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      Expresión de citoqueratinas en el cáncer de mama y subtipos tumorales por inmunohistoquímica

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          Abstract

          Objetivo: Caracterizar el cáncer de mama en subtipos moleculares mediante la expresión inmunohistoquímica de las Ck5/6, Ck7, Ck8 y Ck18 asociados a los clásicos marcadores determinados y analizar la evolución clínica de los distintos subtipos. Métodos: La muestra fue intencional y de acuerdo con los criterios de inclusión definidos se seleccionaron 149 bloques de parafina de casos con carcinoma ductal infiltrante de la mama. De los resultados previos de marcadores moleculares por inmunohistoquímica que incluyeron RE, RP, Her-2, p53, Bcl2 y Ki-67, se analizó el inmunomarcaje de los tres primeros y se estableció el subtipo tumoral. De los bloques de parafina se construyeron 5 micromatrices de tejido y se evaluó la expresión inmunohistoquímica de las Ck5/6, Ck7, Ck8, Ck18 de acuerdo al subtipo tumoral. Resultados: El promedio de edad de las pacientes fue 51,32 años. Los tumores luminal A y B expresaron Ck8 y Ck18 en más del 80 % de los casos. Los tumores Her-2+ expresaron en más del 80 % de los casos Ck7 y Ck18, la proteína Bcl2 y la p53 marcaron en menos del 25 % y 39 % de los mismos. Los tumores TN expresaron Ck5/6, Ck7, Ck8 y Ck18 de forma variables. La proteína p53 y Bcl2 inmunomarcaron en porcentaje variable de casos y la Ki-67 en casi la totalidad. Presentaron recurrencia la mayoría con tumores Her-2+ y TN, la supervivencia global fue menor en los casos con esos subtipos. Conclusión: El análisis de los biomarcadores moleculares en este estudio proporciona una mejor definición de cada tumor.

          Translated abstract

          Objective: To characterize breast cancer molecular subtypes by immunohistochemical expression of Ck5 / 6, Ck7, and Ck18 Ck8 markers associated with certain classical and analyze the clinical evolution of different subtypes. Methods: Sample was intentional and according to defined criteria including paraffin blocks 149 cases with infiltrating ductal carcinoma of the breast was selected. Previous results of molecular markers by immunohistochemistry that included ER, PR, Her-2, p53, Bcl-2 and Ki-67 immunostaining of the first three was analyzed and tumor subtype was established. Paraffin blocks 5 tissue microarrays were constructed and immunohistochemical expression of Ck5/6, Ck7, Ck8, Ck18 according to tumor subtype was evaluated. Results: The mean age of patients was 51.32 years. The A and B luminal tumors expressed CK18 Ck8 and over 80 % of cases. The Her-2 + tumors expressed in over 80 % of Ck7 and Ck18 cases, the Bcl2 protein and p53 marked in less than 25 % and 39 % thereof. TN tumors expressed Ck5/6, Ck7, and Ck18 Ck8 variable form. p53 and Bcl2 protein immunostained in variable percentage of cases and Ki-67 in almost all. They showed most tumor recurrence Her-2 + and TN, overall survival was lower in patients with these subtypes. Conclusion: The analysis of molecular biomarkers in this study provides a better definition of each tumor.

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            Molecular subtype analysis determines the association of advanced breast cancer in Egypt with favorable biology

            Background Prognostic markers and molecular breast cancer subtypes reflect underlying biological tumor behavior and are important for patient management. Compared to Western countries, women in North Africa are less likely to be prognosticated and treated based on well-characterized markers such as the estrogen receptor (ER), progesterone receptor (PR) and Her2. We conducted this study to determine the prevalence of breast cancer molecular subtypes in the North African country of Egypt as a measure of underlying biological characteristics driving tumor manifestations. Methods To determine molecular subtypes we characterized over 200 tumor specimens obtained from Egypt by performing ER, PR, Her2, CK5/6, EGFR and Ki67 immunohistochemistry. Results Our study demonstrated that the Luminal A subtype, associated with favorable prognosis, was found in nearly 45% of cases examined. However, the basal-like subtype, associated with poor prognosis, was found in 11% of cases. These findings are in sharp contrast to other parts of Africa in which the basal-like subtype is over-represented. Conclusions Egyptians appear to have favorable underlying biology, albeit having advanced disease at diagnosis. These data suggest that Egyptians would largely profit from early detection of their disease. Intervention at the public health level, including education on the benefits of early detection is necessary and would likely have tremendous impact on breast cancer outcome in Egypt.
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              Anuario de Mortalidad 2006

              (2024)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                og
                Revista de Obstetricia y Ginecología de Venezuela
                Rev Obstet Ginecol Venez
                Sociedad de Obstetricia y Ginecología de Venezuela
                0048-7732
                June 2016
                : 76
                : 2
                : 93-101
                Affiliations
                [1 ] Universidad de Carabobo
                [2 ] Universidad de Carabobo
                [3 ] Universidad de Carabobo
                Article
                S0048-77322016000200004
                f0f5238f-4ab3-4d10-999a-e8cb2c08659f

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Venezuela

                Self URI (journal page): http://www.scielo.org.ve/scielo.php?script=sci_serial&pid=0048-7732&lng=en
                Categories
                OBSTETRICS & GYNECOLOGY

                Obstetrics & Gynecology
                Carcinoma de mama,Citoqueratinas,Subtipo molecular,Breast carcinoma,Cytokeratin,Molecular subtype

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