<?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>0367-4762</journal-id>
<journal-title><![CDATA[Gaceta Médica de Caracas]]></journal-title>
<abbrev-journal-title><![CDATA[Gac Méd Caracas]]></abbrev-journal-title>
<issn>0367-4762</issn>
<publisher>
<publisher-name><![CDATA[ATEPROCA]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0367-47622017000400003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tratamiento del linfoma difuso de células B grandes (LDCBG) en estadios avanzados]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Müller]]></surname>
<given-names><![CDATA[Aixa]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres]]></surname>
<given-names><![CDATA[María A]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soyano]]></surname>
<given-names><![CDATA[Aixa Elena]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Soyano]]></surname>
<given-names><![CDATA[Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Clínica El Ávila  ]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Clínica Santa Sofía  ]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Clínica Mayo  ]]></institution>
<addr-line><![CDATA[Jacksonville Florida]]></addr-line>
<country>EE.UU</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Instituto Venezolano de Investigaciones Científicas  ]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2017</year>
</pub-date>
<volume>125</volume>
<numero>4</numero>
<fpage>276</fpage>
<lpage>298</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0367-47622017000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0367-47622017000400003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0367-47622017000400003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El linfoma difuso de células B grandes (LDCBG), la forma más común de linfoma no Hodgkin, se clasifica en tres tipos: 1. de células semejantes a las del centro germinal (GCB), 2. de células semejantes a las activadas (ABC), 3. Mediastinal. Se observa reordenamiento de los genes BCL-6, BCL-2 o c-MYC, este asociado a peor pronóstico. El tratamiento de primera línea internacionalmente aceptado es R-CHOP-21 (6 ciclos), con evaluación después de 2-4 ciclos. Puede usarse también R-CHOP-14 y DAEPOCH. Existen opciones de segunda línea (e. g., Bendamustina ± Rituximab o Brentuximab Vedotin) para pacientes en recaída no candidatos a dosis altas de quimioterapia y tratamientos novedosos para los subtipos GCB y ABC. Se revisa el pronóstico molecular y el uso de agentes como Bortezomib (inhibidor proteosómico, más específico y menos tóxico), que proveen una alternativa para pacientes frágiles al R-CHOP, refractarios o recaídas. Se describen las opciones para pacientes con función ventricular reducida, >80 años con comorbilidades, enfermedad del SNC, y para las variedades mediastinal, de la zona gris, doble mutado y testicular.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The Diffuse Large B-Cell Lymphoma (DLBCL), the most common form of Non-Hodgkin Lymphoma, is classified in three types: 1. Germinal Center-Like B Cell (GCB), 2. Activated B Cell-like (ABC), 3. Mediastinal. They show rearrangement of genes BCL-6, BCL-2 and c-MYC (with worse prognosis). The internationally accepted first-line treatment is R-CHOP-21 (6 cycles), with re-staging after 2-4 cycles of R-CHOP-21. R-CHOP-14 and DA-EPOCH may also be used. We describe second-line options for relapses, for patients not candidates for high doses of chemotherapy (e. g., Bendamustine ± Rituximab or Brentuximab Vedotin), novel treatments for the GCB and ABC subtypes. The molecular prognosis and the use of agents such as Bortezomib, a proteosome inhibitor with greater specificity and lower toxicity are reviewed; these provide an alternative for patients fragile to R-CHOP, refractory or relapsing. We also describe options for patients with poor ventricular function, > 80 years of age with comorbidities, CNS disease, and varieties such as Primary Mediastinal, Gray Zone Lymphoma, Double Hit Lymphoma and Primary Testicular Lymphoma.]]></p></abstract>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="Verdana"><b>Tratamiento del linfoma difuso de  células B grandes (LDCBG) en estadios avanzados</b></font></p>     <p align="center"><font face="Verdana" size="2">Drs. Aixa Müller<sup>1</sup>,  María A. Torres<sup>2</sup>, Aixa Elena Soyano<sup>3</sup>, Andrés Soyano<sup>4</sup></font></p>     <p align="justify"><font face="Verdana" size="2"><sup>1</sup> Clínica El Ávila  (Caracas),</font></p>     <p align="justify"><font face="Verdana" size="2"><sup>2</sup> Clínica Santa  Sofía (Caracas),</font></p>     <p align="justify"><font face="Verdana" size="2"><sup>3</sup> Clínica Mayo (Jacksonville,  Florida, EE.UU),</font></p>     <p align="justify"><font face="Verdana" size="2"><sup>4</sup> Instituto  Venezolano de Investigaciones Científicas (Caracas).</font></p>     <p align="justify"><font face="Verdana" size="2"><b>RESUMEN</b></font></p>     <p align="justify"><font face="Verdana" size="2">El linfoma difuso de células B  grandes (LDCBG), la forma más común de linfoma no Hodgkin, se clasifica en tres  tipos: 1. de células semejantes a las del centro germinal (GCB), 2. de células  semejantes a las activadas (ABC), 3. Mediastinal. Se observa reordenamiento de  los genes BCL-6, BCL-2 o c-MYC, este asociado a peor pronóstico. El tratamiento  de primera línea internacionalmente aceptado es R-CHOP-21 (6 ciclos), con  evaluación después de 2-4 ciclos. Puede usarse también R-CHOP-14 y DAEPOCH.  Existen opciones de segunda línea (e. g., Bendamustina ± Rituximab o Brentuximab  Vedotin) para pacientes en recaída no candidatos a dosis altas de quimioterapia  y tratamientos novedosos para los subtipos GCB y ABC. Se revisa el pronóstico  molecular y el uso de agentes como Bortezomib (inhibidor proteosómico, más  específico y menos tóxico), que proveen una alternativa para pacientes frágiles  al R-CHOP, refractarios o recaídas. Se describen las opciones para pacientes con  función ventricular reducida, &gt;80 años con comorbilidades, enfermedad del SNC, y  para las variedades mediastinal, de la zona gris, doble mutado y testicular.</font></p>     <p align="justify"><font face="Verdana" size="2"><b>SUMMARY</b></font></p>     <p align="justify"><font face="Verdana" size="2">The Diffuse Large B-Cell  Lymphoma (DLBCL), the most common form of Non-Hodgkin Lymphoma, is classified in  three types: 1. Germinal Center-Like B Cell (GCB), 2. Activated B Cell-like  (ABC), 3. Mediastinal. They show rearrangement of genes BCL-6, BCL-2 and c-MYC (with  worse prognosis). The internationally accepted first-line treatment is R-CHOP-21  (6 cycles), with re-staging after 2-4 cycles of R-CHOP-21. R-CHOP-14 and DA-EPOCH  may also be used. We describe second-line options for relapses, for patients not  candidates for high doses of chemotherapy (e. g., Bendamustine ± Rituximab or  Brentuximab Vedotin), novel treatments for the GCB and ABC subtypes. The  molecular prognosis and the use of agents such as Bortezomib, a proteosome  inhibitor with greater specificity and lower toxicity are reviewed; these  provide an alternative for patients fragile to R-CHOP, refractory or relapsing.  We also describe options for patients with poor ventricular function, &gt; 80 years  of age with comorbidities, CNS disease, and varieties such as Primary  Mediastinal, Gray Zone Lymphoma, Double Hit Lymphoma and Primary Testicular  Lymphoma.</font></p>      ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana" size="2"><b>INTRODUCCIÓN</b></font></p>     <p align="justify"><font face="Verdana" size="2">Los linfomas son neoplasias de  origen linfoide que se caracterizan por la proliferación anormal de linfocitos B  o T en tejido linfoide típicamente causando linfadenopatías. El linfoma difuso  de células B grandes (LDCBG), es la forma más común de linfoma no Hodgkin (LNH),  dentro de cuyo grupo representa aproximadamente el 30 %. El LDCBG es ligeramente  más frecuente ocurrir en la infancia, su incidencia generalmente aumenta con la  edad, y aproximadamente la mitad de los pacientes tienen más de 60 años de edad.  Es un linfoma agresivo (de rápido crecimiento) que puede surgir en los ganglios  linfáticos o en otras áreas como el tracto gastrointestinal, testículos,  tiroides, piel, mamas, huesos o cerebro. A menudo, el primer signo de LDCGB es  la presencia de linfadenopatías en el cuello, axilas o ingles, con diseminación  hacia el hígado, médula ósea o pulmones. Otros síntomas pueden incluir  sudoración nocturna, fiebre y pérdida de peso inexplicable.</font></p>     <p align="justify"><font face="Verdana" size="2">La sobrevida de los pacientes  con LDCBG ha mejorado con el uso de anticuerpos monoclonales anti-CD20 y la  combinación de drogas antineoplásicas, por lo que es indispensable conocer y  aplicar a los pacientes con linfoma los tratamientos actualizados para aumentar  la sobrevida global y disminuir la sobrevida libre de progresión (1-5).</font></p>     <p align="justify"><font face="Verdana" size="2">El objetivo de este trabajo es  presentar una revisión actualizada del tratamiento del LDCBG en los estadios  avanzados III y IV. En los últimos años ha habido un importante avance en el  conocimiento de la heterogeneidad biológica de esta enfermedad y la introducción  de la inmunoterapia ha mejorado la supervivencia. Por un lado, los estudios de  expresión génica han puesto de manifiesto la existencia de distintas formas  moleculares del LDCBG con diferentes comportamiento y pronóstico. Por otro lado,  la combinación de la quimioterapia convencional con el anticuerpo anti-CD20 (Rituximab),  ha mejorado sustancialmente los resultados terapéuticos. Recientemente, los  estudios de expresión génica no solo han aportado información relevante para el  pronóstico, sino que han permitido identificar nuevas dianas terapéuticas. Y así  están en desarrollo nuevos fármacos para situaciones de refractariedad o  recidiva, que además se están incorporando en primera línea en las estrategias  para tratar a pacientes de alto riesgo (6).</font></p>     <p align="justify"><font face="Verdana" size="2"><b>Evaluación del paciente con  linfoma al diagnóstico</b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Debe  realizarse examen físico con especial atención en las áreas de linfadenopatías  que incluyan el anillo de Waldeyer, bazo e hígado, estado clínico del paciente (performance  status, PS) y síntomas B (fiebre, pérdida del 10 % del peso corporal,  sudoraciones nocturnas). Laboratorio: Hematología completa (HC) con recuento  diferencial, química sanguínea completa con ácido úrico, LDH, determinación de  beta-2-microglobulina, serología para virus de la hepatitis B (VHB) y serología  para virus de inmunodeficiencia adquirida (VIH). Adicionalmente, prueba de  embarazo en mujeres en edad reproductiva. Tomografía axial computarizada (TAC)  de tórax, abdomen y pelvis con contraste o PET/CT a cuerpo entero. Biopsia de  médula ósea (con tamaño de &#8805;1,6 cm) con o sin aspirado (puede no ser necesaria  si el PET/CT es negativo). </span> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> Cálculo del Índice pronóstico internacional (IPI score). </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> Ecocardiograma o ventriculografía isotópica (MUGA, del inglés </span><i> <span style="font-size: 10.0pt; font-family: Times-Italic; color: black"> multigated acquisition</span></i><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">),  si están indicados regímenes con antracíclicos. En casos seleccionados, TAC de  cráneo o resonancia magnética nuclear (RMN). Punción lumbar (PL) en casos con  enfermedad en senos paranasales, paladar duro, órbita, testículo, región  epidural, masas paravertebrales, médula ósea positiva, linfoma asociado a VIH,  afectación de dos o más regiones extranodales, LDH elevada. Los pacientes con  alta carga tumoral y LDH elevada deben ser evaluados para el síndrome de lisis  tumoral espontánea, incluyendo mediciones del ácido úrico. Se recomienda la  realización de pruebas de virus de la hepatitis B debido al aumento de los  riesgos de reactivación viral cuando se están considerando la aplicación de  inmunoterapia. En algunos casos realizar discusión de fertilidad y almacenar  espermatozoides en el banco de esperma. Realizar punción lumbar si los senos  paranasales, testículo, médula ósea están infiltrados por células grandes, si el  linfoma está asociado a VIH, tiene &#8805; 2 sitios extranodales afectados y LDH  elevada (7).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Características morfológicas</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">El LDCBG  es una neoplasia de células B que se subdividen en variantes morfológicas,  subgrupos inmunofenotípicos, moleculares y entidades distintivas, quedando un  grupo sin características propias llamado NOS (en inglés </span><i> <span style="font-size: 10.0pt; font-family: Times-Italic; color: black">not  otherwise specified</span></i><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">;  en español, </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">no  especificado). </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Puede  presentarse </span><i> <span style="font-size: 10.0pt; font-family: Times-Italic; color: black">de novo </span></i><span style="font-size: 10.0pt; font-family: Times-Roman">o por  transformación de un LNH de células pequeñas. Se caracteriza por una  infiltración difusa que borra completa o parcialmente la arquitectura  interfolicular o sinusoidal. Las variantes morfológicas son: </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold">Centrobla&#769;stico, </span> </b><span style="font-size: 10.0pt; font-family: Times-Roman">el más común, con  células linfoides medianas a grandes de escaso citoplasma, cromatina fina,  núcleos vesiculosos con dos a cuatro nucléolos apoyados en la membrana nuclear;  en algunos casos pueden presentar múltiples lóbulos y más del 90 % de  inmunoblastos con un marcado polimorfismo. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold">Inmunobla&#769;stico, </span> </b><span style="font-size: 10.0pt; font-family: Times-Roman">son tumores con  mas del 90 % de inmunoblastos (son células grandes con citoplasma basófilo,  núcleo vesiculoso y nucléolo central prominente; debe diferenciarse del linfoma  plasmobla&#769;stico y del plasmocitoma plasmobla&#769;stico) y tienen peor pronóstico. </span><b><span style="font-size: 10.0pt; font-family: Times-Bold">Anapla&#769;sico, </span></b><span style="font-size: 10.0pt; font-family: Times-Roman">con células  que infiltran los sinusoides o se presentan en forma cohesiva simulando  metástasis; son de gran tamaño, con abundante citoplasma y núcleos bizarros que  remedan células de Reed-Sternberg (RS) o linfoma anapla&#769;sico, pero no están  relacionados clínica ni biológicamente con estos últimos, cuyas células son  linfocitos T citoto&#769;xicos. Tampoco se relaciona con los LDCBG ALK positivos (8).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Características inmunofenotípicas</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">El LDCBG  expresa los marcadores B CD19, CD20, CD22, CD79a, inmunoglobulina de superficie  (Igs) o citoplasmática (Igc). El CD30 es positivo en el LDCBG anapla&#769;sico. Un 10</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: white">.</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">%  expresa CD5, y se distinguen del linfoma del manto variante blastoide por la  ausencia de ciclina 1 (CCD-1). Los LDCBG expresan CD10 en 30</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: white">.</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">%-60  % de los casos, BCL-6 en 60 %-90</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: white">.</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">%,  MUM-1 en 35 %-65 % y BCL-2 en 50 %. El índice de proliferación expresado por el  antígeno Ki 67 (una proteína nuclear que esta asociada a la proliferación  celular y transcripción del RNA ribosómico y que es un marcador celular para  proliferación puede estar elevado; en general, mayor de 40 %, aunque en  variantes de alta proliferación supera el 90 % (9,10)</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">La  clasificación del LDCBG revisada y actualizada en el 2016 por la OMS con  implicaciones diagnósticas, pronósticas y terapéuticas se presenta </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">en el  <a href="#cua1">Cuadro 1</a> (4). Esta clasificación tomó en cuenta los estudios de perfiles de  expresión génica realizados con la técnica de microarreglos del ADN que han  revelado una heterogeneidad significativa dentro de los LDCBG (10).</span></font></p>     <p style="text-align: center; text-autospace: none"><a name="cua1"> <img border="0" src="/img/fbpe/gmc/v125n4/art03cua1.gif" width="273" height="378"></a></p>     
<p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">Para  determinar el estadio clínico del paciente con LDCBG se utiliza la clasificación  de Ann Arbor, modificada y presentada en Lugano, 2014</span><span style="font-family: Times-Roman; color: white"><font size="2">&amp;</font></span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">(11,12). </span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> Véase <a href="#cua2">Cuadro 2</a>. Esta clasificación de estadiaje clínico está diseñada para  identificar todos los sitios de enfermedad conocida y así determinar el  pronóstico clínico, junto con los factores de riesgo clínico a través del índice  internacional IPI (13).</span></font></p>     <p style="text-align: center; text-autospace: none"><a name="cua2"> <img border="0" src="/img/fbpe/gmc/v125n4/art03cua2.gif" width="575" height="284"></a></p>     
<p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Factores  pronósticos clínicos</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Se han  elaborado diversos índices pronósticos que clasifican a los linfomas de acuerdo  con el riesgo, en bajo, bajo intermedio, alto intermedio y alto, que intentan  predecir la posible evolución y duración de la enfermedad, de tal manera que  pueda seleccionarse el tratamiento más adecuado. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">El  estadiaje clínico </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">evalúa t</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">odos  los sitios de enfermedad conocida y determina el pronóstico clínico a través del  Índice Internacional </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #262626">IPI </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">que  aparece en el <a href="#cua3">Cuadro 3</a>. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Se  publicó en 1993 y </span> <span style="font-size: 10.0pt; font-family: Times-Roman">se desarrolló a partir  de diversas reuniones de consenso. Para el cálculo del IPI se le asigna 1 punto  a cada uno de las variables (14). La utilidad de este sistema fue demostrada en  pacientes adultos con LDCBG con estadios avanzados y tratados con los antiguos  esquemas de poliquimioterapia CHOP o regímenes similares. La validez del IPI ha  sido verificada para el LDCBG con los tratamientos actuales con la combinación  de inmunoquimioterapia Rituximab–CHOP (R-CHOP), tanto en casos avanzados como en  localizados. La medición del IPI también es útil en estimar el pronóstico en el  caso de una recaída del linfoma y en predecir la supervivencia tras el  tratamiento de rescate (15).</span></font></p>     <p style="text-align: center; text-autospace: none"><a name="cua3"> <img border="0" src="/img/fbpe/gmc/v125n4/art03cua3.gif" width="525" height="115"></a></p>     
<p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626"> Posteriormente se creó un </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #262626">Índice  de pronóstico internacional ajustado a la edad </span> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> denominado AAIPI </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">que es  una modificación que simplifica el IPI para pacientes jóvenes al eliminar la  edad y el número de localizaciones extraganglionares e incluye solo los factores  pronósticos: estadio clínico, estado general y concentración de LDH, agrupando  en cuatro los grupos pronósticos.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Con el  IPI y el AAIPI se definieron 4 grupos de riesgo según la puntuación obtenida que  identifican </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">un  grupo específico de pacientes que tienen más o menos probabilidades de ser  curados con la terapia estándar. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">La  clasificación de los pacientes con linfoma según el </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">IPI store </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">y el </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">AAIPI </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">serían </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">Riesgo  Bajo (0-1 punto), Riesgo Bajo Intermedio (1-2 puntos), Riesgo Alto Intermedio  (2-3 puntos ) y Riesgo Alto (3-5 puntos). Los porcentajes de respuesta completa  (RC) y de sobrevida global (SG) a los 5 años son 87 %-92 % y 73 %-83 %,  respectivamente para el grupo de Riesgo Bajo contra 44 %-46 % y 26 %-32 % para  el grupo de Riesgo Alto </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">(14).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Los  pacientes tratados con el anticuerpo monoclonal anti-CD20 o Rituximab tienen una  sobrevida libre de progresión (SLP) de 50 % aproximadamente cuando tienen 4 a 5  factores pronósticos y de 90 % cuando no tienen presentes factores pronósticos  adversos. Otros factores pronósticos adversos son diámetro tumoral más de 10 cm,  sexo masculino (estos depuran el Rituximab más rápido que las mujeres),  infiltración de la médula ósea (15).</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Sehn y  col. realizaron un análisis retrospectivo de 365 pacientes con LDCBG de novo  tratados con rituximab y quimioterapia estándar. En este estudio se  redistribuyeron los factores del IPI en 3 grupos del denominado IPI revisado (R-IPI).  Los pacientes con 0 factores tuvieron &gt;90 % a los 4 años de supervivencia libre  de progresión (SLP); los que tenían 1-2 factores tuvieron una SLP aproximada de  80 % y en aquellos con &#8805;3 la SLP fue del 50 % (16).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">Zhuo y  col. reportaron otro Índice pronóstico (NCCN-IPI) que también estratifica a los  pacientes con LDCBG tratados con Rituximab </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">en </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">4  diferentes grupos de riesgo: Bajo, Bajo intermedio, Alto intermedio y Alto,  basado en cambios clínicos como la edad, de manera más específica (&gt;40 años a 60  años; &gt;60 años a 75 años y &gt;75 años), LDH, sitios de afección extraganglionar,  estadio clínico (Ann Arbor) y PS (ECOG). Este índice parece discriminar mejor a  pacientes de Bajo y Alto riesgo con tasas de SG a los 5 años de 6 % vs. 33 % que  el IPI store previo con SG a los 5 años de 90 % vs. 5 4 %, respectivamente (7).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Factores  pronósticos biológicos</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Los  estudios de perfil de la expresiónn génica realizado con técnicas de  microarreglos del ADN han permitido la clasificación de LDCBG en 3 subtipos  diferentes: 1. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Linfoma  difuso de células B semejantes a las del centro germinal (en inglés denominados </span><i> <span style="font-size: 10.0pt; font-family: Times-BoldItalic; color: black">GCB-like</span></i><span style="font-size: 10.0pt; font-family: Times-Bold; color: black">), </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">se  originan del centro germinal de células B y </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #111111"> asemejan a las células B normales del centro germinal, y generalmente se asocian  con un pronóstico favorable; </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">2. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Linfoma  difuso de células similares a la célula B activadas (</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">variante </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">ABC)</span><i><span style="font-size: 10.0pt; font-family: Times-BoldItalic; color: black">, </span></i></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">se  originan del pos centro germinal de células B, son detenidas en su maduración  durante la diferenciación plasmática, </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #111111">tienen  peor pronóstico y su nombre deriva de los estudios que </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">muestran  la activación continua de ciertas vías implicadas en la activación normal de las  células B por un antígeno; y 3. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Linfoma  primario mediastinal de células B (LPMB), </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">puede  definirse como una entidad clínica cuyo sitio primario de enfermedad es el  mediastino con o sin otros sitios y con histología de LDCBG. Es s</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">imilar  al linfoma de Hodgkin nodular esclerosante que surge en el mediastino, y es  probable que se derive de una célula B tímica y se presenta típicamente en  adolescentes y adultos jóvenes con una masa mediastinal anterior, que puede  invadir estructuras locales. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">El LPMB  se superpone con el linfoma de zona gris que tiene características intermedias  entre el linfoma de Hodgkin y LPMB presentando características únicas de  diagnóstico y tienen un perfil de expresión génica superponible al linfoma de  Hodgkin (17,18).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Esos  subtipos difieren en la expresión de </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> numerosos genes, tienen diferentes tasas de sobrevida </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">con </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">el  tratamiento. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Los  subtipos de linfoma difuso GCB, ABC y LPMB son entidades clínico-biolo&#769;gicas  diferentes, con mutaciones y activacio&#769;n de vías intracelulares diferentes. Por  ejemplo, la traslocacio&#769;n BCL-2 es ma&#769;s frecuente en el subtipo GCB y la  traslocacio&#769;n BCL-6 ma&#769;s frecuente en el subtipo ABC. La activacio&#769;n del factor  de transcripcio&#769;n NF-kB se presenta con ma&#769;s frecuencia en el subtipo ABC y en  el LBPM, aunque la implicacio&#769;n en cada uno de estos u&#769;ltimos es diferente (19).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Dada la  dificultad de la realización en la práctica de los estudios de expresión génica,  se han investigado y validado patrones de inmunohistoquímica que se  correlacionan con los diferentes subtipos biológicos de LDCBG. Así el algoritmo  de Hans y col. utiliza CD20, CD10, Bcl-6 y MUM-1 (20) y el de Choi y col.  utiliza GCET1, CD10, BCL-6, MUM1 y FOXP1 y tiene concordancia con la expresión  génica del 93 %</span><span style="font-family: Times-Roman; color: white"><font size="2">&amp;</font></span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(21). </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">Con  inmunohistoquímica los LDCBG han sido clasificados en 2 subtipos, GCB </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(CD10+,  o BCL6+, IRF4/MUM1-) y no GCB (CD10-, IRF4/MUM1+ o BCL6-, IRF4/MUM1-) (20).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">Los  linfomas difusos GCB y LBPM responden favorablemente al tratamiento  convencional. Por el contrario los linfomas difusos ABC representan el subtipo  menos curable y menos del 50 % de los pacientes son curados. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">De  manera independiente del IPI, los subtipos GCB y ABC definidos por el patrón  inmunohistoquímico tuvieron diferencias significativas en sobrevida libre de  enfermedad (SLE) y sobrevida global (SG). </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">En la  era pre-rituximab, la sobrevida promedio a 5 años asociada con el tipo de GCB  fue del 60 % frente al 35 % para el tipo ABC; con la adición de rituximab a la  terapia estándar, la supervivencia a los 5 años es de 87 % a 92 % para el tipo  de GCB y 44 % para el tipo de ABC </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> (22,23).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Aunque  el subtipo de linfoma difuso GCB está asociado con un mejor resultado al  tratamiento en comparación con el subtipo ABC, el tratamiento sigue siendo el  mismo para los subtipos y la célula de origen no debe utilizarse para guiar la  selección de la terapia por ahora según el NCCN 2016 (24).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">El  LDCBG con presencia </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">dual de  los reordenamientos MYC and BCL2 son conocidos como </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Linfomas  doble hit o doble mutados </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">y están  caracterizados por ser muy agresivos y </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121"> presentar superposición de características patológicas con el linfoma de Burkitt,  el linfoma /leucemia linfoblástica B. Los pacientes con estos linfomas suelen  tener pronóstico pobre, incluyendo estadios avanzados, niveles elevados de LDH,  infiltración de la médula ósea, sitios extraganglionares múltiples y afectación  del SNC </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">y un  alto puntaje de IPI.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Se han  observado linfomas “doble mutados” en 2 %-11 % de los pacientes recién  diagnosticados con LDCBG. Los pacientes con linfomas “doble mutados” tienen  resultados clínicos extremadamente pobres con una sobrevida media de un año,  incluso con quimio-inmunoterapia que contiene Rituximab o terapia intensiva con  trasplante de células madres. Basados en los hallazgos anteriores a los  pacientes con LDCBG debe pedírseles MYC y BCL-2.</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">El  origen celular del Linfoma difuso CGB o ABC y la presencia de doble mutación MYC  y BCL-2 tienen valor pronóstico independiente, sin embargo, en términos  prácticos, el IPI store es el de mayor valor práctico (17,25).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">En  resumen entre los factores pronósticos del LDCBG tenemos </span><i> <span style="font-size: 10.0pt; font-family: Times-Italic; color: black">1. </span></i><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Clínicos</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">:  siendo el índice pronóstico internacional IPI, la herramienta clínica más  importante, de fácil aplicabilidad y extensamente validada, antes y luego de la  utilización del anticuerpo monoclonal anti-CD20 como tratamiento. </span><i> <span style="font-size: 10.0pt; font-family: Times-Italic; color: black">2. </span></i><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Biológicos</span></b><i><span style="font-size: 10.0pt; font-family: Times-Italic; color: black">: </span></i> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">la  presencia del reordenamiento de c-MYC se asocia a peor pronóstico, con respuesta  disminuida a la quimioterapia e inmunoquimioterapia y autotrasplante (26,27).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Características genéticas</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Se  detectan en estos LDCBG reordenamientos clonales de genes de inmunoglobulina  tales como reordenamiento de BCL-2 ~ 20 %, y reordenamiento de BCL-6 ~ 30 %.  Mutación de BCL-6 ~ 70 %. Reordenamiento de MYC: 9-17 % y el virus Epstein-Barr  usualmente negativo (10).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Pronóstico molecular de los pacientes con LDCBG</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b><i> <span style="font-size: 10.0pt; font-family: Times-BoldItalic; color: black">BCL-2 </span></i></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">es una  proteína antiapoptótica </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">que es  importante en el desarrollo y diferenciación de las células B. La sobreexpresión  de BCL2 ha sido reportada en el 40 %-60 % de los LDCBG y ha sido asociada con </span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> pobre sobrevida</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">,  sin embargo la adición de Rituximab al tratamiento de quimioterapia en estos  pacientes mejoró la sobrevida, implicando que el Rituximab disminuyó la  influencia negativa de la sobreexpresión del gen BCL-2. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Cuando  se determinó la expresión de BCL-2 en el linfoma del centro germinal de células  B (GCB) fue predictivo de mal pronóstico pero no sucedió así en el subtipo de  células B activadas (ABC). El reordenamiento del oncogén MYC es la  característica del linfoma de Burkitt y puede </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">ser  identificado en el 5 %-10 % de los pacientes con LDCBG típicos. La  sobreexpresión de la oncoproteína MYC promueve el crecimiento celular y  proliferación. Varios estudios recientes han encontrado la presencia de arreglos  MYC asociados con pobres resultados en pacientes con LDCBG tratados con R-CHOP,  con SLP a los 3 años en el rango de 30 %-35 %, lo cual es la mitad de lo visto  en los pacientes sin el rearreglo MYC. El impacto negativo del rearreglo MYC fue  independiente del IPI y en un estudio fue asociado con alto riesgo de recaída en  SNC (29,30)</span><b><i><span style="font-size: 10.0pt; font-family: Times-BoldItalic; color: #191919">.</span></i></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Valor  prono&#769;stico del PET en el LDCBG</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Las  imágenes funcionales con tomografía de emisión de positrones con fluorin18  2-fluoro-2-deoxy-D-glucosa (FDG-PET) constituyen una nueva herramienta para  evaluar la respuesta y predecir el pronóstico de los linfomas. En 2007 se  publico&#769; la revisión de los criterios internacionales de respuesta de los  linfomas, que recomendó realizar PET en linfomas con avidez por FDG, como el  LDCBG para:</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> Evaluacio&#769;n inicial para mejorar el estudio de extensio&#769;n.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Seis a  ocho semanas después de finalizar el tratamiento y es valor predictivo.</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">En  ensayos clínicos, a mitad de tratamiento para evaluar la capacidad del PET para  predecir respuesta y supervivencia</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Algunos  estudios han demostrado el valor pronóstico del PET precoz después del 3 o 4  ciclos de quimioterapia, así, Dupuis J. y col. encontraron la SLP a los 5 años  de 36 % en pacientes con PET interino positivo vs 80 % en aquellos con PET  negativo (31,32).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Tratamiento de quimioterapia de primera línea  para pacientes con LDCBG</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> Quimioterapia estándar de primera línea para los LDCBG estadíos III y IV</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-CHOP-</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">21 </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">(</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Rituximab,  Ciclofosfamida, Doxorubicina, Vincristina, Prednisona), ciclos cada 21 días</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-CHOP  Dosis Densa (CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">-14</span><b><span style="font-size: 10.0pt; font-family: Times-Bold; color: black">) </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">es el mismo  esquema de R-CHOP pero los ciclos se aplican  cada 14 días</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">EPOCH  dosis ajustadas DA-EPOCH (</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Etopósido,  Prednisona, Vincristina, Ciclofosfamida, Doxorubicina.)</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana">     <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">El      esquema de quimioterapia </span><b>     ]]></body>
<body><![CDATA[<span style="font-size: 10.0pt; font-family: Times-Bold; color: black">CHOP     </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Ciclofosfamida,      Doxorubicina, Vincristina y Prednisona) curó aproximadamente el 30 % de los      pacientes con estadios avanzados de linfoma no Hodgkin de grado intermedio o      avanzado y </span>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">fue la      combinación de quimioterapia estándar durante 25 años (33,34). Fisher y col.      demostraron en 1993 que otros regímenes de combinación de quimioterapia como     </span><b>     ]]></body>
<body><![CDATA[<span style="font-size: 10.0pt; font-family: Times-Bold; color: black">m-BACOD     </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Metotrexate,      Bleomicina, Doxorubicina, Ciclofosfamida, Vincristina y Dexametasona), o </span>     <b><span style="font-size: 10.0pt; font-family: Times-Bold; color: black">     ProMACECytaBOM </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Ciclofosfamida,      Doxorubicina, Etopósido, Citosar, Bleomicina, Vincristine, Metotrexate y      Prednisona) y </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">MACOP-B     ]]></body>
<body><![CDATA[</span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Metotrexate      con rescate de Leucovorina, Doxorubicina, Ciclofosfamida, Vincristina,      Prednisona, y Bleomicina no fueron superiores a </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">CHOP     </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">y la      toxicidad fue mayor (35)</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">.      La incorporación del anticuerpo monoclonal anti-CD20 (</span><b><span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">Rituximab)     </span></b>     ]]></body>
<body><![CDATA[<span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">al      esquema d</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">e     </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">CHOP     </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">     denominándolo abreviadamente </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-CHOP     </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">mejoró      ]]></body>
<body><![CDATA[los resultados de todos los pacientes con LDCBG, solo la mitad a un tercio de      los pacientes mueren de su LDCBG en comparación con la era pre-rituximab (1).      Coffier demostró en pacientes &#8805; 60 años con LDCBG en estadio avanzado una      mejoría del 16 % de la sobrevida global (SG) a los 10 años con la adición del     </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Rituximab     </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(36,      37). </span>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">Otros      ]]></body>
<body><![CDATA[estudios confirmaron el beneficio del </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">R-CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">-21,      reportando Habermann y col. la sobrevida libre de progresión (SLP) para      pacientes &#8805; 60 años con LDCBG en </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">R-CHOP-</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">21      de 53 % vs 46 % para </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">-21      (P=0,04) </span>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: #312A2A">a los      3,5 años y la SLP fue de 76 % a los 2 años para los que recibieron mantenimiento      ]]></body>
<body><![CDATA[con Rituximab vs 61 % para los pacientes que solo se observaron (</span><i><span style="font-size: 10.0pt; font-family: Times-Italic; color: #312A2A">P     </span></i>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: #312A2A">=      0,009). No hubo diferencias en SG en ambos grupos y la SLP fue prolongada con     </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #312A2A">     Rituximab </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: #312A2A">de      mantenimiento después de </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #312A2A">CHOP     ]]></body>
<body><![CDATA[</span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: #312A2A">-21 (P      = 0,004) pero no después de </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #312A2A">R-CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #312A2A">-21      (P = 0,81) con una tasa de SLP a los 2 años de 77 % para </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #312A2A">R-CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #312A2A">-21,      79 % para R-CHOP-21 + mantenimiento con </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #312A2A">     Rituximab </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: #312A2A">(</span><b><span style="font-size: 10.0pt; font-family: Times-Bold; color: #312A2A">MR</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #312A2A">),      ]]></body>
<body><![CDATA[74 % para </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #312A2A">CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #312A2A">-21     </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #312A2A">+ MR     </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: #312A2A">y 45 %      para </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #312A2A">CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #312A2A">-21     </span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">     (38). </span>     ]]></body>
<body><![CDATA[<span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">Otros      estudios adicionales confirmaron el beneficio de </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">     Rituximab </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">y      establecieron el </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">R-CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">-21      como la terapia </span>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">estándar     </span>     ]]></body>
<body><![CDATA[<span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">de      inducción para el LDCGB y que hasta la fecha </span>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">no hay      ventajas con </span><b>     <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Rituximab     </span></b>     <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">de      mantenimiento (16,17,39,40).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">1.  Quimioterapia de primera línea para LDCBG estadíos III y IV con R-CHOP-21</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-CHOP-</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">21  x 6 ciclos es el tratamiento estándar para los LDCBG en estadios avanzados III y  IV. Reestadiar después de 2 a 4 ciclos de </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">-21  con tomografía axial computarizada (TAC) para confirmar la respuesta. Se conoce  que el CT-PET interino puede conducir a falsos positivos y debe ser considerado  en casos seleccionados con precaución. Si el CT- PET interino es positivo  rebiopsiar antes de cambiar el tratamiento. Si la enfermedad respondió continuar </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">-21  hasta completar 6 ciclos.</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: center; text-autospace: none"> <img border="0" src="/img/fbpe/gmc/v125n4/art03cua4.gif" width="559" height="398"></p>     
<p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Seguimiento del paciente después de haber recibido 6 ciclos de R-CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">-21.  Repetir todos los estudios positivos; si la respuesta es completa con PET  negativo observe o considere en pacientes de alto riesgo radioterapia a  enfermedad voluminosa inicial. Si la respuesta de tratamiento se evalúa por  tomografía axial computarizada (TAC), y resulta negativa pero el paciente debutó  con enfermedad voluminosa inicial (&gt;10 cm), debe recibir radioterapia (RT) de  consolidación a la zona anatómica de enfermedad voluminosa previa o altas dosis  de quimioterapia con trasplante autólogo de células madres como rescate. Repetir  la biopsia en el sitio anatómico de hipercaptación patológica en el CT-PET antes  de la terapia adicional es prioridad si el PET era positivo, pero lo ideal es  documentar la persistencia de LDCBG con realización de biopsia diagnóstica. Si  la biopsia es negativa proseguir como si el PET fuese negativo</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: red">.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Seguimiento clínico del paciente después de haber entrado en remisión completa. </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Realizar  hematologías y laboratorio cada 3 a 6 meses </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">por 5  años </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> incluyendo la cuantificación de la lactato deshidrogenasa (LDH) </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">y  luego anual o de acuerdo a lo que la clínica indique. Indicar </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> tomografia axial computarizada (TAC) </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">solo  cada 6 meses por 2 años después de completado el tratamiento y luego cuando la  clínica lo indique. Si el paciente recae, administrar el tratamiento para LDCBGB  refractario.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Si  después de los 6 ciclos de R-</span><b><span style="font-size: 10.0pt; font-family: Times-Bold; color: black">CHOP-</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">21  la respuesta es parcial (PET positivo) o no responde, administrar tratamiento de  rescate como paciente primario refractario o radioterapia paliativa en casos  seleccionados que no sean candidatos para quimioterapia (17,24).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">2.  Quimioterapia de primera línea para LDCBG estadíos III y IV con dosis densa CHOP  14 + Rituximab</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">El  Grupo Alemán de Estudio para el Linfoma no Hodgkin de Alto Grado en el 2008  demostró en 1 222 pacientes adultos mayores con Linfomas de células B agresivos  que la SLP a los 3 años fue de 47,2 % después de 6 ciclos de </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">CHOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">-14  y de 53 % después de </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">8  ciclos de </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">C</span><b><span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">HOP</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">-14,  y de 66 % después de 6 ciclos de </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">R-CHOP-</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">14  y de 63 % después de </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">8  ciclos de R-CHOP-14</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">.  La SG a los 3 años fue 68 % después de 6 ciclos de </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">CHOP-14 </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">y de  66 % después de 8 ciclos de </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">CHOP-14</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">, </span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> 78,1 % después de 6 ciclos de </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-CHOP-14</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">,  72 % después de 8 ciclos de </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-CHOP-14 </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(41).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">La SLP  y SG mejoraron significativamente con </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">6  ciclos de R-CHOP-14 </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">y </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> administrar </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">8  ciclos de R-CHOP-14 </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">no se  justifica, de tal modo que ocho ciclos de R-CHOP-14 no es mejor que seis ciclos.  Cunningham y col. de la </span><i> <span style="font-size: 10.0pt; font-family: Times-Italic; color: #191919">Royal  Mariden NHS Foundation Trust </span></i> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">de  Londres demostraron en 1 080 pacientes con LDCGB de novo en el año 2013 que el  R-CHOP-14 no es superior al R-CHOP-21 (42).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">El  Grupo Español de Leucemia y Trasplante estudió el R-CHOP 14 como quimioterapia  de primera línea en 120 pacientes con LDCBG y encontraron que la SLP fue de 53,8  % en pacientes </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">&#8805;65 años  y de 71,0 % en &lt;65 años a los 5 años con un seguimiento de 63,7 meses. La SG fue  de 71,4 % y 89,8 %, respectivamente. La tasa de remisión completa fue de 69,9 %  para los mayores y 80,4 % para los pacientes mas jóvenes (43).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">3.  Quimioterapia de primera línea para los LDCBG estadíos III y IV con dosis  ajustadas de EPOCH</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">El grupo  español Pethema encontró en pacientes con LDCBG tratados con dosis ajustadas de  EPOCH más Rituximab (</span><b><span style="font-size: 10.0pt; font-family: Times-Bold; color: black">DA-EPOCH-R</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">)  una SLP de 47,8 % y SG de 63,6 %, después de un seguimiento de 64 meses (44).  Otros autores también han trabajado con EPOCH</span><span style="font-family: Times-Roman; color: white"><font size="2">&amp;</font></span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(45,46).</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">García  Suarez y col. en 31 pacientes con LDCBG de mal pronóstico evaluaron el </span> <b><span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">-</span><b><span style="font-size: 10.0pt; font-family: Times-Bold; color: black">DAEPOCH </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">y  encontraron una SLP de 68 %. Se han reportado excelentes resultados con </span> <b><span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> R-EPOCH</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">,  y se esta llevando a cabo en un estudio comparando </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-EPOCH </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">con </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-CHOP </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(47).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Tratamiento de consolidación de primera línea</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">El  trasplante autólogo de médula ósea (opcional) debe considerarse en paciente &lt;65  años y con IPI de alto riesgo. La terapia de dosis alta de quimioterapia con  rescate autólogo de células madre permanece problemática, sin embargo</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">,  un informe reciente del Estudio Intergrupal de EE.UU y Canadá encontró una  sobrevida libre de enfermedad (75 % vs 41 %) y sobrevida global (82 % vs 64 %)  para pacientes con IPI alto que recibieron trasplantes en remisión completa o  remisión parcial después de 6 ciclos de R-CHOP frente a los que recibieron 8  ciclos de R-CHOP (48,49).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Quimioterapia de segunda línea y subsiguientes para el LDCBG en recaída</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">1. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">DHAP </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Dexametasona,  Cisplatino, Citarabina) ± Rituximab (50,51).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">2. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">ESHAP </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Etopósido,  Metilprednisolona, Citarabina, Cisplatino) ± Rituximab (52,53).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">3. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">GDP </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Gemcitabina,  Dexametasona, Cisplatino) ± Rituximab o (Gemcitabina, Dexametasona, Carboplatino)  ± Rituximab (54,55).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">4. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">GEMOX </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Gemcitabina,  Oxaliplatino) ± Rituximab (56).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">5. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">ICE </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Ifosfamida,  Carboplatino, Etopósido) ± Rituximab (57,58).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">6. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">MINE </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Mesna,  Ifosfamida, Mitoxantrona, Etopósido) ± Rituximab (59). (Véase <a href="#cua5">Cuadro 5</a>).</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: center; text-autospace: none"><a name="cua5"> <img border="0" src="/img/fbpe/gmc/v125n4/art03cua5.gif" width="572" height="721"></a></p>     
<p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Quimioterapia de segunda línea para pacientes con LDCBG que no son candidatos  para quimioterapia a dosis alta</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">1. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919"> Bendamustina ± Rituximab </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> (60-62).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">2. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919"> Brentuximab Vedotin </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">para  la enfermedad CD30 + (63)</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">3. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">CEPP </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> (Ciclofosfamida, Etopósido, Prednisona, Procarbazina) ± Rituximab (64).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">4. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">CEOP </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> (Ciclofosfamida, Etopósido, Vincristina, Prednisona ± Rituximab) (65).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">5. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">DA-  EPOCH ± Rituximab </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> (66,67)</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">6. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">GDP ±  Rituximab </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> (Gemcitabina, Dexametasona, Carboplatino) ± Rtuximab (68).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">7. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">GEMOX ±  Rituximab </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (Rituximab, Gemcitabine, Oxaliplatino) (69).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">8. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> Lenalidomida ± Rituximab (70-72), Rituximab </span> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> como monoterapia (73), R-DHAP (74) (<a href="#cua6">Cuadro 6</a>).</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: center; text-autospace: none"><a name="cua6"> <img border="0" src="/img/fbpe/gmc/v125n4/art03cua6.gif" width="573" height="394"></a></p>     
<p style="text-align: center; text-autospace: none"> <img border="0" src="/img/fbpe/gmc/v125n4/art03cua6b.gif" width="574" height="709"></p>     
<p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Tratamientos novedosos basados en estudio molecular del LDCBG</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Se han  desarrollado agentes novedosos con especificidad tumoral más alta y toxicidad  generalizada más baja, que proveen una alternativa inicial para pacientes  frágiles al R-CHOP y para los pacientes refractarios o en recaída.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">El  LDCBG subtipo ABC tiene una sobrevida reducida después de la quimioterapia y se  caracteriza por la activación constitutiva de la vía del Factor Nuclear  Antiapoptótico-kappa B (NF-&#954;B), que puede inhibir la quimioterapia. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #282828"> Dunleavy y col. postularon que </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">la  inhibición de NF-&#954;B podría sensibilizar al LDCBG subtipo ABC a la quimioterapia  pero no al subtipo GCB y mejorar el resultado del tratamiento en el LDCBG  subtipo ABC (76). </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">El  proteosoma 26S es un complejo proteico de gran taman&#771;o que degrada a la  ubiquitina. La vía ubiquitina-</span><span style="font-size: 10.0pt; font-family: Times-Roman">proteosoma  desempen&#771;a un papel esencial en la secuencia de recambio de determinadas  sproteínas, manteniendo así la homeostasia en el interior de las ce&#769;lulas.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">La  inhibición del proteosoma S26 </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">evita la  proteolisis dirigida y afecta a mu&#769;ltiples cascadas de sen&#771;alizacio&#769;n  intracelulares, lo que origina en u&#769;ltima instancia la muerte de la ce&#769;lula  neopla&#769;sica. La inhibicio&#769;n del proteosoma mediada por el medicamento Bortezomib  afecta de varias maneras a las ce&#769;lulas neopla&#769;sicas, entre ellas mediante la  alteracio&#769;n de las protei&#769;nas reguladoras que controlan la progresio&#769;n del ciclo  celular y la activacio&#769;n nuclear del Factor nuclear kappa B (NF-&#954;B). La  inhibicio&#769;n del proteosoma provoca detencio&#769;n del ciclo celular y de la  apoptosis. El NF-&#954;B es un factor de transcripcio&#769;n cuya activacio&#769;n es necesaria  para muchos aspectos de tumoroge&#769;nesis, incluido el crecimiento y la  supervivencia celulares, la angioge&#769;nesis, las interacciones intercelulares y  las meta&#769;stasis. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">El  Bortezomid </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">inhibe </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121"> proteosoma S26 </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">y el  NF-&#954;B mediante el bloqueo </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">de  I&#954;B&#945;. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">El  NF-&#954;B inhibido por el Bortezomid sensibiliza al LDCBG subtipo ABC a la  quimioterapia y mejora los resultados del tratamiento (77,78). El Bortezomib  tiene actividad en el subtipo ABC, pero cuando se combinó con quimioterapia, se  demostró una respuesta significativamente mayor (83 % vs. 13</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: white">.</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">%,  P &lt; 0,001 ) y un aumento en la mediana de sobrevida global (10,8 vs 3,4 meses, P  = 0,003) en LDCBG subtipo ABC comparado con el subtipo GCB, respectivamente.  Estos resultados sugieren que el </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919"> Bortezomib </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">mejora  la actividad de la quimioterapia en el </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">linfoma  difuso de células similares a la célula B activada (</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">variante </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">ABC) </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">pero  no en el subtipo de </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">células B  semejantes a las del centro germinal </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (variante </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">GCB</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">)  y proporcionan un enfoque terapéutico racional basado en subtipos LDCBG  genéticamente distintos (79).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Agentes  novedosos en evaluación en pacientes con LDCBG</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">A.  Agentes que benefician a los pacientes con el subgrupo molecular </span> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">linfoma  difuso de células similares a la célula B activada (</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">variante </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">ABC):</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">1. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Fosfatamatinib </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">es un  inhibidor oral de Syk, una tirosina quinasa no receptora. Syk tiene una amplia  gama de funciones biológicas, que incluyen un papel crítico en la cascada de  señalización intracelular para el receptor de Ig(s) en linfocitos B, y el  receptor Fc expresado en numerosas células efectoras inmunitarias (80).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">2. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919"> Ibrutinib </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">es un  inhibidor de la BTK (Bruton </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626"> tirosina quinasa)</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">,  que </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #222222">es una  molécula importante de señalización del receptor antigénico de linfocitos B  (BCR) y las vías de receptores de citoquinas</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">,  siendo de administración oral </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> (81,82).</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">3. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">Zydelig </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">o </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #222222"> Idelalisib </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #222222">es un  inhibidor selectivo de la fosfoinositol 3-quinasa (</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">PI3K&#948;</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #222222">),  esencial para la activación, proliferación y supervivencia de los linfocitos B.  La </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">PI3K&#948;  está hiperactivada en tumores malignos de células B y desempeña un papel  fundamental en la vía de señalización del BCR, un impulsor oncogénico clave en  las neoplasias de células B </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #222222">(83).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">4. </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919"> Enzastaurin, que </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">inhibe  la PKC&#946;, </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">había  mostrado resultados preclínicos alentadores para la prevención de la  angiogénesis, la inhibición de la proliferación y la inducción de apoptosis, así  como una citotoxicidad limitada dentro de los ensayos clínicos de fase I. Sin  embargo, durante su evaluación en ensayos clínicos de fase II y III, la eficacia  de enzastaurina fue pobre como agente único o en combinación con otros fármacos  (84).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">B.  Agentes para tratamiento de pacientes con linfoma de </span> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">células B  semejantes a las del centro germinal </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (variante </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">GCB</span></b><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">):</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Navitoclax, </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">un  inhibidor de BCL-2.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919"> Inhibidores de la histona lisina metil transferasa (EZH2). </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">La  EZH2 se ha detectado sobreexpresada en varios cánceres y mutadas en linfomas  difusos y se correlaciona con un pronóstico pobre (85).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919"> Bevacizumab </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">es un  anticuerpo monoclonal humanizado que inhibe el factor de crecimiento endotelial  vascular (</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">VEGF),  pero es cardiotóxico combinado con CHOP (85,86).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919"> Lenalidomida </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">es un  inmunomodulador con propiedades antiangiogénicas y acción directa antitumoral  inhibiendo el NF-kB, y se han reportado buenos resultados en pacientes que  habían recibido varios esquemas de quimioterapia previamente. En el LDCBG  variante no germinal se han reportado respuestas hasta del 28 %.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">La  Lenalidomida administrada a pacientes con LDCBG en recaída y refractarios mostró  mejor respuesta en </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">el  linfoma difuso de células similares a la célula B activada (ABC) que en los  pacientes con </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> linfoma difuso </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">de  células B semejantes a las de centro germinal (GCB)</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">,  con respuestas globales de 52,9 % vs. 8,7</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: white">.</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #262626">%  (P=0,006), respuestas completas 23,5 % vs. 4,3 % y una media de sobrevida libre  de progresión de 6,2 vs. 1,7 meses (P=0,004), pero sin diferencias en la  sobrevida global. R-CHOP más Lenalidomida administrada a pacientes con LDCGB  tiene mejor respuesta en el subtipo ABC una eficacia que podría superar el  pronóstico negativo de los LDCBG no centro germinales. Se están realizando  varios protocolos comparando el esquema convencional R-CHOP con R/CHOP +  Lenalidomida y protocolos usando Lenalidomida como agente de primera línea,  identificados como NCT01122472 (REMARC), NCT02285062 (ROBUST), NCT02128061 </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> (86-88).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Tratamiento de primera línea para los pacientes con reducida función ventricular  izquierda o muy frágiles</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">La  cardiotoxicidad es un efecto adverso de la quimioterapia. Este efecto puede  manifestarse de diversas maneras que van desde una elevación transitoria de la  tensión arterial, bradicardia, hipotensión o arritmias, hasta una insuficiencia  cardíaca no reversible. Existen diferentes factores de riesgo asociados a las  complicaciones cardiovasculares; entre ellos: la dosis acumulada, el total de la  dosis administrada en un ciclo o en un día, la velocidad de administración, la  edad, el sexo, antecedentes de radiación de mediastino, combinación con otros  fármacos cardiotóxicos y desórdenes de electrolitos. El efecto potencial de  estas complicaciones debe ser previsto antes de iniciar el tratamiento con  quimioterapia.</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Existe  toxicidad cardiovascular si se cumple uno o más de los siguientes criterios:</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">1.  Cardiomiopatía con disminución de la fracción de eyección.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">2.  Presencia de síntomas de insuficiencia cardíaca.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">3.  Presencia de signos de insuficiencia cardíaca.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">4.  Disminución de menos del 5 % de la fracción de eyección basal o fracción de  eyección del ventrículo izquierdo (FEVI) menor al 55 % con síntomas.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">5.  Disminución de más del 10 % de la fracción de eyección basal o FEVI menor al 55  % sin síntomas (89).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Las  antraciclinas son un grupo de antibióticos citotóxicos que causan cardiopatías.  Los principales factores de riesgo para desarrollar insuficiencia cardíaca por  estos agentes citotóxicos son la dosis acumulada (por ejemplo dosis mayores de  550 mg/m</span><font size="2"><span style="font-family: Times-Roman; color: black"><sup>2</sup></span></font><span style="font-family: Times-Roman; color: black"><font size="2"> </font></span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">de  doxorrubicina), edad mayor a 70 años, irradiación temprana o simultánea con la  quimioterapia, uso de otros fármacos que lesionan al miocito (90-92).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">En  todos los casos anteriores </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">debe  disminuirse la dosis de antraciclinas y agente alquilantes de acuerdo a la  fraccion de eyección. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">Se han  propuesto una serie de enfoques para tratar a estos pacientes. Estos incluyen la  eliminación de doxorrubicina del R- CHOP, la sustitución de doxorrubicina por  mitoxantrona, la sustitución de doxorrubicina por doxorubcina encapsulada en  liposomas, sustitución de doxorubicina por etoposido, el uso de bendamustina-Rituximab,  y la sustitución de doxorrubicina por procarbazina</span><span style="font-family: Times-Roman; color: white"><font size="2">&amp;</font></span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">(17).  Y también se han propuesto </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> cambiar de esquemas de quimioterapia para otro que no contengan antraciclinas  como los siguientes esquemas:</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> R-CEPP </span></b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (Rituximab, Ciclofosfamida, Etopósido, Prednisona) (65).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> R-CCOP </span></b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (Rituximab, Ciclofosfamida, Doxorubicina liposomal, Vincristina, Prednisona</span><span lang="PT-BR" style="font-family: Times-Roman; color: white"><font size="2">&amp;</font></span><span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black">(93).</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> DA- EPOCH o dosis ajustada de R-EPOCH </span></b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (Etopós ido, Prednisona, Vincristina, Ciclofosfamida, Doxorrubicina) + Rituximab</span><span lang="PT-BR" style="font-family: Times-Roman; color: white"><font size="2">&amp;</font></span><span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black">(68).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> CDOP </span></b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (Ciclofosfamida, Doxorubicina liposomal, Vincristina, Prednisona) + Rituximab</span><sup><span lang="PT-BR" style="font-family: Times-Roman; color: black"><font size="2">&amp;</font></span></sup><span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black">(94)</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> R-CNOP </span></b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (Rituximab, Ciclofosfamida, Mitoxantrone, Vincristina, Prednisona) (95,96).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> R-CEOP </span></b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (Rituximab, Ciclofosfamida, </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> Etoposido, Vincristina, Prednisolona) (97).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">La  inclusión de cualquier antraciclina o antracenodiona en pacientes con  insuficiencia cardíaca debe tener la monitorización cardiaca más frecuente (90).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Quimioterapia para pacientes con LDCBG &gt; 80 años de edad con comorbilidades</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">R-mini –  CHOP (<a href="#cua7">Cuadro 7</a>) (98).</span></font></p>     <p style="text-align: center; text-autospace: none"><a name="cua7"> <img border="0" src="/img/fbpe/gmc/v125n4/art03cua7.gif" width="571" height="128"></a></p>     
<p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Tratamiento de pacientes con LDCBG con presentación simultánea de enfermedad del  sistema nervioso central (SNC)</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">Una de  las complicaciones más graves para un paciente con LDCBG es el desarrollo de  metástasis del SNC, con afectación del líquido cefalorraquídeo y las meninges,  pero también pueden producirse metástasis cerebrales parenquimatosas sólidas.  Los factores asociados con la recaída del SNC incluyen sitios específicos de  afectación (es decir, nasofaríngeo, epidural, testicular y otros sitios  extranodales como mama, glándula suprarrenal, hueso y médula ósea), lactato  deshidrogenasa sérica alta, albúmina sérica baja, edad menor de 60 años y  enfermedad más extensa. Los pacientes que corren un alto riesgo de desarrollar  una afección del sistema nervioso central suelen recibir tratamiento  profiláctico para intentar reducir su frecuencia. El tratamiento más común  utilizado para prevenir la metástasis meníngea ha sido el metotrexato intratecal,  con o sin citarabina o metotrexato intravenoso de alta dosis. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">A. Si  hay Infiltración del parénquima del SNC: se administra Metotrexate sistémico a  razón de 3 g/</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">m</span><font size="2"><span style="font-family: Times-Roman; color: black"><sup>2</sup></span></font><span style="font-family: Times-Roman; color: #191919"><font size="2"> </font></span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">IV el  día 15 de un ciclo de 21 días con rescate con leucovorina y R-CHOP cada 21 días  con factores estimulantes de colonias de granulocitos. B. Si hay infiltración  leptomeníngea: se administran 4-8 dosis de 15 mg de Metotrexato intratecal 2  veces semanal con o sin Citarabina (40 mg), considerando la colocación del  catéter reservorio de Ommaya y/o Metotrexato sistémico (3 g/</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">m</span><font size="2"><span style="font-family: Times-Roman; color: black"><sup>2</sup></span></font><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">). </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">Cuando  se administran dosis altas de metotrexato, los pacientes deben ser previamente  hidratados y alcalinizados, y luego recibir rescate de leucovorina 24 horas  después del inicio de la infusión. La función renal y hepática debe ser  monitoreada. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> Ciertos pacientes con </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">LDCBG y  presencia de 4-6 factores pronósticos, linfoma con VIH positivo, linfoma  testicular o linfoma doble mutante </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">pueden  tener un mayor riesgo de infiltración del SNC. Aunque esta no sea segura debe  considerarse la profilaxis con 4-8 dosis de </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919"> Metotrexato intratecal </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">(15 mg)  y/o </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919"> Citarabina </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">(40 mg),  o </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919"> Metotrexato sistémico ( </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">3-3,5  g/m</span><sup><span style="font-family: Times-Roman; color: #191919"><font size="2">2</font></span></sup><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">)  durante el curso del tratamiento. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">Para  los pacientes con presentación concurrente de compromiso parenquimatoso del SNC,  se debe incorporar metotrexato sistémico (3-8 g/m</span><sup><span style="font-family: Times-Roman; color: #212121"><font size="2">2</font></span></sup><span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">)  como parte del plan de tratamiento (17,34).</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> Linfoma primario mediastínico de células B </span> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">grandes (LPMB)</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">Este  subtipo tiende a ocurrir en adultos jóvenes con una mediana de edad de 35 años  con un ligero predominio femenino. El LPMB es un subtipo de linfoma de células  grandes B de origen tímico con diseminación regional local inicial a los  ganglios supraclaviculares, cervicales e hiliares, al mediastino y al pulmón.  Los síntomas clínicos relacionados con el crecimiento rápido de la masa  mediastinal incluyen el síndrome de vena cava superior (SVC) y derrames  pericárdicos y pleurales (17).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Puede  ser tratado con 4-8 dosis de los siguientes regímenes de quimioterapia: </span> <b><span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-EPOCH </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Rituximab,  Etopósido 50 mg/m</span><span style="font-family: Times-Roman; color: black"><font size="2"><sup>2</sup> </font></span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">los días  1 a 4, Prednisona 60 mg/m</span><font size="2"><span style="font-family: Times-Roman; color: black"><sup>2</sup></span></font><span style="font-family: Times-Roman; color: black"><font size="2"> </font></span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">los días  1 a 5, Vincristina 0,4 mg/m</span><font size="2"><span style="font-family: Times-Roman; color: black"><sup>2</sup></span></font><span style="font-family: Times-Roman; color: black"><font size="2"> </font></span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">los días  1 a 4, Doxorubicina 10 mg/m</span><font size="2"><span style="font-family: Times-Roman; color: black"><sup>2</sup></span></font><span style="font-family: Times-Roman; color: black"><font size="2"> </font></span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">los días  1 a 4, Ciclofosfamida 750 mg/m</span><font size="2"><span style="font-family: Times-Roman; color: black"><sup>2</sup></span></font><span style="font-family: Times-Roman; color: black"><font size="2"> </font></span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">el día 5  del ciclo). Administrados cada 3 semanas por 6 ciclos y para enfermedad focal  persistente puede administrarse radioterapia.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> R-CHOP </span></b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (Rituximab, Ciclofosfamida, Doxorubicina, Vincristina, Prednisona) x 6 ciclos +  Radioterapia.</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> R-CHOP </span></b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> x 4 ciclos seguidos de </span><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> ICE </span></b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (Ifosfamida, Carboplatino, Etopósido) x 3 ciclos ± Radioterapia (99).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black"> Considerar que el papel de la radioterapia es controversial. El CT-PET  postratamiento es indispensable realizarlo; si el CT-PET es negativo al final  del tratamiento y la enfermedad inicial no era voluminosa los pacientes deben  ser observados. Las masas mediastinales residuales son comunes. Para pacientes  tratados con R-CHOP de inicio, la consolidación con radioterapia debe ser  considerada particularmente si persiste el aumento de la actividad FDG en el  tumor primario. Para pacientes que son CT-PET negativos después de terapias mas  intensas como DA-R-EPOCH la observación puede ser apropiada Se recomienda la  biopsia de las masas CT-PET positivas si se contempla administrar tratamiento de  quimioterapia sistémico adicional</span><span style="font-family: Times-Roman; color: white"><font size="2">&amp;</font></span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(17,24).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Linfoma  de la zona gris (LZG)</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">Es un  linfoma intermedio entre el LDCBG y el linfoma de Hodgkin y presenta </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121"> características tanto morfológicas como inmunofenotípicas que se encuentran  típicamente en el linfoma de Hodgkin clásico tipo esclerosis nodular y en el  linfoma primario mediastínico B. Los pacientes con LZG pueden presentar  enfermedad mediastínica o no mediastínica. Clínicamente, los pacientes con </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #212121">LZG </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121"> mediastínicos se presentan con gran masa mediastínica anterior con o sin  afectación de los ganglios linfáticos supraclaviculares; se observan con mayor  frecuencia en varones jóvenes de 20-40 años de edad. Los pacientes con </span> <b><span style="font-size: 10.0pt; font-family: Times-Bold; color: #212121">LZG </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">no  mediastínica tienden a ser mayores y tienen una mayor incidencia de enfermedad  en estadio avanzado y puntaje de IPI de alto riesgo comparados con sus  contrapartes mediastinales . El inmunofenotipo es atípico, a menudo muestra  características de transición entre LPMB y LHC. En general, CD45 es a menudo  positivo, así como CD15, CD20, CD30 y CD79a. CD10 y ALK son generalmente  negativos. Si la morfología se asemeja más a LPMB, la ausencia de CD20, la  positividad de CD15 o la presencia de EBV podrían sugerir el linfoma de la zona  gris. Si la morfología se asemeja más a LHC, la expresión fuerte de CD20 y la  ausencia de CD15 podrían sugerir LZG (24,100).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121"> Pacientes tratados con ABVD </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">± </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">R  tuvieron una sobrevida libre de progresión (SLP) notoriamente inferior a 2 años  (22 % versus 52 %, P = 0,03) en comparación con CHOP </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">± </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">R y  DA-EPOCH-R. Además, el Rituximab se asoció con una mejoría de la SLP en análisis  multivariables (cociente de riesgos instantáneos: 0,35; intervalo de confianza  del 95 %, 0,18-0,69; P=0,002). Colectivamente, es una entidad heterogénea y  probablemente más común y, a menudo con presentación no mediastínica, mientras  que los resultados parecen superiores cuando se los trata con un régimen  específico de LDCBG basado en Rituximab</span><span style="font-family: Times-Roman; color: white"><font size="2">&amp;</font></span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">(34,101,102).  Curiosamente, un informe de investigadores del Instituto Nacional del Cáncer (EE.UU)  sugirió que pacientes con LZG mediastínico tuvieron un resultado mucho peor  cuando se trataron con R-EPOCH que pacientes similares con linfoma de células B  mediastínico típico (24).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">Se  recomienda como tratamiento regímenes de linfoma de células B tipo C</span><b><span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">HOP </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">y si  las células tumorales son CD20+ la adición de Rituximab al CHOP o </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">R-CHOP </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">pero  no hay consenso de cual es el mejor tratamiento para el LZG. Los datos de  pacientes tratados con quimioterapia sugieren que el uso de quimioterapia que  contenga Rituximab y Antraciclina como en otros linfomas de células B es útil.  Si la enfermedad está localizada, a continuación, se prefiere radioterapia. No  hay una diferencia ostensible en los resultados del tratamiento de pacientes con  una u otra forma (mediastínica o no mediastínica) de LZG</span><span style="font-family: Times-Roman; color: white"><font size="2">&amp;</font></span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(17,24,101,102).</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Armitage  sugiere como tratamiento para </span><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">LZG </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">el  esquema de quimioterapia de R-</span><span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">CHOP  seguido de radioterapia indicando que este tratamiento puede ser curativo.  Necesita ser resuelto si estos pacientes requerirán regímenes similares al  linfoma de Hodgkin con autotrasplante como parte de su terapia primaria o  enfoques de tratamiento completamente diferentes (17).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">Para  los pacientes con LZG recidivante o refractario se debe considerar la  quimioterapia de rescate seguida de trasplante de </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> células madres autólogas </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">como  consolidación. Finalmente, se justifica el examen biológico y patológico  continuo de esta entidad patológica única así como la exploración hacia la  integración de agentes terapéuticos específicos (p. ej., Brentuximab vedotin,  inhibidores de la apoptosis 1, inhibidores del BCR, inhibidores de proteasomas,  etc.) en el paradigma de tratamiento del LZG (103).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">Linfoma  doble mutado</span></b></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Se  definen por presentar un punto de corte cromosómico que afecta el locus MYC/8q24  en combinación con otro punto de corte recurrente, principalmente un t (14; 18)  (q32; q21) que implica BCL-2. Todos los estudios en series más grandes de  pacientes sugieren un mal pronóstico, también si se tratan con R-CHOP o  modalidades de tratamiento de alta intensidad. Es importante destacar que este  mal resultado no puede explicarse por la mera presencia de un punto de corte MYC  / 8q24. Probablemente, la combinación de expresión de MYC y BCL-2 y/o una alta  complejidad genómica relacionada son más importantes. En comparación con estos  linfomas DH, los linfomas BCL-6 (+) / MYC (+) DH son mucho menos comunes, y de  hecho la mayoría de estos casos representan linfomas de triple golpe BCL-2 (+) /  BCL-6 (+) / MYC (+) con afectación de BCL-2 también (25).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">Se  recomienda como tratamiento los siguientes esquemas de quimioterapia:</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> DA-R-EPOCH </span></b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (46).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: black">R-Hyper-CVAD </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(Ciclofosfamida,  Vincristina, Doxorrubicina y Dexametasona alterna con altas dosis de Metotrexato  y Citarabina) + Rituximab</span><span style="font-family: Times-Roman; color: white"><font size="2">&amp;</font></span><span style="font-size: 10.0pt; font-family: Times-Roman; color: black">(104). </span> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (<a href="#cua8">Cuadro 8</a>).</span></font></p>     <p style="text-align: center; text-autospace: none"><a name="cua8"> <img border="0" src="/img/fbpe/gmc/v125n4/art03cua8.gif" width="572" height="277"></a></p>     
<p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Bold; color: black"> R-CODOX-M / R-IVAC </span></b> <span lang="PT-BR" style="font-size: 10.0pt; font-family: Times-Roman; color: black"> (Rituximab - Ciclofosfamida, Vincristina, Doxorrubicina con Metotrexato/Ifosfamida,  Etopósido y Citarabina) (105).</span></font></p>     <p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">R-CHOP </span></b> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">se ha  asociado con resultados inferiores. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">El uso  de radioterapia de consolidación para la enfermedad localizada y/o voluminosa y </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">la  posibilidad de consolidación con la terapia de altas dosis de quimioterapia con  rescate de células madre autólogas, </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: black">no es  una indicación clínicamente aprobada por la evidencia actual pero lo realizan  miembros de la NCCN en reconocidas instituciones, aunque no se ha establecido su  papel definitivo (24).</span></font></p>     ]]></body>
<body><![CDATA[<p style="text-align: justify; text-autospace: none"><font face="Verdana"><b> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #191919">Linfoma  testicular </span> <span style="font-size: 10.0pt; font-family: Times-Bold; color: #212121"> primario (LTP)</span></b></font></p>     <p align="justify"><font face="Verdana"> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">Es una  forma rara y clínicamente agresiva de linfoma extraganglionar. La gran mayoría  de los casos son LDCBG con una edad promedio al momento del diagnóstico de 66 a  68 años. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919"> Después de finalizar la quimioterapia se recomienda dar radioterapia escrotal  (25-30 Gy). En pacientes que no son candidatos para quimioterapia, administrar  radioterapia </span><i> <span style="font-size: 10.0pt; font-family: Times-Italic; color: #191919">in  situ</span></i><span style="font-size: 10.0pt; font-family: Times-Roman; color: #191919">. </span> <span style="font-size: 10.0pt; font-family: Times-Roman; color: #212121">LTP es  la neoplasia testicular más común en hombres de más de 60 años y la neoplasia  testicular bilateral más común. La presentación típica consiste en una masa  testicular firme e indolora sin preferencia por ningún lado, inseparable del  testículo afectado, con un tamaño mediano del tumor de 6 cm. Con R-CHOP-21 con  metotrexato intratecal y radioterapia locorregional que es el estándar  internacional actual de tratamiento, una minoría sustancial de pacientes  progresa (106).</span></font></p>      <p align="justify"><font face="Verdana" size="2"><b>REFERENCIAS</b></font></p>     <!-- ref --><p align="justify"><font face="Verdana" size="2">1. 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