<?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>2565-005X</journal-id>
<journal-title><![CDATA[Gaceta mexicana de oncología]]></journal-title>
<abbrev-journal-title><![CDATA[Gac. mex. oncol.]]></abbrev-journal-title>
<issn>2565-005X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Oncología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2565-005X2023000400157</article-id>
<article-id pub-id-type="doi">10.24875/j.gamo.23000137</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Respuesta a radioterapia conformal en paragangliomas de cabeza y cuello]]></article-title>
<article-title xml:lang="en"><![CDATA[Response to conformal radiotherapy in head and neck paragangliomas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zárate-Gómez]]></surname>
<given-names><![CDATA[Alejandra P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villavicencio-Queijeiro]]></surname>
<given-names><![CDATA[Michelle A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Núñez-Guardado]]></surname>
<given-names><![CDATA[Gabriela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Marín]]></surname>
<given-names><![CDATA[Gabriel A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado Centro Médico Nacional 20 de Noviembre Servicio de Radioterapia]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2023</year>
</pub-date>
<volume>22</volume>
<numero>4</numero>
<fpage>157</fpage>
<lpage>162</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2565-005X2023000400157&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2565-005X2023000400157&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2565-005X2023000400157&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción: Los paragangliomas de la región de cabeza y cuello (PCyC) representan el 3% de los sitios extraadrenales. Son tumores benignos de alta vascularidad y baja proliferación para los cuales la cirugía es el tratamiento primario, con tasas de control del 78-93%. La radioterapia externa se emplea en tumores no resecables con altas tasas de control.  Objetivo: Reportar la respuesta de los PCyC al tratamiento de radioterapia conformal fraccionada (RCF).  Métodos: Se presenta una serie de casos tratados con intención radical o adyuvante en un periodo de 10 años. Se describen las características de la serie y la tasa de respuesta a cinco años, con análisis de supervivencia.  Resultados: Se incluyeron 41 casos. El tamaño promedio de las lesiones fue de 4.7 cm y la localización más frecuente la región carotídea con 27 casos (65.8%). La finalidad del tratamiento fue radical en 26 casos (63.4%). La respuesta a cinco años fue del 96.4% con una tasa de regresión parcial del 67.8% y de enfermedad estable del 28.6%.  Conclusiones: La RCF es un tratamiento efectivo para el control del curso clínico de los PCyC, en el rango de dosis de 45-50 Gy dentro del cual no se observan complicaciones. El tipo de respuesta es bimodal al estabilizar el crecimiento de la lesión o inducir una lenta regresión parcial a lo largo del tiempo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Head and neck paragangliomas (HNP) represent 3% of extra-adrenal presentation sites. They are benign tumors with high vascularity and low proliferation for which surgery is the primary treatment, with control rates of 78-93%. External radiotherapy is used in unresectable tumors with high control rates.  Objective: To report the response of HNP to fractionated conformal radiotherapy (FCR) treatment.  Methods: A review of cases treated with radical or adjuvant purpose over a 10 years period is presented. The characteristics of the series and the response rate at 5 years are described, with survival analysis.  Results: We included 41 cases. The average size of the lesions was 4.7 cm, and the most frequent location was the carotid region with 27 cases (65.8%). The treatment modality was radical in 26 cases (63.4%). The 5-year response was 96.4% with a partial regression rate of 67.8% and stable disease of 28.6%.  Conclusions: FCR is an effective treatment for control of the clinical course of the HNP, in the dose range of 45-50 Gy within which no complications are observed. The type of response is bimodal, stabilizing the growth of the lesion or inducing a slow partial regression over time.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Paraganglioma]]></kwd>
<kwd lng="es"><![CDATA[Cabeza y cuello]]></kwd>
<kwd lng="es"><![CDATA[Radioterapia conformal]]></kwd>
<kwd lng="en"><![CDATA[Paraganglioma]]></kwd>
<kwd lng="en"><![CDATA[Head and neck]]></kwd>
<kwd lng="en"><![CDATA[Conformal radiotherapy]]></kwd>
</kwd-group>
</article-meta>
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<article-title xml:lang=""><![CDATA[Radiation or surgery for chemodectoma of the temporal bone:A review of local control and complications]]></article-title>
<source><![CDATA[Head Neck]]></source>
<year>1990</year>
<volume>12</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>303-7</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
