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Lorente D, Castro E, Lozano R, Puente J, Romero-Laorden N, Morales-Barrera R, Rodriguez Vida A, Sáez MI, Mendez-Vidal MJ, Fernandez E, Almagro E, Hernandez A, Hernando Polo S, Pérez-Valderrama B, López-Campos F, Llacer Perez C, Montesa A, Lainez N, Piulats JM, Olmos D. Correlation between time to PSA progression (TTPP), radiographic progression-free survival (rPFS) and overall survival (OS) in first-line abiraterone/enzalutamide (Abi/Enza) and docetaxel (Doc) treated patients in a prospective cohort study. J Clin Oncol 2019. [DOI: 10.1200/jco.2019.37.7_suppl.267] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
267 Background: Abiraterone, enzalutamide and docetaxel represent first-line (1L) treatment options in mCRPC. A significant correlation between rPFS and OS has been reported for patients treated with 1L abi and enza in mCRPC. It is however unclear whether TTPP or rPFS present a similar magnitude of correlation with OS in Doc-treated pts. Methods: We evaluated the association of TTPP and rPFS with OS in pts treated with 1L Abi/Enza or Doc in a prospective multicenter observational cohort study. TTPP and rPFS were defined as per PCWG2. Correlation between TTPP and rPFS with OS was evaluated with Spearman rho coefficients (r), and by calculating the concordance index (c-index) in Cox-regression models. Results: 406 out of 419 pts received 1L Abi/Enza or Doc. After a median follow-up of 40 months (m), 253 mCRPC-related deaths were observed, with a median OS of 31.3 m (95% CI: 27.6-35). Median rPFS and TTPP were 10.8 m (95% CI:9.7-11.9) and 7.2 m (95% CI:6.7-7.7), respectively. Significant correlations between rPFS/TTPP and OS were observed in all pts treated at 1L, as well as in Abi/Enza and Doc treated pts (Table). R and c-index were consistently higher in Abi/Enza treated pts than in Doc treated pts, with a higher difference in predictive accuracy of the Cox regression model observed when comparing the association between TTPP and OS (c-index 0.788 in Abi/Enza treated pts vs 0.627 in Doc treated pts). Conclusions: Differences in r and c-index were observed when evaluating the association between TTPP/rPFS and OS in Abi/Enza and Doc treated pts, suggesting rPFS and TTPP may better predict OS in Abi/Enza than in Doc-treated pts. Indirect comparisons of TTPP in Abi/Enza vs Doc pts may therefore not reflect their true impact on OS. Further insight on the exact significance of TTPP is needed. Clinical trial information: NCT03075735. [Table: see text]
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Alegre-Cortés J, Soto-Sánchez C, Fernandez E. Multiscale dynamics of interstimulus interval integration in visual cortex. PLoS One 2018; 13:e0208822. [PMID: 30557375 PMCID: PMC6296521 DOI: 10.1371/journal.pone.0208822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 11/24/2018] [Indexed: 11/18/2022] Open
Abstract
Although the visual cortex receives information at multiple temporal patterns, much of the research in the field has focused only on intervals shorter than 1 second. Consequently, there is almost no information on what happens at longer temporal intervals. We have tried to address this question recording neuronal populations of the primary visual cortex during visual stimulation with repetitive grating stimuli and intervals ranging from 1 to 7 seconds. Our results showed that firing rate and response stability were dependent of interval duration. In addition, there were collective oscillations with different properties in response to changes in intervals duration. These results suggest that visual cortex could encode visual information at several time scales using oscillations at multiple frequencies.
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Filloux D, Fernandez E, Comstock JC, Mollov D, Roumagnac P, Rott P. Viral Metagenomic-Based Screening of Sugarcane from Florida Reveals Occurrence of Six Sugarcane-Infecting Viruses and High Prevalence of Sugarcane yellow leaf virus. PLANT DISEASE 2018; 102:2317-2323. [PMID: 30207899 DOI: 10.1094/pdis-04-18-0581-re] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A viral metagenomics study of the sugarcane virome in Florida was carried out in 2013 to 2014 to analyze occurrence of known and potentially new viruses. In total, 214 sugarcane leaf samples were collected from different commercial sugarcane (Saccharum interspecific hybrids) fields in Florida and from other Saccharum and related species taken from two local germplasm collections. Virion-associated nucleic acids (VANA) metagenomics was used for detection and identification of viruses present within the collected leaf samples. VANA sequence reads were obtained for 204 leaf samples and all four previously reported sugarcane viruses occurring in Florida were detected: Sugarcane yellow leaf virus (SCYLV, 150 infected samples out of 204), Sugarcane mosaic virus (1 of 204), Sugarcane mild mosaic virus (13 of 204), and Sugarcane bacilliform virus (54 of 204). High prevalence of SCYLV in Florida commercial fields and germplasm collections was confirmed by reverse-transcription polymerase chain reaction. Sequence analyses revealed the presence of SCYLV isolates belonging to two different phylogenetic clades (I and II), including a new genotype of this virus. This viral metagenomics approach also resulted in the detection of a new sugarcane-infecting mastrevirus (recently described and named Sugarcane striate virus), and two potential new viruses in the genera Chrysovirus and Umbravirus.
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Ahamad A, Salenius S, Ross R, Selvaraj R, Fernandez E. Chemoradiation or Altered Fractionation for T2N0M0 Glottic Cancer. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Fulton E, Wild D, Hancock J, Fernandez E, Linnane J. Transition from service to civvy street: the needs of armed forces veterans and their families in the UK. Perspect Public Health 2018; 139:49-58. [PMID: 29975177 DOI: 10.1177/1757913918785650] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
AIMS: Although many veterans make the transition from military to civilian life without difficulty, a small proportion struggle due to an impact on mental and physical wellbeing. Stigma and a reluctance to seek help further exacerbate this problem. The Armed Forces Covenant outlines the importance of ensuring that public services are aware of the specific needs of veterans; however, evidence suggests that knowledge among professional staff may be limited. METHODS: This exploratory study included three phases. Phase 1 (questionnaires) explored the needs of veterans and their families in Warwickshire (UK) regarding information about their health and wellbeing and the barriers and facilitators to accessing local public health services. Also in Phase 1, health and public services staff knowledge of veterans' needs and the Covenant is explored. In Phase 2, both samples attended a related focus group for a more in-depth exploration of the issues identified in Phase 1; in order to inform a Phase 3 workshop to co-develop an intervention. RESULTS: Veterans, their families and friends, wanted more information about what services do, how and when to access them and what to expect. Confusion over when to seek help for mental health 'symptoms' was highlighted. More support for families was identified, alongside a need for health and social care staff to have a better understanding of the unique experiences and needs of veterans. Only 35% of staff reported a good understanding of the Armed Forces Covenant and their responsibilities to uphold it. CONCLUSIONS: Public health teams within UK local authorities are well placed to ensure veterans have more knowledge about and access to public services. Interventions to address stigma and veterans' reluctance to seek help were needed. To this end, interventions for local veterans, their loved ones and staff in public services, designed in co-creation with these groups, is discussed.
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Hernanz de Lucas R, Montero A, Candini D, Fernandez E, Sancho S. EP-1688: Low-dose radiotherapy in painful degenerative osteoarthritis: long-term efficacy and outcomes. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)31997-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Gutiérrez M, Bermudez J, Dávila-Sánchez A, Alegría-Acevedo L, Mendez L, Loguercio A, Buvinic S, Hernández-Moya N, Martin J, Fernandez E. Biological properties of universal adhesives containing zinc-oxide and copper nanoparticles. Dent Mater 2018. [DOI: 10.1016/j.dental.2018.08.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Gutiérrez M, Mendez-Bauer L, Alegría-Acevedo L, Dávila-Sánchez A, Bermudez J, Nuñez A, Reis A, Loguercio A, Farago P, Fernandez E. Effect of zinc/copper nanoparticles on bonding to artificially caries-affected dentin. Dent Mater 2018. [DOI: 10.1016/j.dental.2018.08.283] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Gutiérrez M, Alegría-Acevedo L, Mendez-Bauer L, Bermudez J, Dávila-Sánchez A, Reis A, Loguercio A, Farago P, Fernandez E. Adhesive performance of universal adhesives containing zinc-oxide and copper nanoparticles. Dent Mater 2018. [DOI: 10.1016/j.dental.2018.08.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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González-Chavarría I, Fernandez E, Gutierrez N, González-Horta EE, Sandoval F, Cifuentes P, Castillo C, Cerro R, Sanchez O, Toledo JR. LOX-1 activation by oxLDL triggers an epithelial mesenchymal transition and promotes tumorigenic potential in prostate cancer cells. Cancer Lett 2017; 414:34-43. [PMID: 29107109 DOI: 10.1016/j.canlet.2017.10.035] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 10/20/2017] [Accepted: 10/23/2017] [Indexed: 02/02/2023]
Abstract
Obesity is related to an increased risk of developing prostate cancer with high malignancy stages or metastasis. Recent results demonstrated that LOX-1, a receptor associated with obesity and atherosclerosis, is overexpressed in advanced and metastatic prostate cancer. Furthermore, high levels of oxLDL, the main ligand for LOX-1, have been found in patients with advanced prostate cancer. However, the role of LOX-1 in prostate cancer has not been unraveled completely yet. Here, we show that LOX-1 is overexpressed in prostate cancer cells and its activation by oxLDL promotes an epithelial to mesenchymal transition, through of lowered expression of epithelial markers (E-cadherin and plakoglobin) and an increased expression of mesenchymal markers (vimentin, N-cadherin, snail, slug, MMP-2 and MMP-9). Consequently, LOX-1 activation by oxLDL promotes actin cytoskeleton restructuration and MMP-2 and MMP-9 activity inducing prostate cancer cell invasion and migration. Additionally, LOX-1 increased the tumorigenic potential of prostate cancer cells and its expression was necessary for tumor growth in nude mice. In conclusion, our results suggest that oxLDL/LOX-1 could be ones of mechanisms that explain why obese patients with prostate cancer have an accelerated tumor progression and a greater probability of developing metastasis.
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Millares L, Alcaraz J, Martinez A, Benchea I, Carrasco J, De Cos JS, Gonzalez-Castro M, Blanco A, Sanchez-Gil R, Serra M, Rami-Porta R, Sauleda J, Fernandez E, Melchor R, Seijo L, De Esteban Julvez L, Barreiro E, Monsó E. P1.05-019 Effects of Tumor Stroma and Inflammation on Survival of Stage I-IIp Lung Cancer. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zimberg S, Richardson T, Sylvester J, Given R, Kipper M, Mantz C, Morris D, Perlmutter M, Song D, Fernandez E, Brookland R, Tchekmedyian N, Hafron J, Hartford A, Peddada A, Vacirca J, De Sanctis Y, Muenz-Wollny R, Conti P. Treatment Patterns, Patient Characteristics, and Preliminary Safety in the Radium-223 (Ra-223) REASSURE Observational Study. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Marchetti IA, Rosa EDL, Martinez V, Martinelli M, Sarmiento CS, Fernandez E. Biochemical pregnancy can be predicted by non-invasive analysis from metabolomic profiles of blastocysts. Fertil Steril 2017. [DOI: 10.1016/j.fertnstert.2017.07.481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Ferrinho AM, Peripolli E, Banchero G, Pereira ASC, Brito G, La Manna AF, Fernandez E, Montossi F, Baldi F. 365 Effect of growth rate on beef fatty acid profile from Hereford steers finished either on pasture or in feedlot. J Anim Sci 2017. [DOI: 10.2527/asasann.2017.365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Loguercio AD, Servat F, Stanislawczuk R, Mena-Serrano A, Rezende M, Prieto MV, Cereño V, Rojas MF, Ortega K, Fernandez E, Reis A. Effect of acidity of in-office bleaching gels on tooth sensitivity and whitening: a two-center double-blind randomized clinical trial. Clin Oral Investig 2017; 21:2811-2818. [PMID: 28303471 DOI: 10.1007/s00784-017-2083-5] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 02/16/2017] [Indexed: 11/26/2022]
Abstract
OBJECTIVES The study aimed to compare the tooth sensitivity (TS) and bleaching efficacy of two hydrogen peroxide gels with different pHs (acid pH [Pola Office, SDI] and the neutral pH [Pola Office+, SDI]) used for in-office bleaching. MATERIALS AND METHODS Fifty-four patients from Brazil and Chile, with right superior incisor darker than A2, were selected for this double-blind, split-mouth randomized trial. Teeth were bleached in two sessions, with 1-week interval. Each session had three applications of 8 min each, according to the manufacturer's instructions. The color changes were evaluated by subjective (Vita Classical and Vita Bleachedguide) and objective (Easy shade spectrophotometer) methods. Participants recorded TS with 0-10 visual analog scale. Color change in shade guide units (SGU) and ΔE was analyzed by Student's t test (α = 0.05). The absolute risk and intensity of TS were evaluated by McNemar's test and Wilcoxon-paired test, respectively (α = 0.05). RESULTS All groups achieved the same level of whitening after 30 days of clinical evaluation. The use of a neutral in-office bleaching gel significantly decreases the absolute risk of TS (28%, 95% CI 18-41) and intensity of TS when compared to the acid bleaching gel (absolute risk of 50%, 95% CI 37-63). CONCLUSION The use of a neutral in-office bleaching agent gel produced the same whitening degree than an acid bleaching gel but with reduced risk and intensity of tooth sensitivity. CLINICAL SIGNIFICANCE Clinicians should opt to use in-office bleaching with a neutral gel than an acid product because the former causes a significant lower risk and intensity of tooth sensitivity.
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Ortiz MJ, Grima Murcia MD, Fernandez E. Brain processing of visual metaphors: An electrophysiological study. Brain Cogn 2017; 113:117-124. [PMID: 28189898 DOI: 10.1016/j.bandc.2017.01.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 12/27/2016] [Accepted: 01/02/2017] [Indexed: 10/20/2022]
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Castaño-Castaño S, Garcia-Moll A, Morales-Navas M, Fernandez E, Sanchez-Santed F, Nieto-Escamez F. Transcranial direct current stimulation improves visual acuity in amblyopic Long-Evans rats. Brain Res 2017; 1657:340-346. [DOI: 10.1016/j.brainres.2017.01.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 11/28/2016] [Accepted: 01/01/2017] [Indexed: 10/20/2022]
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Rakislova N, Montironi C, Aldecoa I, Fernandez E, Bombi JA, Jimeno M, Balaguer F, Pellise M, Castells A, Cuatrecasas M. Lymph node pooling: a feasible and efficient method of lymph node molecular staging in colorectal carcinoma. J Transl Med 2017; 15:14. [PMID: 28088238 PMCID: PMC5237515 DOI: 10.1186/s12967-016-1114-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 12/22/2016] [Indexed: 01/11/2023] Open
Abstract
Background Pathologic lymph node staging is becoming a deficient method in the demanding molecular era. Nevertheless, the use of more sensitive molecular analysis for nodal staging is hampered by its high costs and extensive time requirements. Our aim is to take a step forward in colon cancer (CC) lymph node (LN) pathology diagnosis by proposing a feasible and efficient molecular method in routine practice using reverse transcription loop-mediated isothermal amplification (RT-LAMP). Results Molecular detection of tumor cytokeratin 19 (CK19) mRNA with RT-LAMP was performed in 3206 LNs from 188 CC patients using two methods: individual analysis of 1449 LNs from 102 patients (individual cohort), and pooled LN analysis of 1757 LNs from 86 patients (pooling cohort). A median of 13 LNs (IQR 10–18) per patient were harvested in the individual cohort, and 18 LNs (IQR 13–25) per patient in the pooling cohort (p ≤ 0.001). The median of molecular assays performed in the pooling cohort was 2 per patient (IQR 1–3), saving a median of 16 assays/patient. The number of molecular assays performed in the individual cohort was 13 (IQR 10–18), corresponding to the number of LNs to be analyzed. The sensitivity and specificity of the pooling method for LN involvement (assessed by hematoxylin and eosin) were 88.9% (95% CI 56.5–98.0) and 79.2% (95% CI 68.9–86.8), respectively; concordance, 80.2%; PPV, 33.3%; NPV, 98.4%. The individual method had 100% sensitivity (95% CI 72.2–100), 44.6% specificity (95% CI 34.8–54.7), 50% concordance, 16.4% PPV, and 100% NPV. The amount of tumor burden detected in all LNs of a case, or total tumor load (TTL) was similar in both cohorts (p = 0.228). Conclusions LN pooling makes it possible to analyze a high number of LNs from surgical colectomies with few molecular tests per patient. This approach enables a feasible means to integrate LN molecular analysis from CC specimens into pathology diagnosis and provides a more accurate LN pathological staging with potential prognostic implications.
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Fernandez E, Centeno T, Stoeckli F. Chars and Activated Carbons Prepared from Asturian Apple Pulp. ADSORPT SCI TECHNOL 2016. [DOI: 10.1260/0263617011494466] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Martinez JM, Alekseev A, Sborchia C, Choi C, Utin Y, Jun C, Terasawa A, Popova E, Xiang B, Sannazaro G, Lee A, Martin A, Teissier P, Sabourin F, Caixas J, Fernandez E, Zarzalejos J, Kim HS, Kim Y, Privalova E, Du S, Wang S, Albin V, Gaucher T, Borrelly S, Cambazar M, Sfarni S. ITER vacuum vessel structural analysis completion during manufacturing phase. FUSION ENGINEERING AND DESIGN 2016. [DOI: 10.1016/j.fusengdes.2016.02.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Belecanech G, Goldstein M, Fernandez E, Dvorin D. P002 Predictive value of skin testing to omalizumab and excipients. Ann Allergy Asthma Immunol 2016. [DOI: 10.1016/j.anai.2016.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Finkelstein S, Forman J, Fernandez E, Chen C, Lieberfarb M, Salenius S, Dosoretz D, Dosoretz A, Shafman T, Mantz C. Multicenter Assessment of Stereotactic Body Radiation Therapy (SBRT) Boost in Intermediate-Risk Prostate Cancer: Biochemical Failure and Toxicity. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.1331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ferraris G, Diaz Vazquez M, Ferraris M, Fernandez E, Richardet E. Prognostic Value of HER2/Neu Overexpression and Genetic Category in Patients Age 70 and Older with Breast Cancer: Ten-Year Results. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ahamad A, Salenius S, Ross R, Fernandez E. Bladder Preservation Strategies in a Multicenter Community Setting Produces Outcomes Comparable to Prospective Radiation Therapy Oncology Group (RTOG) Protocols. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.1210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Lopez-Gordo MA, Grima Murcia MD, Padilla P, Pelayo F, Fernandez E. Asynchronous Detection of Trials Onset from Raw EEG Signals. Int J Neural Syst 2016; 26:1650034. [PMID: 27377663 DOI: 10.1142/s0129065716500349] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Clinical processing of event-related potentials (ERPs) requires a precise synchrony between the stimulation and the acquisition units that are guaranteed by means of a physical link between them. This precise synchrony is needed since temporal misalignments during trial averaging can lead to high deviations of peak times, thus causing error in diagnosis or inefficiency in classification in brain-computer interfaces (BCIs). Out of the laboratory, mobile EEG systems and BCI headsets are not provided with the physical link, thus being inadequate for acquisition of ERPs. In this study, we propose a method for the asynchronous detection of trials onset from raw EEG without physical links. We validate it with a BCI application based on the dichotic listening task. The user goal was to attend the cued auditory message and to report three keywords contained in it while ignoring the other message. The BCI goal was to detect the attended message from the analysis of auditory ERPs. The rate of successful onset detection in both synchronous (using the real onset) and asynchronous (blind detection of trial onset from raw EEG) was 73% with a synchronization error of less than 1[Formula: see text]ms. The level of synchronization provided by this proposal would allow home-based acquisition of ERPs with low cost BCI headsets and any media player unit without physical links between them.
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