<?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>S0378-48352007000300004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[La PET y PET-CT en la estadificación y tratamiento del cáncer de pulmón no microcítico]]></article-title>
<article-title xml:lang="en"><![CDATA[PET and PET-CT in the staging and treatment of non-small cell lung cancer]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Provencio]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valcárcel]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Varela]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maldonado]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Alenda]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moradiellos]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chamorro]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
<xref ref-type="aff" rid="A06"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Universitario Clínica Puerta de Hierro Servicio de Oncología Médica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital Universitario Clínica Puerta de Hierro Servicio de Radiodiagnóstico ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Hospital Universitario Clínica Puerta de Hierro Servicio de Radioterapia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,Hospital Universitario Clínica Puerta de Hierro Servicio de Cirugía Torácica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A05">
<institution><![CDATA[,Hospital Universitario Clínica Puerta de Hierro Servicio de Medicina Nuclear ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>España</country>
</aff>
<aff id="A06">
<institution><![CDATA[,Centro PET Recoletas La Milagrosa  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2007</year>
</pub-date>
<volume>30</volume>
<numero>3</numero>
<fpage>28</fpage>
<lpage>40</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0378-48352007000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0378-48352007000300004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0378-48352007000300004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La tomografía por emisión de positrones con 2-(18F)-fluoro-2-desoxi-D-glucosa (PET-FDG) es una técnica metabólica de imagen. La PET-FDG es más precisa que el CT en la valoración de la afectación mediastínica en los pacientes con carcinoma de pulmón no microcítico, con un alto valor predictivo negativo. Puede detectar metástasis ocultas en el 11% de los pacientes, si bien, la etiología de las captaciones solitarias extratorácicas debe ser confirmada. La PET-FDG, teóricamente, puede influir en el volumen de planificación de la radioterapia, sobre todo en los pacientes con atelectasia. La cuantificación de la actividad metabólica mediante la PET-FDG está influenciada por el tamaño de la lesión, los niveles de glucosa, el tiempo que transcurre desde la inyección del isótopo. Se necesitan más ensayos clínicos para la estandarización de los métodos de realización del PET, su uso como factor pronóstico y para la valoración de la respuesta al tratamiento.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Positron emission tomography with (18F)2-fluoro-2-deoxy-D-glucose (PET-FDG) is an imaging metabolic technique. PET-FDG is more precise than CT for the evaluation of mediastinal affectation of patients with non-small cell lung cancer, offering a high negative predictive value. It can detect occult metastases in 11 % of the patients, although the etiology of the extra-thoracic isolated receptions needs confirmation. Theoretically, PET-FDG can influence the planning volume of radiotherapy, mainly of patients with atelectasis. The quantification of the metabolic activity by means of PET-FDG is influenced by the size of the lesion, the glucose levels, and the time elapsed since the isotope injection. More clinical assays are needed to standardize PET execution procedures, its use as a prognostic factor and the evaluation of treatment response.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Tomografía de emisión de positrones]]></kwd>
<kwd lng="es"><![CDATA[PET-FDG]]></kwd>
<kwd lng="es"><![CDATA[Cáncer de pulmón no microcítico]]></kwd>
<kwd lng="en"><![CDATA[Positron emission tomography]]></kwd>
<kwd lng="en"><![CDATA[PET-FDG]]></kwd>
<kwd lng="en"><![CDATA[Non-small cell lung cancer]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><b><a name="top10"></a>La    PET y PET-CT en la estadificaci&oacute;n y tratamiento del c&aacute;ncer de    pulm&oacute;n no microc&iacute;tico</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>M. Provencio<sup>I</sup>;    A. S&aacute;nchez<sup>I</sup>; C. Gonz&aacute;lez<sup>II</sup>; F. Valc&aacute;rcel<sup>III</sup>;    A. Varela<sup>IV</sup>; A. Maldonado<sup>V</sup>; J. Gonz&aacute;lez-Alenda<sup>V</sup>;    J. Moradiellos<sup>IV</sup>; J. L. Chamorro<sup>VI</sup></b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><sup>I</sup>Servicio    de Oncolog&iacute;a M&eacute;dica    <br>   <sup>II</sup>Radiodiagn&oacute;stico    <br>   <sup>III</sup>Radioterapia    <br>   <sup>IV</sup>Cirug&iacute;a Tor&aacute;cica    ]]></body>
<body><![CDATA[<br>   <sup>V</sup>Medicina Nuclear Hospital Universitario Cl&iacute;nica Puerta de    Hierro. Madrid (Espa&ntilde;a)    <br>   <sup>VI</sup>Centro    PET Recoletas La Milagrosa</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><a href="#back">Correspondencia</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1" noshade>     <p><font face="Verdana, Arial, Helvetica, 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 2-(<sup>18</sup>F)-fluoro-2-desoxi-D-glucosa    (PET-FDG) es una t&eacute;cnica metab&oacute;lica de imagen. La PET-FDG es m&aacute;s    precisa que el CT en la valoraci&oacute;n de la afectaci&oacute;n mediast&iacute;nica    en los pacientes con carcinoma de pulm&oacute;n no microc&iacute;tico, con un    alto valor predictivo negativo. Puede detectar met&aacute;stasis ocultas en    el 11% de los pacientes, si bien, la etiolog&iacute;a de las captaciones solitarias    extrator&aacute;cicas debe ser confirmada. La PET-FDG, te&oacute;ricamente,    puede influir en el volumen de planificaci&oacute;n de la radioterapia, sobre    todo en los pacientes con atelectasia. La cuantificaci&oacute;n de la actividad    metab&oacute;lica mediante la PET-FDG est&aacute; influenciada por el tama&ntilde;o    de la lesi&oacute;n, los niveles de glucosa, el tiempo que transcurre desde    la inyecci&oacute;n del is&oacute;topo. Se necesitan m&aacute;s ensayos cl&iacute;nicos    para la estandarizaci&oacute;n de los m&eacute;todos de realizaci&oacute;n del    PET, su uso como factor pron&oacute;stico y para la valoraci&oacute;n de la    respuesta al tratamiento.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Palabras clave:</b>    Tomograf&iacute;a de emisi&oacute;n de positrones. PET-FDG. C&aacute;ncer de    pulm&oacute;n no microc&iacute;tico.</font></p> <hr size="1" noshade>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>SUMMARY</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Positron emission    tomography with (18F)2-fluoro-2-deoxy-D-glucose (PET-FDG) is an imaging metabolic    technique. PET-FDG is more precise than CT for the evaluation of mediastinal    affectation of patients with non-small cell lung cancer, offering a high negative    predictive value. It can detect occult metastases in 11 % of the patients, although    the etiology of the extra-thoracic isolated receptions needs confirmation. Theoretically,    PET-FDG can influence the planning volume of radiotherapy, mainly of patients    with atelectasis. The quantification of the metabolic activity by means of PET-FDG    is influenced by the size of the lesion, the glucose levels, and the time elapsed    since the isotope injection. More clinical assays are needed to standardize    PET execution procedures, its use as a prognostic factor and the evaluation    of treatment response.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Key words</b>:    Positron emission tomography. PET-FDG. Non-small cell lung cancer.</font></p> <hr size="1" noshade>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b>Introducci&oacute;n</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El tratamiento    de los pacientes con c&aacute;ncer de pulm&oacute;n no microc&iacute;tico (CPNM)    se establece seg&uacute;n el estadio tumoral. La clasificaci&oacute;n TNM proporciona    la informaci&oacute;n m&aacute;s precisa sobre la resecabilidad y pron&oacute;stico    del tumor<sup>1</sup>. La correcta estadificaci&oacute;n es esencial para indicar    el tratamiento adecuado. La tomograf&iacute;a por emisi&oacute;n de positrones    (PET) es un m&eacute;todo complementario a la tomograf&iacute;a axial computerizada    (CT) en la determinaci&oacute;n de la extensi&oacute;n del CPNM<sup>2</sup>.    La PET con 2-(<sup>18</sup>F)-fluoro-2-desoxi-D-glucosa (PET-FDG) se basa en    el elevado metabolismo de la glucosa en el interior de las c&eacute;lulas tumorales    en comparaci&oacute;n con las c&eacute;lulas sanas, que se produce como resultado    de un incremento en la expresi&oacute;n de las prote&iacute;nas transportadoras    de la glucosa como la GLUT1 y de la hexoquinasa (una enzima que fosforila la    glucosa). El &#91;<sup>18</sup>F&#93;FDG intracelular es el sustrato b&aacute;sico del    PET. La imagen de la PET-FDG se realiza por la r&aacute;pida capacidad para    minimizar la inhibici&oacute;n competitiva de la captaci&oacute;n de FDG por    la glucosa.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">A continuaci&oacute;n,    estudiaremos el papel del PET, s&oacute;lo o asociado al CT en diferentes situaciones    cl&iacute;nicas: estadificaci&oacute;n tumoral, pron&oacute;stico y en respuesta    al tratamiento.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Estadificaci&oacute;n    tumoral</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>El    estudio de la extensi&oacute;n del tumor primario pulmonar</b> se realiza mediante    CT y, en ocasiones se complementa con resonancia magn&eacute;tica en determinadas    situaciones cl&iacute;nicas como tumores del sulcus superior o para establecer    la relaci&oacute;n con estructuras vasculares como los grandes vasos o el coraz&oacute;n.    En contraste con la CT, que aporta una imagen anat&oacute;mica, la PET-FDG se    basa en la actividad biol&oacute;gica de las c&eacute;lulas tumorales. Las c&eacute;lulas    tumorales del c&aacute;ncer de pulm&oacute;n muestran una alta captaci&oacute;n    y utilizaci&oacute;n de la glucosa comparadas con las c&eacute;lulas del tejido    pulmonar o linf&aacute;tico<sup>3</sup>. Sin embargo, esta t&eacute;cnica tiene    limitaciones en su capacidad para la localizaci&oacute;n anat&oacute;mica de    las lesiones. Algunos procesos no tumorales como granulomas o enfermedades inflamatorias,    y las infecciones pueden mostrar captaciones positivas en PET-FDG. Por otra    parte, la capacidad de resoluci&oacute;n del PET es de 4-6 mm, dependiendo de    la intensidad de la captaci&oacute;n del is&oacute;topo por las c&eacute;lulas    normales<sup>4</sup>. Todo ello, hace que en tumores con tama&ntilde;o inferior    a 2 cm la PET-FDG sea de poca utilidad con un alto porcentaje de falsos negativos    (45%)<sup>5</sup> . Por lo tanto, debido a su limitada resoluci&oacute;n espacial    no tiene un papel espec&iacute;fico en la estadificaci&oacute;n del tumor primario.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Algunos estudios    indican que la PET-FDG puede ser m&aacute;s &uacute;til en la evaluaci&oacute;n    del derrame pleural. La toracocentesis puede no ser diagn&oacute;stica en un    30%-40% de los pacientes que tienen derrame pleural tumoral. En un estudio,    a 35 pacientes con c&aacute;ncer de pulm&oacute;n y derrame pleural objetivado    en CT, se les realiz&oacute; PET-FDG<sup>6</sup>. La sensibilidad, especificidad    y exactitud diagn&oacute;stica del PET fueron 89%, 94% y 91%, respectivamente.    En otro estudio, la sensibilidad, especificidad y exactitud fueron 95%, 67%,    y 92%, respectivamente<sup>7</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Numerosos estudios    han evaluado el valor del CT en la <b>estadificaci&oacute;n del mediastino</b><sup>8-10</sup>.    En la mayor&iacute;a de ellos, el principal criterio para la valoraci&oacute;n    de la afectaci&oacute;n mediast&iacute;nica era la presencia de adenopat&iacute;as    mayores de 10 mm. En un metaan&aacute;lisis, Toloza<sup>11</sup> y cols. analizaron    diversos estudios que comparaban el CT con mediastinoscopia o con cirug&iacute;a.    La sensibilidad de la CT fue 0.57 (95% CI, 0,49 - 0,66) y la especificidad de    0.82 (95% CI, 0.77 - 0.86). El valor predictivo positivo (VPP) fue de 0.56 y    el valor predictivo negativo (VPN) de 0.83. En conclusi&oacute;n, la CT muestra    un elevado n&uacute;mero de resultados falsos positivos. Adem&aacute;s, estudios    realizados entre 1980 y 1988 mostraron los mismos resultados que en la &uacute;ltima    d&eacute;cada, a pesar de la mejora de la resoluci&oacute;n de la CT . Por lo    tanto, el estudio con CT es insatisfactorio para la determinaci&oacute;n de    la afectaci&oacute;n mediast&iacute;nica (N2 y N3), especialmente desde que    su afectaci&oacute;n se considera un punto cr&iacute;tico para la consideraci&oacute;n    de enfoques quir&uacute;rgicos. Sin embargo, debido a su alta resoluci&oacute;n    espacial, la CT de t&oacute;rax se considera una prueba diagn&oacute;stica &uacute;til    para la confirmaci&oacute;n histol&oacute;gica del mediastino, ya que permite    la selecci&oacute;n de las adenopat&iacute;as para la punci&oacute;n-aspiraci&oacute;n    o para la mediastinoscopia<sup>12</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En el metaan&aacute;lisis    m&aacute;s reciente<sup>13</sup>, la sensibilidad de la PET-FDG para la detecci&oacute;n    de la afectaci&oacute;n mediast&iacute;nica variaba entre el 66% y el 100% (<a href="/img/revistas/onco/v30n3/04f1.gif" target="_blank">Fig.    1</a>). La sensibilidad global estimada fue del 83% (95%, CI 77 - 87). La especificidad    variaba entre el 81% y el 100%, con una especificidad global estimada del 92%    (95% CI, 89 - 95). La sensibilidad y la especificidad de la CT para la detecci&oacute;n    de la afectaci&oacute;n mediast&iacute;nica variaba entre el 20% y el 81%, y    entre el 44% y el 100%, respectivamente. La sensibilidad y especificidad estimada    fue del 59% (95% CI, 50 - 67) y del 78% (95% CI, 70 - 84), respectivamente.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Comparando los    resultados de la PET-FDG con los del examen histol&oacute;gico y citol&oacute;gico    se encontr&oacute; que: la sensibilidad fue del 0.84 (95% CI, 0.79 - 0.89) y    la especificidad del 0.89 (95% CI, 0.83 - 0.93). El VPP fue de 0.79 (95% CI,    0.40 - 1.00) y el VPN fue de 0.93 (95% CI, 0.75 - 1.00). Por lo tanto, en el    caso de un PET positivo, la probabilidad de un resultado falso positivo fue    del 21%, lo que puede influenciar de manera significativa la elecci&oacute;n    del tratamiento (quir&uacute;rgico o no). Se recomienda confirmar anatomopatol&oacute;gicamente    un resultado positivo del PET en el mediastino, en el caso de enfermedad no    metast&aacute;sica<sup>14,15</sup>. Adem&aacute;s, el PET es incapaz de distinguir    focos metast&aacute;sicos menores de 4mm. En todo caso, se recomienda la confirmaci&oacute;n    patol&oacute;gica de la afectaci&oacute;n mediast&iacute;nica diagnosticada    por PET-FDG<sup>16</sup> teniendo en cuenta adem&aacute;s que el n&uacute;mero    de falsos positivos puede estar entre el 20 y 25%.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Sin embargo, cuando    la CT muestra afectaci&oacute;n mediast&iacute;nica patol&oacute;gica, la PET-FDG    es m&aacute;s sensible pero menos espec&iacute;fica<sup>17</sup> que la CT .    Debido a las limitaciones de su resoluci&oacute;n espacial, a menudo no es posible    distinguir el tumor primario o la afectaci&oacute;n ganglionar hiliar de la    afectaci&oacute;n mediast&iacute;nica. Esto se valor&oacute; en un reciente    estudio con 400 pacientes, donde se observ&oacute; que era m&aacute;s probable    no detectar la afectaci&oacute;n N2 en los ganglios suba&oacute;rticos y subcarinales<sup>18</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En el ensayo PLUS<sup>19</sup>,    188 pacientes con sospecha de CPNM fueron aleatorizados a realizar un estudio    de extensi&oacute;n convencional con/sin PET, previo a la valoraci&oacute;n    quir&uacute;rgica de la enfermedad. En el grupo de pacientes en los que se realiz&oacute;    PET-FDG, hubo un 51% (95% CI, 32-80%; p:0.003) de reducci&oacute;n de toracotom&iacute;as    innecesarias y un 8% de afectaci&oacute;n metast&aacute;sica no conocida. La    adici&oacute;n del PET al estudio de extensi&oacute;n convencional podr&iacute;a    prevenir cirug&iacute;as innecesarias en el 20% de los pacientes con sospecha    de CPNM. Sin embargo, el estudio presenta un importante n&uacute;mero de problemas    metodol&oacute;gicos, incluyendo una pobre estadificaci&oacute;n en el grupo    control, con un peque&ntilde;o n&uacute;mero de mediastinoscopias y, un escaso    uso de CT de nueva generaci&oacute;n, s&oacute;lo realizado en el 55% de los    pacientes<sup>20</sup>. Otros dos grandes ensayos no demuestran una disminuci&oacute;n    del n&uacute;mero de toracotom&iacute;as en los pacientes en los que se incluy&oacute;    la PET-FDG en la estadificaci&oacute;n preoperatoria<sup>21, 22</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Adem&aacute;s,    la PET-FDG muestra limitaciones en la valoraci&oacute;n de algunos tipos de    tumores de metabolismo singular como son el carcinoide y el carcinoma bronquioalveolar.    Recientes estudios asocian la expresi&oacute;n de transportadores de glucosa    de membrana con el grado de diferenciaci&oacute;n y el subtipo histol&oacute;gico<sup>23</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En resumen<sup>24</sup>,    los estudios con PET-FDG presentan un elevado VPN (94%) en la estadificaci&oacute;n    del mediastino. Por lo tanto, en los pacientes sin afectaci&oacute;n mediast&iacute;nica    en PET se podr&iacute;a llevar a cabo la cirug&iacute;a directamente.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La mediastinoscopia,    tal como afirma Rusch, continua siendo el "gold standard" en la estadificaci&oacute;n    prequir&uacute;rgica del mediastino, pero en el futuro podr&iacute;a ser sustituida    por la PET-CT y la punci&oacute;n con aguja fina (PAAF) guiada por endoscopia<sup>25</sup>.    Por ahora, la PET y la CT son t&eacute;cnicas complementarias y ambas deben    interpretarse en el contexto de los resultados de la otra.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Lesiones metast&aacute;sicas</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">A pesar de la mayor    sensibilidad, especificidad y exactitud diagn&oacute;stica de la PET-FDG en    la detecci&oacute;n de la extensi&oacute;n metast&aacute;sica, no conocemos    bien su papel y si podr&iacute;a reemplazar a las pruebas radiol&oacute;gicas    convencionales, debido a que en la mayor&iacute;a de los estudios &eacute;ste    se realiz&oacute; como una t&eacute;cnica adicional<sup>26</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La incidencia de    met&aacute;stasis ocultas diagnosticadas mediante PET-FDG vari&oacute; entre    el 9 y el 24%<sup>2,27,28</sup>. El n&uacute;mero de las met&aacute;stasis detectadas    por PET-FDG aument&oacute; conforme aumentaba la estadificaci&oacute;n del paciente,    desde el 8% en los estadios I, al 18% en el estadio II, y hasta al 24% en el    estadio III<sup>29</sup> (<a href="#tab1">Tabla I</a>).</font></p>     ]]></body>
<body><![CDATA[<p><a name="tab1"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/onco/v30n3/04t1.gif"></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Cuando la PET-FDG    muestra una &uacute;nica captaci&oacute;n extrator&aacute;cica se presenta una    situaci&oacute;n cl&iacute;nica problem&aacute;tica debido a que la PET-FDG    no es espec&iacute;fica de malignidad. Lardinois en un excelente estudio<sup>30</sup>    muestra que el PET-CT descubre lesiones &uacute;nicas extrapulmonares en el    21% de los pacientes con CPNM (<a href="/img/revistas/onco/v30n3/04f2.gif" target="_blank">Fig. 2</a>). En la    mitad de los casos, las lesiones no se correspond&iacute;an con met&aacute;stasis,    sino que correspond&iacute;an con otros tumores malignos, como se hab&iacute;a    observado en anteriores estudios<sup>31</sup> o, con lesiones benignas. Por    tanto, la etiolog&iacute;a de las captaciones solitarias extrapulmonares de    la PET-FDG deben ser confirmadas histol&oacute;gicamente, m&aacute;s cuando    la actitud terap&eacute;utica puede variar por estos hallazgos. Se debe prestar    especial atenci&oacute;n a las captaciones solitarias en el bazo, axila, canal    espinal, tracto gastrointestinal y p&aacute;ncreas.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En casi el 10%    de los pacientes con CPNM, las gl&aacute;ndulas suprarrenales se encuentran    aumentadas de tama&ntilde;o al diagn&oacute;stico en el estudio de CT. Aproximadamente    dos tercios de estas lesiones suprarrenales van a ser benignas. Incluso, la    resonancia magn&eacute;tica muestra un elevado n&uacute;mero de falsos positivos<sup>32</sup>.    La PET-FDG puede ser &uacute;til en esta situaci&oacute;n, ya que su alta sensibilidad    (95%-100%) y especificidad (80%-100%) puede permitir una reducci&oacute;n del    n&uacute;mero de biopsias suprarrenales<sup>33-36</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La PET-FDG no es    &uacute;til para la detecci&oacute;n de met&aacute;stasis cerebrales, dado que    la corteza cerebral presenta un elevado consumo de glucosa. Su sensibilidad    es baja (60%) debido a la alta afinidad de la glucosa por el tejido cerebral    normal.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En la actualidad,    la afectaci&oacute;n &oacute;sea generalmente se eval&uacute;a mediante gammagraf&iacute;a    &oacute;sea con <sup>99m</sup>TC-MDP, que tiene una buena sensibilidad (90%)    pero una baja especificidad (60%) por el elevado n&uacute;mero de falsos positivos    debidos a la captaci&oacute;n del radion&uacute;clido en cualquier &aacute;rea    de elevada actividad &oacute;sea. La PET-FDG tiene una sensibilidad similar    (90%) pero una mayor especificidad (&gt;98%) y exactitud (&gt;96%), y un menor    n&uacute;mero de falsos positivos en los casos de procesos degenerativos, inflamatorios,    y post-traum&aacute;ticos comparados con la gammagraf&iacute;a, por lo que se    puede considerar superior en la detecci&oacute;n de la afectaci&oacute;n &oacute;sea    metast&aacute;sica<sup>37-39</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Impacto en el    estadificaci&oacute;n y tratamiento de los pacientes</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Diferentes estudios    han analizado los cambios que se producen en la estadificaci&oacute;n e incluso    en el tratamiento de los pacientes con la utilizaci&oacute;n de la PET-FDG .</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Un reciente estudio    publicado en <i>Oncolog&iacute;a</i> en nuestro pa&iacute;s, el PET modificaba    el tratamiento inicialmente previsto en el 30% de lo pacientes estudiados con    c&aacute;ncer de pulm&oacute;n<sup>40</sup> pasando de una cirug&iacute;a radical    a quimioterapia o quimiorradioterapia. En la <a href="#tab2">Tabla II</a> resumimos    alguno de los estudios publicados, el cambio en el estadio var&iacute;a entre    el 27 al 60% y el impacto sobre clara modificaci&oacute;n en el tratamiento    entre el 25 y el 50%.</font></p>     <p><a name="tab2"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/onco/v30n3/04t2.gif"></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Valor pron&oacute;stico    al diagn&oacute;stico</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Se han estudiado    varios m&eacute;todos de imagen basados en el metabolismo tumoral<sup>43</sup>.    La captaci&oacute;n de &#91;<sup>18</sup>F&#93;FDG por las c&eacute;lulas tumorales    del CPNM se asocia con el crecimiento y la proliferaci&oacute;n celular. La    medida de la captaci&oacute;n <i>in vivo</i> mediante PET-FDG usando el SUV    <i>(standarised uptake value)</i> se ha investigado como una posible variable    de agresividad y factor pron&oacute;stico<sup>44, 45</sup>. El SUV es un valor    semicuantitativo y se ha asociado con factores de proliferaci&oacute;n celular    como Ki-67 y el ant&iacute;geno nuclear de proliferaci&oacute;n celular<sup>46,    47</sup>. En series retrospectivsas<sup>48-53</sup> de pacientes con CPNM se    ha sugerido que el SUV en el tumor primario pulmonar en el momento del diagn&oacute;stico    es predictivo de control de la enfermedad y de supervivencia. El punto del corte    del SUV en los an&aacute;lisis univariantes de los diferentes estudios es muy    variable, desde 5 a 7, 10, 15 o incluso 20.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El SUV proporciona    informaci&oacute;n pron&oacute;stica independiente, a parte del estadio y tama&ntilde;o    tumoral, estadio y estado general o estadio s&oacute;lo. En un estudio reciente<sup>54</sup>,    el SUV del tumor primario fue el factor pron&oacute;stico m&aacute;s importante    entre los pacientes tratados con cirug&iacute;a curativa o radioterapia. Los    pacientes con valores bajos de SUV (&lt;5.0) presentaron significativamente    una mejor supervivencia libre de enfermedad, que los pacientes con valores elevados    (&gt;5.0). Sin embargo, usando el mismo punto de corte de 5, el valor del SUV    para la afectaci&oacute;n linf&aacute;tica regional no fue un factor significativo    en la supervivencia libre de enfermedad. El an&aacute;lisis multivariante mostr&oacute;    que el SUV del tumor primitivo fue un factor pron&oacute;stico significativo    para la supervivencia global y la supervivencia libre de enfermedad.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Por otra parte,    hay varios factores que pueden influir cuantitativamente en las medidas de la    captaci&oacute;n de la glucosa por las c&eacute;lulas tumorales<sup>55</sup>.    As&iacute;, los carcinomas escamosos parecen presentar un SUV superior al adenocarcinoma<sup>56</sup>.    El tama&ntilde;o tumoral tiene una influencia significativa en el valor del    SUV. Existe una marcada subestimaci&oacute;n de la captaci&oacute;n del &#91;<sup>18</sup>F&#93;FDG    en los tumores de hasta 3-4 cm. S&oacute;lo cuando el di&aacute;metro de la    lesi&oacute;n es sobre 4 veces el tama&ntilde;o de la resoluci&oacute;n espacial    del CT , las diferencias entre la concentraci&oacute;n del pico medido de actividad    y la concentraci&oacute;n de la actividad real es menor del 5%. Igualmente,    la captaci&oacute;n puede ser subestimada en los tumores con necrosis central,    con baja captaci&oacute;n de &#91;<sup>18</sup>F&#93;FDG, incluso si el di&aacute;metro    de todo el tumor es mayor de 4 cm. Otros factores que pueden influir en la captaci&oacute;n    son: niveles de glucosa en sangre, m&aacute;s baja con el incremento de los    niveles de glucosa, al competir esta por el transportador; y tambi&eacute;n    el periodo de tiempo tras la inyecci&oacute;n del radiof&aacute;rmaco, ya que    existe un aumento de la captaci&oacute;n de &#91;<sup>18</sup>F&#93;FDG del 50% entre    los 40 y 90 minutos tras la inyecci&oacute;n<sup>57</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Weber realiza una    comparaci&oacute;n interindividual realizando dos pruebas en el mismo paciente    y esperando un periodo de 4-6 semanas tras la finalizaci&oacute;n del tratamiento.    Esta estrategia reduce de manera significativa el n&uacute;mero de factores    que pueden influir en la se&ntilde;al del &#91;<sup>18</sup>F&#93;FDG. La precisi&oacute;n    del la PET-FDG para la medida de los cambios en la glucosa tumoral es considerablemente    mejor que la ofrece para la cuantificaci&oacute;n del uso de la glucosa tumoral    en unidades absolutas.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Se necesitan m&aacute;s    estudios para la estandarizaci&oacute;n de los m&eacute;todos de realizaci&oacute;n    de la PET-FDG y de la medida del SUV, para definir los mecanismos celulares    subyacentes, y la validaci&oacute;n del valor pron&oacute;stico basal de la    captaci&oacute;n de &#91;<sup>18</sup>F&#93;FDG.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Respuesta al    tratamiento</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El sistema de regresi&oacute;n    gradual de la captaci&oacute;n de la PET-FDG sugiere ser un factor pron&oacute;stico    significativo en los pacientes con CPNM localmente avanzado tras el tratamiento    neoadyuvante<sup>58</sup>. En otros tumores, como en el linfoma<sup>59, 60</sup>,    c&aacute;ncer esof&aacute;gico<sup>61, 62</sup>, c&aacute;ncer de est&oacute;mago<sup>63</sup>,    y osteosarcoma<sup>64</sup> una disminuci&oacute;n en la captaci&oacute;n de    &#91;<sup>18</sup>F&#93;FDG ha demostrado ser lo m&aacute;s exacto para la predicci&oacute;n    de la regresi&oacute;n histopatol&oacute;gica.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Dado que el &#91;<sup>18</sup>F&#93;FDG    se acumula preferentemente en la c&eacute;lulas tumorales viables y no en el    tejido necr&oacute;tico, un cambio en la captaci&oacute;n de &#91;<sup>18</sup>F&#93;FDG    en el PET pudiera ser una buena variable para la monitorizaci&oacute;n de la    respuesta, y, en teor&iacute;a, podr&iacute;a ser capaz de objetivar una respuesta    precoz. Recientemente, el activo grupo de UCLA ha publicado un estudio que ilustra    la base racional de la utilizaci&oacute;n de glucosa y el efecto de gefitinib    sobre un panel de l&iacute;neas celulares con un espectro de sensibilidad a    los inhibidores de EGFR quinasa<sup>65</sup>. Encuentran una clara disminuci&oacute;n    de la captaci&oacute;n de glucosa muy precozmente en aquellas l&iacute;neas    celulares sensibles a gefitinib, que precede en el tiempo a otros cambios celulares    y a la apotosis. Con las limitaciones que los estudios sobre l&iacute;neas celulares    que los mismos autores reconocen, &eacute;ste aporta varios aspectos de mucho    inter&eacute;s. Primero que la investigaci&oacute;n de la respuesta mediante    MicroPET puede hacerse desde niveles b&aacute;sicos de cultivos celulares, y    por otra parte aporta datos importantes para la evaluaci&oacute;n de PET en    predicci&oacute;n de respuesta a inhibidores de la EGFR quinasa. Sin duda un    camino muy atractivo que ser&iacute;a deseable contin&uacute;e explor&aacute;ndose    en el futuro.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El papel de la    PET-FDG en la reestadificaci&oacute;n de los pacientes con CPNM tras tratamiento    neoadyuvante con quimioradioterapia no ha sido completamente evaluado (<a href="/img/revistas/onco/v30n3/04f3.gif" target="_blank">Fig.    3</a>). Hay cinco estudios prospectivos<sup>66-70</sup> que eval&uacute;an el    valor de la PET-FDG en la monitorizaci&oacute;n de la respuesta a la quimioterapia    o radioterapia en pacientes con CPNM. Estos estudios difieren sustancialmente    en el tama&ntilde;o, criterios de selecci&oacute;n de pacientes, procedimientos    de imagen e interpretaci&oacute;n, pero todos ellos indicaron un posible papel    de la PET-FDG en la determinaci&oacute;n de la respuesta al tratamiento. Indican    que la PET-FDG es &uacute;til en la monitorizaci&oacute;n del tratamiento neoadyuvante    quimioradioter&aacute;pico en pacientes con CPNM. La r&aacute;pida identificaci&oacute;n    de los pacientes no respondedores mediante la PET-FDG podr&iacute;a ser beneficioso    al reducir significativamente los efectos secundarios y el coste de un tratamiento    no eficaz. En todos estos estudios, la PET-FDG tuvo un alto VPN en la valoraci&oacute;n    de la respuesta.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Hoekstra<sup>71</sup>    y cols. realizaron un an&aacute;lisis comparativo de los m&eacute;todos del    PET y, la exactitud diagn&oacute;stica de la medida de la respuesta precoz usando    el PET respecto a la supervivencia en los pacientes en estadio IIIA-N2 que han    recibido quimioterapia neoadyuvante. La PET-FDG se realiz&oacute; antes de la    quimioterapia y tras el primer y tercer ciclo. La CT se realiz&oacute; antes    y despu&eacute;s del tratamiento. Tras el primer ciclo de quimioterapia, la    presencia de captaci&oacute;n focal en el mediastino no tuvo valor predictivo    respecto a la supervivencia (p=0.74). Pero al final del tratamiento, la determinaci&oacute;n    del mediastino por PET-FDG predijo la supervivencia de los pacientes (hazard    ratio (HR), 2.33; 95% CI, 1.04 - 5.22; p= 0,04) en comparaci&oacute;n con la    CT (HR, 1.87; 95% CI, 0.81 - 4.30; p=.14). Los autores estudiaron el consumo    de glucosa <i>(metabolic rate of glucose &#91;MR<sub>glu</sub> &#93;)</i> y la glucosa    residual tras el tratamiento (MR<sub>glu</sub>), que fue el mejor factor pron&oacute;stico    (HR, 1.95; 95% CI, 1.28 - 2.97, p=0.002). La sensibilidad y especificidad de    la PET-FDG tras la quimioterapia neoadyuvante en pacientes N2 fue 50% (95% IC,    19% - 81%) y 71% (95% CI, 42% - 92%) respectivamente, y el correspondiente VPP    y VPP fue 66% (95% CI, 21% - 86%) y 67% (95% CI, 38% - 88%). Estos datos indican    que la captaci&oacute;n residual durante o despu&eacute;s del tratamiento podr&iacute;a    ser un buen marcador pron&oacute;stico. Se pueden considerar algunos par&aacute;metros    relacionados con MR<sub>glu</sub> para obtener una estratificaci&oacute;n pron&oacute;stica:    cambio fraccional, niveles basales o residuales del metabolismo de la glucosa.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El valor de la    PET-FDG en la monitorizaci&oacute;n de la respuesta es complejo de determinar    debido a la heterogeneicidad de los datos publicados con respecto a los m&eacute;todos    aplicados de PET<sup>72</sup>, y a los diferentes objetivos cl&iacute;nicos    en los estudios. En general, la determinaci&oacute;n del intervalo &oacute;ptimo    de su realizaci&oacute;n desde la administraci&oacute;n del tratamiento quimioter&aacute;pico    neoadyuvante no est&aacute; aclarado y la evidencia en los estudios de neoadyuvancia    es todav&iacute;a demasiado limitada.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Planificaci&oacute;n    de la radioterapia</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En teor&iacute;a    la PET-FDG puede influir el volumen planificado del tratamiento con radioterapia    y proporcionar una reducci&oacute;n de la dosis sobre tejido sano. Adem&aacute;s,    el fracaso local confirmado mediante biopsia ocurre hasta en el 83% de los estadios    III, indicando la necesidad de mejorar el control local, a pesar de las altas    dosis de radiaci&oacute;n administradas.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Numerosos estudios    eval&uacute;an la informaci&oacute;n que aporta la PET-FDG en la planificaci&oacute;n    de la radioterapia. En un estudio de viabilidad con varios tumores s&oacute;lidos,    la informaci&oacute;n proporcionada por la PET-FDG cambiaba el volumen tumoral    en 22/39 (56%) si la informaci&oacute;n de la imagen metab&oacute;lica era usada    en la planificaci&oacute;n<sup>73</sup>. En los pacientes con CPNM estadio N2-N3,    el uso de la PET-FDG en la planificaci&oacute;n del tratamiento con radioterapia,    reduc&iacute;a la exposici&oacute;n a la radiaci&oacute;n del es&oacute;fago    y del pulm&oacute;n, y de este modo permit&iacute;a una significativa escalada    de la dosis respetando los l&iacute;mites de dosis en los tejidos sanos<sup>74</sup>.    Adem&aacute;s, se observ&oacute; la presencia de variaci&oacute;n interobservador    y este factor contribuy&oacute; a las diferencias en la determinaci&oacute;n    de los l&iacute;mites tumorales<sup>75, 76, 77</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Vanuystel y cols.    estudiaron una comparaci&oacute;n te&oacute;rica del tama&ntilde;o de los vol&uacute;menes    tumorales (<i>gross tumor volumes, GTVs)</i> definidos por CT , y mediante ambos    PET-FDG y CT . Los hallazgos de la PET-FDG alteraron los vol&uacute;menes te&oacute;ricos    en 45 de 73 pacientes (62%).<sup>78</sup> Bradley, en un reciente estudio prospectivo<sup>79</sup>,    analiz&oacute; c&oacute;mo los hallazgos de la PET-FDG alteraban el estadio    TNM en 8 de 26 pacientes (31%). De los 24 pacientes que fueron planificados    mediante el m&eacute;todo de la radioterapia conformacional tridimensional,    la PET-FDG claramente alter&oacute; el volumen de radiaci&oacute;n en 14 (58%).    La PET-FDG ayud&oacute; a delimitar el tumor dentro de las &aacute;reas de atelectasia    en tres pacientes, reduciendo el GTV de cada uno. La adici&oacute;n de la PET-FDG    no modific&oacute; el estadio asignado a ninguno de los pacientes. Por otra    parte, increment&oacute; el GTV en 11 pacientes.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Deniaud-Alexandre<sup>80</sup>    y cols., en un estudio retrospectivo, confirmaron que el PET-TAC tiene impacto    en la planificaci&oacute;n del tratamiento y el manejo del CPNM. En este estudio,    con un total de 101 pacientes, la PET-FDG identific&oacute; met&aacute;stasis    ocultas en el 8 pacientes (8%), y el GTV disminuy&oacute;, con la fusi&oacute;n    de las im&aacute;genes del PET-CT , en 21 pacientes y aument&oacute; en 24 pacientes.    La reducci&oacute;n del GTV fue &gt; 25% en 7 pacientes (7%) debido a que la    fusi&oacute;n de im&aacute;genes del PET-CT redujo el GTV en 6 pacientes (3    de ellos con atelectasia) y la afectaci&oacute;n mediast&iacute;nica en 1 paciente.    El aumento del GTV fue &gt;25% en 14 pacientes (14%) debido a un incremento    en el GTV en 11 pacientes (4 de ellos con atelectasia) y la detecci&oacute;n    de afectaci&oacute;n mediast&iacute;nica no conocida en 3 pacientes. El an&aacute;lisis    multivariante mostr&oacute; que el tumor con atelectasia fue el &uacute;nico    factor independiente que result&oacute; tener un efecto significativo en la    modificaci&oacute;n del tama&ntilde;o del GTV mediante PET-CT.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">El uso del PET    en la simulaci&oacute;n aumentar&aacute; la precisi&oacute;n de acuerdo con    el GTV. Pero, est&aacute; por definir qu&eacute; es lo que constituye una alteraci&oacute;n    significativa en la delimitaci&oacute;n de los contornos del tumor. Pensamos    que las variaciones interobservador son un factor considerable. De otra parte,    el GTV puede sobreestimarse por inflamaci&oacute;n cr&oacute;nica, neumon&iacute;a    y reacci&oacute;n granulomatosa peritumoral.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Los datos previos    ofrecen suficiente apoyo para la realizaci&oacute;n de estudios prospectivos,    longitudinales multiinstitucionales para la validaci&oacute;n de estos resultados    y la evaluaci&oacute;n del control tumoral, supervivencia, y modificaciones    por el uso del PET.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>La combinaci&oacute;n    de la CT tor&aacute;cica y el PET</b> se ha estudiado recientemente<sup>81</sup>.    Los primeros estudios fueron prometedores. El PET-CT podr&iacute;a minimizar    la dosis de radiaci&oacute;n y el PET en el t&oacute;rax ser&iacute;a igualmente    &uacute;til que el PET corporal.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Aquino y cols.<sup>82</sup>,    demostraron que los resultados mejoraban cuando las im&aacute;genes del PET-CT    se correlacionaban con las im&aacute;genes del CT, y mostraron que los resultados    eran mejores cuando el PET-CT y el CT se fusionaban digitalmente<sup>83</sup>.    El registro de im&aacute;genes del PET y de la CT y la integraci&oacute;n del    PET-CT proporcionan una adecuada fusi&oacute;n de im&aacute;genes e incluso    se espera que una mejor estadificaci&oacute;n del mediastino.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En un estudio de    Cerfolio, el PET-CT proporcionaba mayor precisi&oacute;n en el estudio de la    afectaci&oacute;n ganglionar<sup>84</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Antoch y cols.<sup>85</sup>,    y Lardionois y cols, concluyeron que el PET-CT mejoraba la precisi&oacute;n    diagn&oacute;stica de la estadificaci&oacute;n del CPNM. En contraste, Vansteenkiste<sup>86</sup>    y Magnani no encontraron diferencias significativas en la precisi&oacute;n con    las im&aacute;genes de fusi&oacute;n digital del PET-CT, ni tampoco al analizar    la estadificaci&oacute;n ganglionar ni las distintas cadenas ganglionares linf&aacute;ticas.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Halpern y cols.<sup>87</sup>,    publicaron recientemente que la precisi&oacute;n de las im&aacute;genes del    PET-CT era significativamente mejor que con el PET (p&lt;0.05). Las im&aacute;genes    de fusi&oacute;n obtenidas separadamente del PET y del CT fueron &uacute;tiles    en el 68% de los pacientes.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En nuestro pa&iacute;s,    Pozo-Rodriguez<sup>88</sup> y cols, encontraron que la CT helicoidal y el PET    mostraban similares resultados en la estadificaci&oacute;n mediast&iacute;nica,    ambas pruebas eran condicionalmente dependientes y proporcionaban informaci&oacute;n    complementaria, y su valor diagn&oacute;stico resid&iacute;a principalmente    en los resultados negativos. En este estudio, la sensibilidad y especificidad    de la CT fue 0.86 (95% CI, 0.70 - 0.93) y 0.67 (95% CI, 0.56 - 0.75), y para    el PET de 0.94 (95% CI, 0.81 - 0.98) y 0.59 (95%, 0.49 - 0.68). Para la CT helicoidal    y el PET combinados en paralelo fue de 0.97 (95% CI; 0.84 - 0.99) y de 0.44    (95% CI, 0.34 - 0.53).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">En un estudio con    diferentes tipos de tumores, las im&aacute;genes del PET-CT se compararon en    un an&aacute;lisis por separado con las im&aacute;genes de la CT y del PET.    La combinaci&oacute;n de ambos mejoraba la caracterizaci&oacute;n de las lesiones    equ&iacute;vocas como benignas en un 10% de los sitios y como malignas en un    5%<sup>89</sup>.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Una grave limitaci&oacute;n    es que la mayor&iacute;a de los estudios sobre PET-CT no son comparativos con    PET s&oacute;lo, adem&aacute;s de las graves dificultades metodol&oacute;gicas    para hacer comparaciones, puesto que si hay algo com&uacute;n es la baja calidad    de los estudios publicados.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">As&iacute;, en    Espa&ntilde;a, la Agencia de Evaluaci&oacute;n de Tecnolog&iacute;as Sanitarias    ha realizado una excelente revisi&oacute;n sistem&aacute;tica y un meta-an&aacute;lisis    sobre las indicaciones del PET-CT<sup>90</sup>. De 209 art&iacute;culos seleccionados    inicialmente, s&oacute;lo 16 se pudieron emplear para el metaan&aacute;lisis.    De estos, 12 eran estudios prospectivos y 4 retrospectivos, y exist&iacute;a    gran variedad de tipos de PET-CT, con diferentes tumores estudiados y varias    indicaciones del procedimiento. En el estudio concreto de la estadificaci&oacute;n    del CPNM, el PET-CT aport&oacute; una sensibilidad agregada de 0.85 (IC 95%,    0.74 - 0.92) y una especificidad agregada de 0.84 (IC95%, 0,70 - 0.93). Para    la re-estadificaci&oacute;n tumoral, la sensibilidad de la PET-CT fue de 0.89    (IC 95%, 0.84 - 0.94) y la especificidad de 0.87 (IC 95%, 0.78 - 0.93). Los    autores concluyeron que esta t&eacute;cnica combinada es una tecnolog&iacute;a    &uacute;til en la estadificaci&oacute;n y re-estadificaci&oacute;n tumoral,    porque aumenta el nivel de confianza en el diagn&oacute;stico al disminuir el    n&uacute;mero de lesiones equ&iacute;vocas o no concluyentes. En conclusi&oacute;n,    el PET-CT<sup>91</sup> parece mejor que el CT para el estadificaci&oacute;n    del CPNM y proporciona una mayor precisi&oacute;n y especificidad en la estadificaci&oacute;n    ganglionar.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">A&uacute;n as&iacute;,    como en otros meta-an&aacute;lisis realizados sobre el PET que hemos ido comentando    con anterioridad, llama la atenci&oacute;n la disparidad de los estudios, la    utilizaci&oacute;n de los mismos pacientes para distintas publicaciones, el    car&aacute;cter retrospectivo de muchas de ellas, el escaso nivel de calidad    de gran parte de los estudios realizados y publicados, en algunos no se conoce    ni el g&eacute;nero de los pacientes, mezcla de histolog&iacute;as, ..., as&iacute;    como el posible sesgo de utilizar s&oacute;lo estudios publicados en lengua    inglesa que, por lo general, son aquellos que han proporcionado resultados positivos.</font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">La cuesti&oacute;n    no es balad&iacute;, son numerosos los recursos econ&oacute;micos destinados    a estas exploraciones, adem&aacute;s de las repercusiones diagn&oacute;sticas    y terap&eacute;uticas que pueden generar, sin contar la presi&oacute;n ambiental    por parte de pacientes reclamando pruebas o conclusiones de las mismas que no    siempre pueden ser efectuadas con los datos que disponemos. Por todo ello hay    acuerdo global en reclamar que los estudios sobre test diagn&oacute;sticos,    y, en concreto sobre PET o PET-CT, cumplan con criterios de calidad y control    similares a otros procedimientos de investigaci&oacute;n m&eacute;dica a los    que estamos acostumbrados en el desarrollo de la Oncolog&iacute;a.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b>Agradecimientos</b></font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Realizado gracias    al Convenio de colaboraci&oacute;n del "Instituto Salud Carlos III y "Agencia    La&iacute;n Entralgo" dentro del programa de estabilizaci&oacute;n e intensificaci&oacute;n    de la actividad investigadora del Sistema Nacional de Salud.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="3"><b>Bibliograf&iacute;a</b></font></p>     ]]></body>
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Radiology 2005; 236:1011-9.    </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=4096082&pid=S0378-4835200700030000400091&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-Normal, sans-serif" size="2"><a name="back"></a><a href="#top10"><img src="/img/revistas/onco/v30n3/seta.gif" border="0"></a>    <b>Correspondencia:</b>    <br>   Mariano Provencio    MD, Ph D    <br>   Servicio de Oncolog&iacute;a M&eacute;dica    <br>   Hospital Puerta de Hierro    <br>   San Mart&iacute;n de Porres, 4    <br>   E-28035 Madrid (Spain)    <br>   <a href="mailto:mprovenciop@seom.es">mprovenciop@seom.es</a></font></p>     ]]></body>
<body><![CDATA[ ]]></body><back>
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