<?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>0212-1611</journal-id>
<journal-title><![CDATA[Nutrición Hospitalaria]]></journal-title>
<abbrev-journal-title><![CDATA[Nutr. Hosp.]]></abbrev-journal-title>
<issn>0212-1611</issn>
<publisher>
<publisher-name><![CDATA[Grupo Arán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0212-16112016000700003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El músculo, elemento clave para la supervivencia en el enfermo neoplásico]]></article-title>
<article-title xml:lang="en"><![CDATA[Muscle wasting as a key predictor of survival in cancer patients]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miján de la Torre]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Universitario de Burgos Servicio de Medicina Interna Unidad de Nutrición Clínica]]></institution>
<addr-line><![CDATA[Burgos ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<volume>33</volume>
<fpage>11</fpage>
<lpage>16</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-16112016000700003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-16112016000700003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-16112016000700003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El síndrome de caquexia cancerosa es responsable de la muerte de un número significativo de pacientes con cáncer. Se caracteriza por la presencia de una ingesta reducida, con inflamación sistémica y un metabolismo alterado. Los enfermos presentan característicamente una progresiva pérdida de peso y de masa muscular, junto a deterioro funcional. La pérdida muscular se debe a la combinación de reducción de la síntesis proteica con aumento de su degradación. Ello conduce tanto a un acortamiento como a una reducción en el área de la fibra muscular. Asimismo, existen datos que apoyan que selectivamente algunos de los tipos de fibra muscular se ven más afectados. Es necesario definir bien los valores de corte de sarcopenia para diagnosticar la pérdida muscular y existen diferentes métodos. El sistema de la ubiquitina-proteasoma parece desempeñar un papel predominante en la degradación de la proteína miofibrilar. La tendencia a perder masa muscular en los pacientes con caquexia cancerosa parece estar asociada a la activación de señales catabólicas por citoquinas proinflamatorias, así como por productos tumorales del tipo factor inductor de proteólisis. En referencia a los factores pronósticos, el riesgo de muerte está bien documentado en pacientes con sarcopenia y, especialmente, en aquellos con obesidad asociada a la sarcopenia. Asimismo, se ha establecido una relación directa entre la pérdida intensa de masa muscular y la supervivencia en pacientes con diferentes tipos de tumores del tipo de cáncer de páncreas, pulmón, tracto biliar o cáncer colorrectal. Respecto de la terapia en el síndrome de caquexia cancerosa, es factible que requiera tratamiento con varios grupos combinados que incluyan, junto al soporte nutricional, fármacos orexígenos, con efecto anabólico y antinflamatorio, asociados a intervenciones que estimulen el ejercicio físico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Cachexia syndrome has been estimated to be responsible for the death of a significant amount of cancer patients. It is characterized mainly by reduced intake, systemic inflammation and anomalous metabolism. Progressive loss of body weight, muscle wasting and functional impairment are remarkable features of the entity. Muscle wasting is due to a combination of both a diminution of protein synthesis and an increase in protein degradation. Progressive reduction of muscle protein drives to muscle fibre lessening and a reduction in its cross sectional area. Likewise, there is some evidence that a specific type of fiber is targeted in this setting. Defined cut points for sarcopenia are essential to diagnose skeletal muscle depletion and various methods have been carried out. The ubiquitin-proteasome pathway seems to play the main role in the breakdown of myofibrillar proteins. The trend to lose muscle in cancer cachexia patients may be associated to the triggering of catabolic signals by pro-inflammatory cytokines or tumour-specific agents such as proteolysis-inducing factor. Regarding prognostication, mortality risk is documented in sarcopenic cancer patients but is particularly accentuated in sarcopenic obese ones. A relationship between severe muscle depletion and survival has been shown in patients with different types of cancer such us pancreas, lung, biliary tract and colorrectal cancer. Therapeutic interventions for cancer cachexia syndrome are likely to require treatments from various groups including a combination of nutritional support, drugs with orexigenic, anabolic, anti-inflammatory effects and also non-pharmacologic interventions such as exercise.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cáncer]]></kwd>
<kwd lng="es"><![CDATA[Supervivencia]]></kwd>
<kwd lng="es"><![CDATA[Caquexia]]></kwd>
<kwd lng="es"><![CDATA[Sarcopenia]]></kwd>
<kwd lng="es"><![CDATA[Pérdida muscular]]></kwd>
<kwd lng="en"><![CDATA[Cancer]]></kwd>
<kwd lng="en"><![CDATA[Survival]]></kwd>
<kwd lng="en"><![CDATA[Cachexia]]></kwd>
<kwd lng="en"><![CDATA[Sarcopenia]]></kwd>
<kwd lng="en"><![CDATA[Muscle wasting]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <a name="top"></a>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="4"><b>El m&uacute;sculo, elemento clave para la supervivencia en el enfermo neopl&aacute;sico</b></font></p>     <p><font face="Verdana" size="4"><b>Muscle wasting as a key predictor of survival in cancer patients</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Alberto Mij&aacute;n de la Torre</b></font></p>     <p><font face="Verdana" size="2">MD, PhD, CNSC. Unidad de Nutrici&oacute;n Cl&iacute;nica, Servicio de Medicina Interna, Hospital Universitario de Burgos, Burgos</font></p>     <p><font face="Verdana" size="2"><a href="#bajo">Direcci&oacute;n para correspondencia</a></font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1">     <p><font face="Verdana" size="2"><b>RESUMEN</b></font></p>     <p><font face="Verdana" size="2">El s&iacute;ndrome de caquexia cancerosa es responsable de la muerte de un n&uacute;mero significativo de pacientes con c&aacute;ncer. Se caracteriza por la presencia de una ingesta reducida, con inflamaci&oacute;n sist&eacute;mica y un metabolismo alterado. Los enfermos presentan caracter&iacute;sticamente una progresiva p&eacute;rdida de peso y de masa muscular, junto a deterioro funcional. La p&eacute;rdida muscular se debe a la combinaci&oacute;n de reducci&oacute;n de la s&iacute;ntesis proteica con aumento de su degradaci&oacute;n. Ello conduce tanto a un acortamiento como a una reducci&oacute;n en el &aacute;rea de la fibra muscular. Asimismo, existen datos que apoyan que selectivamente algunos de los tipos de fibra muscular se ven m&aacute;s afectados. Es necesario definir bien los valores de corte de sarcopenia para diagnosticar la p&eacute;rdida muscular y existen diferentes m&eacute;todos. El sistema de la ubiquitina-proteasoma parece desempe&ntilde;ar un papel predominante en la degradaci&oacute;n de la prote&iacute;na miofibrilar. La tendencia a perder masa muscular en los pacientes con caquexia cancerosa parece estar asociada a la activaci&oacute;n de se&ntilde;ales catab&oacute;licas por citoquinas proinflamatorias, as&iacute; como por productos tumorales del tipo factor inductor de prote&oacute;lisis.    <br>En referencia a los factores pron&oacute;sticos, el riesgo de muerte est&aacute; bien documentado en pacientes con sarcopenia y, especialmente, en aquellos con obesidad asociada a la sarcopenia. Asimismo, se ha establecido una relaci&oacute;n directa entre la p&eacute;rdida intensa de masa muscular y la supervivencia en pacientes con diferentes tipos de tumores del tipo de c&aacute;ncer de p&aacute;ncreas, pulm&oacute;n, tracto biliar o c&aacute;ncer colorrectal.    <br>Respecto de la terapia en el s&iacute;ndrome de caquexia cancerosa, es factible que requiera tratamiento con varios grupos combinados que incluyan, junto al soporte nutricional, f&aacute;rmacos orex&iacute;genos, con efecto anab&oacute;lico y antinflamatorio, asociados a intervenciones que estimulen el ejercicio f&iacute;sico.</font></p>     <p><font face="Verdana" size="2"><b>Palabras clave:</b> C&aacute;ncer. Supervivencia. Caquexia. Sarcopenia. P&eacute;rdida muscular.</font></p> <hr size="1">     <p><font face="Verdana" size="2"><b>ABSTRACT</b></font></p>     <p><font face="Verdana" size="2">Cachexia syndrome has been estimated to be responsible for the death of a significant amount of cancer patients. It is characterized mainly by reduced intake, systemic inflammation and anomalous metabolism. Progressive loss of body weight, muscle wasting and functional impairment are remarkable features of the entity. Muscle wasting is due to a combination of both a diminution of protein synthesis and an increase in protein degradation. Progressive reduction of muscle protein drives to muscle fibre lessening and a reduction in its cross sectional area. Likewise, there is some evidence that a specific type of fiber is targeted in this setting. Defined cut points for sarcopenia are essential to diagnose skeletal muscle depletion and various methods have been carried out. The ubiquitin-proteasome pathway seems to play the main role in the breakdown of myofibrillar proteins. The trend to lose muscle in cancer cachexia patients may be associated to the triggering of catabolic signals by pro-inflammatory cytokines or tumour-specific agents such as proteolysis-inducing factor.    <br>Regarding prognostication, mortality risk is documented in sarcopenic cancer patients but is particularly accentuated in sarcopenic obese ones. A relationship between severe muscle depletion and survival has been shown in patients with different types of cancer such us pancreas, lung, biliary tract and colorrectal cancer.    ]]></body>
<body><![CDATA[<br>Therapeutic interventions for cancer cachexia syndrome are likely to require treatments from various groups including a combination of nutritional support, drugs with orexigenic, anabolic, anti-inflammatory effects and also non-pharmacologic interventions such as exercise.</font></p>     <p><font face="Verdana" size="2"><b>Key words:</b> Cancer. Survival. Cachexia. Sarcopenia. Muscle wasting.</font></p> <hr size="1">     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Introducci&oacute;n</b></font></p>     <p><font face="Verdana" size="2">Se puede estimar que aproximadamente el 25% de las muertes en el mundo desarrollado son debidas al c&aacute;ncer. Los pacientes con c&aacute;ncer padecen con frecuencia un deterioro de su estado nutricional, junto a una importante alteraci&oacute;n en su composici&oacute;n corporal y tambi&eacute;n de su estado funcional. A lo largo de los a&ntilde;os se han formulado diversas definiciones para precisar y clasificar el deterioro nutricional de estos enfermos atendiendo a diferentes m&eacute;todos, fundamentados la mayor&iacute;a en la p&eacute;rdida involuntaria de peso; finalmente se ha aceptado el t&eacute;rmino de caquexia cancerosa", cuadro con frecuencia acompa&ntilde;ado de ingesta reducida e inflamaci&oacute;n sist&eacute;mica. El concepto de caquexia (en griego mala-situaci&oacute;n) ha sufrido diversos avatares en el tiempo; en el a&ntilde;o 2008 se propuso una definici&oacute;n (1) que identifica la p&eacute;rdida de peso como signo prominente y est&aacute; "caracterizada por p&eacute;rdida de masa muscular, con o sin p&eacute;rdida de masa grasa, que se diferencia de la p&eacute;rdida de masa muscular que acontece en el ayuno, envejecimiento, depresi&oacute;n primaria, malabsorci&oacute;n o hipertiroidismo, estando con frecuencia asociada la presencia de anorexia, inflamaci&oacute;n y resistencia a la insulina; y se relaciona con un aumento de la morbilidad".</font></p>     <p><font face="Verdana" size="2">En el a&ntilde;o 2011 un consenso internacional (2) estableci&oacute; los criterios para el diagn&oacute;stico del s&iacute;ndrome de caquexia cancerosa basados en: 1) una p&eacute;rdida de peso superior al 5% en los &uacute;ltimos seis meses, o 2) cualquier grado de p&eacute;rdida de peso &gt; 2% con: a) un IMC &lt; 20 kg/m<sup>2</sup>, o b) un diagn&oacute;stico de sarcopenia basado en diferentes m&eacute;todos (antropometr&iacute;a, DXA, BIA, TC lumbar) con valores espec&iacute;ficos de corte. Este s&iacute;ndrome es frecuente y se aprecia en m&aacute;s del 50% de los pacientes con diversos tipos de c&aacute;ncer (3); se considera que es un factor de mal pron&oacute;stico respecto de la calidad de vida, menor supervivencia y reducci&oacute;n en la tolerancia o respuesta al tratamiento (2-4).</font></p>     <p><font face="Verdana" size="2">La p&eacute;rdida de peso en el sujeto con c&aacute;ncer es variable, dependiendo de la localizaci&oacute;n y el tipo de tumor, y su mayor prevalencia corresponde a quienes presentan tumores s&oacute;lidos de tipo g&aacute;strico, pancre&aacute;tico, pulm&oacute;n, colorrectal o de cabeza y cuello (5). En enfermos con c&aacute;ncer de p&aacute;ncreas, el 80% ha perdido al menos el 10% del peso corporal cuando se diagnostican y el s&iacute;ndrome de caquexia est&aacute; presente en el 20-25% de los casos (6). La p&eacute;rdida de peso es tan frecuente que puede afectar hasta al 86% de los pacientes con c&aacute;ncer en las &uacute;ltimas 1-2 semanas de vida (7).</font></p>     <p><font face="Verdana" size="2">La presencia de p&eacute;rdida de masa muscular, definida como sarcopenia, qued&oacute; establecida como la reducci&oacute;n de la masa muscular en m&aacute;s de 2 desviaciones est&aacute;ndar respecto de la de adultos sanos (8). Actualmente sabemos que la sarcopenia se asocia, en sujetos con enfermedades no malignas, con discapacidad y mayor mortalidad (9) y, cuando se asocia como obesidad -enfermedad conocida como obesidad sarcop&eacute;nica- nos encontramos con la peor situaci&oacute;n, pues combina los riesgos de la obesidad junto a los de la sarcopenia (10-12). En los pacientes con caquexia cancerosa, aunque suele existir una depleci&oacute;n tanto del compartimento graso como magro, es la p&eacute;rdida de masa muscular esquel&eacute;tica la que m&aacute;s incide sobre su calidad de vida y funci&oacute;n, y est&aacute; asociada a una peor evoluci&oacute;n y menor supervivencia (2,13-16).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Fisiopatolog&iacute;a de la caquexia cancerosa: papel del m&uacute;sculo-sarcopenia</b></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">En los pacientes con c&aacute;ncer, una serie de factores aumentan la respuesta catab&oacute;lica, que conduce a una movilizaci&oacute;n no sostenible de grasas y m&uacute;sculo que lleva, a su vez, a la p&eacute;rdida muscular, la cual produce una mortalidad y morbilidad significativas (17). Entre estos factores destacan la progresi&oacute;n tumoral, comorbilidades, edad avanzada, mala condici&oacute;n f&iacute;sica y d&eacute;ficits nutricionales, as&iacute; como el tratamiento m&eacute;dico aplicado (18), contribuyendo tambi&eacute;n el consumo de nutrientes por el propio tumor (17). Se produce una alteraci&oacute;n en el metabolismo de amino&aacute;cidos y prote&iacute;nas que conlleva un aumento de la prote&oacute;lisis, reducci&oacute;n de la s&iacute;ntesis proteica y del transporte de AA, junto con una mayor oxidaci&oacute;n de los AARR de origen muscular. Asimismo, la liberaci&oacute;n de mediadores inflamatorios contribuye a un aumento de la apoptosis muscular y tambi&eacute;n se produce una reducci&oacute;n en la capacidad regeneradora del m&uacute;sculo (19). La ruta que probablemente sea m&aacute;s afectada en el proceso de p&eacute;rdida muscular es la degradaci&oacute;n proteica mediada por la activaci&oacute;n de la v&iacute;a de proteasoma ubicuitina dependiente (20).</font></p>     <p><font face="Verdana" size="2">Existen muchas se&ntilde;ales intracelulares implicadas en el recambio proteico y, por tanto, en la p&eacute;rdida muscular (21). Entre otras, destacan las citocinas inflamatorias secretadas por el sistema inmune como el TNF-alfa o la IL1, o el propio tumor -factores catab&oacute;licos espec&iacute;ficos del tumor de tipo PIF (22) -, que activan enzimas que inducen el recambio proteico en el m&uacute;sculo esquel&eacute;tico. El TNF-alfa y la IL1 est&aacute;n involucrados en dos v&iacute;as metab&oacute;licas: la del factor nuclear kB y la de la MAPK p38, que median en la degradaci&oacute;n de la prote&iacute;na estructural muscular y tambi&eacute;n en la inhibici&oacute;n de la s&iacute;ntesis proteica (23). Junto a las citocinas, la degradaci&oacute;n proteica se acent&uacute;a y la s&iacute;ntesis proteica se reduce por la acci&oacute;n de un miembro de la familia de los TGF-beta: la miostatina (19). Asimismo, con frecuencia est&aacute;n frenadas se&ntilde;ales anab&oacute;licas como las producidas a trav&eacute;s del IGF-1 y la testosterona (24-27). Otra v&iacute;a catab&oacute;lica muscular que puede estar implicada es mediante la acci&oacute;n de la angiotensina II. En pacientes con insuficiencia cardiaca congestiva, el tratamiento con inhibidores de la enzima convertidora de la angiotensina produce aumento tanto en la grasa subcut&aacute;nea como en la masa muscular de pacientes caqu&eacute;cticos.</font></p>     <p><font face="Verdana" size="2">En relaci&oacute;n con el tratamiento m&eacute;dico aplicado, es conocido el papel de los corticoides en dosis elevadas, que producen p&eacute;rdida muscular y resistencia insul&iacute;nica (28). Asimismo, el tratamiento del c&aacute;ncer se dirige cada vez m&aacute;s hacia mecanismos moleculares responsables de la proliferaci&oacute;n celular de tipo v&iacute;a de la PI3K, AKT y del mTOR, asociadas con la iniciaci&oacute;n del c&aacute;ncer, pero tambi&eacute;n con la activaci&oacute;n del anabolismo proteico en el m&uacute;sculo (29-31). Por lo anterior, parece razonable anticipar que la p&eacute;rdida de masa muscular podr&iacute;a ser una toxicidad significativa de las drogas dirigidas a las v&iacute;as descritas (17).</font></p>     <p><font face="Verdana" size="2">Respecto de las modificaciones en la morfolog&iacute;a y estructura del m&uacute;sculo en el paciente oncol&oacute;gico con caquexia existen algunos datos. El m&uacute;sculo esquel&eacute;tico est&aacute; compuesto por fibras musculares que se clasifican seg&uacute;n su velocidad de contracci&oacute;n y el tipo de metabolismo energ&eacute;tico que mayormente utilizan. Las fibras pueden ser de contracci&oacute;n lenta o de tipo I o de contracci&oacute;n r&aacute;pida de tipo II. En general, las fibras de tipo I y IIa son aer&oacute;bicas y utilizan la fosforilaci&oacute;n oxidativa como principal energ&iacute;a, mientras que las fibras tipo IIx y IIb son anaer&oacute;bicas. El porcentaje y morfolog&iacute;a de fibra mayoritaria en un m&uacute;sculo determina su capacidad funcional. Factores ambientales y sobrevenidos pueden provocar cambios musculares en el tipo de fibra y en su morfolog&iacute;a, lo que puede alterar su funcionalidad e influir en los s&iacute;ntomas cl&iacute;nicos del paciente (32). Existe alguna evidencia sobre que la fibra -muscular se afecta selectivamente respecto de su tipo en la caquexia cancerosa (33-34). La p&eacute;rdida de prote&iacute;na muscular lleva a un encogimiento de la fibra muscular y a una reducci&oacute;n de su grosor, lo que conduce a los grupos musculares a cambios respecto de la composici&oacute;n de sus fibras y a una p&eacute;rdida marcada de la capacidad aer&oacute;bica (VO<sub>2</sub> m&aacute;ximo) tanto en sujetos sanos como en pacientes con c&aacute;ncer (35-36). Los m&uacute;sculos que contienen fibras r&aacute;pidas de tipo II como el tibial anterior y el gastrocnemio se pierden con m&aacute;s rapidez que los de fibras lentas de tipo I, como el s&oacute;leo, en la caquexia, debido a un aumento de la oxidaci&oacute;n y degradaci&oacute;n proteica en respuesta a est&iacute;mulos en las fibras de tipo II motivados por la caquexia (37).</font></p>     <p><font face="Verdana" size="2">Para concluir este apartado, debemos decir que, junto a la masa muscular esquel&eacute;tica, otros tejidos se ven afectados en la caquexia cancerosa, interactuando con el m&uacute;sculo; siguiendo a Argil&eacute;s y cols. (19), haremos un breve repaso.</font></p>     <p><font face="Verdana" size="2">A nivel del sistema nervioso central, en el cerebro se produce anorexia, s&iacute;ntoma marcado del s&iacute;ndrome de caquexia-anorexia. Es debida a una alteraci&oacute;n de determinados mediadores hipotal&aacute;micos, junto a una posible hipoosmia o disgeusia. Puede asociarse adem&aacute;s una disfunci&oacute;n cardiaca, con atrofia cardiaca, reducci&oacute;n en la inervaci&oacute;n del coraz&oacute;n, aumento del consumo energ&eacute;tico y una posible liberaci&oacute;n de mediadores inflamatorios. Puede haber un incremento de la termog&eacute;nesis con ineficiencia energ&eacute;tica, debido a un aumento y est&iacute;mulo del tejido adiposo marr&oacute;n (prote&iacute;nas desacoplantes, UCP). En el aparato digestivo, puede ocurrir una p&eacute;rdida de su funci&oacute;n como barrera intestinal, con alteraci&oacute;n en la producci&oacute;n de grelina y liberaci&oacute;n de mol&eacute;culas inflamatorias, as&iacute; como malabsorci&oacute;n intestinal. El h&iacute;gado puede contribuir en la respuesta de fase aguda, con reducci&oacute;n de la s&iacute;ntesis de prote&iacute;nas de tipo alb&uacute;mina, liberaci&oacute;n de prote&iacute;nas de fase aguda, as&iacute; como mediadores de inflamaci&oacute;n, participando en ciclos f&uacute;tiles metab&oacute;licos consumidores de energ&iacute;a. Para concluir, el tejido adiposo colabora con el proceso de emaciaci&oacute;n, mediante el aumento de la lip&oacute;lisis, liberaci&oacute;n de &aacute;cidos grasos y mediadores de la inflamaci&oacute;n.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Diagn&oacute;stico de la sarcopenia. p&eacute;rdida de masa muscular</b></font></p>     <p><font face="Verdana" size="2">Es importante definir unos valores de referencia de p&eacute;rdida de masa muscular que, desde un punto de vista cl&iacute;nico y epidemiol&oacute;gico, sean significativos respecto a la poblaci&oacute;n sana de referencia, ajustados por edad y sexo. Dichos valores pueden luego normalizarse seg&uacute;n par&aacute;metros de composici&oacute;n corporal, en general basados en la altura del individuo. Mediante ellos podremos comparar resultados obtenidos en diferentes poblaciones, mejorando la validez externa de nuestros estudios y datos cl&iacute;nicos.</font></p>     <p><font face="Verdana" size="2">Hemos comentado que la entidad cl&iacute;nica sarcopenia qued&oacute; establecida a trav&eacute;s de criterios DXA y con marcado acento epidemiol&oacute;gico-estad&iacute;stico como la reducci&oacute;n en la masa muscular en m&aacute;s de 2 desviaciones est&aacute;ndar respecto de la de adultos sanos (8). En pacientes con c&aacute;ncer existe poca bibliograf&iacute;a respecto a valores de referencia de depleci&oacute;n muscular en relaci&oacute;n con diferentes factores pron&oacute;sticos de evoluci&oacute;n (38,39), pero, en general, una regla aceptada es la presencia de un valor absoluto por debajo del p5 percentil (2). Diferentes m&eacute;todos aceptados con sus puntos de corte espec&iacute;ficos son:</font></p>     ]]></body>
<body><![CDATA[<blockquote>     <p><font face="Verdana" size="2">1. Por antropometr&iacute;a, el &aacute;rea muscular media del brazo &lt; 32 cm<sup>2</sup> y &lt; 18 cm<sup>2</sup>, para hombres y mujeres, respectivamente (40).</font></p>     <p><font face="Verdana" size="2">2. Por DXA, un &iacute;ndice muscular esquel&eacute;tico apendicular -4 extremidades- &lt; 7,26 kg/m<sup>2</sup> e &lt; 5,45 kg/m<sup>2</sup> para hombres y mujeres, respectivamente (8).</font></p>     <p><font face="Verdana" size="2">3. Por BIA, un &iacute;ndice de masa libre de grasa corporal, excluido hueso, &lt; 14,6 kg/m<sup>2</sup> e &lt; 11,4 kg/m<sup>2</sup> para hombres y mujeres, respectivamente (41).</font></p>     <p><font face="Verdana" size="2">4. Por t&eacute;cnica de imagen mediante TC, el &iacute;ndice muscular esquel&eacute;tico lumbar (v&eacute;ase m&aacute;s adelante), &lt; 52,4 cm<sup>2</sup>/m<sup>2</sup> e &lt; 38,5 cm<sup>2</sup>/m<sup>2</sup> para hombres y mujeres, respectivamente (42).</font></p> </blockquote>     <p><font face="Verdana" size="2">Respecto a la t&eacute;cnica de evaluaci&oacute;n de la masa muscular mediante TC, esta ha adquirido especial relevancia en los &uacute;ltimos tiempos (43,44), fundamentalmente porque se aprovecha la TC efectuada previamente al paciente y realizada por motivos clinico-diagn&oacute;sticos. Lo anterior confiere la certeza de que el diagn&oacute;stico de la sarcopenia precede al posible desenlace o evoluci&oacute;n, permitiendo estudios de cohortes prospectivos o retrospectivos. Se suele utilizar una imagen de TC de corte transversal a la altura de la tercera v&eacute;rtebra lumbar y, analizando los m&uacute;sculos de esa zona (psoas, erector <i>spinae, quadratus lumborum, transversus abdominis</i>, oblicuos externo e interno y rectos abdominales), medimos su &aacute;rea y caracter&iacute;sticas densitom&eacute;tricas -unidades Hounsfield y sus umbrales-, tras su integraci&oacute;n en diversos programas inform&aacute;ticos existentes en el mercado. Una vez calculada el &aacute;rea muscular a ese nivel (cm<sup>2</sup>), se normaliza por la altura en m<sup>2</sup>, obteniendo el &iacute;ndice musculoesquel&eacute;tico L3 (cm<sup>2</sup>/m<sup>2</sup>).</font></p>     <p><font face="Verdana" size="2">Asimismo, se han desarrollado y validado ecuaciones de regresi&oacute;n (44) que extrapolan los datos obtenidos en el corte L3 para predecir desde el punto de vista de la composici&oacute;n corporal tanto la masa libre total de grasa como la masa grasa total (en kg). Tambi&eacute;n se han fijado los valores de corte del &iacute;ndice musculoesquel&eacute;tico en L3 sexo-espec&iacute;ficos que se correlacionan con la composici&oacute;n corporal global para definir la sarcopenia y sus implicaciones cl&iacute;nicas (42). Como veremos, estos valores de corte se han asociado a evoluci&oacute;n desfavorable en pacientes con c&aacute;ncer (13,45).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Impacto de la sarcopenia. p&eacute;rdida de masa muscular en la evoluci&oacute;n de los pacientes con c&aacute;ncer</b></font></p>     <p><font face="Verdana" size="2">Desde hace mucho tiempo se conoce, fundamentalmente por estudios observacionales, una asociaci&oacute;n entre la desnutrici&oacute;n y una evoluci&oacute;n desfavorable en multitud de enfermedades. Se pueden citar como cl&aacute;sicos la publicaci&oacute;n en 1936 de Studley (46), as&iacute; como, entre muchas, las posteriores en 1980 de Buzby y cols. (47) y de Baker y cols. (48) en 1982. En pacientes con c&aacute;ncer se asiste a la misma situaci&oacute;n, relacion&aacute;ndose la p&eacute;rdida de peso con una evoluci&oacute;n negativa: a mayor p&eacute;rdida, menor supervivencia (49). Un bajo MNA tambi&eacute;n se asocia a peor pron&oacute;stico (50). El papel de la BIA como factor pron&oacute;stico es destacado, y se relaciona un &aacute;ngulo de fase reducido con una peor evoluci&oacute;n (51-58).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Asumiendo que la masa libre de grasa corporal representa el volumen de distribuci&oacute;n de la mayor&iacute;a de la medicaci&oacute;n citot&oacute;xica empleada en quimioterapia, podemos entender que la p&eacute;rdida de peso sea pron&oacute;stica de una mayor toxicidad del tratamiento (59). Prado y cols. (49) demostraron que en pacientes con c&aacute;ncer de mama que recib&iacute;an tratamiento con capecitabina, una masa muscular reducida era predictora de toxicidad dosis-limitante de la droga. El n&uacute;mero de publicaciones que relacionan la presencia de sarcopenia con interrupci&oacute;n de la quimioterapia o con la necesidad de reducci&oacute;n de su dosis se ha ido incrementando en m&aacute;s de un 20% (60-62).</font></p>     <p><font face="Verdana" size="2">Se ha identificado a la sarcopenia como un factor predictor de mayor mortalidad (63). Algunos autores, empleando los valores de corte del &iacute;ndice musculoesquel&eacute;tico lumbar L3, lo han demostrado (42,64). El riesgo de mortalidad, presente en sarcop&eacute;nicos con bajo peso y normopeso, se incrementa cuando a la sarcopenia se asocia sobrepeso u obesidad (64).</font></p>     <p><font face="Verdana" size="2">La sarcopenia tambi&eacute;n ha mostrado ser un factor pron&oacute;stico independiente de menor supervivencia en c&aacute;nceres espec&iacute;ficos como el de p&aacute;ncreas (13), tracto biliar (61,65), carcinoma adrenocortical (14), pulm&oacute;n (64), colorrectal (64), en pacientes ingresados para resecci&oacute;n de met&aacute;stasis hep&aacute;ticas de carcinoma colorrec-tal (66) y en aquellos que padecen carcinoma hepatocelular con sarcopenia diagnosticada por TC respecto a los que no tienen sarcopenia (67). Un trabajo reciente muestra asimismo que, en pacientes con carcinomatosis peritoneal por c&aacute;ncer colorrectal, a quienes se practica una cirug&iacute;a citorreductora con quimioterapia intraperitoneal hipert&eacute;rmica y que tienen depleci&oacute;n de m&uacute;sculo esquel&eacute;tico (TC en L3) presentan mayor riesgo de complicaciones postoperatorias graves (68). Respecto de datos obtenidos mediante imagen de TC, el valor absoluto y cuantificable de atenuaci&oacute;n de la radiaci&oacute;n en los m&uacute;sculos tambi&eacute;n se ha asociado con la supervivencia (64,69) y con el tiempo de hospitalizaci&oacute;n (70).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Tratamiento de la caquexia cancerosa: p&eacute;rdida muscular y sarcopenia</b></font></p>     <p><font face="Verdana" size="2">En la mayor&iacute;a de los pacientes con c&aacute;ncer, la caquexia es de causa multifactorial y como tal ha de ser tratada. De un lado, tenemos una reducci&oacute;n de la ingesta con menor aporte de energ&iacute;a, prote&iacute;nas y micronutrientes, que requerir&aacute; una normalizaci&oacute;n de la ingesta mediante un adecuado soporte nutricional y est&iacute;mulo del apetito. Tambi&eacute;n suele haber una disminuci&oacute;n en la actividad f&iacute;sica, lo que se traduce en una reducci&oacute;n de la masa muscular esquel&eacute;tica, por lo que debemos estimular en lo posible el ejercicio f&iacute;sico mediante entrenamiento programado. El efecto del tumor, y tambi&eacute;n sus tratamientos espec&iacute;ficos, provocan una inflamaci&oacute;n sist&eacute;mica que afecta a la masa magra celular con da&ntilde;o especial al m&uacute;sculo esquel&eacute;tico, lo que requiere un tratamiento anticatab&oacute;lico que mitigue la inflamaci&oacute;n; asimismo, el tratamiento antineopl&aacute;sico puede reducir la acci&oacute;n proinflamatoria de la masa tumoral. Junto a lo anterior, se debe actuar sobre toda la comorbilidad que incide en el paciente neopl&aacute;sico y que genera balances energ&eacute;ticos y nitrogenados negativos. Ejemplo de lo anterior, entre otros muchos, puede ser la presencia de infecciones asociadas, encamamiento prolongado o depresi&oacute;n reactiva.</font></p>     <p><font face="Verdana" size="2">Por tanto, la acci&oacute;n sobre la caquexia ha de ser combinada, actuando sobre todos los posibles factores causales. Las terapias evaluadas hasta la fecha intentan actuar bien como estimulantes del apetito, frenar la p&eacute;rdida de peso o revertir los cambios corporales que afectan tanto a su composici&oacute;n como a la funci&oacute;n.</font></p>     <p><font face="Verdana" size="2">Se han empleado agentes progestaciones, la droga m&aacute;s utilizada ha sido el acetato de megestrol (AM). Una revisi&oacute;n Cochrane reciente (71) concluye que el AM utilizado en el s&iacute;ndrome de -anorexia-caquexia aumenta el apetito y tiene un ligero efecto sobre la ganancia de peso, sin mejorar la calidad de vida y presentando mayor frecuencia de efectos colaterales en los pacientes tratados con dicha droga. Tambi&eacute;n se ha recurrido a esteroides de tipo prednisolona o dexametasona, con los que se obtiene un aumento del apetito y sensaci&oacute;n de bienestar frente a placebo, sin embargo no se produce una ganancia de peso y como efecto colateral puede tener depleci&oacute;n de la masa muscular (72). Los pacientes con c&aacute;ncer que pierden peso vienen a tener un d&eacute;ficit cal&oacute;rico diario de entre 250-400 kcal (22). En alg&uacute;n estudio se ha sugerido que el empleo de soporte nutricional con dieta energ&eacute;tica de 1,5 kcal/ml e hiperproteica puede conseguir, al menos, la estabilizaci&oacute;n ponderal de los pacientes (73).</font></p>     <p><font face="Verdana" size="2">Tambi&eacute;n se han empleado terapias combinadas. Los antinflamatorios no esteroideos se han utilizado, aunque su mecanismo de acci&oacute;n es poco conocido, si bien las prostaglandinas se han postulado como mediadores de la caquexia. Se ha usado AM con ibuprofeno para estimular el apetito y reducir la inflamaci&oacute;n sist&eacute;mica (74) en sujetos con c&aacute;ncer gastrointestinal, mostrando mayor ganancia de peso que con el uso de AM aislado. Otra asociaci&oacute;n ha sido la nutrici&oacute;n enteral oral junto con EPA, que ha mostrado aumento neto de la ingesta (73) y de la actividad f&iacute;sica (75). No se observaron beneficios en t&eacute;rminos de ganancia de masa magra ni supervivencia, sin embargo an&aacute;lisis <i>post hoc</i> demostraron una relaci&oacute;n linear entre niveles plasm&aacute;ticos de EPA e incremento de la masa magra. Otro tratamiento mixto ha sido el de soporte nutricional (oral y/o intravenoso) junto a indometacina y eritropoyetina para mejorar la anemia (si est&aacute; presente), vi&eacute;ndose mejor&iacute;a metab&oacute;lica, de la composici&oacute;n corporal y de la funci&oacute;n f&iacute;sica (76).</font></p>     <p><font face="Verdana" size="2">Una v&iacute;a de actuaci&oacute;n diferente, sobre la acci&oacute;n de la grelina, est&aacute; siendo estudiada. La grelina estimula el apetito, presenta actividad antinflamatoria y previene de la p&eacute;rdida de masa muscular y grasa en la caquexia cancerosa, por lo que potencialmente puede actuar simult&aacute;neamente por diferentes mecanismos. Sin embargo, su uso est&aacute; muy limitado al tratarse de un p&eacute;ptido que requiere la v&iacute;a parenteral para su administraci&oacute;n y que tiene una vida media de 30 minutos, muy corta. Una alternativa ser&iacute;a el empleo de la anamorelina, agonista del receptor de grelina y que puede emplearse por v&iacute;a oral. En un estudio piloto de dise&ntilde;o cruzado de fase II durante 3 d&iacute;as, la mol&eacute;cula aument&oacute; el apetito, el peso y la calidad de vida en pacientes de c&aacute;ncer con anorexia-caquexia (77). Una publicaci&oacute;n posterior, que integra resultados de dos ensayos cl&iacute;nicos en fase II, analiz&oacute; su acci&oacute;n durante 12 semanas en pacientes con caquexia cancerosa y mostr&oacute; un perfil favorable de la respuesta cl&iacute;nica y aumento de la masa magra (78).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Otras v&iacute;as metab&oacute;licas de acci&oacute;n sobre la caquexia est&aacute;n siendo estudiadas actualmente en ensayos cl&iacute;nicos. Algunas est&aacute;n enfocadas hacia el m&uacute;sculo (miostatina, andr&oacute;genos), otras en la inflamaci&oacute;n (citocinas) o sobre mecanismos de acci&oacute;n no bien dilucidados (inhibidores de la enzima convertidora de la angiotensina, betabloqueantes, etc.).</font></p>     <p><font face="Verdana" size="2">Finalmente, comentaremos brevemente el papel del ejercicio en el paciente con c&aacute;ncer. Muchos enfermos tienen limitada la actividad f&iacute;sica y pasan menos de 3 horas al d&iacute;a de pie o caminando (79). La actividad f&iacute;sica es esencial para regular el anabolismo muscular, el metabolismo energ&eacute;tico y la sensibilidad a la insulina. Se ha sugerido que puede ser una contramedida para prevenir la caquexia y, dependiendo del tipo de ejercicio, restaurar tanto la fuerza como la resistencia muscular. Un ensayo cl&iacute;nico mostr&oacute; que, en pacientes con c&aacute;ncer avanzado, el ejercicio f&iacute;sico es posible y aunque la fatiga no se redujo, el rendimiento f&iacute;sico mejor&oacute; significativamente (80). Se ha sugerido que el ejercicio f&iacute;sico tanto aer&oacute;bico como de resistencia sea incorporado en el tratamiento de la caquexia, sin embargo la experiencia con tales programas es limitada (81).</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Bibliograf&iacute;a</b></font></p>     <!-- ref --><p><font face="Verdana" size="2">1. Evans WJ, Morley JE, Argiles J, et al. Cachexia: a new definition. Clin Nutr 2008;27:793-9.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3935643&pid=S0212-1611201600070000300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">2. Fearon K, Strasser F, Anker SD, et al. Definition and classification of cancer cachexia: an international consensus. Lancet Oncol 2011;12: 489-95.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3935645&pid=S0212-1611201600070000300002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">3. Von Haehling S, Anker SD. Cachexia as a major underestimated and unmet medical need: facts and numbers. J Cachexia Sarcopenia Muscle 2010;1:1-5.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3935647&pid=S0212-1611201600070000300003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    ]]></body>
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<body><![CDATA[<!-- ref --><p><font face="Verdana" size="2">79. Ferriolli E, Skipworth RJ, Hendry P, Scott A, Stensteth J, Dahale M, et al. Physical activity monitoring: a responsive and meaningful patient-centered outcome for surgery, chemotherapy, or radiotherapy? J. Pain Symptom Manage 2012;43:1025-35.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3935799&pid=S0212-1611201600070000300079&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">80. Oldervoll LM, Loge JH, Lydersen S, Paltiel H, Nygaard UV, Oredalen, et al. Physical exercise for cancer patients with advanced disease: a randomized controlled trial. Oncologist 2011;16:1649-1657.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3935801&pid=S0212-1611201600070000300080&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    <!-- ref --><p><font face="Verdana" size="2">81. Argilés JM, Busquets S, L&oacute;pez-Soriano FJ, Costelli P, Penna F. Are there any benefits of exercise training in cancer cachexia? J. Cachexia Sarcopenia Muscle 2010;3:73-6.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3935803&pid=S0212-1611201600070000300081&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><a href="#top"><img border="0" src="/img/revistas/nh/v33s1/seta.gif" width="15" height="17"></a><a name="bajo"></a><b>Direcci&oacute;n para correspondencia:</b>    <br>Alberto Mij&aacute;n de la Torre.    ]]></body>
<body><![CDATA[<br>Unidad de Nutrici&oacute;n Cl&iacute;nica,    <br>Servicio de Medicina Interna.    <br>Hospital Universitario de Burgos.    <br>Avda. Islas Baleares, 3.    <br>09006 Burgos    <br>e-mail: <a href="mailto:amijan@saludcastillayleon.es">amijan@saludcastillayleon.es</a></font></p>      ]]></body><back>
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