<?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>0121-0793</journal-id>
<journal-title><![CDATA[Iatreia]]></journal-title>
<abbrev-journal-title><![CDATA[Iatreia]]></abbrev-journal-title>
<issn>0121-0793</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-07932002000200003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Revisión de tema Citogenética de tumores sólidos]]></article-title>
<article-title xml:lang="en"><![CDATA[CYTOGENETICS OF SOLID TUMORS]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MUÑETÓN PEÑA]]></surname>
<given-names><![CDATA[CARLOS MARIO]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[RAMÍREZ CASTRO]]></surname>
<given-names><![CDATA[JOSÉ LUIS]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2002</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2002</year>
</pub-date>
<volume>15</volume>
<numero>2</numero>
<fpage>86</fpage>
<lpage>95</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-07932002000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-07932002000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-07932002000200003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[EL ANÁLISIS CITOGENÉTICO DE TUMORES ha proporcionado valiosa información sobre la biología del cáncer. Se ha establecido que más de la mitad de los tumores sólidos presentan alteraciones cromosómicas; por lo tanto, el análisis citogenético es de gran utilidad para el diagnóstico y el pronóstico. La identificación de cambios cromosómicos específicos recurrentes en numerosos tumores se considera un indicador de importancia clínica. Los estudios en este campo han revelado cerca de 100.000 alteraciones cromosómicas en más de 30.000 neoplasias humanas. Sin embargo, los tumores sólidos son los menos caracterizados citogenéticamente, sólo una tercera parte del total de ellos, debido a problemas técnicos en los cultivos celulares. La citogenética convencional ha sido muy útil para la posterior caracterización molecular de nuevos oncogenes y genes supresores de tumores involucrados en la génesis tumoral. En esta revisión se presentan algunos aspectos relacionados con el cáncer de etiología cromosómica, tipos de alteraciones cromosómicas, origen, frecuencia, técnicas modernas para su estudio, así como el impacto en el diagnóstico y el pronóstico del cáncer.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[CYTOGENETIC ANALYSIS OF TUMORS has provided valuable information on the biology of cancer. It has been established that more than half of solid tumors show chromosomal anomalies; therefore, cytogenetic analysis is of great usefulness for diagnostic and prognostic purposes. Identification of recurrent chromosomal anomalies in numerous tumors has been considered as an indicador of clinical importance. Cytogenetic studies in tissue tumors have revealed near 100,000 clonal chromosome abnormalities belonging to more that 30,000 human neoplasms. However, due to technical difficulties in cell cultures, only one third of solid tumors have been cytogenetically characterized. Conventional cytogenetics has been very useful for molecular characterization of new oncogenes and tumor-suppressor genes involved in human tumorigenesis. In this review, some important issues related with tumors of chromosomal etiology, the diverse types of chromosomal anomalies with their frequencies, modern diagnostic techniques as well as their impact on the diagnosis and prognosis of cancer are presented.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ALTERACIONES CROMOSÓMICAS]]></kwd>
<kwd lng="es"><![CDATA[CITOGENÉTICA]]></kwd>
<kwd lng="es"><![CDATA[TUMORES SÓLIDOS]]></kwd>
<kwd lng="es"><![CDATA[CARIOTIPO]]></kwd>
<kwd lng="es"><![CDATA[CÁNCER]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>INVESTIGACI&Oacute;N ORIGINAL</b> </font></p>     <p>&nbsp;</p>     <p align="center"><font size="4" face="Verdana, Arial, Helvetica, sans-serif"><b>Revisi&oacute;n de tema   Citogen&eacute;tica de tumores s&oacute;lidos</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>CYTOGENETICS OF SOLID TUMORS</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <b>CARLOS MARIO MU&Ntilde;ET&Oacute;N PE&Ntilde;A<sup>1</sup>; JOS&Eacute; LUIS RAM&Iacute;REZ CASTRO</b></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <sup>1</sup> Bi&oacute;logo. MSc, JOS&Eacute; LUIS RAM&Iacute;REZ CASTRO, M&eacute;dico, MS. Profesores, Unidad de Gen&eacute;tica   M&eacute;dica, Facultad de Medicina, Universidad de Antioquia, Medell&iacute;n, Colombia.   Financiaci&oacute;n: CODI-U. de A. CIM 9956.</font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>EL AN&Aacute;LISIS CITOGEN&Eacute;TICO DE TUMORES</b> ha proporcionado valiosa informaci&oacute;n   sobre la biolog&iacute;a del c&aacute;ncer. Se ha establecido que m&aacute;s de la mitad de los   tumores s&oacute;lidos presentan alteraciones cromos&oacute;micas; por lo tanto, el an&aacute;lisis   citogen&eacute;tico es de gran utilidad para el diagn&oacute;stico y el pron&oacute;stico. La identificaci&oacute;n   de cambios cromos&oacute;micos espec&iacute;ficos recurrentes en numerosos tumores se   considera un indicador de importancia cl&iacute;nica. Los estudios en este campo han   revelado cerca de 100.000 alteraciones cromos&oacute;micas en m&aacute;s de 30.000 neoplasias   humanas. Sin embargo, los tumores s&oacute;lidos son los menos caracterizados   citogen&eacute;ticamente, s&oacute;lo una tercera parte del total de ellos, debido a problemas   t&eacute;cnicos en los cultivos celulares. La citogen&eacute;tica convencional ha sido muy &uacute;til para   la posterior caracterizaci&oacute;n molecular de nuevos oncogenes y genes supresores de   tumores involucrados en la g&eacute;nesis tumoral. En esta revisi&oacute;n se presentan algunos   aspectos relacionados con el c&aacute;ncer de etiolog&iacute;a cromos&oacute;mica, tipos de alteraciones   cromos&oacute;micas, origen, frecuencia, t&eacute;cnicas modernas para su estudio, as&iacute; como el impacto en el diagn&oacute;stico y el pron&oacute;stico del c&aacute;ncer. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>PALABRAS CLAVE</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i> ALTERACIONES CROMOS&Oacute;MICAS,    CITOGEN&Eacute;TICA,     TUMORES S&Oacute;LIDOS,   CARIOTIPO,   C&Aacute;NCER</i>   </font></p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>SUMMARY</b>    </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>CYTOGENETIC ANALYSIS OF TUMORS </b>has provided   valuable information on the biology of cancer. It has   been established that more than half of solid tumors   show chromosomal anomalies; therefore,   cytogenetic analysis is of great usefulness for   diagnostic and prognostic purposes. Identification   of recurrent chromosomal anomalies in numerous   tumors has been considered as an indicador of   clinical importance. Cytogenetic studies in tissue   tumors have revealed near 100,000 clonal   chromosome abnormalities belonging to more that   30,000 human neoplasms. However, due to   technical difficulties in cell cultures, only one third   of solid tumors have been cytogenetically   characterized. Conventional cytogenetics has been   very useful for molecular characterization of new   oncogenes and tumor-suppressor genes involved in   human tumorigenesis. In this review, some   important issues related with tumors of   chromosomal etiology, the diverse types of   chromosomal anomalies with their frequencies,   modern diagnostic techniques as well as their impact   on the diagnosis and prognosis of cancer are   presented.</font></p> <hr noshade size="1">     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>INTRODUCCI&Oacute;N</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> DESDE HACE M&Aacute;S DE TRES D&Eacute;CADAS</b> se han acumulado   evidencias del papel fundamental de las alteraciones   cromos&oacute;micas en el proceso de transformaci&oacute;n de   una c&eacute;lula normal hacia un estado maligno &#40;1,2&#41;.   En 1890 el pat&oacute;logo David Hansemann &#40;3&#41; hizo el   primer estudio de tejidos tumorales, y observ&oacute; la   presencia de mitosis aberrantes en sus c&eacute;lulas,   sugiriendo que este fen&oacute;meno podr&iacute;a utilizarse como   un criterio para el diagn&oacute;stico de un estado maligno.   Posteriormente, Theodor Boveri en 1914 &#40;4&#41;   propuso la teor&iacute;a de la mutaci&oacute;n som&aacute;tica, y el origen   clonal de las neoplasias. Seg&uacute;n dicha teor&iacute;a, el c&aacute;ncer   se desarrolla a partir de una c&eacute;lula individual que   presenta cambios gen&eacute;ticos, en especial un   desequilibrio en la dotaci&oacute;n cromos&oacute;mica. Sin   embargo, esta teor&iacute;a permaneci&oacute; por largo tiempo   sin evaluar cr&iacute;ticamente por falta de t&eacute;cnicas   apropiadas para su estudio. Con los avances en las   t&eacute;cnicas de cultivo para la obtenci&oacute;n de cromosomas   metaf&aacute;sicos, r&aacute;pidamente se confirm&oacute; la hip&oacute;tesis   de Boveri, la cual constituye en la actualidad un   punto clave en la patog&eacute;nesis del c&aacute;ncer.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En 1960 Nowell y Hungerford &#40;5&#41; informaron la   primera alteraci&oacute;n cromos&oacute;mica asociada con un   tipo de c&aacute;ncer en humanos, la leucemia mieloide   cr&oacute;nica &#40;LMC&#41;; el cromosoma marcador se denomin&oacute;   cromosoma Filadelfia &#40;Ph<sup>1</sup>&#41;. Este descubrimiento   de los a&ntilde;os 60 fue de gran impacto en la   citogen&eacute;tica del c&aacute;ncer, pues corrobor&oacute; las observaciones   previas de Hansemann y Boveri, y adem&aacute;s   gener&oacute; un notable inter&eacute;s por parte de numerosos   investigadores. Pocos a&ntilde;os despu&eacute;s Levan y Van   Steenis &#40;6,7&#41; en dos estudios independientes,   encontraron una clara evidencia de que los   cromosomas mostraban una tendencia a aumentar   o disminuir en n&uacute;mero en diferentes tipos de   tumores s&oacute;lidos, principalmente carcinomas   mamario, g&aacute;strico, uterino y ov&aacute;rico.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Debe anotarse que en &eacute;pocas pasadas los estudios   de tumores mostraban cromosomas con una   morfolog&iacute;a de baja calidad, lo cual imped&iacute;a el   reconocimiento de los mismos y de sus regiones   espec&iacute;ficas. Adem&aacute;s, exist&iacute;an dificultades t&eacute;cnicas   en cuanto al cultivo y procesamiento de los tejidos   tumorales &#40;8&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los problemas t&eacute;cnicos antes mencionados, que   adem&aacute;s estaban relacionados con la citogen&eacute;tica   humana en general, se solucionaron en gran parte   en 1970, con el desarrollo de las t&eacute;cnicas de bandeo   cromos&oacute;mico por Caspersson y colaboradores &#40;9&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Gracias a las mismas ocurri&oacute; un avance notable en   los an&aacute;lisis cromos&oacute;micos de diferentes tipos de   muestras y fue posible la identificaci&oacute;n y clasificaci&oacute;n   de cada cromosoma seg&uacute;n los patrones de bandeo.   En 1973 Rowley &#40;10&#41; observ&oacute; que el cromosoma   Filadelfia se originaba de una translocaci&oacute;n que   compromet&iacute;a los cromosomas 9 y 22, t&#40;9;22&#41;   &#40;q34;11&#41;; m&aacute;s tarde se determin&oacute; que en la regi&oacute;n   de ruptura se alteraban la estructura y la funci&oacute;n de   un oncog&eacute;n.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> A partir de dichos avances se logr&oacute; un progreso   significativo en la identificaci&oacute;n de numerosas   alteraciones cromos&oacute;micas en diferentes tipos de   tumores &#40;11-13&#41;. Actualmente es posible determinar   sitios de ruptura en un gran n&uacute;mero de   translocaciones cromos&oacute;micas y adem&aacute;s correlacionar   ciertas regiones y bandas con procesos de   transformaci&oacute;n maligna &#40;14&#41;. Estos avances no s&oacute;lo   son importantes en el campo de la citogen&eacute;tica del c&aacute;ncer, sino tambi&eacute;n, en otras &aacute;reas como la   hematolog&iacute;a, la oncolog&iacute;a y la patolog&iacute;a.   </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>CONCEPTOS GENERALES</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> EN LA ACTUALIDAD NUMEROSOS ESTUDIOS</b> en humanos   establecen una clara asociaci&oacute;n de las alteraciones   cromos&oacute;micas con los tumores s&oacute;lidos y blandos de   diferente origen histol&oacute;gico. Muchas de ellas se   consideran marcadores espec&iacute;ficos para un gran   n&uacute;mero de neoplasias &#40;15-17&#41;. Lo anterior no s&oacute;lo   es importante para un mejor diagn&oacute;stico cl&iacute;nico, sino   tambi&eacute;n para el pron&oacute;stico y el tratamiento de   determinada entidad &#40;18,19&#41;. Entre los diferentes   mecanismos en la etiolog&iacute;a del c&aacute;ncer, las alteraciones   cromos&oacute;micas juegan un papel importante,   puesto que la mayor&iacute;a de los tumores exhiben un   cariotipo anormal &#40;8, 11,20-23&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La citogen&eacute;tica del c&aacute;ncer es un &aacute;rea que se ha   especializado en la identificaci&oacute;n de los cambios   num&eacute;ricos y estructurales de los cromosomas en   diferentes neoplasias humanas. Hasta el presente   las leucemias son las m&aacute;s estudiadas &#40;18,21&#41;, pero   tambi&eacute;n se han identificado numerosas alteraciones   cromos&oacute;micas en linfomas, tumores s&oacute;lidos y   blandos, tanto malignos como benignos, la mayor&iacute;a   de ellas muy complejas &#40;24&#41;. </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En las &uacute;ltimas d&eacute;cadas se ha concluido que las   alteraciones cromos&oacute;micas tienen un origen clonal,   es decir, la formaci&oacute;n de una poblaci&oacute;n de c&eacute;lulas   que proviene de una misma c&eacute;lula progenitora y con   una dotaci&oacute;n cromos&oacute;mica anormal, la cual no   ocurre al azar &#40;4,21,25&#41;. Hallazgos recientes   muestran c&oacute;mo el funcionamiento anormal del   tel&oacute;mero favorece la aparici&oacute;n de alteraciones   cromos&oacute;micas complejas en tumores s&oacute;lidos,   concluyendo que la disfunci&oacute;n del mismo promueve   la inestabilidad gen&oacute;mica como un evento temprano   en la g&eacute;nesis tumoral &#40;26&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Peri&oacute;dicamente se informan en la literatura mundial   nuevas alteraciones cromos&oacute;micas identificadas en   las neoplasias humanas. Este tipo de informaci&oacute;n   se sistematiz&oacute; y se recopil&oacute; en una base de datos   Catalog of Chromosome Aberrations in Cancer. La   primera edici&oacute;n de 1987 registraba alteraciones   cromos&oacute;micas en m&aacute;s de 8.000 neoplasias humanas   analizadas con t&eacute;cnicas de bandeo &#40;27&#41;. La sexta   edici&oacute;n del mismo cat&aacute;logo &#40;1998&#41; contiene   informaci&oacute;n sobre m&aacute;s de 30.000 alteraciones,   recopilada de cerca de 7.000 art&iacute;culos publicados   hasta entonces en la literatura &#40;28&#41;. Estas   observaciones aportan una informaci&oacute;n valiosa   acerca de la naturaleza cromos&oacute;mica de numerosos   tumores. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Mitelman y Levan en 1981 &#40;14&#41;, en una revisi&oacute;n de   1.871 casos de tumores, concluyeron que por lo   menos 15 de los 24 cromosomas humanos, presentan   alteraciones directamente comprometidas con   la g&eacute;nesis de diferentes neoplasias humanas. Cinco   a&ntilde;os despu&eacute;s Mitelman &#40;29&#41; en un estudio de 5,345   casos inform&oacute; 77 alteraciones cromos&oacute;micas   diferentes observadas en todos los cromosomas   humanos, excepto los sexuales. De estos casos se   concluy&oacute; que determinados segmentos cromos&oacute;micos   contienen genes que activan los mecanismos   iniciales del tumor. Dichos genes se conocen como   protooncogenes, genes supresores de tumores y   genes reguladores del ciclo celular; todos ellos se   encuentran distribuidos en los diferentes cromosomas   humanos y tienen una relaci&oacute;n directa con el   c&aacute;ncer &#40;23,30&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">A mediados de 1990 se hab&iacute;an informado estudios   citogen&eacute;ticos de 14.141 casos de c&aacute;ncer &#40;31&#41;; la   mayor&iacute;a de &eacute;stos &#40;68&#37;&#41; correspond&iacute;an a trastornos   hematol&oacute;gicos, 21&#37; a tumores s&oacute;lidos y 11&#37; a   linfomas. El bajo porcentaje de tumores s&oacute;lidos es   explicable por las limitaciones t&eacute;cnicas y el poco &eacute;xito   obtenido en el cultivo de c&eacute;lulas de los mismos &#40;entre   15-30&#37;&#41;. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>ALTERACIONES   CROMOS&Oacute;MICAS   RECURRENTES Y   CLASIFICACI&Oacute;N DE   TUMORES S&Oacute;LIDOS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> EN LA ACTUALIDAD CERCA DE 600 ALTERACIONES</b>   cromos&oacute;micas recurrentes se asocian con   tumores de determinado de origen histol&oacute;gico;   por ejemplo, en el carcinoma mamario los cambios   cromos&oacute;micos ocurren con mayor frecuencia en   los cromosomas 1,3,6,13,17 y en el c&aacute;ncer   de colon en los cromosomas 5, 17 y 18   &#40;8,13,17,25&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los tumores s&oacute;lidos se clasifican seg&uacute;n su origen   histol&oacute;gico, en cinco categor&iacute;as &#40;8,15&#41;:   </font></p> <ol>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Epitelial: colon, recto, mama, &uacute;tero, ovario,     pulm&oacute;n, est&oacute;mago, ri&ntilde;&oacute;n, vejiga y pr&oacute;stata.</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Mes&eacute;nquima: lipomas, liposarcomas, sarcoma     sinovial, rabdomiosarcoma alveolar.   </font></li>       ]]></body>
<body><![CDATA[<li><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Neurog&eacute;nico: meningiomas, gliomas,     neuroblastomas, retinoblastoma y neuroepitelioma</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  C&eacute;lulas germinales: teratomas de test&iacute;culo,     ovario y seminomas.</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Tumores de origen histol&oacute;gico desconocido:     sarcoma de Ewing, melanoma.</font></li>     </ol>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> De los tumores epiteliales humanos hay una mayor   probabilidad de obtener cultivos exitosos, son   los mejor caracterizados citogen&eacute;ticamente, y el   47&#37; de los mismos tienen un cariotipo con   alteraciones espec&iacute;ficas en los cromosomas 3,8 y   12 &#40;8&#41;. En general, se han estudiado tanto   tumores s&oacute;lidos benignos &#40;lipomas, leiomiomas,   adenomas&#41; como malignos &#40;carcinoma mamario,   de pulm&oacute;n, de ovario, de pr&oacute;stata, de colon,   sarcomas&#41;; en los benignos se observan cambios   cromos&oacute;micos simples, mientras que en los   malignos se identifican cariotipos complejos con   m&uacute;ltiples alteraciones &#40;16,17&#41;. Esto &uacute;ltimo tiene   inter&eacute;s puesto que dichos tumores tienen mal   pron&oacute;stico y poca respuesta a los tratamientos   &#40;18,19,32&#41;.   </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>TIPOS DE ALTERACIONES   CROMOS&Oacute;MICAS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> LAS ALTERACIONES CROMOS&Oacute;MICAS NUM&Eacute;RICAS</b> y   estructurales identificadas hasta el presente en   tumores s&oacute;lidos y blandos son muy variables, es   decir, citogen&eacute;ticamente presentan una gran   heterogeneidad &#40;15,17,33-36&#41; y se observan con   notable frecuencia; las estructurales se observan   mayor proporci&oacute;n. Ambos tipos juegan   inicialmente un papel importante en el origen de   los tumores. Entre las alteraciones num&eacute;ricas son   comunes la p&eacute;rdida &#40;hipodiploidias, nulisomias,   monosomia&#41; o ganancia de cromosomas   &#40;trisomias, triploidias, tetraploidias&#41;, es decir,   hiperdiploidias &#40;36&#41; &#40;<a href="#t1">tabla 1</a>&#41;. En estas &uacute;ltimas   se observan con frecuencia cromosomas   marcadores o supernumerarios de origen   desconocido dif&iacute;ciles de clasificar por los m&eacute;todos   citogen&eacute;ticos usuales.</font></p>     <p align="center"><a name="t1"></a><img src="/img/revistas/iat/v15n2/v15n2a3t1.jpg"></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Las alteraciones cromos&oacute;micas estructurales   representan el mayor porcentaje de anomal&iacute;as   observadas en tumores. En la <a href="#t2">tabla 2</a> se indican las   m&aacute;s comunes. Las deleciones, p&eacute;rdida de un   segmento cromos&oacute;mico &#40;terminal o intersticial&#41;   pueden comprometer solamente una o pocas bandas   o un segmento cromos&oacute;mico de mayor tama&ntilde;o   &#40;8,13,32&#41;. Los isocromosomas de brazos largos o   cortos tambi&eacute;n son frecuentes en varios tipos de   tumores &#40;31&#41;. Igualmente, las deleciones que   ocurren en ambos extremos de un cromosoma y la   posterior fusi&oacute;n de los mismos &#40;cromosomas en   anillo&#41; se presentan como alteraciones recurrentes   en varios tumores &#40;39&#41; &#40;<a href="#t2">Tabla 2</a>&#41;. </font></p>     ]]></body>
<body><![CDATA[<p align="center"><a name="t2"></a><img src="/img/revistas/iat/v15n2/v15n2a3t2.jpg"></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tanto en los tumores s&oacute;lidos como en los blandos,   los intercambios de material cromos&oacute;mico &#40;translocaciones   balanceadas o no balanceadas&#41; constituyen   un grupo especial entre las alteraciones cromos&oacute;micas,   que alcanza el mayor porcentaje del total de   las alteraciones estructurales observadas. Adem&aacute;s,   un gran de n&uacute;mero de ellas se consideran marcadores   recurrentes en diversos tipos de tumores, por   lo cual brindan gran ayuda para un diagn&oacute;stico   preciso &#40;8,17, 35, 39, 40, 41&#41; &#40;<a href="#t2">Tabla 2</a>&#41;.   </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>RELACI&Oacute;N ENTRE   LAS ALTERACIONES   CROMOS&Oacute;MICAS CON   GENES SUPRESORES   DE TUMORES Y   PROTOONCOGENES</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> LOS CAMBIOS CROMOS&Oacute;MICOS</b> y el posterior desarrollo   de tumores tienen una relaci&oacute;n directa con muchos protooncogenes, genes supresores de tumor y genes   reguladores del ciclo celular &#40;30,42,43&#41;. Las   alteraciones cromos&oacute;micas antes descritas influyen   notablemente en los mecanismos gen&eacute;ticos de tales   genes; cuando se presenta una deleci&oacute;n, &eacute;sta puede   contener genes supresores de tumores o protooncogenes,   dando como resultado una haploinsuficiencia   o desequilibrio en la expresi&oacute;n de estos   genes; por esta v&iacute;a se activan los mecanismos   iniciales de la g&eacute;nesis tumoral. Ejemplos de lo   anterior ocurren con la deleci&oacute;n intersticial 11p13   que contiene el gen WT1 supresor del tumor de   Wilms; la deleci&oacute;n de la banda 13q14, en la cual se   localiza el gen RB responsable del retinoblastoma   en ni&ntilde;os y la deleci&oacute;n 17q13 en la cual se localiza   el gen PT53 relacionado con los carcinomas   g&aacute;strico, mamario, melanoma, de pulm&oacute;n, de ovario   y de colon &#40;8,23,25,35,42&#41;. Por lo tanto, el gen   TP53 est&aacute; bien reconocido como el guardi&aacute;n del   genoma humano. Cabe anotar que las deleciones   que comprometan los loci para los genes p53 y RB   desencadenan la aparici&oacute;n de diferentes tipos de   tumores en m&aacute;s del 50&#37; de los casos &#40;23,36,44&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Por otra parte, las translocaciones conducen a la   transactivaci&oacute;n g&eacute;nica anormal de los tipos de genes   antes mencionados, como ocurre en los casos del   L-myc &#40;1p32&#41; en carcinoma de pulm&oacute;n, el N-ras   &#40;1p11&#41; en neuroblastoma, APC &#40;5q21&#41; en poliposis   del colon, BRCA1 &#40;1p36 y 17q21&#41; en carcinomas   de mama y ovario &#40;29,40,41,45&#41; y la sobreexpresi&oacute;n   del oncogen Her-2/neu en carcinoma de mama &#40;46&#41;.   Tambi&eacute;n, las translocaciones afectan la estructura y   funci&oacute;n de otros genes, como aqu&eacute;llos que codifican   factores de crecimiento &#40;22&#41;. De igual manera,   originan la aparici&oacute;n de genes h&iacute;bridos &#40;genes   fusionados&#41; cuyos productos, prote&iacute;nas quim&eacute;ricas,   aumentan notoriamente la proliferaci&oacute;n celular y   activan mecanismos de la g&eacute;nesis tumoral y sus   posteriores met&aacute;stasis &#40;40,47&#41;. En s&iacute;ntesis, cualquier   cambio en el n&uacute;mero o estructura de los   cromosomas humanos que comprometa el locus o   loci de protooncogenes y/o genes supresores de   tumores, activa los mecanismos para la aparici&oacute;n   de neoplasias en humanos.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>CITOGEN&Eacute;TICA MOLECULAR</b>   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>EN LA ACTUALIDAD SE HAN DESARROLLADO M&Eacute;TODOS</b>   muy especializados de citogen&eacute;tica molecular que   hacen posible un r&aacute;pido an&aacute;lisis de los tumores. Se   destacan la hibridizaci&oacute;n in situ por fluorescencia   &#40;FISH&#41; y sus variantes, la hibridizaci&oacute;n gen&oacute;mica   comparativa &#40;CGH&#41;, el cariotipo espectral &#40;SKY-FISH&#41;   y el multiplex FISH &#40;M-FISH&#41; &#40;48-53&#41;; son t&eacute;cnicas   m&aacute;s precisas y confiables para detectar en forma   r&aacute;pida alteraciones cromos&oacute;micas num&eacute;ricas y   estructurales en n&uacute;cleos interf&aacute;sicos. Muchas de   estas alteraciones no pueden definirse por la   citogen&eacute;tica convencional, cuando &eacute;sta, en algunos   casos, da resultados negativos o confusos. Por lo   tanto, las t&eacute;cnicas mencionadas tienen la gran   ventaja de identificar translocaciones cr&iacute;pticas y   reordenamientos cromos&oacute;micos complejos, y definir   la procedencia de segmentos cromos&oacute;micos   involucrados en un gran n&uacute;mero de reordenamientos,   as&iacute; como para el an&aacute;lisis de la actividad de   genes supresores de tumores y oncogenes en   n&uacute;cleos interf&aacute;sicos de tejidos tumorales &#40;54-57&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Con los avances en las t&eacute;cnicas de citogen&eacute;tica   molecular ha sido posible clonar genes localizados   en numerosos sitios de ruptura en diferentes tipos   de translocaciones cromos&oacute;micas presentes en   neoplasias &#40;40&#41;. Adem&aacute;s, empleando t&eacute;cnicas de   biolog&iacute;a molecular se han identificado m&aacute;s de 100   genes fusionados &#40;genes h&iacute;bridos&#41;, como resultado   de translocaciones, en trastornos hematol&oacute;gicos y   en una variedad de tumores s&oacute;lidos &#40;58&#41;. </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Otros estudios m&aacute;s espec&iacute;ficos que se efect&uacute;an en   los tumores son los an&aacute;lisis de ADN utilizando PCRSSCP   y secuenciamiento, lo cual permite identificar   mutaciones puntuales en genes asociados con el   c&aacute;ncer &#40;TP 53,RB, Myc, entre muchos otros&#41;   &#40;59,60&#41;. Una de las mayores ventajas que presentan   estas t&eacute;cnicas moleculares es la posibilidad de hacer   an&aacute;lisis retrospectivos en muestras incluidas en   parafina, fijadas en formol o almacenadas a -70&#176; C.   Por lo tanto, las t&eacute;cnicas descritas se consideran de   gran ayuda para el diagn&oacute;stico molecular, la   clasificaci&oacute;n, el pron&oacute;stico y la monitorizaci&oacute;n de   diferentes tumores.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Finalmente, en la actualidad los estudios citogen&eacute;ticos   de tejidos neopl&aacute;sicos cobran un gran inter&eacute;s   por sus grandes aportes al Cancer Genome Anatomy   Project &#40;CGAP&#41; &#40;61&#41;, un proyecto colaborativo   internacional creado en 1997 por el Instituto   Nacional de C&aacute;ncer de Estados Unidos, dirigido a   completar el cat&aacute;logo de cambios gen&eacute;ticos   relacionados con el c&aacute;ncer. Este ambicioso proyecto   tiene como misi&oacute;n descifrar la anatom&iacute;a molecular   del c&aacute;ncer, en cuanto a los cambios gen&eacute;ticos que   ocurren durante su formaci&oacute;n y progresi&oacute;n. Dentro de este proyecto tambi&eacute;n se incluye el Cancer   Chromosome Aberration Project. En ambos   proyectos se est&aacute;n empleando t&eacute;cnicas muy   refinadas para acelerar los estudios que permitan   un mejor entendimiento de los mecanismos   moleculares del c&aacute;ncer. Informaci&oacute;n sobre estos   proyectos es de libre acceso al p&uacute;blico en internet   &#40;62&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Como conclusi&oacute;n, debe tenerse en cuenta la   importancia de los estudios cromos&oacute;micos en   cualquier tipo de neoplasia &#40;leucemia, linfoma,   tumores s&oacute;lidos y blandos&#41; con el fin de obtener   una mejor informaci&oacute;n acerca del espectro de   alteraciones y la identificaci&oacute;n de anomal&iacute;as   cromos&oacute;micas recurrentes espec&iacute;ficas durante el   proceso de transformaci&oacute;n maligna. Adem&aacute;s, la   posibilidad de correlacionar estos estudios con los   hallazgos histopatol&oacute;gicos, puesto que se tendr&iacute;a   una informaci&oacute;n complementaria que ayudar&iacute;a en   el diagn&oacute;stico y pron&oacute;stico de los pacientes con   diferentes tumores. Por otra parte, estimular   investigaciones multidisciplinarias en este campo   que aporten nuevos conocimientos acerca de la   biolog&iacute;a del c&aacute;ncer.   </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>BIBLIOGRAF&Iacute;A</b>   </font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1. Sandberg  AA, Yamada K. Chromosomes and cancer.   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