ABSTRACT
INTRODUCCIÓN: Polimorfismos en enzimas de biotransformación hansido asociados como factores de riesgo de cáncer prostático (CaP), aunque su papel como marcadores de pronóstico no está totalmente validado. El objetivo de este trabajofue estudiar en un grupo de pacientes sometidos a tamizaje, la utilidad del polimorfismo de CYP1A1 en el diagnóstico y sobrevida de pacientes chilenos con CaP.MATERIALES Y MÉTODOS: 255 controles y 234 casos con CaP fueron incluidos en programa de tamizaje en CONAC entre1995 y 2004. De muestras de sangre periférica se obtuvo DNA genómico y determinó polimorfi smo de CYP1A1*2A. Paraanálisis de susceptibilidad se usaron modelos de regresión logística uni y multivariado. Los pacientes con CaP fueron seguidos por 8,76 años en promedio, determinando sobrevida global y cáncer específica a través de curvas de Kapplan-Meier y test de Log-rank. Se obtuvieron riesgos (Hazard Ratio) ajustados con modelo proporcional de Cox, con IC del 95%...
INTRODUCTION: Polymorphisms in biotransformation enzymes have been associated as risk factors for prostate cancer(CaP), although their role as prognostic markers is not fully validated. The aim of this work was to study in a group ofpatients undergoing screening, utility CYP1A1 polymorphism in the diagnosis and survival of Chilean patients with PCa.MATERIALS AND METHODS: 255 cases and 234 controls with CaP that were included in CONAC screening program between1995 and 2004. Genomic DNA was obtained from samples of peripheral blood and polymorphism of CYP1A1 * 2ª determined.For sensitivity analysis uni and multivariate logistic regression models were used. PCa patients were followed for8.76 years on average, determining overall and cancerspecifi c survival through Kapplan- Meier curves and log-rank test.Risks (Hazard Ratio) adjusted Cox proportional model, with 95% was obtained...
Subject(s)
Humans , Male , Middle Aged , Prostatic Neoplasms/diagnosis , Prostatic Neoplasms/epidemiology , /genetics , Case-Control Studies , Prostatic Neoplasms/geneticsABSTRACT
In order to obtain a wider perspective of iron homeostasis in the eye, a comparative study was undertaken of several iron-related parameters (Total Iron, TI; Total Iron Binding Capacity, TIBC; Transferrin, Tf; and saturation of Tf) both in blood serum and in ocular tissues (lens, cornea, iris-ciliary body, retina) and fluids (vitreous body, aqueous humor) of several animal species (pig, cow and rat). The relative degree of oxidative stress of tissues and fluids was evaluated based on the criteria that high values of TI and Tf saturation, and low values of TIBC and Tf, would promote iron-related oxidative stress. The inclusion of both diurnal (pig, cow) and nocturnal (rat) animal species in this comparative work provided the opportunity to explore if iron homeostasis parameters are in some way influenced by the higher oxidative stress level expected in animals with diurnal living habits. This project involved also the design of new and very sensitive methods of analyses, given the fact that in many cases very small amounts of sample (i.e., aqueous humor), and/or low concentration of analytes (i.e., transferrin) are available. All results were expressed as concentration relative to mg protein as determined with the Bradford method (microplate assay). When analyzing TI/TIBC it was possible to define a loosely bound iron pool (LBIP) in ocular tissues that was proportional to the degree of vascularization of the tissues analyzed. The comparison of iron related parameters patterns within the eye and among species allowed us to reach the following conclusions: (1) The aqueous humor and vitreous body of cow and pig exhibited highest concentration of Tf and a very low saturation of Tf, while the lowest value of Tf was detected in all species in the lens; (2) TI showed the tendency to be highest in the vitreous body of cow and pig, and lowest in the lens of all three species. The very low iron concentration in the lens may effectively counteract the...