<?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>0121-8123</journal-id>
<journal-title><![CDATA[Revista Colombiana de Reumatología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Colomb.Reumatol.]]></abbrev-journal-title>
<issn>0121-8123</issn>
<publisher>
<publisher-name><![CDATA[Asociación Colombiana de Reumatología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-81232022000200107</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Frequency of anti-neutrophil cytoplasmic antibodies in patients with systemic lupus erythematosus]]></article-title>
<article-title xml:lang="es"><![CDATA[Frecuencia de los anticuerpos anticitoplasma de neutrófilo en pacientes con lupus eritematoso sistémico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santacruz-Sandoval]]></surname>
<given-names><![CDATA[Evelyn]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aragón]]></surname>
<given-names><![CDATA[Cristian C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nieto-Aristizábal]]></surname>
<given-names><![CDATA[Ivana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Ordoñez]]></surname>
<given-names><![CDATA[Ingrid]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quijano]]></surname>
<given-names><![CDATA[Jhoan S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Castillo]]></surname>
<given-names><![CDATA[Daniela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mondragón M]]></surname>
<given-names><![CDATA[Karen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Posso-Osorio]]></surname>
<given-names><![CDATA[Iván]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrera]]></surname>
<given-names><![CDATA[María Claudia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rios-Serna]]></surname>
<given-names><![CDATA[Lady J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<given-names><![CDATA[Gabriel J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Icesi Department of Internai Medicine Medical School]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Icesi Department ofInternal Medicine and Rheumatology Medical School, Centro CIRAT]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Fundación Valle del Lili Clinical Research Center ]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad del Valle Department ofInternal Medicine Medical School]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Fundación Valle del Lili Unit of Rheumatology ]]></institution>
<addr-line><![CDATA[Cali ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>107</fpage>
<lpage>112</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-81232022000200107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-81232022000200107&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-81232022000200107&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction:  Systemic lupus erythematosus (SLE) is a multisystem autoimmune disease. Patients with SLE exhibit multiple serum autoantibodies, including anti-neutrophil cytoplasmic antibodies (ANCAs). There are two main techniques to detect ANCAs: indirect immunofluorescence (IIF) and enzyme-linked immunosorbent assay (ELISA). In this study, an attempt was made to determine the frequency and clinical associations of ANCAs in patients with SLE.  Methods:  A cross-sectional study was conducted in a tertiary care hospital in Colombia that included 74 patients with SLE. The presence of ANCAs was assessed using IIF with ethanol-fixed slides, and ELISA was used to detect antibody specificities for myeloperoxidase (MPO)-ANCA and proteinase 3 (PR3)-ANCA.  Results:  Of the 74 patients with SLE evaluated, 60 (81.1%) of them were ANCA-positive by IIF. By contrast, only one patient showed specificity for PR3-ANCA by ELISA. The relevance of ANCA positivity by IIF and clinical and serological features was significant for renal involvement (p = .0174), and Systemic Lupus Erythematosus Disease Activity Index (SLEDAI) (p = .0308).  Conclusion:  ANCAs are common in the serum of patients with SLE, as detected by ethanol-fixed slides with IIF staining. However, detection of specificity to PR3 and/or MPO is rare, thus highlighting the importance of detecting these autoantibodies by different techniques.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción:  El lupus eritematoso sistémico (LES) es una enfermedad autoinmune sistémica. Los pacientes con LES muestran múltiples autoanticuerpos séricos, incluyendo los anticuerpos anticitoplasma de neutrófilo (ANCA, por sus siglas en inglés). Existen 2 técnicas principales para la detección de ANCA: inmunofluorescencia indirecta (IFI) y ensayo por inmunoadsorción ligado a enzimas (ELISA). En este estudio nuestro objetivo fue determinar la frecuencia y las asociaciones clínicas de los ANCA en pacientes con LES.  Métodos:  Realizamos un estudio transversal de 74 pacientes con LES en un hospital de alta complejidad de Colombia. La presencia de ANCA se evaluó por IFI, utilizando láminas con fijación de etanol, y con ELISA para determinar las especificidades para mieloperoxidasa (MPO)-ANCA y proteinasa 3 (PR3)-ANCA.  Resultados:  Fueron evaluados 74 pacientes con LES, 60 (81,1%) de ellos fueron positivos para ANCA. Por el contrario, solo un paciente mostró especificidad para PR3-ANCA por ELISA. La relación entre la positividad para ANCA por IFI y las características clínicas y serológicas fue estadísticamente significativa para compromiso renal (p = 0,0174) y para el índice de actividad de la enfermedad (Systemic Lupus Erythematosus Disease Activity Index [SLEDAI]) (p = 0,0308).  Conclusiones:  Los ANCA detectados mediante fijación con etanol por técnicas de IFI, son comunes en pacientes con LES. Sin embargo, la detección de especificidades para PR3 o MPO es rara; se destaca la importancia de la evaluación de estos autoanticuerpos mediante diferentes técnicas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Antibodies]]></kwd>
<kwd lng="en"><![CDATA[antineutrophil cytoplasmic]]></kwd>
<kwd lng="en"><![CDATA[Lupus erythematosus]]></kwd>
<kwd lng="en"><![CDATA[systemic Immunofluorescence technique]]></kwd>
<kwd lng="en"><![CDATA[indirect]]></kwd>
<kwd lng="en"><![CDATA[Enzyme-linked immunosorbent assay]]></kwd>
<kwd lng="es"><![CDATA[Anticuerpos anticitoplasma de neutrófilos]]></kwd>
<kwd lng="es"><![CDATA[Lupus eritematoso sistémico]]></kwd>
<kwd lng="es"><![CDATA[Técnica del anticuerpo fluorescente indirecta]]></kwd>
<kwd lng="es"><![CDATA[Ensayo de inmunoadsorción enzimática]]></kwd>
</kwd-group>
</article-meta>
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