Presencia de marcadores de transición epitelio-mesénquima por inmunohistoquímica en osteosarcoma pediátrico y asociación con desenlaces clínicos

dc.contributor.advisorOlaya Morales, Nataliaspa
dc.contributor.advisorLinares Ballesteros, Adrianaspa
dc.contributor.authorFonseca Sepúlveda, Eileen Vivianaspa
dc.contributor.researchgroupGrupo de investigación en Oncohematología Pediátricaspa
dc.contributor.subjectmatterexpertPatiño Calderón, Esteban Felipespa
dc.contributor.subjectmatterexpertAponte Barrios, Nelsonspa
dc.date.accessioned2022-02-10T16:36:00Z
dc.date.available2022-02-10T16:36:00Z
dc.date.issued2021-12
dc.descriptionilustraciones, gráficas, tablasspa
dc.description.abstractIntroducción: La transición epitelio-mesénquima (TEM) es la capacidad celular de cambiar su fenotipo original de forma transitoria y ha sido identificado como un mecanismo tumoral asociado con características clínicas agresivas como presencia de enfermedad distante y diseminada. En sarcomas, estos mecanismos no están bien dilucidados. Este trabajo evalúa la expresión de dos factores de transcripción involucrados en la regulación de la TEM mediante inmunohistoquímica: Snail y Twist-1 en osteosarcoma en pacientes pediátricos y su asociación con variables y desenlaces clínicos. Materiales y métodos: estudio de corte retrospectivo en pacientes entre 0-18 años con osteosarcoma. Se realizó estudio de inmunohistoquímica para Twist-1 y Snail y se recolectaron variables clínicas relacionadas con la enfermedad. Fue realizado el análisis de correlación mediante la prueba de chi cuadrado entre las variables clínicas y la positividad de los marcadores y se evaluó la correlación entre la supervivencia global y cada inmunomarcador mediante log rank test. Resultados: 53 pacientes fueron incluidos. En Snail, el patrón de inmunomarcación más frecuente fue a nivel citoplasmático con 26 casos (49,1%) y esto se correlacionó de forma estadísticamente significativa con la presencia de metástasis múltiples (p=0,02) y metástasis de localización ósea distante del primario (p=0,01). Solo 2 casos fueron positivos para Snail a nivel nuclear. Twist fue positivo a nivel nuclear en 45 casos (84,9%) y 13 casos (28,8%) con marcación intensa; 10 casos tenían marcación nuclear y citoplasmática al mismo tiempo. No se encontraron asociaciones con ningún tipo de marcación de Twist y las variables clínicas analizadas. Conclusiones: Snail y Twist-1, se expresan en diferentes localizaciones, de forma frecuente en osteosarcomas pediátricos. Snail citoplasmático se correlacionó de forma estadística enfermedad metastastica y diseminada. La positividad de ambos marcadores sugiere la activación de estas proteínas como reguladores de eventos de TEM/TME en osteosarcomas pediátricos y se plantea un rol esencial en los fenómenos que se relacionan con la agresividad clínica de la enfermedad. Se requieren estudios adicionales que confirmen o descarten nuestros hallazgos. (Texto tomado de la fuente).spa
dc.description.abstractIntroduction: The epithelial-mesenchymal transition (EMT) is the cellular capacity to change its original phenotype in a transitory way, it has been identified as a tumor mechanism associated with aggressive clinical characteristics such as the presence of distant and disseminated disease. In sarcomas, these mechanisms are not well elucidated. This work evaluates the expression of two transcription factors involved in the regulation of EMT by immunohistochemistry: Snail and Twist-1 in osteosarcoma in pediatric patients and their association with clinical variables and outcomes. Materials and methods: a retrospective study in patients between 0-18 years old with osteosarcoma. An immunohistochemical study was performed for Twist-1 and Snail and clinical variables related to the disease were collected. Correlation analysis was performed using the chi-square test between the clinical variables and the positivity of the markers, and the correlation between overall survival and each immunomarker was evaluated using the log rank test. Results: 53 patients were included. In Snail, the most frequent immunostaining pattern was at the cytoplasmic level with 26 cases (49.1%) and this correlated in a statistically significant way with the presence of multiple metastases (p=0.02) and distant bone metastases from the primary (p=0.01). Only 2 cases were positive for Snail at the nuclear level. Twist-1 was positive at the nuclear level in 45 cases (84.9%) and 13 cases (28.8%) with intense marking; 10 cases had nuclear and cytoplasmic labeling at the same time. No associations were found with any type of Twist marking and the clinical variables analyzed. Conclusions: Snail and Twist-1 are expressed in different locations and are frequently found in pediatric osteosarcomas. Cytoplasmic Snail was statistically correlated with metastatic and disseminated disease. The positivity of both markers suggests the activation of these proteins as regulators of EMT events in pediatric osteosarcomas and an essential role in the phenomena related to the clinical aggressiveness of the disease is considered. Additional studies are required to confirm or rule out our findings.eng
dc.description.degreelevelEspecialidades Médicasspa
dc.description.degreenameEspecialista en Oncohematología Pediátricaspa
dc.description.sponsorshipGrupo de investigación en Oncohematología Pediátricaspa
dc.format.extent31 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.identifier.instnameUniversidad Nacional de Colombiaspa
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombiaspa
dc.identifier.repourlhttps://repositorio.unal.edu.co/spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/80932
dc.language.isospaspa
dc.publisherUniversidad Nacional de Colombiaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotáspa
dc.publisher.departmentDepartamento de Pediatríaspa
dc.publisher.facultyFacultad de Medicinaspa
dc.publisher.placeBogotá, Colombiaspa
dc.publisher.programBogotá - Medicina - Especialidad en Oncohematología Pediátricaspa
dc.relation.indexedBiremespa
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseReconocimiento 4.0 Internacionalspa
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/spa
dc.subject.ddc610 - Medicina y saludspa
dc.subject.decsInmunohistoquímicaspa
dc.subject.decsImmunohistochemistryeng
dc.subject.decsOsteosarcomaeng
dc.subject.decsOsteosarcomaspa
dc.subject.decsTransición Epitelial-Mesenquimalspa
dc.subject.decsEpithelial-Mesenchymal Transitioneng
dc.subject.proposalSnaileng
dc.subject.proposalTwist-1eng
dc.subject.proposalOsteosarcomaspa
dc.subject.proposalTransición mesénquima-epiteliospa
dc.subject.proposalSarcomasspa
dc.titlePresencia de marcadores de transición epitelio-mesénquima por inmunohistoquímica en osteosarcoma pediátrico y asociación con desenlaces clínicosspa
dc.title.translatedPresence of epithelial-mesenchymal transition markers by immunohistochemistry in pediatric osteosarcoma and association with clinical outcomeseng
dc.typeTrabajo de grado - Especialidad Médicaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.redcolhttp://purl.org/redcol/resource_type/TMspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
dcterms.audience.professionaldevelopmentEstudiantesspa
dcterms.audience.professionaldevelopmentInvestigadoresspa
dcterms.audience.professionaldevelopmentMaestrosspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa
oaire.fundernameEste trabajo fue financiado por el grupo de investigación en Oncohematología Pediátrica a través del centro de costos Preceptorship 400032.spa

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