Time filter

Source Type


Camejo D.,CSIC - Center of Edafology and Applied Biology of the Segura | Marti M.C.,CSIC - Center of Edafology and Applied Biology of the Segura | Olmos E.,CSIC - Center of Edafology and Applied Biology of the Segura | Torres W.,INCA | And 2 more authors.
Biologia Plantarum

Alfalfa (Medicago sativa L.) roots were treated with 50 and 100 μg cm -3 of oligogalacturonide (OGA) solutions with a degree of polymerization between 7 and 15. Changes in the activities of superoxide dismutase (SOD), catalase (CAT), peroxidase (POX), ascorbate peroxidase (APX), monodehydroascorbate reductase (MDHAR) and dehydroascorbate reductase (DHAR) as well as ascorbate (ASC) content were determined in crude extract of alfalfa roots after 30, 60 and 120 min of treatment. An increase in the SOD activity was observed in roots treated with 50 and 100 μg cm -3 OGA, which could be related to its O 2 ·- scavenging function. As concern H 2O 2 scavenging, CAT activity was increased in the first 30 min by both OGA concentrations, while POX was a key enzyme at higher OGA concentration and treatment duration. ASC content firstly increased upon exposure to high OGA concentration, and then decreased after longer treatment while low OGA concentration had no effect on ASC content. © 2012 Springer Science+Business Media B.V. Source

da Rosa L.A.R.,Brazilian Radiological Protection and Dosimetry Institute (IRD) | Cardoso S.C.,IRD CNEN | Campos L.T.,Brazilian Radiological Protection and Dosimetry Institute (IRD) | Alves V.G.L.,IRD CNEN | And 2 more authors.
Journal of Applied Clinical Medical Physics

The purpose of this study is to investigate the influence of lung heterogeneity inside a soft tissue phantom on percentage depth dose (PDD). PDD curves were obtained experimentally using LiF:Mg,Ti (TLD-100) thermoluminescent detectors and applying Eclipse treatment planning system algorithms Batho, modified Batho (M-Batho or BMod), equivalent TAR (E-TAR or EQTAR), and anisotropic analytical algorithm (AAA) for a 15 MV photon beam and field sizes of 1 × 1, 2 × 2, 5 ×5, and 10 × 10 cm2. Monte Carlo simulations were performed using the DOSRZnrc user code of EGSnrc. The experimental results agree with Monte Carlo simulations for all irradiation field sizes. Comparisons with Monte Carlo calculations show that the AAA algorithm provides the best simulations of PDD curves for all field sizes investigated. However, even this algorithm cannot accurately predict PDD values in the lung for field sizes of 1 × 1 and 2 × 2 cm2. An overdosage in the lung of about 40% and 20% is calculated by the AAA algorithm close to the interface soft tissue/lung for 1 × 1 and 2 × 2 cm2 field sizes, respectively. It was demonstrated that differences of 100% between Monte Carlo results and the algorithms Batho, modified Batho, and equivalent TAR responses may exist inside the lung region for the 1 × 1 cm2 field. Source

De Albuquerque A.K.A.C.,Instituto Nacional Of Cancer Inca | De Oliveira Romano S.,INCA | Eisenberg A.L.A.,Federal University of Fluminense
Jornal Brasileiro de Patologia e Medicina Laboratorial

Introduction: Hemangioendotheliomas are locally aggressive vascular tumors with intermediate malignity and metastasis risk. The epithelioid variant, the most aggressive one, equally affects men and women at any age and it is rare in children. It occurs as a solitary tumor, which is usually painful, affecting superficial or deep soft tissues. Furthermore, it is less frequent in the liver, lung, bones, skin, lymph nodes and central nervous system. Microscopically, they present epithelioid cells with intracytoplasmic vacuoles, low mitotic activity and little or no necrosis. Additionally, its vascular nature is confirmed by immunohistochemical studies (CD31, CD34 and factor VIII). Objective, material and methods: Through search in the archives of the Pathology Division of the National Cancer Institute (Instituto Nacional de Cancer [INCA]) from 1996 to 2011, 13 cases of epithelioid hemangioendothelioma (HEE) were identified and analyzed. Results and discussion: seven cases occurred in male patients and six in female patients, mean age 42 years, ranging from 7-66. The most common locations were: soft tissue (three patients; 23%); head and neck, mediastinum, bone and lung (two patients each; 15%); liver and lymph nodes (one patient each; 8%). There was clinical follow-up of nine patients: five were alive and disease-free (one to six years after diagnosis); three out of four patients with aggressive disease progressed to death (one month to five years after diagnosis); one relapsed two years after diagnosis and is alive with disease. Conclusion: This series of 13 cases of HEE, whose diagnoses were based on morphological and/or immunohistochemical analyses, demonstrates the different patterns of clinical presentation and biologic behavior of this disease. Source

Goldberg S.,INCA | Goldberg S.,Institute of Veille Sanitaire | Rey G.,French Institute of Health and Medical Research | Luce D.,University of Versailles | And 5 more authors.
Occupational and Environmental Medicine

Background: In population-based mesothelioma studies in industrialised countries, the incidence of mesothelioma without any identified asbestos exposure (IAE) is usually higher among women, while male incidence is mainly attributed to IAE. Through a comparison of the spatial distribution of male and female rates, and IAE and no IAE incidence, this study investigated whether mesotheliomas without IAE are in fact induced by nonrecognised asbestos exposure, mostly from environmental sources. Methods: We calculated mesothelioma mortality (SMR) and incidence (SIR) ratios by district in France, pooling 30 and 10 years of data, respectively. Using correlation coefficients, we compared geographical patterns of male and female mesothelioma ratios, and IAE and no IAE mesothelioma ratios. Results: The raw numbers of male and female mesothelioma cases were equivalent. Mesothelioma SMR (0.76) and SIR (0.80) geographical correlations between men and women were strongly positive. SIR correlation between occupationally IAE and no IAE cases was also positive (0.69). Correlation between occupationally IAE and no IAE cases was positive among women but not among men. Conclusions: Data analyses of mesothelioma mortality and incidence showed that female cases occur in the same geographical areas as male cases. Female mesotheliomas with no IAE occur in the same geographical areas as exposed cases, suggesting asbestos has a major influence on female mesothelioma, likely through environmental exposure. Source

Antunes H.S.,Instituto Nacional Of Cancer Inca | Herchenhorn D.,INCA | Small I.A.,Instituto Nacional Of Cancer Inca | Araujo C.M.M.,INCA | And 7 more authors.
Radiotherapy and Oncology

Background Oral mucositis (OM) is a complication of chemoradiotherapy treatment of head and neck squamous cell carcinoma (HNSCC) patients with no effective therapy. This study was designed to assess the efficacy of preventive low-level laser therapy (LLLT) in reducing the incidence of grade 3-4 OM. Material and methods From June 2007 to December 2010, 94 HNSCC patients entered a prospective, randomized, double-blind, placebo-controlled phase III trial. Chemoradiotherapy consisted of conventional radiotherapy plus concurrent cisplatin every 3 weeks. A diode InGaAlP (660 nm-100 mW-1 J-4 J/cm2) was used. OM evaluation was performed by WHO and OMAS scales and quality of life by EORTC questionnaires (QLQ). Results A six-fold decrease in the incidence of grades 3-4 OM was detected in the LLLT group compared to the placebo; (6.4% versus 40.5%). LLLT impacted the incidence of grades 3-4 OM to a relative risk ratio of 0.158 (CI 95% 0.050-0.498). After treatment QLQ-C30 showed, differences favoring LLLT in physical, emotional functioning, fatigue, and pain; while the QLQ-H&N35 showed improvements in LLLT arm for pain, swallowing, and trouble with social eating. Conclusion Preventive LLLT in HNSCC patients receiving chemoradiotherapy is an effective tool for reducing the incidence of grade 3-4 OM. Efficacy data were corroborated by improvements seen in quality of life. © 2013 Elsevier Ireland Ltd. All rights reserved. Source

Discover hidden collaborations