<?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>0121-0807</journal-id>
<journal-title><![CDATA[Revista de la Universidad Industrial de Santander. Salud]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Univ. Ind. Santander. Salud]]></abbrev-journal-title>
<issn>0121-0807</issn>
<publisher>
<publisher-name><![CDATA[Universidad Industrial de Santander]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-08072009000200008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Leucemia mieloide crónica, estado del arte]]></article-title>
<article-title xml:lang="en"><![CDATA[Myeloid cronic leukemia, state of the art]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rey]]></surname>
<given-names><![CDATA[Luz Aída]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montenegro]]></surname>
<given-names><![CDATA[Yenny M.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Industrial de Santander  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Industrial de Santander Escuela de Bacteriología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2009</year>
</pub-date>
<volume>41</volume>
<numero>2</numero>
<fpage>169</fpage>
<lpage>180</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-08072009000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-08072009000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-08072009000200008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La leucemia mieloide crónica es un desorden clonal maligno producido por la translocación genética t(9;22)(q34;q11), que genera hiperplasia en médula ósea y proliferación incontrolada de la línea mieloide en sangre periférica. Hasta 1980, se consideró una enfermedad fatal, sin embargo gracias a los avances científicos se empezaron a dilucidar diferentes estrategias terapéuticas, que han ido desde el trasplante alogénico de médula ósea, hasta el desarrollo de fármacos de última generación como es el caso de los inhibidores tirosin kinasa de primera y segunda generación (Imanitib y Nilotinib), con los cuales se ha obtenido una respuesta positiva hasta en un 95% de los casos que ha obligado a nuevas estrategias diagnósticas y de seguimiento como la fluorescencia por hibridación in situ y las diferentes variantes de la reacción en cadena de la polimerasa; conocer estos avances es fundamental para nuestro desempeños como profesionales de la salud, ya que nos permite actuar y tomar decisiones acertadas para el beneficio del paciente, acordes con los recursos del medio. Salud UIS 2009; 41: 169-180]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Myeloid chronic leukemia is a malignant clonal disorder caused by genetic the translocation t(9; 22) (q34, q11) which generates hyperplasia in bone marrow and uncontrolled myeloid proliferation in peripheral blood. Until 1980, it was considered a fatal disease, however, thanks to scientific progress, scientists began to elucidate different therapeutic strategies, from allogeneic transplantation of bone marrow, to the first and second generation tyrosine kinase inhibitors (Imanitib and Nilotinib), which has provided a positive response in up to 95% of cases. Such development has enforced new diagnostic and monitoring strategies as the fluorescence in situ hybridization and different variants of the polymerase chain reaction. Knowing such advances is fundamental to our performance as health care professionals, allowing us to act and make sound decisions for the benefit of the patient, according to available resources. Salud UIS 2009; 41: 169-180]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Leucemia mieloide crónica BCR-ABL positiva]]></kwd>
<kwd lng="es"><![CDATA[translocación genética]]></kwd>
<kwd lng="es"><![CDATA[síndrome mieloproliferativo]]></kwd>
<kwd lng="es"><![CDATA[imatinib]]></kwd>
<kwd lng="en"><![CDATA[Leukemia myelogenous chronic]]></kwd>
<kwd lng="en"><![CDATA[BCR-ABL positive]]></kwd>
<kwd lng="en"><![CDATA[translocation genetic]]></kwd>
<kwd lng="en"><![CDATA[myeloproliferative syndromes]]></kwd>
<kwd lng="en"><![CDATA[imatinib]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font size="2" face="Verdana">     <p align="center"><font size="4"><b>Leucemia mieloide cr&oacute;nica,    <br> estado del arte</b></font></p>      <p align="center">Luz A&iacute;da Rey<sup>1</sup>; Yenny M. Montenegro<sup>2</sup></p> 	     <p align="left">1. Bacteri&oacute;loga. Universidad Industrial de Santander, Email:    <br>  2. Bacteri&oacute;loga MSc Ciencias B&aacute;sicas Biom&eacute;dicas. Docente Escuela de Bacteriolog&iacute;a, Universidad Industrial de Santander.    <br> <b>Correspondencia:</b>    <br>  Yenny M. Montenegro Medina. Bacteri&oacute;loga Msc Ciencias B&aacute;sicas Biom&eacute;dicas. Docente Escuela de Bacteriolog&iacute;a. Universidad    <br>  Industrial De Santander. Email:<a href="mailto:yenny_mmm@yahoo.com">yenny_mmm@yahoo.com</a> Tel: 6384000 Ext: 3135.    <br> <b>Recibido:</b> 20 enero de 2009 <b>-Aceptado:</b> 11 de marzo de 2009</p>  <hr>      ]]></body>
<body><![CDATA[<p align="center"><font size="3"><b>RESUMEN</b></font></p> 	     <p align="justify">La leucemia mieloide cr&oacute;nica es un desorden clonal maligno producido por la translocaci&oacute;n gen&eacute;tica t(9;22)(q34;q11), que genera hiperplasia en m&eacute;dula &oacute;sea y proliferaci&oacute;n incontrolada de la l&iacute;nea mieloide en sangre perif&eacute;rica. Hasta 1980, se consider&oacute; una enfermedad fatal, sin embargo gracias a los avances cient&iacute;ficos se empezaron a dilucidar diferentes estrategias terap&eacute;uticas, que han ido desde el trasplante alog&eacute;nico de m&eacute;dula &oacute;sea, hasta el desarrollo de f&aacute;rmacos de &uacute;ltima generaci&oacute;n como es el caso de los inhibidores tirosin kinasa de primera y segunda generaci&oacute;n (Imanitib y Nilotinib), con los cuales se ha obtenido una respuesta positiva hasta en un 95&#37; de los casos que ha obligado a nuevas estrategias diagn&oacute;sticas y de seguimiento como la fluorescencia por hibridaci&oacute;n <i>in situ</i> y las diferentes variantes de la reacci&oacute;n en cadena de la polimerasa; conocer estos avances es fundamental para nuestro desempe&ntilde;os como profesionales de la salud, ya que nos permite actuar y tomar decisiones acertadas para el beneficio del paciente, acordes con los recursos del medio. <b><i>Salud UIS</i> 2009; 41: 169-180</b></p> 	     <p align="justify"><b>Palabras Clave:</b> Leucemia mieloide cr&oacute;nica BCR-ABL positiva, translocaci&oacute;n gen&eacute;tica, s&iacute;ndrome mieloproliferativo, imatinib</p>      <p align="center"><font size="3"><b>Myeloid cronic leukemia, state of the art</b></font></p> 	     <p align="center"><font size="3"><b>ABSTRACT</b></font></p> 	     <p align="justify">Myeloid chronic leukemia is a malignant clonal disorder caused by genetic the translocation t(9; 22) (q34, q11) which generates hyperplasia in bone marrow and uncontrolled myeloid proliferation in peripheral blood. Until 1980, it was considered a fatal disease, however, thanks to scientific progress, scientists began to elucidate different therapeutic strategies, from allogeneic transplantation of bone marrow, to the first and second generation tyrosine kinase inhibitors (Imanitib and Nilotinib), which has provided a positive response in up to 95&#37; of cases. Such development has enforced new diagnostic and monitoring strategies as the fluorescence <i>in situ</i> hybridization and different variants of the polymerase chain reaction. Knowing such advances is fundamental to our performance as health care professionals, allowing us to act and make sound decisions for the benefit of the patient, according to available resources. <b><i>Salud UIS</i> 2009; 41: 169-180</b></p> 	     <p align="justify"><b>Keywords:</b> Leukemia myelogenous chronic, BCR-ABL positive, translocation genetic, myeloproliferative syndromes, imatinib</p>  <hr> 	     <p align="center"><font size="3"><b>INTRODUCCI&Oacute;N</b></font></p>      <p align="justify">La leucemia mieloide cr&oacute;nica (LMC) es un s&iacute;ndrome mieloproliferativo cr&oacute;nico (SMPC) de naturaleza clonal y con origen en una c&eacute;lula madre pluripotencial (CMP) com&uacute;n a tres series hematopoy&eacute;ticas. Los s&iacute;ntomas m&aacute;s comunes son: fatiga, anorexia y p&eacute;rdida de peso, pero entre el 40 y 50&#37; de los pacientes son asintom&aacute;ticos al momento del diagn&oacute;stico<sup>1, 2</sup>.</p>      <p align="justify">La LMC, representa entre el 15 y el 20&#37; del total de las leucemias diagnosticadas y su incidencia en Europa y Estados Unidos es de 1 a 2 casos/100,000 habitantes/ a&ntilde;o. Predomina ligeramente en varones (1,3 hombres por cada mujer) y la edad promedio de aparici&oacute;n es de 53 a&ntilde;os. Entre el 12 y el 30&#37; son mayores de 59 a&ntilde;os y aproximadamente el 10&#37; de los casos se presenta en ni&ntilde;os y adolescentes menores de 20 (<a href="img/revistas/suis/v41n2/v41n2a08f1.jpg" target="_blank"><b>Figura 1</b></a>)<sup>1-3</sup>. En Colombia, se informan entre 400 y 800 casos anualmente y existen a la fecha entre 2000 y 3200 pacientes con la enfermedad<sup>3</sup>, pero no existen datos precisos; en Santander, de acuerdo con el Observatorio de Salud P&uacute;blica, a pesar de no tener datos espec&iacute;ficos sobre LMC, se logr&oacute; establecer que se diagnosticaron m&aacute;s de 420 casos de leucemia en los servicios de consulta s&oacute;lo en el 2005, con una incidencia en Bucaramanga y el &aacute;rea metropolitana de 11,3 casos/100,000 habitantes/ a&ntilde;o<sup>3</sup>. Si asumimos un porcentaje de diagn&oacute;stico similar al mundial y estimamos la LMC como el 20&#37; de los casos en nuestra poblaci&oacute;n, podr&iacute;amos decir que en Santander durante el 2005 pudieron haberse presentado 84 casos de LMC (2,26 casos/100,000 habitantes/a&ntilde;o).</p>      ]]></body>
<body><![CDATA[<p align="justify">La LMC fue la primera enfermedad humana asociada a una anormalidad citogen&eacute;tica espec&iacute;fica &quot;El Cromosoma Filadelfia (Ph)&quot;, presente en m&aacute;s del 95&#37; de los casos y directamente relacionado con la iniciaci&oacute;n, progresi&oacute;n, manifestaciones cl&iacute;nicas y terap&eacute;utica de la enfermedad. Este cromosoma ha sido tambi&eacute;n identificado en el 5&#37; de los ni&ntilde;os con leucemia linfoide aguda (LLA) y en el 15 a 30&#37; de los adultos con esta misma enfermedad; tambi&eacute;n se encuentra presente en el 2&#37; de los casos de leucemia mieloide aguda (LMA)<sup>1-5</sup>. Es importante  mencionar que a medida que progresa la enfermedad, las c&eacute;lulas oncog&eacute;nicas son gen&eacute;ticamente m&aacute;s inestables, lo cual, acompa&ntilde;ado de la alta tasa de proliferaci&oacute;n conduce a la acumulaci&oacute;n de otras anormalidades cromos&oacute;micas (<a href="img/revistas/suis/v41n2/v41n2a08t1.jpg" target="_blank"><b>Tabla 1</b></a>). A este proceso se le conoce como evoluci&oacute;n clonal (EC) y es considerado de mal pron&oacute;stico, ya que afecta la diferenciaci&oacute;n celular y conduce a la transformaci&oacute;n de 2/3 de los casos de LMC como LMA y los restantes como LLA<sup>1-5</sup>.</p>      <p align="justify"><b>Etiolog&iacute;a de la enfermedad</b>    <br> El cromosoma Ph resulta de la translocaci&oacute;n reciproca entre los brazos largos de los cromosomas 9 y 22, t(9;22)(q34;q11) (<a href="#f02"><b>Figura 2</b></a>), implicando el traslado del segmento 3&#39; del protooncogen abl (Abelson) desde cromosoma 9q34 hasta el extremo 5&#39; del gen bcr (breackpoint cluster regi&oacute;n) sobre el cromosoma 22q11<sup>3-5</sup>, creando un gen quim&eacute;rico de fusi&oacute;n bcr-abl con actividad tirosin quinasa constitutiva (activo constantemente)<sup>3-5</sup>y confinada al citoplasma; mientras que el gen normal se encuentra migrando entre el n&uacute;cleo donde tiene actividad antiapoptotica y el citoplasma donde su funci&oacute;n es fosforilar sustratos como: CRKL (<i>oncogen homologo</i> de la prote&iacute;na V-crk del virus <i>CT10</i> del sarcoma aviar), p62Dok (Prote&iacute;na de uni&oacute;n 1, 62kDa, de la tirosin quinasa (1), conocida tambi&eacute;n como DOK1, CBL (oncogen de transformaci&oacute;n antirretroviral murino, CAS-Br-M) y RIN (Prote&iacute;na efectora de RAS, interacci&oacute;n/interferencia) y por tanto, activar m&uacute;ltiples v&iacute;as de se&ntilde;alizaci&oacute;n que intervienen en el crecimiento, adhesi&oacute;n y la diferenciaci&oacute;n celular de la l&iacute;nea hematopoy&eacute;tica como: RAS (sarcoma de rat&oacute;n), RAF ( Proto-oncogen serina/treonina kinasa), AP1 kinasa (factor de trascripci&oacute;n 1), IP3 kinasa (inositol trifosfato kinasa), MYC (Mielocitomatosis) y STAT (traductor de se&ntilde;ales y activador de la trascripci&oacute;n)<sup>1-10</sup> (<a href="#f02"><b>Figura 2</b></a>).</p>      <p align="center"><a name="f02"></a><img src="img/revistas/suis/v41n2/v41n2a08f2.jpg"></p>      <p align="justify">Dependiendo del punto de ruptura en el gen <i>bcr</i>, la prote&iacute;na de fusi&oacute;n BCR-ABL puede variar de tama&ntilde;o pues la ruptura en <i>abl</i> es muy variable, pero siempre se da corriente arriba del ex&oacute;n a2 (<a href="img/revistas/suis/v41n2/v41n2a08f3.jpg" target="_blank"><b>Figura 3</b></a>). Hasta la fecha, han sido identificados 3 puntos de ruptura en <i>bcr</i> denominados: M-BCR (Regi&oacute;n Mayor), m-BCR (Regi&oacute;n Menor) y m-BCR (Regi&oacute;n Micro). La ruptura de mayor frecuencia es M-BCR sobre el intr&oacute;n ubicado entre los exones e13 y e14 (anteriormente exones b2 y b3) o en el intr&oacute;n entre los exones e14 y e15 (anteriormente b3 y b4) generando una prote&iacute;na BCR-ABL de 210Kd (p210<sup>BCR-ABL</sup>); los dos puntos de ruptura dan como resultado quimeras ligeramente diferentes, una e13a2 (&oacute; b2a2) y otra e1a2 (&oacute; b3a2), generalmente se presenta una de las dos; sin embrago aproximadamente el 10&#37; de los pacientes son heterocigotos. Cuando la ruptura es sobre el primer intr&oacute;n de <i>bcr</i> (m-BCR) entre los exones e1 y e2, se transcribe una prote&iacute;na de 190Kd (p190<sup>BCR-ABL</sup>), la cual est&aacute; presente en aproximadamente 2/3 de los pacientes con LLA Ph+. El tercer punto de ruptura ocurre entre los exones e19 y e20 (m-BCR), el ARN producido por esta quimera codifica la prote&iacute;na m&aacute;s larga de las tres, con un tama&ntilde;o de 230Kd (p230<sup>BCR-ABL</sup>) com&uacute;n en leucemia neutrof&iacute;lica cr&oacute;nica asociada a Ph+ <sup>1-12, 18</sup> (<a href="img/revistas/suis/v41n2/v41n2a08f3.jpg" target="_blank"><b>Figura 3</b></a>).</p>      <p align="justify"><b>Historia natural</b>    <br> La historia natural de la LMC est&aacute; dada por una continua progresi&oacute;n desde una fase cr&oacute;nica donde el recuento de leucocitos es alto pero la maduraci&oacute;n es normal, hasta una fase bl&aacute;stica caracterizada por el aumento de blastos en m&eacute;dula &oacute;sea (MO) y sangre perif&eacute;rica (SP) superior al 20&#37; acompa&ntilde;ada de defectos en la maduraci&oacute;n en un periodo no superior a 5 a&ntilde;os cuando no se recibe tratamiento oportuno. La crisis bl&aacute;stica generalmente se encuentra precedida por una fase de aceleraci&oacute;n que se evidencia por una neutrof&iacute;lia marcada y otros signos, tal y como se describe en la (<a href="img/revistas/suis/v41n2/v41n2a08t2.jpg" target="_blank"><b>Tabla 2</b></a>). <sup>1-5,11-12</sup></p>      <p align="justify"><b>Diagnostico</b>    <br> El 80&#37; de los pacientes es diagnosticado en fase cr&oacute;nica<sup>1</sup>. Los signos y s&iacute;ntomas que se presentan com&uacute;nmente son: fatiga(80&#37;), astenia(51&#37;), anorexia(37&#37;), p&eacute;rdida de peso(36&#37;), dolor abdominal y/o saciedad precoz(34&#37;), esplenomegalia(40&#37;) y dolor &oacute;seo(10&#37;); aunque en el 50&#37; de los casos no se manifiesta sintomatolog&iacute;a de importancia al diagn&oacute;stico y &eacute;ste se realiza de forma accidental con el hemograma al hallar: anemia normoc&iacute;tica normocromica, leucocitosis (&gt;25.000 c&eacute;lulas/mm<sup>3</sup>), desviaci&oacute;n a la izquierda de la l&iacute;nea mieloide sin hiato leuc&eacute;mico, linfopenia, basofilia ocasional y, trombocitosis (30-50&#37;)<sup>2-5</sup>.</p>      <p align="justify">Al estudio de MO, esta se encuentra hipercelular y similar a SP. Con frecuencia hay megacariocitosis y la relaci&oacute;n mieloide/eritroide (M:E) est&aacute; elevada. No obstante, la confirmaci&oacute;n del diagnostico se hace con la identificaci&oacute;n del cromosoma Philadelfia (Ph) y/o la detecci&oacute;n de transcritos BCR-ABL por Reacci&oacute;n en Cadena de la Polimerasa (PCR)<sup>11-17</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify">El cariotipo convencional, es hasta ahora la t&eacute;cnica m&aacute;s empleada para el diagn&oacute;stico confirmatorio de la LMC, a pesar de la poca sensibilidad y el advenimiento de la biolog&iacute;a molecular; ya que es la &uacute;nica prueba capaz de detectar la EC<sup>11, 14-17</sup>.</p>      <p align="justify">La fluorescencia por hibridaci&oacute;n <i>in situ</i> (FISH), identifica &quot;microarreglos simples o complejos como &quot;microPh&quot; no detectables por t&eacute;cnicas convencionales de citogen&eacute;tica&quot;; puede realizarse en diferentes sustratos (sangre, m&eacute;dula &oacute;sea, fluidos corporales, tejidos fijados con parafina) y, tiene una especificidad (98&#37;) y sensibilidad (60&#37;) superior al cariotipo, pero no detecta EC y es costosa. Se usa cuando el cariotipo convencional es negativo y en algunos casos como estrategia de seguimiento<sup>11,13</sup>.</p>      <p align="justify">La PCR, detecta una c&eacute;lula BCR-ABL (+) entre 10<sup>5</sup> y 10<sup>6</sup> normales, convirti&eacute;ndose en la herramienta m&aacute;s sensible hasta la fecha y la t&eacute;cnica de elecci&oacute;n para el diagn&oacute;stico en pacientes Ph(-). La PCR en tiempo real, es una modificaci&oacute;n de la PCR convencional que permite cuantificar el n&uacute;mero de trascriptos BCR-ABL circulantes en el paciente; por eso aunque un poco m&aacute;s complejo, es el m&eacute;todo m&aacute;s preciso para llevar a cabo el seguimiento y monitoreo de los pacientes con LMC que est&aacute;n en tratamiento. En Colombia, esta metodolog&iacute;a ya ha sido implementada en ciudades como Bogot&aacute; y Medell&iacute;n<sup>11, 15</sup>.</p>      <p align="justify"><b>Seguimiento</b>    <br> El objetivo del seguimiento es identificar cualquier resistencia al tratamiento en forma temprana, permitiendo dise&ntilde;ar estrategias terap&eacute;uticas alternativas encaminadas a retardar la progresi&oacute;n de la enfermedad. Esta respuesta es medida mediante la evaluaci&oacute;n de tres tipos de respuestas: la hematol&oacute;gica, citogen&eacute;tica y molecular (<a href="img/revistas/suis/v41n2/v41n2a08f4.jpg" target="_blank"><b>Figura 4</b></a>).</p>      <p align="justify"><b>Respuesta hematol&oacute;gica (RH):</b> Se habla de RH, cuando el hemograma empieza a normalizarse (disminuci&oacute;n progresiva de los recuentos leucocitarios). Sin embargo, para hablar de respuesta hematol&oacute;gica completa (RHC), es indispensable que exista un recuento de plaquetas &gt; a 450.000/mm<sup>3</sup>, leucocitos &lt; a 10.000/mm<sup>3</sup>, 0&#37; de c&eacute;lulas inmaduras en SP, bas&oacute;filos &lt; al 5&#37; y normalizaci&oacute;n del tama&ntilde;o del bazo. Se calcula que un paciente en el momento de su diagn&oacute;stico tiene una carga tumoral de 10<sup>12</sup> c&eacute;lulas leuc&eacute;micas en su cuerpo, al obtenerse la RHC esta carga se reduce a 10<sup>11</sup> c&eacute;lulas, siendo &eacute;ste su l&iacute;mite de detecci&oacute;n. El monitoreo hematol&oacute;gico debe realizarse cada dos semanas hasta evidenciar la RHC, y posterior a ella cada 3 meses<sup>1-5,11-23</sup>.</p>      <p align="justify"><b>Respuesta citogen&eacute;tica (RC):</b> Est&aacute; determinada por el porcentaje residual de c&eacute;lulas Ph(+)en metafase, clasific&aacute;ndose como: Ninguna si existen m&aacute;s del 95&#37; de c&eacute;lulas Ph(+), M&iacute;nima de 66-95&#37;, Menor (RCm) de 36-65&#37;, Mayor (RCM) de 1-35&#37; y Completa (RCC) cuando no se detectan c&eacute;lulas Ph(+). El cariotipo se considera la metodolog&iacute;a de elecci&oacute;n para este seguimiento, pues no solo determina la presencia del cromosoma Ph, sino que tambi&eacute;n facilita la detecci&oacute;n de EC. Debe realizarse cada 6 meses<sup>11-19</sup>.</p>      <p align="justify">Se espera que en un paciente que responde &oacute;ptimamente al tratamiento, la RHC deba generarse 3 meses despu&eacute;s de iniciado el tratamiento, la RCm a los 6 meses, la RCM en el transcurso de un a&ntilde;o y en m&aacute;ximo 18 meses, se debe lograr una RCC. Cualquier incumplimiento de estos criterios debe llevar a la reevaluaci&oacute;n y planteamiento de nuevas estrategias terap&eacute;uticas<sup>11-12, 19-22</sup>.</p>      <p align="justify">Un peque&ntilde;o porcentaje de pacientes que alcanzan RCC recaen. La reca&iacute;da surge de la persistencia de c&eacute;lulas malignas por debajo del nivel de detecci&oacute;n por citogen&eacute;tica; este reservorio se conoce como enfermedad m&iacute;nima residual (EMR), la cual corresponde a una carga tumoral por debajo de 10<sup>9</sup> a 10<sup>10</sup> c&eacute;lulas leuc&eacute;micas, y puede ser detectada s&oacute;lo por m&eacute;todos moleculares. Es por esto que el concepto de respuesta molecular debi&oacute; ser incluido<sup>1-5, 19-23</sup>.</p>      <p align="justify"><b>Respuesta molecular (RM):</b> Se conoce como RM, la proporci&oacute;n del gen <i>BCR-ABL</i>, del transcrito o de la prote&iacute;na quim&eacute;rica, dependiendo del m&eacute;todo de detecci&oacute;n, presente en los pacientes con LMC. Existen dos tipos de RM, una respuesta molecular mayor (RMM) que se define como la reducci&oacute;n en m&iacute;nimo 3 log de los transcritos BCR-ABL y una respuesta molecular completa (RMC), entendida como la no detecci&oacute;n del transcritos BCR-ABL en MO y SP<sup>11-15, 22</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify"><b>Tratamiento</b>    <br> Hasta 1980, la LMC se consider&oacute; una enfermedad fatal, sin embargo desde su descripci&oacute;n hasta nuestros tiempos, nuevas estrategias terap&eacute;uticas han surgido para su tratamiento; cada una buscando superar las debilidades de la otra. A continuaci&oacute;n, haremos una breve presentaci&oacute;n de forma cronol&oacute;gica de los principales tratamientos hasta la fecha desarrollados para el tratamiento de la LMC.</p>      <p align="justify"><b>Busulfan (1,4- Butanodiol Dimetilsulfonato):</b> Conocido comercialmente desde 1959 como Myleran (GlaxoSmithKline). Es un agente alkilante, espec&iacute;ficamente un alfil sulfonato que se caracteriza por su capacidad de formar uniones covalentes con sustancias nucleof&iacute;licas y producir iones carbonilo, los cuales reaccionan instant&aacute;neamente con aminas, grupos oxhidrilos y sulfhidrilos, interrumpiendo la s&iacute;ntesis del ADN y la divisi&oacute;n celular, por lo que se le adjudica un efecto inmunosupresor, ya que disminuye los recuentos de leucocitos, controlando las manifestaciones hematol&oacute;gicas de la enfermedad (en el 90&#37; de los casos). Por tanto, mejora la calidad de vida, pero sin retrasar la progresi&oacute;n de la enfermedad. Tiene cierto grado de toxicidad, llegando a generar fibrosis pulmonar<sup>19-22</sup>.</p>      <p align="justify"><b>Hidroxiuria (CH<sub>4n202</sub>) o hidroxicarbamida:</b> es un antimetab&ograve;lico an&aacute;logo de la &uacute;rea conocido comercialmente como Droxia o Hydrea. Inhibe la ribonucle&oacute;tido-reductasa, enzima que transforma los ribonucle&oacute;tidos en desoxirribonucle&oacute;tidos; por lo cual impide la s&iacute;ntesis de ADN y con ello la replicaci&oacute;n celular. Se desarroll&oacute; como una alternativa m&aacute;s segura en el tratamiento de la LMC debido a su menor toxicidad en comparaci&oacute;n con el busulfan. Su uso se inicio en 1964, sin embargo ha sido remplazada, ya que al igual que el busulfan prolonga la supervivencia pero no impide la progresi&oacute;n de la enfermedad<sup>19-23</sup>.</p>      <p align="justify"><b>Citarabina (4-amino-1-&#91;(2R,3S,4R,5R)-3,4-dihidroxi-5-(hidroximetil)oxolan-2-yl&#93; pirimidina):</b> Fue descubierto en Europa en la d&eacute;cada 1960 y aprobado por la Food and Drug Administration (FDA) en junio de 1969. Tambi&eacute;n llamado arabinofuranosilcitosina, arabinosilcitosina, y Arabin&oacute;sido de citosina o ara-C. Es agente antimetab&oacute;lico an&aacute;logo de la citosina que bloquea la s&iacute;ntesis y reparaci&oacute;n del ADN por inhibici&oacute;n competitiva de ADN polimerasa<sup>24</sup>.</p>      <p align="justify"><b>Trasplante alog&eacute;nico de medula &oacute;sea (TAMO):</b> El primero que se realiz&oacute; con &eacute;xito en un paciente con LMC tuvo lugar en el a&ntilde;o de 1970, y desde entonces ha evolucionado hasta ser el &uacute;nico tratamiento curativo al generar una RMC, alcanzando una supervivencia sin enfermedad de larga duraci&oacute;n<sup>2-7,22</sup>. Para que el TAMO sea efectivo, es necesario que est&eacute; precedido por un tratamiento quimioterap&eacute;utico bastante agresivo que elimine el 100&#37; de las clonas malignas y facilite la colonizaci&oacute;n de las c&eacute;lulas madres sanas. Este protocolo es altamente t&oacute;xico y mortal (10-70&#37;); por lo que el TAMO se recomienda, en menores de 65 a&ntilde;os o como segunda l&iacute;nea terap&eacute;utica tras el fracaso del imatinib<sup>25-27</sup>.</p>      <p align="justify">Debido a las restricciones de edad (relacionadas con las complicaciones), donantes compatibles y el riesgo del procedimiento, s&oacute;lo del 15 al 20&#37; de los pacientes con LMC son candidatos al TAMO y de estos; el 50&#37; logra la RMC luego de 5 a&ntilde;os; la cual, en algunos casos, se perpet&uacute;a, incluso hasta 20 a&ntilde;os m&aacute;s, despu&eacute;s del procedimiento. El 50&#37; restante, generalmente recae por la permanencia de clonas malignas, que luego de algunos a&ntilde;os inician nuevamente el proceso neopl&aacute;sico<sup>28-31</sup>.</p>      <p align="justify"><b>Interfer&oacute;n- alfa (INF-&alpha;):</b> Es una glicoprote&iacute;na de origen biol&oacute;gico que ha demostrado tener propiedades antivirales y antiproliferativa. Se introdujo como tratamiento de la LMC a principios de 1980 y en corto tiempo logro reemplazar la quimioterapia convencional, al demostrar mayor supervivencia de los pacientes (57&#37; vs 42&#37; en 5 a&ntilde;os) y que era posible obtener la RCC en un peque&ntilde;o porcentaje de pacientes sensibles al tratamiento (10-30&#37;) sin inducir aplasia medular como ocurr&iacute;a con la quimioterapia intensiva. Al combinarse con quimioterap&eacute;uticos como la hidroxiurea o la citarabina en dosis bajas, puede llegar a alcanzarse en el 35 a 55&#37; de los casos la RCC<sup>2-4, 41</sup>.</p>      <p align="justify">Poco se sabe sobre su mecanismo de acci&oacute;n en la LMC, pero se dice que aumenta la expresi&oacute;n del Ant&iacute;geno Leucocitario Humano (HLA) en las clonas Ph(+), incrementando la presentaci&oacute;n de ant&iacute;genos a las c&eacute;lulas dendr&iacute;ticas. Este tratamiento s&oacute;lo est&aacute; indicado, en pacientes que se encuentran en fase cr&oacute;nica. El INF-&alpha; logr&oacute; mantenerse como el tratamiento de elecci&oacute;n hasta la aparici&oacute;n de los inhibidores espec&iacute;ficos de la prote&iacute;na Tirosina Kinasa y a&uacute;n se considera un tratamiento v&aacute;lido en el manejo de la LMC<sup>28, 31-40</sup>.</p>      <p align="justify"><b>Imatinib o Mesilato de Imatinib (STI 571, Gleevec):</b> Es un activo con actividad antineopl&aacute;sica no relacionado ni qu&iacute;mica ni farmacol&oacute;gicamente con otros medicamentos antineopl&aacute;sicos<sup>42</sup>. Su aparici&oacute;n (1990) revolucion&oacute; por completo el tratamiento de la LMC llegando a ser aprobado en Europa y Am&eacute;rica en el 2001 como agente terap&eacute;utico de primera l&iacute;nea en esta patolog&iacute;a, despu&eacute;s de su &eacute;xito en numerosos ensayos cl&iacute;nicos. El Imatinib es un derivado de la fenilaminopirimidina (inhibidor de las prote&iacute;nas tirosina kinasa) que compite con el Adenosin Trifosfato (ATP) por unirse al dominio SH1 de la prote&iacute;na BCR-ABL, impidiendo que se lleve a cabo su fosforilaci&oacute;n y por tanto, manteni&eacute;ndola inactiva; de tal forma que inhibe selectivamente la proliferaci&oacute;n de la clona neopl&aacute;sica e induce la apoptosis de las mismas. Otra caracter&iacute;stica de gran importancia del imatinib es su alta especificidad por el dominio catal&iacute;tico homologo del oncogen asociado al retrovirus originalmente aislado del sarcoma de Rous (Src) de la BCR-ABL. Aunque se ha visto, posee la capacidad de inhibir ciertas prote&iacute;nas de se&ntilde;alizaci&oacute;n como el Receptor del Factor de Crecimiento Derivado de Plaquetas (PDGFR) y el c-Kit<sup>42-46</sup>.</p>      ]]></body>
<body><![CDATA[<p align="justify">M&aacute;s del 90&#37; de los pacientes en fase cr&oacute;nica tratados con Imatinib, han logrado RHC y entre el 70 y 80&#37; de los casos tambi&eacute;n RCC. Sin embargo, cuando el tratamiento inicia en fase acelerada o en crisis bl&aacute;stica, la RHC disminuye al 76 y 34&#37; respectivamente; y del mismo modo, del 76 al 91&#37; no alcanzan la RCC<sup>47-48</sup>.</p>      <p align="justify">Actualmente, el Imatinib es el tratamiento de elecci&oacute;n para el tratamiento de la LMC, pues ha demostrado que tanto la respuesta hematol&oacute;gica, citogen&eacute;tica y molecular, es muy superior a la obtenida con el IFN-&alpha; o los quimioterap&eacute;uticos convencionales, y adicionalmente, es muy bien tolerada cl&iacute;nicamente por la mayor&iacute;a de los pacientes, desafortunadamente, cerca del 15-25&#37; de los pacientes generan una resistencia primaria (intr&iacute;nseca) al medicamento y un 20-30&#37; de quienes responden inicialmente, luego de 5 a&ntilde;os de tratamiento, adquieren una resistencia secundaria<sup>49-56</sup>.</p>      <p align="justify"><b>Dasatinib (BMS-354825):</b> Desarrollado por Bristol-Myers Squibb, act&uacute;a como un doble inhibidor de kinasas Src/Abl, es decir, inhibe a la familia de tirosina kinasas Src y adem&aacute;s act&uacute;a como inhibidor selectivo de la kinasa de Abl. Es mucho m&aacute;s potente que el Imatinib (20-200 veces) en relaci&oacute;n a su actividad sobre los mutantes y las formas salvajes del BCR-ABL, con la excepci&oacute;n del mutante T315I. Su uni&oacute;n con la prote&iacute;na BCR-ABL, es m&aacute;s flexible, permiti&eacute;ndole interactuar con diferentes estados conformacionales de BCR-ABL y por tanto, aumenta su afinidad. Aunque, el Dasatinib es el m&aacute;s potente inhibidor del dominio kinasa del ABL que se ha desarrollado hasta la fecha, no es el m&aacute;s espec&iacute;fico, pues su finalidad es ampliar el perfil de reacci&oacute;n con el prop&oacute;sito de incluir a otros miembros de la familia Src<sup>7-68</sup>.</p>      <p align="justify"><b>Nilotinib (AMN107):</b> Derivado del Imatinib desarrollado por Novartis, actualmente en evaluaci&oacute;n. Es un inhibidor selectivo del dominio kinasa del ABL en su estado inactivo. La estructura del Nilotinib le permite unirse m&aacute;s estrechamente a BCR-ABL aumentando su avidez, eficacia, especificidad y sensibilidad por la quimera neopl&aacute;sica. Hasta el momento, la mayor&iacute;a de pacientes resistentes a Imatinib son 25 a 50 veces m&aacute;s sensibles al Nilotinib (excepci&oacute;n la mutaci&oacute;n T315I), lo cual lo hace mucho m&aacute;s potente que el Imatinib. El Nilotinib tambi&eacute;n inhibe al Receptor del Factor de Crecimiento Derivado de las Plaquetas (PDGFR) y el CD117 (receptor del factor de crecimiento de c&eacute;lulas Mast/stem), pero, a diferencia del Dasatinib, no inhibe la familia de kinasas Src. Hasta ahora este tratamiento se asocia con un perfil favorable de seguridad y tolerabilidad<sup>19,66-70</sup>.</p>      <p align="justify">Dos nuevos agentes, bosutinib (SKI-606) y INNO-406 (NS-187), han llegado a la Fase I - II de los ensayos cl&iacute;nicos. Sin embargo, ninguno de los agentes discutido hasta el momento es capaz de la inhibici&oacute;n de la mutante T315I de BCR-ABL.<sup>71, 72</sup></p>      <p align="justify"><b>Otras terapias innovadoras</b></p>      <p align="justify"><b>Hommoharringtonina (HHT):</b> Es una planta alcaloide derivada de un &aacute;rbol chino. Su eficacia como agente anticancer&iacute;geno se ha reconocido y documentado tanto en la LMA como en la LMC. Se piensa que act&uacute;a inhibiendo la s&iacute;ntesis de prote&iacute;nas. Se ha comprobado que su uso conjunto con el interfer&oacute;n alfa (IFN-&alpha;) o el Imatinib, potencia la respuesta al tratamiento, logr&aacute;ndose mejores resultados<sup>19,69-72</sup>.</p>      <p align="justify"><b>Tri&oacute;xido de ars&eacute;nico (As2O3):</b> No est&aacute; claro c&oacute;mo ejerce su acci&oacute;n en la LMC, pero se sugiere que posee capacidad apopt&oacute;tica en las c&eacute;lulas malignas, reduciendo los niveles de BCR-ABL de forma especifica. Adem&aacute;s, se ha descrito una relaci&oacute;n sin&eacute;rgica entre As2O3 y el Imatinib, incrementando la respuesta a estos f&aacute;rmacos<sup>71-73</sup>.</p>      <p align="center"><font size="3"><b>CONCLUSIONES</b></font></p>      <p align="justify">La LMC se caracteriza por ser una enfermedad con comportamiento bif&aacute;sico o trif&aacute;sico, diagnosticada en un 50&#37; de los casos al momento del diagn&oacute;stico y su pron&oacute;stico depende de la etapa en la cual sea identificada, siendo la sobrevida mucho menor en los pacientes diagnosticados durante la fase acelerada o durante la crisis bl&aacute;stica.</p>      ]]></body>
<body><![CDATA[<p align="justify">Aunque el diagn&oacute;stico confirmatorio y pron&oacute;stico es definido con cariotipo y t&eacute;cnicas de biolog&iacute;a molecular, no todos los pacientes tienen acceso a estas pruebas, por ser costosas y no estar incluidas en el Plan Obligatorio de Salud (POS), as&iacute; como tampoco tienen acceso al uso de nuevos f&aacute;rmacos; disminuyendo la sobrevida de nuestros pacientes a menos de la mitad de la informada en pa&iacute;ses tercermundistas (5 a 7 a&ntilde;os). Las principales razones por las cuales estos procedimientos diagn&oacute;sticos y tratamientos no se encuentran cubiertos, puede deberse a la falta de gesti&oacute;n de los profesionales de la salud y el desconocimiento de las autoridades sanitarias sobre el n&uacute;mero de casos y poblaci&oacute;n que afecta (en su mayor&iacute;a en edad productiva) y al desconocimiento de la evoluci&oacute;n de las intervenciones terap&eacute;uticas durante la &uacute;ltima d&eacute;cada.</p>      <p align="justify">En Colombia, aunque el uso del imatinib fue aprobado desde enero de 2003 por el INVIMA como terapia de primera l&iacute;nea de la LMC y posteriormente recibi&oacute; la aprobaci&oacute;n para el uso en poblaci&oacute;n pedi&aacute;trica mayor de 3 a&ntilde;os, no es un medicamento incluido en el POS, a pesar de que su uso es esencial para la vida y la salud del paciente. Esta situaci&oacute;n es dram&aacute;tica si tenemos en cuenta que el beneficio del imatinib y otros inhibidores de las tirosina kinasas depende del cumplimiento disciplinado del tratamiento, sin la obstaculizaci&oacute;n a la que son objeto rutinariamente nuestros pacientes por diversas razones.</p>      <p align="justify">Finalmente, podemos decir que los espectaculares resultados con el imatinib, la existencia de dasatinib y nilotinib, la investigaci&oacute;n activa de otra decena de compuestos potencialmente eficaces contra esta enfermedad, han hecho que el alotrasplante de m&eacute;dula &oacute;sea no se utilice hoy en pacientes con LMC en fase cr&oacute;nica como terapia de primera l&iacute;nea. Se puede decir que el advenimiento de los inhibidores de tirosin kinasas aumento el tiempo de supervivencia a m&aacute;s de cinco a&ntilde;os en cerca de un 90&#37; de los pacientes con LMC, cifra que en nuestro pa&iacute;s con el trabajo de todos podr&iacute;a ser posible.</p>      <p align="center"><font size="3"><b>REFERENCIAS</b></font></p>      <!-- ref --><p align="justify">1. Sessions J. Chronic Myeloid Leukemia in 2007. Journal of Managed Care Pharmacy 2007; Vol. 13: s4-s7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000067&pid=S0121-0807200900020000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify">2. Sawyers C. Chronic Myeloid Leukemia. 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