnica de diagn&oacute;stico por imagen cuyo uso se    ha generalizado en Espa&ntilde;a durante la &uacute;ltima d&eacute;cada. Existen    una serie de indicaciones concretas, en las cuales la PET-FDG ha demostrado    sobradamente su superioridad con respecto a los m&eacute;todos convencionales    de diagn&oacute;stico. Es recomendable, por ello, realizar un estudio PET-FDG    &uacute;nicamente en las siguientes situaciones: la estadificaci&oacute;n de    tumores pulmonares y linfomas, la re-estadificaci&oacute;n de tumores de tiroides,    colorrectales, de cabeza-cuello, linfomas y melanomas; la localizaci&oacute;n    de tumores de origen desconocido; la caracterizaci&oacute;n del n&oacute;dulo    pulmonar solitario; y, por &uacute;ltimo, el diagn&oacute;stico diferencial    recidiva/radionecrosis en tumores cerebrales.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Palabras clave:    </b>Tomograf&iacute;a por Emisi&oacute;n de Positrones (PET). 18FDG. Oncolog&iacute;a.</font><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>&nbsp;</b></font></p> <hr size="1" noshade>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="2"><b>SUMMARY</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Positron    emission tomography with 18F-fluorodeoxyglucose (FDG-PET) is a diagnostic procedure    which has been progressively incorporated to clinical practice in Spain during    the last decade. There are several indications in which FDG-PET has demonstrated    a better diagnostic accuracy when compared with conventional methods. In order    to optimize the use of this new technique, it is recommendable to select those    situationts where FDG-PET has shown to be clearly better than the conventional    techniques, as staging of lung cancer and lymphoma; restaging of thyroid cancer,    colorectal cancer, head and neck cancer, lymphoma and melanoma; localization    of unknown primary site carcinomas; diagnosis of solitary pulmonary nodules;    and differentiation of tumor recurrence from radionecrosis in brain tumors.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Key words: </b>Positron    emission tomography. PET. FDG-PET. 5FUDG. Oncology.</font></p> <hr size="1" noshade>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="3"><b>Introducci&oacute;n</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La tomograf&iacute;a    por emisi&oacute;n de positrones (PET) es una t&eacute;cnica de Medicina Nuclear    que permite obtener im&aacute;genes de la distribuci&oacute;n <i>in vivo</i>    de diferentes mol&eacute;culas. Es lo que se ha denominado la "imagen molecular",    complemento de la informaci&oacute;n anat&oacute;mica que proporcionan la tomograf&iacute;a    axial computerizada (TAC) o la resonancia magn&eacute;tica (RM). Esto se consigue    mediante la administraci&oacute;n intravenosa de un radiof&aacute;rmaco, que    es la uni&oacute;n de un is&oacute;topo radioactivo con una mol&eacute;cula    determinada, tras lo cual se realiza la adquisici&oacute;n de las im&aacute;genes    en una c&aacute;mara PET.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En la pr&aacute;ctica    cl&iacute;nica diaria, la mol&eacute;cula que se utiliza es la fluorodesoxiglucosa    (FDG) que va unida al <sup>18</sup>F, is&oacute;topo radioactivo emisor de positrones    de per&iacute;odo de semidesintegraci&oacute;n muy corto (110 minutos). La FDG    es un an&aacute;logo de la glucosa y es captada tanto por las c&eacute;lulas    normales como por las cancer&iacute;genas, pero no sigue el ciclo bioqu&iacute;mico    normal de la glucosa, por lo que queda atrapado en su interior. De forma fisiol&oacute;gica,    algunos tejidos como el cerebro, el miocardio o el h&iacute;gado tienen una    alta demanda de glucosa, lo que se va a traducir en una alta retenci&oacute;n    de FDG (<a href="#fig1">Fig. 1</a>). En el caso de las c&eacute;lulas malignas,    su alta tasa metab&oacute;lica implica igualmente una gran avidez por la FDG,    cuyo paso al interior celular est&aacute; adem&aacute;s muy potenciado, lo que    permite <i>a priori</i> diferenciar los tejidos malignos de los benignos.</font></p>     <p align="center"><a name="fig1"></a></p>     <p align="center">&nbsp;</p>     <p align="center"><img src="/img/onco/v27n8/02f1.jpg"></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">No obstante, la    imagen obtenida tiene limitaciones en cuanto a la detecci&oacute;n de la enfermedad    de muy bajo grado de malignidad, debido precisamente a una menor avidez por    la glucosa; del mismo modo, tambi&eacute;n puede mostrar zonas de elevada actividad    celular de causa benigna, como la inflamaci&oacute;n o la infecci&oacute;n,    que ser&aacute;n causas potenciales de falsos positivos. Adem&aacute;s, aunque    las c&aacute;maras PET poseen una aceptable resoluci&oacute;n espacial (4-5    mm), cabe se&ntilde;alar que la imagen obtenida no ser&aacute; capaz de detectar    la enfermedad microsc&oacute;pica.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La PET es una t&eacute;cnica    de imagen que surge en la d&eacute;cada de los 70 en Estados Unidos, implant&aacute;ndose    en la pr&aacute;ctica cl&iacute;nica diaria durante la d&eacute;cada de los    90. La PET fue introducida en Espa&ntilde;a en 1995 (Centro PET Complutense,    Madrid). En la actualidad hay cerca de 30 centros PET distribuidos por toda    la geograf&iacute;a espa&ntilde;ola. Desde el a&ntilde;o 2000, los hospitales    p&uacute;blicos de las diferentes comunidades aut&oacute;nomas est&aacute;n    incorporando esta tecnolog&iacute;a a la bater&iacute;a de pruebas diagn&oacute;sticas    existentes. La <sup>18</sup>F-FDG es el radiof&aacute;rmaco que ha permitido    la introducci&oacute;n de la t&eacute;cnica PET a nivel hospitalario, a pesar    de que existen en la actualidad cerca de 3.000 radiof&aacute;rmacos sintetizados;    de aqu&iacute; en adelante, se sobreentender&aacute; al referirnos a la PET    como a aquella realizada con <sup>18</sup>F-FDG (PET-FDG).</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La Oncolog&iacute;a    es la principal indicaci&oacute;n cl&iacute;nica de la PET-FDG (m&aacute;s del    90% de las indicaciones). Debido a su capacidad de poder visualizar lesiones    malignas de moderado-alto grado, la PET-FDG es de gran utilidad en las neoplasias    malignas de mayor incidencia en la poblaci&oacute;n, tales como las de pulm&oacute;n,    mama, colon, linfomas, cabeza y cuello o melanoma. Dado que estamos analizando    el metabolismo de las c&eacute;lulas cancer&iacute;genas, su detecci&oacute;n    ser&aacute; m&aacute;s precoz que las alteraciones morfol&oacute;gicas, par&aacute;metro    utilizado por la TAC o la RM. Adem&aacute;s, se podr&aacute;n evaluar tambi&eacute;n    de forma m&aacute;s precoz los efectos de los tratamientos tanto quimio como    radioter&aacute;picos, en comparaci&oacute;n con esas t&eacute;cnicas convencionales.    La falta de definici&oacute;n anat&oacute;mica de la PET est&aacute; siendo    paliada con los nuevos equipos h&iacute;bridos PET-TAC. Estosn proporcionan    al especialista una visi&oacute;n completa de la enfermedad, especialmente cuando    se planifiquen procedimientos quir&uacute;rgicos.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El Ministerio de    Sanidad y Consumo ha sometido a Uso Tutelado 9 indicaciones PET-FDG en Oncolog&iacute;a    desde 2002, que detallaremos a continuaci&oacute;n.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&nbsp;</font></p>     <p><font face="Verdana, Arial, Helvetica-Normal, sans-serif" size="3"><b>Indicaciones    cl&iacute;nicas de la PET en Oncolog&iacute;a</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En Espa&ntilde;a    se autoriza la realizaci&oacute;n de estudios PET-FDG en determinadas situaciones    cl&iacute;nicas (<a href="/img/onco/v27n8/02t1.gif">Tabla I</a>), recogidas en el Protocolo    de Uso Tutelado de mayo de 2002<sup>1, 2</sup>, como paso previo a su inclusi&oacute;n    en las prestaciones del Sistema Nacional de Salud.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Tumores del    sistema nervioso central</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En el tratamiento    de los tumores del sistema nervioso central se han introducido t&eacute;cnicas    tales como la radioterapia intersticial, la braquiterapia y la radiocirug&iacute;a    estereot&aacute;xica, que permiten una mayor supervivencia de los pacientes.    Como contrapartida, existe una mayor incidencia de da&ntilde;o cerebral post-radioterapia,    que se suele producir en un 50% de los casos tras radiocirug&iacute;a y en un    65% tras radioterapia intersticial. Transcurrido un cierto per&iacute;odo de    tiempo, el paciente puede experimentar nuevamente s&iacute;ntomas que dependen    de las secuelas de la terapia o bien de una recidiva, siendo en muchas ocasiones    dif&iacute;cil diferenciar una causa de otra, lo que dificulta la conducta terap&eacute;utica    que se debe seguir. Las t&eacute;cnicas de imagen anat&oacute;micas o funcionales    (TAC, RM, SPECT) son poco espec&iacute;ficas en dicho diagn&oacute;stico diferencial.    La sensibilidad de la PET-FDG en esta situaci&oacute;n cl&iacute;nica var&iacute;a,    seg&uacute;n los trabajos y protocolos empleados, del 73 al 100%. La especificidad    del PET-FDG es del 56 al 100% y los valores predictivos positivos y negativos    son 80 y 46%, respectivamente. Comparada con la RM la PET resulta ser superior,    tanto en la detecci&oacute;n de recidiva/restos tumorales como en la encefalopat&iacute;a    post-tratamiento<sup>3-7</sup>. El m&aacute;ximo rendimiento se obtiene con    la imagen de fusi&oacute;n PET-RM.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Actualmente, el    criterio de indicaci&oacute;n de la PET-FDG en los tumores del SNC es<sup>1,    2</sup>:</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; Pacientes    con gliomas grados I y II que presenten s&iacute;ntomas compresivos y/o irritativos,    con RM con contraste que no discrimine entre recidiva tumoral y secuelas post-tratamiento    (radionecrosis o cicatrices).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>C&aacute;ncer    de cabeza y cuello</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La supervivencia    del tumor de cabeza y cuello (60%) no ha variado desde el advenimiento de la    terapia combinada (cirug&iacute;a+radioterapia) a causa de las met&aacute;stasis    y de los segundos tumores primarios. Detectar r&aacute;pidamente las recurrencias    bajar&iacute;a la mortalidad. La PET-FDG es m&aacute;s segura para el diagn&oacute;stico    diferencial entre recurrencia tumoral y cambios fibr&oacute;ticos y/o necr&oacute;ticos    post-tratamiento que la TAC o RM, teniendo un importante papel en la detecci&oacute;n    precoz de dichas recurrencias y en la detecci&oacute;n de segundos tumores primarios.    La PET-FDG puede resultar tambi&eacute;n &uacute;til para determinar el lugar    m&aacute;s adecuado para realizar la biopsia. En ocasiones, nos encontramos    ante met&aacute;stasis ganglionares cervicales de tumor de origen desconocido    a pesar de un completo estudio de extensi&oacute;n. En estos casos la PET-FDG    presenta una capacidad diagn&oacute;stica superior a otras t&eacute;cnicas.    Por &uacute;ltimo, en la monitorizaci&oacute;n del tratamiento la PET-FDG muestra    una mayor especificidad que las t&eacute;cnicas morfoestructurales, diferenciando    los pacientes que responden al tratamiento y los que no responden, en los que    permitir&aacute; modificar la pauta terap&eacute;utica de forma precoz<sup>8-17</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Actualmente, el    criterio de indicaci&oacute;n de la PET en el c&aacute;ncer de cabeza y cuello    es<sup>1, 2</sup>:</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; Pacientes    con sospecha de recurrencia, tras la realizaci&oacute;n de todas las pruebas    diagn&oacute;sticas convencionales, susceptibles de cirug&iacute;a radical.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>C&aacute;ncer    de tiroides</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Una mayor capacidad    diagn&oacute;stica de la PET-FDG frente a las dem&aacute;s t&eacute;cnicas convencionales    es el diagn&oacute;stico de recurrencia locorregional, ganglionar regional y    a distancia del carcinoma diferenciado de tiroides cuando el rastreo con <sup>131</sup>I    es negativo, y resulta de mayor valor cuando las cifras de Tiroglobulina (Tg)    se encuentran elevadas y cuando el paciente est&aacute; bajo terapia sustitutiva.    La PET-FDG resulta superior en la detecci&oacute;n de recurrencias ganglionares    cervicales a las dem&aacute;s t&eacute;cnicas de imagen que basan su diagn&oacute;stico    en el tama&ntilde;o de la lesi&oacute;n. La PET-FDG ha demostrado la existencia    de met&aacute;stasis en ganglios de tama&ntilde;o normal y en un 45% de pacientes    sin elevaci&oacute;n de Tg. Los resultados de la PET-FDG en estos pacientes    implican cambios en el manejo terap&eacute;utico de los mismos, llev&aacute;ndoles    en determinados casos a cirug&iacute;as con intenci&oacute;n curativa<sup>18-24</sup>.    Por otro lado, el hecho de realizar la PET-FDG con estimulaci&oacute;n, preferentemente    ex&oacute;gena de la TSH, puede producir un incremento de su rendimiento diagn&oacute;stico.    Tambi&eacute;n es de gran utilidad en el carcinoma medular ante elevaci&oacute;n    progresiva de la calcitonina en sangre.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Actualmente, los    criterios de indicaci&oacute;n de la PET en el c&aacute;ncer de tiroides son<sup>1,2</sup>:</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; Pacientes    en seguimiento tras un diagn&oacute;stico y tratamiento iniciales de un c&aacute;ncer    diferenciado de tiroides con sospecha de recurrencia o met&aacute;stasis susceptibles    de tratamiento (aumento de la tiroglobulina con rastreos con <sup>131</sup>I    negativos), tras la realizaci&oacute;n de todas las pruebas diagn&oacute;sticas    convencionales.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; Pacientes    diagnosticados y tratados previamente de un carcinoma medular de tiroides con    calcitonina alta y pruebas de imagen negativas o indeterminadas con el objeto    de identificar restos de tejido tiroideo susceptibles de ser resecados quir&uacute;rgicamente.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>C&aacute;ncer    de pulm&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El carcinoma broncog&eacute;nico    representa el 95% de los tumores primarios pulmonares, siendo la primera causa    de mortalidad por c&aacute;ncer. El 75% de ellos son carcinomas no microc&iacute;ticos,    en los que es posible, al ser localizados, realizar una resecci&oacute;n potencialmente    curativa. La detecci&oacute;n en los ganglios linf&aacute;ticos de la afectaci&oacute;n    carcinomatosa es problem&aacute;tica con el TAC, ya que el resultado de este    m&eacute;todo parece normal en algunos casos en que existe afectaci&oacute;n    metast&aacute;sica de los mismos y anormal en ganglios no malignos que simplemente    han aumentado de tama&ntilde;o. En el diagn&oacute;stico de tumor primario de    &gt;2 cm, la PET-FDG presenta igual sensibilidad que la SPECT con <sup>201</sup>Tl,    <sup>99m</sup>Tc-MIBI o <sup>99m</sup>Tc-Tetrofosm&iacute;n, pero para lesiones    de menor tama&ntilde;o es claramente superior la PET-FDG. La PET es superior    a la TAC y al SPECT con MIBI o Tetrofosm&iacute;n en la detecci&oacute;n de    ganglios mediast&iacute;nicos afectados por el c&aacute;ncer de pulm&oacute;n    y mejora la estadificaci&oacute;n N cuando se asocian PET y TAC. El alto valor    predictivo de esta t&eacute;cnica permite evitar procedimientos agresivos diagn&oacute;sticos    como la mediastinoscopia, reduciendo, por tanto, los costes diagn&oacute;sticos    y evit&aacute;ndole as&iacute; al paciente la morbilidad asociada a los mismos    (<a href="#fig2">Fig. 2</a>). La PET-FDG detecta met&aacute;stasis extrator&aacute;cicas    no sospechadas por otras t&eacute;cnicas, lo que supone un cambio en la estadificaci&oacute;n    tumoral en un considerable porcentaje de pacientes, descartando en ellos la    resecci&oacute;n quir&uacute;rgica como tratamiento curativo y evitando cirug&iacute;as    innecesarias. En la detecci&oacute;n de met&aacute;stasis &oacute;seas, la PET-FDG    presenta la ventaja a&ntilde;adida de ser m&aacute;s espec&iacute;fica y presentar    un mayor valor predictivo positivo que la gammagraf&iacute;a &oacute;sea. Tambi&eacute;n    resulta m&aacute;s adecuada que la TAC para predecir la respuesta a la quimioterapia    de inducci&oacute;n tanto del tumor como a nivel ganglionar, por lo que se puede    considerar como buena t&eacute;cnica para seleccionar los pacientes que se beneficiar&aacute;n    de un tratamiento locorregional con intenci&oacute;n curativa<sup>25-35</sup>.</font></p>     <p align="center"><a name="fig2"></a></p>     <p align="center">&nbsp;</p>     <p align="center"><img src="/img/onco/v27n8/02f2.jpg"></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Actualmente, los    criterios de indicaci&oacute;n de la PET en el c&aacute;ncer de pulm&oacute;n    son<sup>1, 2</sup>:</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; Pacientes    con c&aacute;ncer de pulm&oacute;n no microc&iacute;tico, tras la realizaci&oacute;n    de todas las pruebas diagn&oacute;sticas convencionales de estadificaci&oacute;n,    con el fin de establecer la extensi&oacute;n y tasa de progresi&oacute;n de    la enfermedad para realizar cirug&iacute;a radical.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; No se realizar&aacute;    PET con la indicaci&oacute;n de re-estadificaci&oacute;n.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>N&oacute;dulo    pulmonar solitario</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Un n&oacute;dulo    pulmonar solitario (NPS) es una lesi&oacute;n &uacute;nica esf&eacute;rica dentro    del pulm&oacute;n que no est&aacute; asociada a agrandamiento hiliar o atelectasia    y cuyo tama&ntilde;o es generalmente menor de 4 cm de di&aacute;metro. Cuando    son malignos representan aproximadamente el 15% de los tumores malignos pulmonares.    La mitad de los NPS suelen ser benignos (el 80% de ellos son granulomas). Cuando    resultan ser malignos suelen ser carcinomas broncog&eacute;nicos que se consideran    en estadio I de la clasificaci&oacute;n TNM, siendo potencialmente curables    mediante la resecci&oacute;n. Entre el 10 y el 20% de los NPS malignos son metast&aacute;sicos    de origen extrapulmonar. El prop&oacute;sito primario de la caracterizaci&oacute;n    de los n&oacute;dulos pulmonares solitarios es determinar la verosimilitud de    la malignidad de tales n&oacute;dulos con el objetivo de planificar el tratamiento.    El m&eacute;todo radiol&oacute;gico diagn&oacute;stico est&aacute;ndar utilizado    ha sido el TAC y, aunque se han empleado modalidades nuevas de TAC como la que    utiliza contraste yodado o bien el TAC con densitometr&iacute;a de alta resoluci&oacute;n    (HRCT), no se ha conseguido evitar las limitaciones diagn&oacute;sticas de esta    t&eacute;cnica (clasifica como indeterminados muchos NPS). Lo mismo ha ocurrido    empleando la RM. La sensibilidad de la PET-FDG en esta situaci&oacute;n cl&iacute;nica    es del 93 al 100% y la especificidad del 78 al 88%, con una exactitud diagn&oacute;stica    del 92 al 94%. La PET ha demostrado tener gran capacidad para diferenciar entre    los de car&aacute;cter benigno y maligno (<a href="#fig3">Fig. 3</a>). Estos    valores mejoran cuando no se incluyen pacientes con procesos infecciosos-inflamatorios    activos como tuberculosis o granulomas, cuando el tama&ntilde;o del NPS es &gt;1,5    cm, y tambi&eacute;n puede mejorar la diferenciaci&oacute;n benigno/ maligno    si se realiza estudio semicuantitativo calculando el SUV (standard uptake value    o valor est&aacute;ndar de captaci&oacute;n). Cuando un NPS se informa como    maligno en una PET, la probabilidad de malignidad es muy alta y cuando la PET    es normal, la probabilidad de que un NPS sea maligno es muy baja adem&aacute;s    de tener un gran valor predictivo negativo. En diferentes estudios se ha descrito    la influencia de la PET en el manejo terap&eacute;utico de los pacientes, en    unos casos al evitar otros procedimientos diagn&oacute;sticos invasivos, y en    otros por evitar cirug&iacute;as al detectar met&aacute;stasis ganglionares    y/o a distancia no sospechadas previamente<sup>36-40</sup>.</font></p>     ]]></body>
<body><![CDATA[<p align="center"><a name="fig3"></a></p>     <p align="center">&nbsp;</p>     <p align="center"><img src="/img/onco/v27n8/02f3.jpg"></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Actualmente, los    criterios de indicaci&oacute;n de la PET en NPS son<sup>1, 2</sup>:</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; Pacientes    con NPS &lt;4 cm, radiol&oacute;gicamente indeterminado por TAC. Se exigir&aacute;    exploraci&oacute;n f&iacute;sica y anal&iacute;tica completas.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; No se realizar&aacute;    PET como prueba de cribado poblacional ni en pacientes con diagn&oacute;stico    previo de c&aacute;ncer reciente.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>C&aacute;ncer    colorrectal</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En el adenocarcinoma    colorrectal son comunes las met&aacute;stasis y la recurrencia tras resecci&oacute;n    quir&uacute;rgica con intenci&oacute;n curativa del tumor primario. La utilidad    cl&iacute;nica de la PET-FDG consiste en su relativa capacidad de predecir si    la intervenci&oacute;n quir&uacute;rgica ser&aacute; efectiva en el tratamiento    del paciente. La sospecha de dicha recurrencia puede estar basada en datos cl&iacute;nicos,    de imagen o por elevaci&oacute;n de marcadores y la PET-FDG podr&iacute;a ayudar    a contrastar esa sospecha. Por otro lado, la detecci&oacute;n de las met&aacute;stasis    extrahep&aacute;ticas es importante ya que evitar&iacute;a cirug&iacute;a innecesaria.    La mayor&iacute;a de los trabajos analizan la capacidad de la PET-FDG en la    re-estadificaci&oacute;n tumoral (<a href="#fig4">Fig. 4</a>), cuando despu&eacute;s    de haber sido intervenido el paciente del tumor primario colorrectal se presenta    sospecha de recurrencia local o a distancia, fundamentalmente a nivel hep&aacute;tico,    que es el lugar de m&aacute;s frecuente diseminaci&oacute;n. Tanto para la estadificaci&oacute;n    en general como para el diagn&oacute;stico de recurrencia locorregional, de    met&aacute;stasis hep&aacute;ticas y de otras met&aacute;stasis a distancia,    la PET-FDG presenta valores diagn&oacute;sticos superiores a los dem&aacute;s    medios de diagn&oacute;stico convencionales, y en concreto frente a la TAC,    que es la t&eacute;cnica m&aacute;s habitual. Los resultados de la PET-FDG conducen    a un cambio en la actitud terap&eacute;utica en un alto porcentaje de pacientes    (22-68%), en unos casos evitando la cirug&iacute;a cuando la PET detecta enfermedad    irresecable (18-50% casos); por ejemplo, al detectar m&aacute;s lesiones hep&aacute;ticas    en casos en los que se supon&iacute;a una &uacute;nica, o al detectar lesiones    a distancia no sospechadas modificando la estadificaci&oacute;n tumoral, o,    por el contrario, al indicar una cirug&iacute;a con intenci&oacute;n curativa    (10-28% casos). Las cirug&iacute;as innecesarias evitadas por la PET-FDG podr&iacute;an    dar lugar a una reducci&oacute;n en los costes de tratamiento, adem&aacute;s    de reducir la morbilidad asociada y mejorar la calidad de vida de los pacientes.    La PET-FDG puede valorar la respuesta del c&aacute;ncer rectal al tratamiento    neoadyuvante: permite detectar dicha respuesta en el 100% de los casos frente    al 78% de la TAC, seg&uacute;n recientes estudios. Igualmente, se objetiva una    mayor supervivencia libre de enfermedad en los pacientes estadificados mediante    PET, lo que se relacion&oacute; con una mejor selecci&oacute;n de pacientes    que se beneficiar&aacute;n de la cirug&iacute;a. En otros casos, la PET-FDG    permite guiar la biopsia disminuyendo el n&uacute;mero de biopsias negativas<sup>41-55</sup>.</font></p>     <p align="center"><a name="fig4"></a></p>     ]]></body>
<body><![CDATA[<p align="center">&nbsp;</p>     <p align="center"><img src="/img/onco/v27n8/02f4.jpg"></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Actualmente, los    criterios de indicaci&oacute;n de la PET en c&aacute;ncer colorrectal son<sup>1,    2</sup>:</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; Pacientes    con sospecha cl&iacute;nica, radiol&oacute;gica o anal&iacute;tica de recurrencia    tras la realizaci&oacute;n de todas las pruebas diagn&oacute;sticas convencionales,    susceptibles de cirug&iacute;a radical.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; No se realizar&aacute;    PET con fines de estadificaci&oacute;n o valoraci&oacute;n del tumor primario,    ni en caso de ausencia de elevaci&oacute;n de marcadores tumorales o en caso    de no haberse realizado colonoscopia o TAC, si procede.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Linfomas</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La efectividad    de la PET-FDG en esta patolog&iacute;a consiste en su capacidad de determinar    la malignidad o benignidad de las lesiones encontradas y si el tratamiento aplicado    va siendo eficaz para el paciente, por lo cual la PET-FDG (<a href="#fig5">Fig.    5</a>) se utiliza tambi&eacute;n en la re-estadificaci&oacute;n de estos enfermos    tras los ciclos de tratamiento o quimioterapia. Existen dos indicaciones cl&iacute;nicas    en las que la PET ha demostrado gran capacidad diagn&oacute;stica:</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">1) Valoraci&oacute;n    de tejido viable tumoral en masa residual detectada por TAC tras tratamiento,    con sensibilidad comparable o superior a la TAC, pero con una especificidad    muy superior a &eacute;sta, con significaci&oacute;n estad&iacute;stica, permitiendo    valorar con gran exactitud la presencia de tejido viable donde la TAC presenta    resultados equ&iacute;vocos. En este sentido, la PET-FDG juega un papel en el    manejo terap&eacute;utico de pacientes con linfomas al identificar aquellos    que requieren tratamiento adicional. Se ha comprobado una supervivencia libre    de enfermedad significativamente superior en pacientes con PET-FDG negativas,    lo que implica que la PET-FDG tiene mayor valor tanto diagn&oacute;stico como    pron&oacute;stico que la TAC.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">2) En la estadificaci&oacute;n    inicial y re-estadificaci&oacute;n, para valorar afectaci&oacute;n ganglionar    y extraganglionar e infiltraci&oacute;n de m&eacute;dula &oacute;sea, sus par&aacute;metros    son superiores a la TAC, siendo especialmente &uacute;til en los linfomas de    alto grado de agresividad. La PET-FDG permite detectar las mismas lesiones que    la TAC pero, adem&aacute;s, detecta otras que no hab&iacute;an sido sospechadas    con otras t&eacute;cnicas diagn&oacute;sticas (en un 16-48% de pacientes), lo    que conduce a un cambio en la estadificaci&oacute;n que se traduce, en muchos    casos, en cambios en la estrategia terap&eacute;utica en un n&uacute;mero considerable    de pacientes. Al tener similares resultados que la biopsia de m&eacute;dula    &oacute;sea, la PET-FDG podr&iacute;a utilizarse en sustituci&oacute;n de esta    t&eacute;cnica invasiva, que, por otro lado, presenta en algunos casos falsos    negativos. En otros casos la PET-FDG servir&iacute;a de gu&iacute;a para indicar    el lugar m&aacute;s favorable a biopsiar y reducir el n&uacute;mero de biopsias    negativas<sup>56-68</sup>.</font></p>     ]]></body>
<body><![CDATA[<p align="center"><a name="fig5"></a></p>     <p align="center">&nbsp;</p>     <p align="center"><img src="/img/onco/v27n8/02f5.jpg"></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Actualmente, los    criterios de indicaci&oacute;n de la PET en los linfomas son<sup>1, 2</sup>:</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; Pacientes    con evidencia histol&oacute;gica de linfoma maligno (Hodgkin y no Hodgkin),    en fase de estadificaci&oacute;n, tras realizar pruebas convencionales.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; Pacientes    con masa residual tras terapia de linfoma maligno.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Tumores primarios    de origen desconocido</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En ocasiones, el    diagn&oacute;stico de c&aacute;ncer parte del hallazgo de marcadores tumorales    s&eacute;ricos elevados o por detecci&oacute;n de met&aacute;stasis regionales    o a distancia, siendo los m&eacute;todos diagn&oacute;sticos convencionales    no concluyentes. Es evidente que los marcadores tumorales cuando est&aacute;n    elevados indican con m&aacute;s especificidad que la PET-FDG que existe un tumor    activo, aunque estos marcadores por s&iacute; solos no objetivan la localizaci&oacute;n    del tumor. Sin embargo, siendo la PET-FDG m&aacute;s sensible, puede determinar    la localizaci&oacute;n y contribuir a diagnosticar la naturaleza y extensi&oacute;n    (estadificaci&oacute;n) del tumor. En efecto, la PET-FDG puede, en diferentes    neoplasias gastrointestinales (h&iacute;gado y tumores de colon y recto) y de    otras localizaciones, detectar recurrencias y tumores primarios o metast&aacute;sicos    en casos en que existe elevaci&oacute;n del marcador CEA, o bien cuando los    datos de la TAC y RM son equ&iacute;vocos, con unos datos de sensibilidad y    exactitud diagn&oacute;stica altas<sup>69-77</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Actualmente, los    criterios de indicaci&oacute;n de la PET en el c&aacute;ncer de origen desconocido    son<sup>1, 2</sup>:</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; Pacientes    con met&aacute;stasis de origen desconocido sin evidencia de tumor primario    con las t&eacute;cnicas diagn&oacute;sticas convencionales y que sean susceptibles    de tratamiento radical.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; No se realizar&aacute;    PET en pacientes con met&aacute;stasis generalizadas.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Melanoma</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La incidencia del    melanoma maligno est&aacute; aumentando con m&aacute;s rapidez que otras patolog&iacute;as    tumorales malignas. Los melanomas pueden metastatizar en cualquier parte del    cuerpo, siendo muy dif&iacute;cil predecir la localizaci&oacute;n de estas met&aacute;stasis.    A causa de la pobre respuesta a la inmunoterapia y quimioterapia es importante    detectarlas con rapidez y extirparlas, ya que el pron&oacute;stico de un enfermo    con met&aacute;stasis distante es de 4 a 6 meses de vida.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Para la estadificaci&oacute;n    de los melanomas se utilizan diversas t&eacute;cnicas como radiograf&iacute;a    de t&oacute;rax, ultrasonidos, TAC, RM, gammagraf&iacute;a, biopsias, etc. La    ventaja que ofrece la PET-FDG se basa en que, con un solo examen, se tiene una    visi&oacute;n del cuerpo entero (<a href="#fig6">Fig. 6</a>). Ello puede suministrar    informaci&oacute;n importante sobre la malignidad del proceso patol&oacute;gico.    Por lo anterior, se est&aacute; utilizando la PET-FDG para la estadificaci&oacute;n    de los melanomas siempre que las lesiones sean mayores de 5 mm. La PET-FDG puede    ser &uacute;til en la evaluaci&oacute;n tumoral con una sensibilidad que se    sit&uacute;a en un rango del 74 al 94%, una especificidad que va del 67 al 93%    y una exactitud diagn&oacute;stica del 92%. Comparada la PET-FDG con el TAC,    la ultrasonograf&iacute;a y la gammagraf&iacute;a planar, estas t&eacute;cnicas    dan valores para la sensibilidad y especificidad inferiores a los de la PET-FDG.    Sin embargo, la incapacidad de la t&eacute;cnica en la detecci&oacute;n de la    enfermedad microsc&oacute;pica, hace necesario el complementar el estudio de    la afectaci&oacute;n ganglionar con la t&eacute;cnica del ganglio centinela.    Como elemento a destacar, la utilidad cl&iacute;nica de esta t&eacute;cnica    consiste en su capacidad de determinar si existe afectaci&oacute;n ganglionar    y si la intervenci&oacute;n quir&uacute;rgica ser&iacute;a efectiva en este    contexto, y en el tratamiento del paciente con sospecha de recurrencia operable<sup>78-80</sup>.</font></p>     <p align="center"><a name="fig6"></a></p>     <p align="center">&nbsp;</p>     <p align="center"><img src="/img/onco/v27n8/02f6.jpg"></p>     <p align="center">&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Actualmente, los    criterios de indicaci&oacute;n de la PET-FDG en melanoma son<sup>1, 2</sup>:</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; Pacientes    con sospecha de recurrencia, susceptibles de cirug&iacute;a radical, tras la    realizaci&oacute;n de todas las pruebas diagn&oacute;sticas convencionales.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">&#149; S&oacute;lo    se realizar&aacute; PET como estudio de estadificaci&oacute;n en caso de melanomas    con alta probabilidad de metastatizaci&oacute;n (Breslow &gt;4 mm).</font></p>     <p><font face="Verdana, Arial, Helvetica, 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, sans-serif" size="2">1. Tomograf&iacute;a    por emisi&oacute;n de positrones (PET) con 18FDG en oncolog&iacute;a cl&iacute;nica    (Revisi&oacute;n Sistem&aacute;tica). Informe de la Agencia de Evaluaci&oacute;n    de Tecnolog&iacute;as Sanitarias N&ordm; 30. Instituto de Salud Carlos III.    Ministerio de Sanidad y Consumo. Madrid, Noviembre de 2001.</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=4065971&pid=S0378-4835200400080000200001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">2. Protocolo de    uso tutelado para la recogida de informaci&oacute;n sobre la utilizaci&oacute;n    de la 18FDG-PET. Informe de la Agencia de Evaluaci&oacute;n de Tecnolog&iacute;as    Sanitarias. Instituto de Salud Carlos III. Ministerio de Sanidad y Consumo.    Madrid, Mayo de 2002.</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=4065972&pid=S0378-4835200400080000200002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">3. Henze M, Mohammed    A, Schlemmer HP, Herfarth KK, Hoffner S, Haufe S, et al. PET and SPECT for Detection    of Tumor Progression in Irradiated Low-Grade Astrocytoma: A Receiver-Operating-Characteristic    Analysis. 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Cancer 2001; 91:1530-42. </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=4066050&pid=S0378-4835200400080000200080&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><a name="back10"></a><a href="#top10"><img src="/img/onco/v27n8/seta.gif" border="0"></a>    <b>Direcci&oacute;n para correspondencia    <br>   </b>Dr. A. Maldonado Su&aacute;rez    <br>   Centro PET Complutense    <br>   Bartolom&eacute; Coss&iacute;o, 10    ]]></body>
<body><![CDATA[<br>   E-28040 Madrid    <br>   E-mail: <a href="mailto:director@petmadrid.com">director@petmadrid.com</a>    <br>   Web: <a href="http://www.petmadrid.com" target="_blank">www.petmadrid.com</a></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Recibido: 03.06.04    <br>   </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Aceptado:    14.07.04</font></p>      ]]></body><back>
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