Search results for "estrògens"
showing 4 items of 4 documents
A Pathology-Based Combined Model to Identify PAM50 Non-luminal Intrinsic Disease in Hormone Receptor-Positive HER2-Negative Breast Cancer
2019
No luminal; Subtipus intrínsec; Càncer de mama No luminal; Subtipo intrínseco; Cáncer de mama Non-luminal; Intrinsic subtype, Breast cancer Background: In hormone receptor-positive (HR+)/HER2-negative breast cancer, the HER2-enriched and Basal-like intrinsic subtypes are associated with poor outcome, low response to anti-estrogen therapy and high response to chemotherapy. To date, no validated biomarker exists to identify both molecular entities other than gene expression. Methods: PAM50 subtyping and immunohistochemical data were obtained from 8 independent studies of 1,416 HR+/HER2-negative early breast tumors. A non-luminal disease score (NOLUS) from 0 to 100, based on percentage of estr…
Risk prediction for estrogen receptor-specific breast cancers in two large prospective cohorts
2018
Source at https://doi.org/10.1186/s13058-018-1073-0. Licensed CC BY-NC-ND 4.0. Background: Few published breast cancer (BC) risk prediction models consider the heterogeneity of predictor variables between estrogen-receptor positive (ER+) and negative (ER-) tumors. Using data from two large cohorts, we examined whether modeling this heterogeneity could improve prediction. Methods: We built two models, for ER+ (ModelER+) and ER- tumors (ModelER-) , respectively, in 281,330 women (51% postmenopausal at recruitment) from the European Prospective Investigation into Cancer and Nutrition cohort. Discrimination (C-statistic) and calibration (the agreement between predicted and observed tumor risks)…
Efecto de las ciclooxigenasas en la biodisponibilidad del óxido nítrico en la respuesta vascular al tromboxano A2 en un modelo murino de envejecimien…
2018
El envejecimiento y la pérdida de los estrógenos durante la menopausia se asocian a una menor biodisponibilidad del NO, un aumento de los niveles de O2- vascular y un incremento de sustancias contráctiles, entre ellas el TXA2. Queda por determinar si los efectos deletéreos vasculares inducidos por el TXA2 durante el envejecimiento median una disminución en la biodisponibilidad de NO y un aumento en la producción de O2- y si están modulados por estrógenos. Para ello, se validó un modelo de envejecimiento vascular en ratonas con senescencia acelerada (SAM), con ratonas de la cepa SAMP8 con predisposición a la senescencia acelerada y ratonas SAMR1, con resistencia al desarrollo de senescencia …
In utero exposure to mixtures of xenoestrogens and child neuropsychological development.
2014
BACKGROUND: To date, no epidemiological studies have explored the impact and persistence of in utero exposure to mixtures of xenoestrogens on the developing brain. We aimed to assess whether the cumulative effect of xenoestrogens in the placenta is associated with altered infant neuropsychological functioning at two and at four years of age, and if associations differ among boys and girls. METHODS: Cumulative prenatal exposure to xenoestrogens was quantified in the placenta using the biomarker Total Effective Xenoestrogen Burden (TEXB-alpha) in 489 participants from the INMA (Childhood and the Environment) Project. TEXB-alpha was split in tertiles to test its association with the mental and…