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1.
Colomb. med ; 50(3): 163-175, July-Sept. 2019. tab, graf
Article in English | LILACS | ID: biblio-1098193

ABSTRACT

Abstract Introduction: Breast cancer is the most common neoplasia of women from all over the world especially women from Colombia. 5%­10% of all cases are caused by hereditary factors, 25% of those cases have mutations in the BRCA1/BRCA2 genes. Objective: The purpose of this study was to identify the mutations associated with the risk of familial breast and/or ovarian cancer in a population of Colombian pacific. Methods: 58 high-risk breast and/or ovarian cancer families and 20 controls were screened for germline mutations in BRCA1 and BRCA2, by Single Strand Conformation Polymorphism (SSCP) and sequencing. Results: Four families (6.9%) were found to carry BRCA1 mutations and eight families (13.8%) had mutations in BRCA2. In BRCA1, we found three Variants of Uncertain Significance (VUS), of which we concluded, using in silico tools, that c.81­12C>G and c.3119G>A (p.Ser1040Asn) are probably deleterious, and c.3083G>A (p.Arg1028His) is probably neutral. In BRCA2, we found three variants of uncertain significance: two were previously described and one novel mutation. Using in silico analysis, we concluded that c.865A>G (p.Asn289Asp) and c.6427T>C (p.Ser2143Pro) are probably deleterious and c.125A>G (p.Tyr42Cys) is probably neutral. Only one of them has previously been reported in Colombia. We also identified 13 polymorphisms (4 in BRCA1 and 9 in BRCA2), two of them are associated with a moderate increase in breast cancer risk (BRCA2 c.1114A>C and c.8755­66T>C). Conclusion: According to our results, the Colombian pacific population presents diverse mutational spectrum for BRCA genes that differs from the findings in other regions in the country.


Resumen Introducción: El cáncer de mama es la neoplasia más común en mujeres de todo el mundo, y, también de Colombia. 5% a 10% de todos los casos son causados por factores hereditarios; 25% de estos casos tienen mutaciones en los genes BRCA1/BRCA2. Objetivo: El propósito de este estudio fue el de identificar mutaciones asociadas con riesgo de cáncer de mama y/u ovario familiar en pacientes del pacífico colombiano. Métodos: Fueron revisados para mutaciones en BRCA1 y BRCA2 de línea germinal mediante SSCP y secuenciación 58 familias de alto riesgo para cáncer de mama y/u ovario y 20 controles Resultados: cuatro familias (6.9%) presentaron mutaciones en BRCA1 y ocho familias (13.8%) en BRCA2. En BRCA1, encontramos tres variantes de significado clínico desconocido (VUS), de las cuales concluimos, usando herramientas bioinformáticas, que c.81­12C>G y c.3119G>A (p.Ser1040Asn) son probablemente deletéreas, y c.3083G>A (p.Arg1028His) es probablemente neutral. En BRCA2, encontramos tres VUS: una mutación nueva y dos previamente descritas, usando análisis bioinformáticos, concluimos que c.865A>G (p.Asn289Asp) y c.6427T>C (p.Ser2143Pro) son probablemente deletéreas y c.125A>G (p.Tyr42Cys) es probablemente neutral. Solo una de ellas ha sido reportada previamente en Colombia. También identificamos 13 polimorfismos (4 en BRCA1 y 9 en BRCA2), dos de ellos asociados con un moderado incremento del riesgo para cáncer de mama (BRCA2 c.1114A>C and c.8755­66T>C). Conclusión: de acuerdo con nuestros resultados, la población del suroccidente colombiano presenta un espectro mutacional diverso para los genes BRCA que difiere de lo encontrado en otras regiones del país.


Subject(s)
Adult , Aged , Female , Humans , Middle Aged , Ovarian Neoplasms/genetics , Breast Neoplasms/genetics , BRCA1 Protein/genetics , BRCA2 Protein/genetics , Computer Simulation , Case-Control Studies , Colombia , Germ-Line Mutation , Polymorphism, Single-Stranded Conformational , Genetic Predisposition to Disease
2.
Rev. colomb. obstet. ginecol ; 67(1): 36-49, ene.-mar.2016. ilus, tab
Article in Spanish | LILACS | ID: lil-785395

ABSTRACT

Aportar al ginecólogo herramientas para la identificación de pacientes con riesgo de síndrome de cáncer hereditario de mama y ovario (SCHMO), y brindar consejería en el manejo preventivo de pacientes con este síndrome.Materiales y métodos: a partir de un caso hipotético se formulan preguntas relacionadas con el riesgo de desarrollar cáncer de mama y ovario en pacientes con SCHMO. Para responder estas preguntas se realizó una revisión de la literatura pertinente en las bases de datos Medline vía PubMed, ScienceDirect y SciELO. Se utilizaron los términos MESH "Síndrome de cáncer de mama y ovario hereditario", "Neoplasias ováricas", "Neoplasias de la mama", "Genes BRCA1", "Genes BRCA2" y su equivalente en inglés. Los resultados se restringieron a artículos publicados entre el 2005 y 2015.Resultados: a través de la búsqueda en PubMed se obtuvieron 56 artículos, de los cuales se seleccionaron 45. En ScienceDirect y SciELO se encontraron 7 artículos. Además, se incluyeron 4 artículos de fuentes no ligadas a estas bases de datos.Conclusiones: el ginecoobstetra debe identificar pacientes con riesgo de presentar el síndrome de cáncer hereditario de mama y ovario, y explicar a los pacientes la importancia de la realización de las pruebas moleculares de los genes BRCA1 y BRCA2 y de participar en equipos multidisciplinarios que además deben incluir al genetista, cirujano, los oncólogos y al paciente para la toma de decisiones médicas de acuerdo con los resultados moleculares...


To provide gynaecologists with tools for the identification of patients at risk of hereditary breast and ovarian cancer syndrome (HBOC) and present advise regarding the preventive management of patients with this syndrome.Materials and methods: Questions were asked in relation to the risk of patients with HBOC developing breast and ovarian cancer. To answer those questions, a review of the relevant literature was conducted in the Medline database via PubMed, and in ScienceDirect and SciELO. The MESH terms used were Breast and Ovarian Cancer Syndrome, Ovarian Neoplasms, Breast Neoplasms, BRCA1 Genes, BRCA2 Genes, and their equivalent in English. Results were limited to articles published between 2005 and 2015.Results: Overall, 56 articles were found in PubMed, of which 45 were selected. The search in ScienceDirect and SciELO resulted in 7 articles. Additionally, 4 articles from other sources not linked to these data bases were also included.Conclusions: Obstetric gynaecologists must identify patients at risk of presenting Hereditary Breast and Ovarian Cancer Syndrome, and explain to the patients the importance of performing molecular testing for BRCA1 and BRCA2 genes; and they must participate in multi-disciplinary teams consisting also of geneticists, surgeons, oncologists and patients for medical decision-making in accordance with the molecular results...


Subject(s)
Adult , Female , Breast Neoplasms , Genes, BRCA1 , Hereditary Breast and Ovarian Cancer Syndrome , Ovarian Neoplasms
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