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Lefebvre J, Hutt A. Induced synchronization by endogenous noise modulation in finite-size random neural networks: A stochastic mean-field study. Chaos 2023; 33:123110. [PMID: 38055720 DOI: 10.1063/5.0167771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 11/09/2023] [Indexed: 12/08/2023]
Abstract
Event-related synchronization and desynchronization (ERS/ERD) are well-known features found experimentally in brain signals during cognitive tasks. Their understanding promises to have much better insights into neural information processes in cognition. Under the hypothesis that neural information affects the endogenous neural noise level in populations, we propose to employ a stochastic mean-field model to explain ERS/ERD in the γ-frequency range. The work extends previous mean-field studies by deriving novel effects from finite network size. Moreover, numerical simulations of ERS/ERD and their analytical explanation by the mean-field model suggest several endogenous noise modulation schemes, which may modulate the system's synchronization.
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Affiliation(s)
- J Lefebvre
- Krembil Brain Institute, University Health Network, Toronto, Ontario M5T 0S8, Canada
- Department of Biology, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
- Department of Mathematics, University of Toronto, Toronto, Ontario M5S 2E4, Canada
| | - A Hutt
- ICube, MLMS, University of Strasbourg, MIMESIS Team, Inria Nancy-Grand Est, 67000 Strasbourg, France
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Vallet Y, Lefebvre J, Laurent C, Rahouadj R, Morel O, Bertholdt C. A preliminary quantification of the clinical gesture during vacuum assisted delivery on a training dummy. Clin Biomech (Bristol, Avon) 2023; 109:106093. [PMID: 37734119 DOI: 10.1016/j.clinbiomech.2023.106093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 09/05/2023] [Accepted: 09/12/2023] [Indexed: 09/23/2023]
Abstract
BACKGROUND The vacuum assisted delivery represents, in France, the most used operative vaginal delivery technique. The purpose was to provide a preliminar quantification of the operator's hand kinematics while performing a vacuum assisted delivery. METHODS A group of 21 participants composed of 12 trainees and 9 obstetricians were recorded performing a vacuum assisted delivery on a training dummy, the matching fetal presentation was a left occiput anterior position. FINDINGS The mean movement was composed of a first phase corresponding to a descendant pull, followed by an ascendant finish of the gesture. No significative difference were found between the trainees and the obstetricians' mean gesture. INTERPRETATION This is the first quantification of the clinical gesture associated with the vacuum assisted delivery.
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Affiliation(s)
- Y Vallet
- CNRS UMR 7239 LEM3 - Université de Lorraine, Nancy, France.
| | - J Lefebvre
- Université de Lorraine, CHRU-NANCY, Pôle de la Femme, F-54000 Nancy, France
| | - C Laurent
- CNRS UMR 7239 LEM3 - Université de Lorraine, Nancy, France
| | - R Rahouadj
- CNRS UMR 7239 LEM3 - Université de Lorraine, Nancy, France
| | - O Morel
- Université de Lorraine, CHRU-NANCY, Pôle de la Femme, F-54000 Nancy, France; IADI, INSERM U1254, Rue du Morvan, 54500 Vandoeuvre-lès-Nancy, France
| | - C Bertholdt
- Université de Lorraine, CHRU-NANCY, Pôle de la Femme, F-54000 Nancy, France; IADI, INSERM U1254, Rue du Morvan, 54500 Vandoeuvre-lès-Nancy, France
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Sjoberg HT, Philippou Y, Magnussen AL, Tullis IDC, Bridges E, Chatrian A, Lefebvre J, Tam KH, Murphy EA, Rittscher J, Preise D, Agemy L, Yechezkel T, Smart SC, Kinchesh P, Gilchrist S, Allen DP, Scheiblin DA, Lockett SJ, Wink DA, Lamb AD, Mills IG, Harris A, Muschel RJ, Vojnovic B, Scherz A, Hamdy FC, Bryant RJ. Tumour irradiation combined with vascular-targeted photodynamic therapy enhances antitumour effects in pre-clinical prostate cancer. Br J Cancer 2021; 125:534-546. [PMID: 34155340 PMCID: PMC8367986 DOI: 10.1038/s41416-021-01450-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 04/29/2021] [Accepted: 05/25/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND There is a need to improve the treatment of prostate cancer (PCa) and reduce treatment side effects. Vascular-targeted photodynamic therapy (VTP) is a focal therapy for low-risk low-volume localised PCa, which rapidly disrupts targeted tumour vessels. There is interest in expanding the use of VTP to higher-risk disease. Tumour vasculature is characterised by vessel immaturity, increased permeability, aberrant branching and inefficient flow. FRT alters the tumour microenvironment and promotes transient 'vascular normalisation'. We hypothesised that multimodality therapy combining fractionated radiotherapy (FRT) and VTP could improve PCa tumour control compared against monotherapy with FRT or VTP. METHODS We investigated whether sequential delivery of FRT followed by VTP 7 days later improves flank TRAMP-C1 PCa tumour allograft control compared to monotherapy with FRT or VTP. RESULTS FRT induced 'vascular normalisation' changes in PCa flank tumour allografts, improving vascular function as demonstrated using dynamic contrast-enhanced magnetic resonance imaging. FRT followed by VTP significantly delayed tumour growth in flank PCa allograft pre-clinical models, compared with monotherapy with FRT or VTP, and improved overall survival. CONCLUSION Combining FRT and VTP may be a promising multimodal approach in PCa therapy. This provides proof-of-concept for this multimodality treatment to inform early phase clinical trials.
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Affiliation(s)
- Hanna T Sjoberg
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
| | | | - Anette L Magnussen
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
| | | | - Esther Bridges
- Department of Oncology, University of Oxford, Oxford, UK
| | - Andrea Chatrian
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford, UK
| | - Joel Lefebvre
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford, UK
| | - Ka Ho Tam
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford, UK
| | - Emma A Murphy
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
- Department of Oncology, University of Oxford, Oxford, UK
| | - Jens Rittscher
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford, UK
- Ludwig Institute for Cancer Research, Nuffield Department of Medicine, University of Oxford, Oxford, UK
- Target Discovery Institute, NDM Research Building, University of Oxford, Headington, UK
| | - Dina Preise
- Department of Core Facilities, The Weizmann Institute of Science, Rehovot, Israel
| | - Lilach Agemy
- Department of Plant and Environmental Sciences, The Weizmann Institute of Science, Rehovot, Israel
| | - Tamar Yechezkel
- Department of Plant and Environmental Sciences, The Weizmann Institute of Science, Rehovot, Israel
| | - Sean C Smart
- Department of Oncology, University of Oxford, Oxford, UK
| | - Paul Kinchesh
- Department of Oncology, University of Oxford, Oxford, UK
| | | | - Danny P Allen
- Department of Oncology, University of Oxford, Oxford, UK
| | - David A Scheiblin
- Optical Microscopy and Analysis Laboratory, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research Inc. for the National Cancer Institute, National Institutes of Health, Frederick, MD, USA
| | - Stephen J Lockett
- Optical Microscopy and Analysis Laboratory, Frederick National Laboratory for Cancer Research, Leidos Biomedical Research Inc. for the National Cancer Institute, National Institutes of Health, Frederick, MD, USA
| | - David A Wink
- Cancer and Inflammation Program, Centre for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD, USA
| | - Alastair D Lamb
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
| | - Ian G Mills
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
| | - Adrian Harris
- Department of Oncology, University of Oxford, Oxford, UK
| | - Ruth J Muschel
- Department of Oncology, University of Oxford, Oxford, UK
| | - Boris Vojnovic
- Department of Oncology, University of Oxford, Oxford, UK
| | - Avigdor Scherz
- Department of Plant and Environmental Sciences, The Weizmann Institute of Science, Rehovot, Israel
| | - Freddie C Hamdy
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
| | - Richard J Bryant
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK.
- Department of Oncology, University of Oxford, Oxford, UK.
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4
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Danielou M, Sarter H, Pariente B, Fumery M, Ley D, Mamona C, Barthoulot M, Charpentier C, Siproudhis L, Savoye G, Gower-Rousseau C, Andre JM, Antonietti M, Aouakli A, Armand A, Aroichane I, Assi F, Aubet JP, Auxenfants E, Ayafi-Ramelot F, Azzouzi K, Bankovski D, Barbry B, Bardoux N, Baron P, Baudet A, Bazin B, Bebahani A, Becqwort JP, Benet V, Benali H, Benguigui C, Ben Soussan E, Bental A, Berkelmans I, Bernet J, Bernou K, Bernou-Dron C, Bertot P, Bertiaux-Vandaële N, Bertrand V, Billoud E, Biron N, Bismuth B, Bleuet M, Blondel F, Blondin V, Bohon P, Boniface E, Bonnière P, Bonvarlet E, Bonvarlet P, Boruchowicz A, Bostvironnois R, Boualit M, Bouche B, Boudaillez C, Bourgeaux C, Bourgeois M, Bourguet A, Bourienne A, Branche J, Bray G, Brazier F, Breban P, Bridenne M, Brihier H, Brung-Lefebvre V, Bulois P, Burgiere P, Butel J, Canva JY, Canva-Delcambre V, Capron JP, Cardot F, Carpentier P, Cartier E, Cassar JF, Cassagnou M, Castex JF, Catala P, Cattan S, Catteau S, Caujolle B, Cayron G, Chandelier C, Chantre M, Charles J, Charneau T, Chavance-Thelu M, Chirita D, Choteau A, Claerbout JF, Clergue PY, Coevoet H, Cohen G, Collet R, Colombel JF, Coopman S, Corvisart J, Cortot A, Couttenier F, Crinquette JF, Crombe V, Dadamessi I, Dapvril V, Davion T, Dautreme S, Debas J, Degrave N, Dehont F, Delatre C, Delcenserie R, Delette O, Delgrange T, Delhoustal L, Delmotte JS, Demmane S, Deregnaucourt G, Descombes P, Desechalliers JP, Desmet P, Desreumaux P, Desseaux G, Desurmont P, Devienne A, Devouge E, Devred M, Devroux A, Dewailly A, Dharancy S, Di Fiore A, Djeddi D, Djedir R, Dreher-Duwat ML, Dubois R, Dubuque C, Ducatillon P, Duclay J, Ducrocq B, Ducrot F, Ducrotte P, Dufilho A, Duhamel C, Dujardin D, Dumant-Forest C, Dupas JL, Dupont F, Duranton Y, Duriez A, El Achkar K, El Farisi M, Elie C, Elie-Legrand MC, Elkhaki A, Eoche M, Evrard D, Evrard JP, Fatome A, Filoche B, Finet L, Flahaut M, Flamme C, Foissey D, Fournier P, Foutrein-Comes MC, Foutrein P, Fremond D, Frere T, Fumery M, Gallet P, Gamblin C, Ganga S, Gerard R, Geslin G, Gheyssens Y, Ghossini N, Ghrib S, Gilbert T, Gillet B, Godard D, Godard P, Godchaux JM, Godchaux R, Goegebeur G, Goria O, Gottrand F, Gower P, Grandmaison B, Groux M, Guedon C, Guillard JF, Guillem L, Guillemot F, Guimberd D, Haddouche B, Hakim S, Hanon D, Hautefeuille V, Heckestweiller P, Hecquet G, Hedde JP, Hellal H, Henneresse PE, Heyman B, Heraud M, Herve S, Hochain P, Houssin-Bailly L, Houcke P, Huguenin B, Iobagiu S, Ivanovic A, Iwanicki-Caron I, Janicki E, Jarry M, Jeu J, Joly JP, Jonas C, Katherin F, Kerleveo A, Khachfe A, Kiriakos A, Kiriakos J, Klein O, Kohut M, Kornhauser R, Koutsomanis D, Laberenne JE, Laffineur G, Lagarde M, Lalanne A, Lannoy P, Lapchin J, Laprand M, Laude D, Leblanc R, Lecieux P, Leclerc N, Le Couteulx C, Ledent J, Lefebvre J, Lefiliatre P, Legrand C, Le Grix A, Lelong P, Leluyer B, Lenaerts C, Lepileur L, Leplat A, Lepoutre-Dujardin E, Leroi H, Leroy MY, Lesage JP, Lesage X, Lesage J, Lescanne-Darchis I, Lescut J, Lescut D, Leurent B, Levy P, Lhermie M, Lion A, Lisambert B, Loire F, Louf S, Louvet A, Luciani M, Lucidarme D, Lugand J, Macaigne O, Maetz D, Maillard D, Mancheron H, Manolache O, Marks-Brunel AB, Marti R, Martin F, Martin G, Marzloff E, Mathurin P, Mauillon J, Maunoury V, Maupas JL, Mesnard B, Metayer P, Methari L, Meurisse B, Meurisse F, Michaud L, Mirmaran X, Modaine P, Monthe A, Morel L, Mortier PE, Moulin E, Mouterde O, Mudry J, Nachury M, N’Guyen Khac E, Notteghem B, Ollevier V, Ostyn A, Ouraghi A, Ouvry D, Paillot B, Panien-Claudot N, Paoletti C, Papazian A, Parent B, Pariente B, Paris JC, Patrier P, Paupart L, Pauwels B, Pauwels M, Petit R, Piat M, Piotte S, Plane C, Plouvier B, Pollet E, Pommelet P, Pop D, Pordes C, Pouchain G, Prades P, Prevost A, Prevost JC, Quesnel B, Queuniet AM, Quinton JF, Rabache A, Rabelle P, Raclot G, Ratajczyk S, Rault D, Razemon V, Reix N, Revillon M, Richez C, Robinson P, Rodriguez J, Roger J, Roux JM, Rudelli A, Saber A, Savoye G, Schlosseberg P, Segrestin M, Seguy D, Serin M, Seryer A, Sevenet F, Shekh N, Silvie J, Simon V, Spyckerelle C, Talbodec N, Techy A, Thelu JL, Thevenin A, Thiebault H, Thomas J, Thorel JM, Tielman G, Tode M, Toisin J, Tonnel J, Touchais JY, Touze Y, Tranvouez JL, Triplet C, Turck D, Uhlen S, Vaillant E, Valmage C, Vanco D, Vandamme H, Vanderbecq E, Vander Eecken E, Vandermolen P, Vandevenne P, Vandeville L, Vandewalle A, Vandewalle C, Vaneslander P, Vanhoove JP, Vanrenterghem A, Varlet P, Vasies I, Verbiese G, Vernier-Massouille G, Vermelle P, Verne C, Vezilier-Cocq P, Vigneron B, Vincendet M, Viot J, Voiment YM, Wacrenier A, Waeghemaecker L, Wallez JY, Wantiez M, Wartel F, Weber J, Willocquet JL, Wizla N, Wolschies E, Zalar A, Zaouri B, Zellweger A, Ziade C. Natural History of Perianal Fistulising Lesions in Patients With Elderly-onset Crohn's Disease: A Population-based Study. J Crohns Colitis 2020; 14:501-507. [PMID: 31637413 DOI: 10.1093/ecco-jcc/jjz173] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
INTRODUCTION Most studies of elderly-onset Crohn's disease [CD; diagnosed in patients aged 60 or over] have described a mild course. However, data on the natural history of perianal fistulising CD [pfCD] in this population are scarce. In a population-based cohort study, we described the prevalence, natural history, and treatment of pfCD in patients with elderly-onset CD vs patients with paediatric-onset CD. METHOD All patients diagnosed with CD at or after the age of 60 between 1988 and 2006, were included [n = 372]. Logistic regression, Cox models, and a nested case-control method were used to identify factors associated with pfCD. RESULTS A total of 34 elderly patients [9% of the 372] had pfCD at diagnosis. After a median follow-up of 6 years (interquartile range [IQR]: 3; 10), 59 patients [16%] had pfCD; the same prevalence [16%] was observed in paediatric-onset patients. At last follow-up, anal incontinence was more frequent in elderly patients with pfCD than in elderly patients without pfCD [22% vs 4%, respectively; p < 10-4]. Rectal CD at diagnosis was associated with pfCD: hazard ratio (95% confidence interval [CI] = 2.8 [1.6-5.0]). Although 37% of the patients received immunosuppressants and 17% received anti-tumour necrosis factor agents, 24% [14 out of 59] had a definitive stoma at last follow-up. CONCLUSION During the first 6 years of disease, the prevalence of pfCD was similar in elderly and paediatric patients. Rectal involvement was associated with the appearance of pfCD in elderly-onset patients. Around a quarter of patients with elderly-onset CD will have a stoma. Our results suggest that treatment with biologics should be evaluated in these patients.
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Affiliation(s)
- Marie Danielou
- Gastroenterology Unit, EPIMAD Registry, University of Rouen and Rouen University Hospital, Rouen, France
| | - Hélène Sarter
- Public Health, Epidemiology and Economic Health Unit, EPIMAD Registry, Maison Régionale de la Recherche Clinique, University of Lille and Lille University Hospital, Lille, France.,LIRIC UMR 995, Team 5, INSERM and University of Lille, Lille, France
| | - Benjamin Pariente
- Gastroenterology Unit, EPIMAD Registry, Hôpital Huriez, Lille University Hospital, Lille, France
| | - Mathurin Fumery
- Gastroenterology Unit, EPIMAD Registry, and PeriTox, UMR I-01, University of Amiens and Amiens University Hospital, Amiens, France
| | - Delphine Ley
- Division of Gastroenterology, Hepatology and Nutrition, Department of Paediatrics, Jeanne de Flandre Children's Hospital and University of Lille, Lille, France
| | - Christel Mamona
- Public Health, Epidemiology and Economic Health Unit, EPIMAD Registry, Maison Régionale de la Recherche Clinique, University of Lille and Lille University Hospital, Lille, France
| | - Maël Barthoulot
- Public Health, Epidemiology and Economic Health Unit, EPIMAD Registry, Maison Régionale de la Recherche Clinique, University of Lille and Lille University Hospital, Lille, France
| | - Cloé Charpentier
- Gastroenterology Unit, EPIMAD Registry, University of Rouen and Rouen University Hospital, Rouen, France
| | | | - Guillaume Savoye
- Gastroenterology Unit, EPIMAD Registry, University of Rouen and Rouen University Hospital, Rouen, France
| | - Corinne Gower-Rousseau
- Public Health, Epidemiology and Economic Health Unit, EPIMAD Registry, Maison Régionale de la Recherche Clinique, University of Lille and Lille University Hospital, Lille, France.,LIRIC UMR 995, Team 5, INSERM and University of Lille, Lille, France
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Delafontaine-Martel P, Lefebvre J, Tardif PL, Lévy BI, Pouliot P, Lesage F. Whole brain vascular imaging in a mouse model of Alzheimer's disease with two-photon microscopy. J Biomed Opt 2018; 23:1-10. [PMID: 29998647 DOI: 10.1117/1.jbo.23.7.076501] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 06/21/2018] [Indexed: 06/08/2023]
Abstract
Given known correlations between vascular health and cognitive impairment, the development of tools to image microvasculature in the whole brain could help investigate these correlations. We explore the feasibility of using an automated serial two-photon microscope to image fluorescent gelatin-filled whole rodent brains in three-dimensions (3-D) with the goal of carrying group studies. Vascular density (VD) was computed using automatic segmentation combined with coregistration techniques to build a group-level vascular metric in the whole brain. Focusing on the medial prefrontal cortex, cerebral cortex, the olfactory bulb, and the hippocampal formation, we compared the VD of three age groups (2-, 4.5-, and 8-months-old), for both wild type mice and a transgenic model (APP/PS1) with pathology resembling Alzheimer's disease (AD). We report a general loss of VD caused by the aging process with a small VD increase in the diseased animals in the somatomotor and somatosensory cortical regions and the olfactory bulb, partly supported by MRI perfusion data. This study supports previous observations that AD transgenic mice show a higher VD in specific regions compared with WT mice during the early and late stages of the disease (4.5 to 8 months), extending results to whole brain mapping.
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Affiliation(s)
| | - Joel Lefebvre
- Ecole Polytechnique Montréal, Department of Electrical Engineering, Quebec, Canada
| | - Pier-Luc Tardif
- Ecole Polytechnique Montréal, Department of Electrical Engineering, Quebec, Canada
| | - Bernard I Lévy
- Vessels and Blood Institute, Inserm U970 and Hôpital Lariboisière, Paris, France
| | - Philippe Pouliot
- Ecole Polytechnique Montréal, Department of Electrical Engineering, Quebec, Canada
- Montreal Heart Institute, Research Centre, Montreal, Quebec, Canada
| | - Frédéric Lesage
- Ecole Polytechnique Montréal, Department of Electrical Engineering, Quebec, Canada
- Montreal Heart Institute, Research Centre, Montreal, Quebec, Canada
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Ghione S, Sarter H, Fumery M, Armengol-Debeir L, Savoye G, Ley D, Spyckerelle C, Pariente B, Peyrin-Biroulet L, Turck D, Gower-Rousseau C, Andre JM, Antonietti M, Aouakli A, Armand A, Aroichane I, Assi F, Aubet JP, Auxenfants E, Ayafi-Ramelot F, Bankovski D, Barbry B, Bardoux N, Baron P, Baudet A, Bazin B, Bebahani A, Becqwort JP, Benet V, Benali H, Benguigui C, Soussan BE, Bental A, Berkelmans I, Bernet J, Bernou K, Bernou-Dron C, Bertot P, Bertiaux-Vandaële N, Bertrand V, Billoud E, Biron N, Bismuth B, Bleuet M, Blondel F, Blondin V, Bohon P, Boniface E, Bonnière P, Bonvarlet E, Bonvarlet P, Boruchowicz A, Bostvironnois R, Boualit M, Bouche B, Boudaillez C, Bourgeaux C, Bourgeois M, Bourguet A, Bourienne A, Branche J, Bray G, Brazier F, Breban P, Brihier H, Brung-Lefebvre V, Bulois P, Burgiere P, Butel J, Canva JY, Canva-Delcambre V, Capron JP, Cardot F, Carpentier P, Cartier E, Cassar JF, Cassagnou M, Castex JF, Catala P, Cattan S, Catteau S, Caujolle B, Cayron G, Chandelier C, Chantre M, Charles J, Charneau T, Chavance-Thelu M, Chirita D, Choteau A, Claerbout JF, Clergue PY, Coevoet H, Cohen G, Collet R, Colombel JF, Coopman S, Corvisart J, Cortot A, Couttenier F, Crinquette JF, Crombe V, Dadamessi I, Dapvril V, Davion T, Dautreme S, Debas J, Degrave N, Dehont F, Delatre C, Delcenserie R, Delette O, Delgrange T, Delhoustal L, Delmotte JS, Demmane S, Deregnaucourt G, Descombes P, Desechalliers JP, Desmet P, Desreumaux P, Desseaux G, Desurmont P, Devienne A, Devouge E, Devred M, Devroux A, Dewailly A, Dharancy S, Di Fiore A, Djeddi D, Djedir R, Dreher-Duwat ML, Dubois R, Dubuque C, Ducatillon P, Duclay J, Ducrocq B, Ducrot F, Ducrotte P, Dufilho A, Duhamel C, Dujardin D, Dumant-Forest C, Dupas JL, Dupont F, Duranton Y, Duriez A, El Achkar K, El Farisi M, Elie C, Elie-Legrand MC, Elkhaki A, Eoche M, Evrard D, Evrard JP, Fatome A, Filoche B, Finet L, Flahaut M, Flamme C, Foissey D, Fournier P, Foutrein-Comes MC, Foutrein P, Fremond D, Frere T, Fumery M, Gallet P, Gamblin C, Ganga-Zandzou PS, Gérard R, Geslin G, Gheyssens Y, Ghossini N, Ghrib S, Gilbert T, Gillet B, Godard D, Godard P, Godchaux JM, Godchaux R, Goegebeur G, Goria O, Gottrand F, Gower P, Grandmaison B, Groux M, Guedon C, Guillard JF, Guillem L, Guillemot F, Guimber D, Haddouche B, Hakim S, Hanon D, Hautefeuille V, Heckestweiller P, Hecquet G, Hedde JP, Hellal H, Henneresse PE, Heyman B, Heraud M, Herve S, Hochain P, Houssin-Bailly L, Houcke P, Huguenin B, Iobagiu S, Ivanovic A, Iwanicki-Caron I, Janicki E, Jarry M, Jeu J, Joly JP, Jonas C, Katherin F, Kerleveo A, Khachfe A, Kiriakos A, Kiriakos J, Klein O, Kohut M, Kornhauser R, Koutsomanis D, Laberenne JE, Laffineur G, Lagarde M, Lannoy P, Lapchin J, Lapprand M, Laude D, Leblanc R, Lecieux P, Leclerc N, Le Couteulx C, Ledent J, Lefebvre J, Lefiliatre P, Legrand C, Le Grix A, Lelong P, Leluyer B, Lenaerts C, Lepileur L, Leplat A, Lepoutre-Dujardin E, Leroi H, Leroy MY, Lesage JP, Lesage X, Lesage J, Lescanne-Darchis I, Lescut J, Lescut D, Leurent B, Levy P, Lhermie M, Lion A, Lisambert B, Loire F, Louf S, Louvet A, Luciani M, Lucidarme D, Lugand J, Macaigne O, Maetz D, Maillard D, Mancheron H, Manolache O, Marks-Brunel AB, Marti R, Martin F, Martin G, Marzloff E, Mathurin P, Mauillon J, Maunoury V, Maupas JL, Mesnard B, Metayer P, Methari L, Meurisse B, Meurisse F, Michaud L, Mirmaran X, Modaine P, Monthe A, Morel L, Mortier PE, Moulin E, Mouterde O, Mudry J, Nachury M, Khac NE, Notteghem B, Ollevier V, Ostyn A, Ouraghi A, Ouvry D, Paillot B, Panien-Claudot N, Paoletti C, Papazian A, Parent B, Pariente B, Paris JC, Patrier P, Paupart L, Pauwels B, Pauwels M, Petit R, Piat M, Piotte S, Plane C, Plouvier B, Pollet E, Pommelet P, Pop D, Pordes C, Pouchain G, Prades P, Prevost A, Prevost JC, Quesnel B, Queuniet AM, Quinton JF, Rabache A, Rabelle P, Raclot G, Ratajczyk S, Rault D, Razemon V, Reix N, Revillon M, Richez C, Robinson P, Rodriguez J, Roger J, Roux JM, Rudelli A, Saber A, Savoye G, Schlosseberg P, Segrestin M, Seguy D, Serin M, Seryer A, Sevenet F, Shekh N, Silvie J, Simon V, Spyckerelle C, Talbodec N, Techy A, Thelu JL, Thevenin A, Thiebault H, Thomas J, Thorel JM, Tielman G, Tode M, Toisin J, Tonnel J, Touchais JY, Touze Y, Tranvouez JL, Triplet C, Turck D, Uhlen S, Vaillant E, Valmage C, Vanco D, Vandamme H, Vanderbecq E, Eecken VE, Vandermolen P, Vandevenne P, Vandeville L, Vandewalle A, Vandewalle C, Vaneslander P, Vanhoove JP, Vanrenterghem A, Varlet P, Vasies I, Verbiese G, Vernier-Massouille G, Vermelle P, Verne C, Vezilier-Cocq P, Vigneron B, Vincendet M, Viot J, Voiment YM, Wacrenier A, Waeghemaecker L, Wallez JY, Wantiez M, Wartel F, Weber J, Willocquet JL, Wizla N, Wolschies E, Zalar A, Zaouri B, Zellweger A, Ziade C. Dramatic Increase in Incidence of Ulcerative Colitis and Crohn's Disease (1988-2011): A Population-Based Study of French Adolescents. Am J Gastroenterol 2018; 113:265-272. [PMID: 28809388 DOI: 10.1038/ajg.2017.228] [Citation(s) in RCA: 101] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 06/08/2017] [Indexed: 02/07/2023]
Abstract
OBJECTIVES Few data are available to describe the changes in incidence of pediatric-onset inflammatory bowel disease (IBD). The aim of this study was to describe changes in incidence and phenotypic presentation of pediatric-onset IBD in northern France during a 24-year period. METHODS Pediatric-onset IBD (<17 years) was issued from a population-based IBD study in France between 1988 and 2011. Age groups and digestive location were defined according to the Paris classification. RESULTS 1,350 incident cases were recorded (8.3% of all IBD) including 990 Crohn's disease (CD), 326 ulcerative colitis (UC) and 34 IBD unclassified (IBDU). Median age at diagnosis was similar in CD (14.4 years (Q1=11.8-Q3=16.0)) and UC (14.0 years (11.0-16.0)) and did not change over time. There were significantly more males with CD (females/males=0.82) than UC (females/males=1.25) (P=0.0042). Median time between onset of symptoms and IBD diagnosis was consistently 3 months (1-6). Mean incidence was 4.4/105 for IBD overall (3.2 for CD, 1.1 for UC and 0.1 for IBDU). From 1988-1990 to 2009-2011, a dramatic increase in incidences of both CD and UC were observed in adolescents (10-16 years): for CD from 4.2 to 9.5/105 (+126%; P<0.001) and for UC, from 1.6 to 4.1/105 (+156%; P<0.001). No modification in age or location at diagnosis was observed in either CD or UC. CONCLUSIONS In this population-based study, CD and UC incidences increased dramatically in adolescents across a 24-year span, suggesting that one or more strong environmental factors may predispose this population to IBD.
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Affiliation(s)
- Silvia Ghione
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Lille University Jeanne de Flandre Children's Hospital and Faculty of Medicine, Lille, France
| | - Hélène Sarter
- Public Health, Epidemiology and Economic Health, Epimad registry, Regional house of clinical research, Lille Hospital and University, Lille, France.,Lille Inflammation Research International Center LIRIC-UMR 995 Inserm-"IBD and environmental factors: epidemiology and functional analyses", Lille University, Lille, France
| | - Mathurin Fumery
- Gastroenterology Unit, Epimad registry, Amiens Hospital and University, Amiens, France
| | - Laura Armengol-Debeir
- Gastroenterology Unit, Epimad registry, Rouen Hospital and University, Rouen, France
| | - Guillaume Savoye
- Gastroenterology Unit, Epimad registry, Rouen Hospital and University, Rouen, France
| | - Delphine Ley
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Lille University Jeanne de Flandre Children's Hospital and Faculty of Medicine, Lille, France.,Lille Inflammation Research International Center LIRIC-UMR 995 Inserm-"IBD and environmental factors: epidemiology and functional analyses", Lille University, Lille, France
| | - Claire Spyckerelle
- Department of Pediatrics, St Vincent de Paul Hospital and Lille Catholic University, Lille, France
| | - Benjamin Pariente
- Lille Inflammation Research International Center LIRIC-UMR 995 Inserm-"IBD and environmental factors: epidemiology and functional analyses", Lille University, Lille, France.,Gastroenterology Unit, Epimad registry, Lille Hospital and University, Lille, France
| | | | - Dominique Turck
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Lille University Jeanne de Flandre Children's Hospital and Faculty of Medicine, Lille, France.,Lille Inflammation Research International Center LIRIC-UMR 995 Inserm-"IBD and environmental factors: epidemiology and functional analyses", Lille University, Lille, France
| | - Corinne Gower-Rousseau
- Public Health, Epidemiology and Economic Health, Epimad registry, Regional house of clinical research, Lille Hospital and University, Lille, France.,Lille Inflammation Research International Center LIRIC-UMR 995 Inserm-"IBD and environmental factors: epidemiology and functional analyses", Lille University, Lille, France
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Duricova D, Leroyer A, Savoye G, Sarter H, Pariente B, Aoucheta D, Armengol-Debeir L, Ley D, Turck D, Peyrin-Biroulet L, Gower-Rousseau C, Fumery M, Antonietti M, Aouakli A, Armand A, Aroichane I, Assi F, Aubet JP, Auxenfants E, Ayafi-Ramelot F, Bankovski D, Barbry B, Bardoux N, Baron P, Baudet A, Bazin B, Bebahani A, Becqwort JP, Benet V, Benali H, Benguigui C, Ben Soussan E, Bental A, Berkelmans I, Bernet J, Bernou K, Bernou-Dron C, Bertot P, Bertiaux-Vandaële N, Bertrand V, Billoud E, Biron N, Bismuth B, Bleuet M, Blondel F, Blondin V, Bohon P, Boniface E, Bonnière P, Bonvarlet E, Bonvarlet P, Boruchowicz A, Bostvironnois R, Boualit M, Bouche B, Boudaillez C, Bourgeaux C, Bourgeois M, Bourguet A, Bourienne A, Branche J, Bray G, Brazier F, Breban P, Brihier H, Brung-Lefebvre V, Bulois P, Burgiere P, Butel J, Canva JY, Canva-Delcambre V, Capron JP, Cardot F, Carpentier P, Cartier E, Cassar JF, Cassagnou M, Castex JF, Catala P, Cattan S, Catteau S, Caujolle B, Cayron G, Chandelier C, Chantre M, Charles J, Charneau T, Chavance-Thelu M, Chirita D, Choteau A, Claerbout JF, Clergue PY, Coevoet H, Cohen G, Collet R, Colombel JF, Coopman S, Corvisart J, Cortot A, Couttenier F, Crinquette JF, Crombe V, Dadamessi I, Dapvril V, Davion T, Dautreme S, Debas J, Degrave N, Dehont F, Delatre C, Delcenserie R, Delette O, Delgrange T, Delhoustal L, Delmotte JS, Demmane S, Deregnaucourt G, Descombes P, Desechalliers JP, Desmet P, Desreumaux P, Desseaux G, Desurmont P, Devienne A, Devouge E, Devred M, Devroux A, Dewailly A, Dharancy S, Di Fiore A, Djeddi D, Djedir R, Dreher-Duwat ML, Dubois R, Dubuque C, Ducatillon P, Duclay J, Ducrocq B, Ducrot F, Ducrotté P, Dufilho A, Duhamel C, Dujardin D, Dumant-Forest C, Dupas JL, Dupont F, Duranton Y, Duriez A, El Achkar K, El Farisi M, Elie C, Elie-Legrand MC, Elkhaki A, Eoche M, Evrard D, Evrard JP, Fatome A, Filoche B, Finet L, Flahaut M, Flamme C, Foissey D, Fournier P, Foutrein-Comes MC, Foutrein P, Fremond D, Frere T, Fumery M, Gallet P, Gamblin C, Ganga-Zandzou S, Gerard R, Geslin G, Gheyssens Y, Ghossini N, Ghrib S, Gilbert T, Gillet B, Godard D, Godard P, Godchaux JM, Godchaux R, Goegebeur G, Goria O, Gottrand F, Gower P, Grandmaison B, Groux M, Guedon C, Guillard JF, Guillem L, Guillemot F, Guimber D, Haddouche B, Hakim S, Hanon D, Hautefeuille V, Heckestweiller P, Hecquet G, Hedde JP, Hellal H, Henneresse PE, Heyman B, Heraud M, Herve S, Hochain P, Houssin-Bailly L, Houcke P, Huguenin B, Iobagiu S, Ivanovic A, Iwanicki-Caron I, Janicki E, Jarry M, Jeu J, Joly JP, Jonas C, Katherin F, Kerleveo A, Khachfe A, Kiriakos A, Kiriakos J, Klein O, Kohut M, Kornhauser R, Koutsomanis D, Laberenne JE, Laffineur G, Lagarde M, Lannoy P, Lapchin J, Lapprand M, Laude D, Leblanc R, Lecieux P, Leclerc N, Le Couteulx C, Ledent J, Lefebvre J, Lefiliatre P, Legrand C, Le Grix A, Lelong P, Leluyer B, Lenaerts C, Lepileur L, Leplat A, Lepoutre-Dujardin E, Leroi H, Leroy MY, Lesage JP, Lesage X, Lesage J, Lescanne-Darchis I, Lescut J, Lescut D, Leurent B, Levy P, Lhermie M, Lion A, Lisambert B, Loire F, Louf S, Louvet A, Luciani M, Lucidarme D, Lugand J, Macaigne O, Maetz D, Maillard D, Mancheron H, Manolache O, Marks-Brunel AB, Marti R, Martin F, Martin G, Marzloff E, Mathurin P, Mauillon J, Maunoury V, Maupas JL, Mesnard B, Metayer P, Methari L, Meurisse B, Meurisse F, Michaud L, Mirmaran X, Modaine P, Monthe A, Morel L, Mortier PE, Moulin E, Mouterde O, Mudry J, Nachury M, N’Guyen Khac E, Notteghem B, Ollevier V, Ostyn A, Ouraghi A, Ouvry D, Paillot B, Panien-Claudot N, Paoletti C, Papazian A, Parent B, Pariente B, Paris JC, Patrier P, Paupart L, Pauwels B, Pauwels M, Petit R, Piat M, Piotte S, Plane C, Plouvier B, Pollet E, Pommelet P, Pop D, Pordes C, Pouchain G, Prades P, Prevost A, Prevost JC, Quesnel B, Queuniet AM, Quinton JF, Rabache A, Rabelle P, Raclot G, Ratajczyk S, Rault D, Razemon V, Reix N, Revillon M, Richez C, Robinson P, Rodriguez J, Roger J, Roux JM, Rudelli A, Saber A, Savoye G, Schlosseberg P, Segrestin M, Seguy D, Serin M, Seryer A, Sevenet F, Shekh N, Silvie J, Simon V, Spyckerelle C, Talbodec N, Techy A, Thelu JL, Thevenin A, Thiebault H, Thomas J, Thorel JM, Tielman G, Tode M, Toisin J, Tonnel J, Touchais JY, Touze Y, Tranvouez JL, Triplet C, Turck D, Uhlen S, Vaillant E, Valmage C, Vanco D, Vandamme H, Vanderbecq E, Vander Eecken E, Vandermolen P, Vandevenne P, Vandeville L, Vandewalle A, Vandewalle C, Vaneslander P, Vanhoove JP, Vanrenterghem A, Varlet P, Vasies I, Verbiese G, Vernier-Massouille G, Vermelle P, Verne C, Vezilier-Cocq P, Vigneron B, Vincendet M, Viot J, Voiment YM, Wacrenier A, Waeghemaecker L, Wallez JY, Wantiez M, Wartel F, Weber J, Willocquet JL, Wizla N, Wolschies E, Zalar A, Zaouri B, Zellweger A, Ziade C. Extra-intestinal Manifestations at Diagnosis in Paediatric- and Elderly-onset Ulcerative Colitis are Associated With a More Severe Disease Outcome: A Population-based Study. J Crohns Colitis 2017; 11:1326-1334. [PMID: 28981648 DOI: 10.1093/ecco-jcc/jjx092] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 07/05/2017] [Indexed: 02/08/2023]
Abstract
BACKGROUND AND AIMS Data on extra-intestinal manifestations [EIM] and their impact on the disease course of ulcerative colitis [UC] in population-based cohorts are scarce, particularly in paediatric- and elderly-onset UC patients. The aims of this population-based study were to assess: 1] the occurrence of EIM in paediatric- and elderly-onset UC; 2] the factors associated with EIM; and 3] their impact on long-term disease outcome. METHODS Paediatric-onset [< 17 years at diagnosis] and elderly-onset UC patients [> 60 years at diagnosis] from a French prospective population-based registry [EPIMAD] were included. Data on EIM and other clinical factors at diagnosis and at maximal follow-up were collected. RESULTS In all, 158 paediatric- and 470 elderly-onset patients were included [median age at diagnosis 14.5 and 68.8 years, median follow-up 11.2 and 6.2 years, respectively]. EIM occurred in 8.9% of childhood- and 3% of elderly-onset patients at diagnosis and in 16.7% and 2.2% of individuals during follow-up [p < 0.01], respectively. The most frequent EIM was joint involvement [15.8% of paediatric onset and 2.6% of elderly-onset]. Presence of EIM at diagnosis was associated with more severe disease course [need for immunosuppressants or biologic therapy or colectomy] in both paediatric- and elderly-onset UC (hazard ratio [HR] = 2.0, 95% confidence interval [CI]: 1.0-4.2; and HR = 2.8, 0.9-7.9, respectively). Extensive colitis was another independent risk factor in both age groups. CONCLUSIONS Elderly-onset UC patients had lower risk of EIM either at diagnosis or during follow-up than paediatric-onset individuals. EIM at diagnosis predicted more severe disease outcome, including need for immunosuppressive or biologic therapy or surgery, in both paediatric- and elderly-onset UC.
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Affiliation(s)
- Dana Duricova
- Public Health, Epidemiology and Economic Health, Registre EPIMAD, Lille University and Hospital, Lille, France
| | - Ariane Leroyer
- Public Health, Epidemiology and Economic Health, Registre EPIMAD, Lille University and Hospital, Lille, France
| | - Guillaume Savoye
- Gastroenterology Unit, EPIMAD Registry, Rouen University Hospital, Rouen, France
| | - Hélène Sarter
- Public Health, Epidemiology and Economic Health, Registre EPIMAD, Lille University and Hospital, Lille, France.,Lille Inflammation Research International Center LIRIC-UMR 995 Inserm Lille 2 University, Lille, France
| | - Benjamin Pariente
- Gastroenterology Unit, Hôpital Huriez, Lille University Hospital, Lille, France
| | - Djamila Aoucheta
- Associated Medical Director, Immunology, MSD France, Courbevoie cedex, France
| | | | - Delphine Ley
- Lille Inflammation Research International Center LIRIC-UMR 995 Inserm Lille 2 University, Lille, France.,Division of Gastroenterology, Hepatology and Nutrition, Lille University Jeanne de Flandre Children's Hospital, University of Lille, Lille, France
| | - Dominique Turck
- Lille Inflammation Research International Center LIRIC-UMR 995 Inserm Lille 2 University, Lille, France.,Division of Gastroenterology, Hepatology and Nutrition, Lille University Jeanne de Flandre Children's Hospital, University of Lille, Lille, France
| | | | - Corinne Gower-Rousseau
- Public Health, Epidemiology and Economic Health, Registre EPIMAD, Lille University and Hospital, Lille, France.,Lille Inflammation Research International Center LIRIC-UMR 995 Inserm Lille 2 University, Lille, France
| | - Mathurin Fumery
- Lille Inflammation Research International Center LIRIC-UMR 995 Inserm Lille 2 University, Lille, France.,Gastroenterology Unit, EPIMAD Registry, Amiens University Hospital, Amiens, France
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Gilman AR, Buckett W, Son WY, Lefebvre J, Mahfoudh AM, Dahan MH. The relationship between fat and progesterone, estradiol, and chorionic gonadotropin levels in Quebec cow's milk. J Assist Reprod Genet 2017; 34:1567-1569. [PMID: 28840413 DOI: 10.1007/s10815-017-1025-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 08/11/2017] [Indexed: 11/27/2022] Open
Abstract
PURPOSE The majority of milk in industrialized countries is obtained from pregnant cows, which contains increased levels of estrogen and progesterone compared to non-pregnant cows. The aim of this study was to quantify the amount of hormones present in milk with different fat content because previous studies on humans have shown potential effects of increased milk consumption on serum and urine hormone levels as well as on sperm parameters. However, it is unclear whether consumption of milk at the currently recommended levels would lead to systemic effects. METHODS Samples of cow's milk of varying fat concentrations (0, 1, 2, 3.25, 10, and 35%) were analyzed via competitive ELISA assays. RESULTS Progesterone concentrations were significantly correlated to increasing fat content of milk (r = 0.8251, p = 0.04). CONCLUSIONS Research on conditions in which additional progesterone may have an effect on human health should consider inclusion of limitation of milk intake and its effects. Further studies are needed to determine the concentration of progesterone in milk of different fat content in other regions and countries and to quantify the potential pathophysiologic role.
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Affiliation(s)
- A R Gilman
- MUHC Reproductive Centre, Department of Obstetrics and Gynecology, 888 Boul de Maisonneuve E #200, Montreal, Quebec, H2L 4S8, Canada.
| | - W Buckett
- MUHC Reproductive Centre, Department of Obstetrics and Gynecology, 888 Boul de Maisonneuve E #200, Montreal, Quebec, H2L 4S8, Canada
| | - W Y Son
- MUHC Reproductive Centre, Department of Obstetrics and Gynecology, 888 Boul de Maisonneuve E #200, Montreal, Quebec, H2L 4S8, Canada
| | - J Lefebvre
- MUHC Reproductive Centre, Department of Obstetrics and Gynecology, 888 Boul de Maisonneuve E #200, Montreal, Quebec, H2L 4S8, Canada
| | - A M Mahfoudh
- MUHC Reproductive Centre, Department of Obstetrics and Gynecology, 888 Boul de Maisonneuve E #200, Montreal, Quebec, H2L 4S8, Canada
| | - M H Dahan
- MUHC Reproductive Centre, Department of Obstetrics and Gynecology, 888 Boul de Maisonneuve E #200, Montreal, Quebec, H2L 4S8, Canada
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Renard D, Axelos MAV, Boué F, Lefebvre J. Small angle neutron scattering and viscoelasticity study of the colloidal structure of aqueous solutions and gels of a globular protein. ACTA ACUST UNITED AC 2017. [DOI: 10.1051/jcp/1996930998] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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10
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Hattou L, Morandi X, Lefebvre J, Le Reste PJ, Riffaud L, Hénaux PL. Anterior cervical interbody fusion using polyetheretherketone cage filled with synthetic bone graft in acute cervical spine injury. Orthop Traumatol Surg Res 2017; 103:61-66. [PMID: 27720376 DOI: 10.1016/j.otsr.2016.09.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 07/12/2016] [Accepted: 09/14/2016] [Indexed: 02/02/2023]
Abstract
PURPOSE The aim of this study was to assess the interbody fusion rate for patients treated by anterior cervical interbody fusion (ACIF) using polyetheretherketone (PEEK) cages filled with synthetic bone graft in acute cervical spine injury. MATERIALS AND METHODS Twenty-nine patients (mean age: 49 years) with monosegmental instability due to cervical spine injury were followed. We assessed the rate of and time to interbody fusion at 1-year follow-up. In case of secondary displacement, we analysed its causes and surgical management. RESULTS The rate of fusion was 86.2%. The mean time to fusion was 7.2 months. Interbody fusion was observed at 3 months in 4 patients, at 6 months in 14 and at 1 year in 7. Four patients had secondary displacement within 3 months. CONCLUSION ACIF with a PEEK cage filled with synthetic bone graft seems to be an alternative to iliac crest bone graft with no morbidity related to the harvest site.
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Affiliation(s)
- L Hattou
- Department of neurosurgery, Rennes university hospital, CHU Pontchaillou, 2, rue Henri-Le-Guilloux, 35033 Rennes cedex 9, France
| | - X Morandi
- Department of neurosurgery, Rennes university hospital, CHU Pontchaillou, 2, rue Henri-Le-Guilloux, 35033 Rennes cedex 9, France
| | - J Lefebvre
- Department of neurosurgery, Rennes university hospital, CHU Pontchaillou, 2, rue Henri-Le-Guilloux, 35033 Rennes cedex 9, France
| | - P-J Le Reste
- Department of neurosurgery, Rennes university hospital, CHU Pontchaillou, 2, rue Henri-Le-Guilloux, 35033 Rennes cedex 9, France
| | - L Riffaud
- Department of neurosurgery, Rennes university hospital, CHU Pontchaillou, 2, rue Henri-Le-Guilloux, 35033 Rennes cedex 9, France
| | - P-L Hénaux
- Department of neurosurgery, Rennes university hospital, CHU Pontchaillou, 2, rue Henri-Le-Guilloux, 35033 Rennes cedex 9, France.
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11
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Lefebvre J, Buffet-Bataillon S, Henaux P, Riffaud L, Morandi X, Haegelen C. Staphylococcus aureus screening and decolonization reduces the risk of surgical site infections in patients undergoing deep brain stimulation surgery. J Hosp Infect 2017; 95:144-147. [DOI: 10.1016/j.jhin.2016.11.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 11/29/2016] [Indexed: 10/20/2022]
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12
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Boudart D, Ozanne P, Lefebvre J, Lucas J. Is the increase in glycosylated hemoglobin (HbA1) responsible for the erythrocyte deformability decrease in diabetics?1. Clin Hemorheol Microcirc 2016. [DOI: 10.3233/ch-1983-3105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- D. Boudart
- Centre de Transfusion Sanguine, 44000 Nantes, France
| | - P. Ozanne
- Clinique Médicale B, 44000 Nantes, France
| | - J. Lefebvre
- I.N.R.A, Laboratoire de Biochimie des Protéines, 44000 Nantes, France
| | - J.C. Lucas
- Centre de Transfusion Sanguine, 44000 Nantes, France
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13
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Lefebvre J, Bajohr S, Kolb T. CO 2Methanation in a Slurry Bubble Column Reactor - Influence of the Liquid Phase on the Reaction Kinetics and Reactor Design. CHEM-ING-TECH 2016. [DOI: 10.1002/cite.201650028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Abstract
Combustibility of polyurethane foam is an important industry issue. Many test methods are in place to characterize foam combustion, and legislation exists to ensure that the foam complies with specified standards. This paper provides a basic understanding of foam combustibility based on the British Standard BS5852 test method. Dynamic weight loss of foams made with two types of liquid flame retardants with and without melamine is used to provide this understanding. Thermogravimetric analysis and cone calorimeter have been used to support the discussions. In melamine free foams, our study has shown that the decomposition temperature of the liquid flame retardant is a key parameter, which governs the foam combustion. In the melamine containing foams, the overall combustion behavior is independent of the type of liquid flame retardant used. However, intrinsic differences do exist, and synergy is seen between melamine and liquid flame retardant under specific conditions. Applying this basic understanding and the actual combustion standards, foam producers can attain flexibility in designing cost effective foam formulations.
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Affiliation(s)
| | - R. Paleja
- Shell Chemicals, Monnet Centre International Laboratories Avenue Jean-Monnet, 1, B1348 Ottignies Louvain-la-Neuve, Belgium
| | - J. Lefebvre
- Laboratory PERF (Procédés d'Elaboration de Revêtements Fonctionnels) UPRES EA, 1040, E.N.S.C.L Cité Scientifique 59652 Villeneuve d'Ascq, France
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El Hachem H, Lefebvre J, Antaki R, Sylvestre C, Bissonnette F, Phillips S, Dean N, Benoit J, Lapensee L. Controlled Ovarian Stimulation (COS) with 450 IU/day vs 600 IU/day in poor responders: a secondary analysis according to the Bologna criteria. Fertil Steril 2015. [DOI: 10.1016/j.fertnstert.2015.07.157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Sakadzic S, Mandeville E, Gagnon L, Musacchia J, Yaseen M, Yucel M, Lefebvre J, Lesage F, Dale A, Eikermann‐Haerter K, Ayata C, Srinivasan V, Lo E, Devor A, Boas D. Large Arteriolar Component of Oxygen Delivery Implies Safe Margin of Oxygen Supply to Cerebral Tissue. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.794.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sava Sakadzic
- Radiology Massachusetts General HospitalUnited States
| | - Emiri Mandeville
- Radiology Massachusetts General HospitalUnited States
- Department of NeurologyMassachusetts General HospitalUnited States
| | - Louis Gagnon
- Radiology Massachusetts General HospitalUnited States
| | | | | | - Meryem Yucel
- Radiology Massachusetts General HospitalUnited States
| | - Joel Lefebvre
- Département de génie électrique ÉcolePolytechnique de MontréalCanada
| | - Frederic Lesage
- Département de génie électrique ÉcolePolytechnique de MontréalCanada
| | - Anders Dale
- Departments of Radiology and NeurosciencesUniversity of California San DiegoUnited States
| | | | - Cenk Ayata
- Radiology Massachusetts General HospitalUnited States
- Department of NeurologyMassachusetts General HospitalUnited States
| | - Vivek Srinivasan
- Radiology Massachusetts General HospitalUnited States
- Department of Biomedical EngineeringUniversity of CaliforniaDavisUnited States
| | - Eng Lo
- Radiology Massachusetts General HospitalUnited States
- Department of NeurologyMassachusetts General HospitalUnited States
| | - Anna Devor
- Radiology Massachusetts General HospitalUnited States
- Departments of Radiology and NeurosciencesUniversity of California San DiegoUnited States
| | - David Boas
- Radiology Massachusetts General HospitalUnited States
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Carpentier P, Zieliński P, Lefebvre J, Jakubas R. Phenomenological analysis of the phase transitions sequence in the ferroelectric crystal (CH3NH3)5Bi2Cl11 (PMACB). ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s002570050305] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Thieffry S, Lefebvre J, Lepintre MJ, Faure C, Masselin MS. CONTRIBUTION A L'ETUDE RADIOLOGIQUE DES MALFORMATIONS DU PLAN SAGITTAL INTERHEMISPHERIQUE A PROPOS DE 45 OBSERVATIONS. Acta Radiol 2013. [DOI: 10.1177/028418515805000132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Lefebvre J, Guy E, Metzger J. EVOLUTION DES SIGNES RADIOGRAPHIQUES DES ATROPHIES CEREBRALES UNILATERALES. Acta Radiol 2013. [DOI: 10.1177/028418515304000224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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20
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Lefebvre J, Muharram G, Leroy C, Kherrouche Z, Montagne R, Ichim G, Tauszig-Delamasure S, Chotteau-Lelievre A, Brenner C, Mehlen P, Tulasne D. Caspase-generated fragment of the Met receptor favors apoptosis via the intrinsic pathway independently of its tyrosine kinase activity. Cell Death Dis 2013; 4:e871. [PMID: 24136235 PMCID: PMC3824686 DOI: 10.1038/cddis.2013.377] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Revised: 07/25/2013] [Accepted: 08/12/2013] [Indexed: 01/01/2023]
Abstract
The receptor tyrosine kinase Met and its ligand, the hepatocyte growth factor, are essential to embryonic development, whereas the deregulation of Met signaling is associated with tumorigenesis. While ligand-activated Met promotes survival, caspase-dependent generation of the p40 Met fragment leads to apoptosis induction - hallmark of the dependence receptor. Although the survival signaling pathways induced by Met are well described, the pro-apoptotic signaling pathways are unknown. We show that, although p40 Met contains the entire kinase domain, it accelerates apoptosis independently of kinase activity. In cell cultures undergoing apoptosis, the fragment shows a mitochondrial localization, required for p40 Met-induced cell death. Fulminant hepatic failure induced in mice leads to the generation of p40 Met localized also in the mitochondria, demonstrating caspase cleavage of Met in vivo. According to its localization, the fragment induces mitochondrial permeabilization, which is inhibited by Bak silencing and Bcl-xL overexpression. Moreover, Met silencing delays mitochondrial permeabilization induced by an apoptotic treatment. Thus, the Met-dependence receptor in addition to its well-known role in survival signaling mediated by its kinase activity, also participates in the intrinsic apoptosis pathway through the generation of p40 Met - a caspase-dependent fragment of Met implicated in the mitochondrial permeabilization process.
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Affiliation(s)
- J Lefebvre
- CNRS UMR 8161, Institut de Biologie de Lille - Institut Pasteur de Lille-IFR 142 - Université de Lille 1-Université de Lille 2, Lille, France
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Lefebvre J, Klein MR, Lepintre J, Faure G. ETUDE RADIOLOGIQUE DES TUMEURS MEDULLAIRES CHEZ L'ENFANT. Acta Radiol 2013. [DOI: 10.1177/028418515604600107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Lacourcière Y, Poirier L, Lefebvre J, Provencher P, Arnott W. Comparative Effects of a New Cardioselective Beta-Blocker Nebivolol and Nifedipine Sustained-Release on 24-Hour Ambulatory Blood Pressure and Plasma Lipoproteins. J Clin Pharmacol 2013; 32:660-6. [PMID: 1353507 DOI: 10.1002/j.1552-4604.1992.tb05778.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This double-blind, parallel-group study compared the effects of nebivolol, a novel cardioselective beta-blocker, with those of nifedipine sustained-release on 24-hour ambulatory blood pressure and plasma lipoprotein levels. After a washout period of 8 weeks, 51 patients with mild to moderate essential hypertension were randomized to double-blind treatment with either nebivolol 5 mg once a day (n = 26) or nifedipine sustained-release 20 mg bid (n = 25) over a period of 12 weeks. Both treatments produced similar and significant (P = .0001) reduction in office blood pressure as well as in 24-hour, work, awake, and sleep ambulatory blood pressure. The clinical response (diastolic blood pressure less than 90 mmHg or decreased by greater than or equal to 10 mmHg) rate was 69% for nebivolol and 59% for nifedipine, respectively. Moreover, the nebivolol and nifedipine treatment-induced decreases in mean 24-hour ambulatory blood pressure were similar to the decreases in clinic blood pressure. Furthermore, the percentages of "blood pressure loads" (awake greater than 140/90 mmHg and asleep greater than 120/80 mmHg) were lowered significantly (P = .0001), from 60% to 29% with nebivolol and from 60% to 39% with nifedipine. Mean ambulatory heart rate was reduced (P = .0001) from 79 +/- 7 to 68 +/- 7 beats/minute during nebivolol therapy and from 80 +/- 9 to 79 +/- 7 (not significant) with nifedipine. Total plasma cholesterol and low-density lipoprotein levels decreased significantly (P less than .05) by 5 and 8%, respectively, after nebivolol treatment, and each decreased by 3% after nifedipine treatment.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- Y Lacourcière
- Hypertension Unit, Centre Hospitalier Université Laval, Québec, Canada
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Abstract
E-cadherins are homophilic adhesion molecules the expression of which is tightly linked to the invasiveness and the differentiated state of the cells. E-cadherin expression seems also inversely related to the expression of vimentin, an intermediate filament implicated in the metastatic potential of some cells. In breast tumor cells MCF-7, we have previously shown that calcium influences cell growth and promotes cell differentiation. In view of the importance of cell adhesion mechanisms in cell growth and invasion, we sought to determine whether calcium affects the regulation of E-cadherin expression and modifies the relationship between E-cadherin and vimentin expression. To address this question, cells were grown at low (0.04 mM) or high (2.5 mM) concentration of calcium and cadherin and vimentin expression was assessed by flow cytometry analyses. Our results show that calcium enhances cadherin expression in cadherin positive cells and decreases vimentin expression in these cells; in cadherin negative cells, calcium only decreases the expression of vimentin. The modifications of E-cadherin and/or vimentin expression suggests that drugs that can modify intracellular calcium may contribute to overcoming the progression of breast tumor cells toward increasingly malignant phenotypes.
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Affiliation(s)
- B Vandewalle
- CTR OSCAR LAMBRET,HEMATOL LAB,F-59020 LILLE,FRANCE
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Lefebvre J, Demers S, Bujold E, Nicolaides KH, Girard M, Brassard N, Audibert F. Comparison of two different sites of measurement for transabdominal uterine artery Doppler velocimetry at 11-13 weeks. Ultrasound Obstet Gynecol 2012; 40:288-292. [PMID: 22331567 DOI: 10.1002/uog.11137] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/02/2012] [Indexed: 05/31/2023]
Abstract
OBJECTIVES To compare the feasibility of two transabdominal approaches for performing first-trimester uterine artery (UtA) Doppler and to evaluate the correlation with pulsatility index (PI) in the second trimester. METHODS This was a prospective longitudinal Doppler study of the uterine arteries at 11-13 and 21-22 weeks' gestation. Transabdominal ultrasound and color Doppler were used to measure the UtA-PI of the ascending branch of the uterine artery at the level of the internal cervical os (Site A) and at the level of the apparent crossover with the external iliac artery (Site B) at 11-13 weeks, and at Site B only at 21-22 weeks. In all cases the measured left and right PI were converted to a multiple of the median (MoM) for gestational age, and the intercorrelation between the measurements at different sites and gestational ages was calculated using non-parametric analysis (Spearman's rank correlation). RESULTS Satisfactory measurements were obtained at 11-13 weeks from both uterine arteries in all 81 women at Site A and in 50 (62%; 95% CI, 50-72%) at Site B (P < 0.01). Measurements were obtained at Site B at 21-22 weeks in all cases. In the 50 cases with measurements from both sites at 11-13 weeks, the correlation of PI-MoMs between Sites A and B at 11-13 weeks was only moderate (ρ = 0.61). The correlation between first-trimester UtA-PI MoMs at Site A and second-trimester UtA-PI MoMs was stronger than that between first-trimester UtA-PI MoMs at Site B and second-trimester UtA-PI MoMs (ρ = 0.73 vs ρ = 0.47, P < 0.01). CONCLUSION Evaluation of UtA-PI at 11-13 weeks can be achieved at the level of the internal cervical os in a greater proportion of women than at the level of the apparent crossover with the external iliac vessels, and the measurements obtained correlate better with second-trimester UtA-PI.
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Affiliation(s)
- J Lefebvre
- Department of Obstetrics and Gynecology, Faculty of Medicine, Université Laval, Quebec City, QC, Canada
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Baraghis E, Bolduc V, Lefebvre J, Srinivasan VJ, Boudoux C, Thorin E, Lesage F. Measurement of cerebral microvascular compliance in a model of atherosclerosis with optical coherence tomography. Biomed Opt Express 2011; 2:3079-3093. [PMID: 22076269 PMCID: PMC3207377 DOI: 10.1364/boe.2.003079] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2011] [Revised: 10/04/2011] [Accepted: 10/04/2011] [Indexed: 05/31/2023]
Abstract
Optical coherence tomography (OCT) has recently been used to produce 3D angiography of microvasculature and blood flow maps of large vessels in the rodent brain in-vivo. However, use of this optical method for the study of cerebrovascular disease has not been fully explored. Recent developments in neurodegenerative diseases has linked common cardiovascular risk factors to neurodegenerative risk factors hinting at a vascular hypothesis for the development of the latter. Tools for studying cerebral blood flow and the myogenic tone of cerebral vasculature have thus far been either highly invasive or required ex-vivo preparations therefore not preserving the delicate in-vivo conditions. We propose a novel technique for reconstructing the flow profile over a single cardiac cycle in order to evaluate flow pulsatility and vessel compliance. A vascular model is used to simulate changes in vascular compliance and interpret OCT results. Comparison between atherosclerotic and wild type mice show a trend towards increased compliance in the smaller arterioles of the brain (diameter < 80μm) in the disease model. These results are consistent with previously published ex-vivo work confirming the ability of OCT to investigate vascular dysfunction.
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Affiliation(s)
- E. Baraghis
- Ecole Polytechnique Montreal, 2500 Chemin de Polytechnique, Montreal, Qc, H3C 3A7,
Canada
| | - V. Bolduc
- Research Center, Montreal Heart Institute, 5000 Belanger Est, Montreal, Qc, H3T 1J4,
Canada
| | - J. Lefebvre
- Ecole Polytechnique Montreal, 2500 Chemin de Polytechnique, Montreal, Qc, H3C 3A7,
Canada
| | - V. J. Srinivasan
- Optics Division, MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital/Harvard Medical School, Charlestown, MA 02129,
USA
| | - C. Boudoux
- Ecole Polytechnique Montreal, 2500 Chemin de Polytechnique, Montreal, Qc, H3C 3A7,
Canada
| | - E. Thorin
- Research Center, Montreal Heart Institute, 5000 Belanger Est, Montreal, Qc, H3T 1J4,
Canada
| | - F. Lesage
- Ecole Polytechnique Montreal, 2500 Chemin de Polytechnique, Montreal, Qc, H3C 3A7,
Canada
- Research Center, Montreal Heart Institute, 5000 Belanger Est, Montreal, Qc, H3T 1J4,
Canada
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Lefebvre J, Lake J, Pham E, Leemans C. 8607 POSTER Patient-reported Experiences and Needs – Findings From the About Face 2 Survey of Patients With Locally Advanced SCCHN. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)72249-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Lefebvre J, Pointreau Y, Rolland F, Alfonsi M, Baudoux A, Sire C, De Raucourt D, Bardet E, Tuchais C, Garaud P, Calais G. Sequential chemoradiotherapy (SCRT) for larynx preservation (LP): Results of the randomized phase II TREMPLIN study. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.5501] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Abstract
We present a detailed study of the parameters which affect the geometrical perfection of nanopyramids used for the site-selected nucleation of quantum dots. Through an understanding of crystal facet formation, we demonstrate that undesirable high index planes can be suppressed using carefully optimized lithography together with properly orientated source fluxes in the growth reactor. High quality InP nanopyramids are reported with individual InAs/InP quantum dots positioned with high precision. This represents an important milestone for the fabrication of complex quantum dot based nanophotonic devices.
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Affiliation(s)
- P J Poole
- Institute for Microstructural Sciences, National Research Council, Ottawa, ON, K1A 0R6, Canada.
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Merlano MC, Vermorken JB, Wilke H, Bourhis J, Mesia R, Guigay J, Keilholz U, Hartmann M, Lefebvre J. First-line treatment patterns for recurrent and/or metastatic head and neck cancer (R/M HNC) in Europe. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e16016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Lefebvre J, Longtin A, Leblanc VG. Oscillatory response in a sensory network of ON and OFF cells with instantaneous and delayed recurrent connections. Philos Trans A Math Phys Eng Sci 2010; 368:455-467. [PMID: 20008411 DOI: 10.1098/rsta.2009.0229] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A neural field model with multiple cell-to-cell feedback connections is investigated. Our model incorporates populations of ON and OFF cells, receiving sensory inputs with direct and inverted polarity, respectively. Oscillatory responses to spatially localized stimuli are found to occur via Andronov-Hopf bifurcations of stationary activity. We explore the impact of multiple delayed feedback components as well as additional excitatory and/or inhibitory non-delayed recurrent signals on the instability threshold. Paradoxically, instantaneous excitatory recurrent terms are found to enhance network responsiveness by reducing the oscillatory response threshold, allowing smaller inputs to trigger oscillatory activity. Instantaneous inhibitory components do the opposite. The frequency of these response oscillations is further shaped by the polarity of the non-delayed terms.
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Affiliation(s)
- J Lefebvre
- Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5, Canada.
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Vinten P, Marshall P, Lefebvre J, Finnie P. Distinct termination morphologies for vertically aligned carbon nanotube forests. Nanotechnology 2010; 21:035603. [PMID: 19966390 DOI: 10.1088/0957-4484/21/3/035603] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Vertically aligned carbon nanotube forests, including single-walled nanotubes, are imaged optically as they grow in situ from cobalt/alumina catalyst using water-assisted acetylene chemical vapor deposition. Three distinct termination morphologies are identified and investigated optically and via scanning electron microscopy. Quantitative growth dynamics are extracted and show gradual deceleration and sudden termination of growth. The termination morphology is discussed in terms of the balance of forces within the forest. We speculate that sudden termination is a collective effect arising from an imbalance in these forces.
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Affiliation(s)
- P Vinten
- Institute for Microstructural Sciences, National Research Council Canada, Ottawa, ON, Canada
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Levie P, Horoi M, Claes J, Monnoye JP, Verheyden PJ, Monnoye V, Lefebvre J, Millet B, Dartevelle D, Lemaire FX, Hatert AS, de Burbure C. External or internal lateral osteotomy: why I choose the external percutaneous approach. B-ENT 2010; 6 Suppl 15:49-50. [PMID: 21305924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023] Open
Abstract
The authors present their surgical experience with the management of patients with dorsum deformities using a precise technique: the external percutaneous approach. The indications for this technique have still not been set out very clearly in the rhinological textbooks or manuals, and so novices (and not only novices) have difficulty in understanding and applying it. We therefore try to systematise and clarify these indications in brief, together with the technical details, providing a comparison with another technique that is in very widespread use at present: the internal lateral osteotomy. Although the external percutaneous approach is not used very often--in our experience in 30% of cases only--we find the results very satisfactory and we recommend it when it is required by the anatomic conditions.
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Affiliation(s)
- P Levie
- Ste Anne-St Remi Hospital, Brussels, Belgium.
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Léveillée S, Lefebvre J, Marleau JD. Profil psychosocial des familicides commis au Québec – 1986 à 2000. Annales Médico-psychologiques, revue psychiatrique 2009. [DOI: 10.1016/j.amp.2007.05.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Lefebvre J, Hilke M, Altounian Z. Strengthening of reentrant pinning by collective interactions in the peak effect. Phys Rev Lett 2009; 102:257002. [PMID: 19659112 DOI: 10.1103/physrevlett.102.257002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Indexed: 05/28/2023]
Abstract
Since it was first observed about 40 years ago [A. B. Pippard, Proc. R. Soc. A 216, 547 (1953)10.1098/rspa.1953.0040], the peak effect has been the subject of extensive research mainly impelled by the desire to determine its exact mechanisms. Despite these efforts, a consensus on this question has yet to be reached. Experimentally, the peak effect indicates a transition from a depinned vortex phase to a reentrant pinning phase at a high magnetic field. To study the effects of intrinsic pinning on the peak effect, we consider FexNi1-xZr2 superconducting metallic glasses in which the vortex pinning force varies depending on the Fe content and in which a huge peak effect is seen. The results show that the peak effect broadens with decreasing pinning force. Typically, pinning is increased by pinning centers, but here we show that reentrant pinning is due to the strengthening of interactions and collective effects (while decreasing pinning strength).
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Affiliation(s)
- J Lefebvre
- Department of Physics, McGill University, Montréal, Canada H3A 2T8
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Leemans CR, Lefebvre J, Vermorken JB. A pan-European survey to gauge public awareness and understanding of head and neck cancer and associated risk factors. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.6073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
6073 Background: Head and neck cancer is the sixth most frequently occurring cancer worldwide yet there appears to be little awareness of this disease amongst the general public in Europe. As part of an ongoing program to fully understand the patient perspective, the ‘About Face’ survey was planned and conducted in collaboration with the European Head and Neck Society to gauge current awareness and understanding of head and neck cancer and its associated risk factors. Methods: A total of 7,520 Omnibus internet interviews were conducted in 7 European countries (FR, DE, IT, NL, SP, SW, UK) in September 2008. Results: Only 23% of respondents overall were aware of the term ‘head and neck cancer.’ While most symptoms of head and neck cancer were recognized; the majority were cited correctly by fewer than half of respondents; 60% believed that ‘head and neck cancer’ includes tumors of the brain. Sixty-one percent of those surveyed underestimated the incidence of head and neck cancer in Europe by at least a factor of 10. While the majority recognized the link between head and neck cancer and smoking or high alcohol intake, far fewer were aware of the role of excessive sun exposure or HPV infection in disease etiology. One in four respondents felt that the consequences of surgery would cause the most distress to a person diagnosed with the disease. Conclusions: There is a general lack of knowledge amongst the general public in Europe of the risk factors and symptoms of head and neck cancer. This is a significant issue that should be addressed as these data suggest that patients may be more likely to delay consulting a physician and therefore be diagnosed with this difficult-to-treat disease at a late stage. Further education of the public on head and neck cancer is warranted. [Table: see text]
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Lefebvre J, Pointreau Y, Rolland F, Alfonsi M, Baudoux A, Sire C, de Raucourt D, Bardet E, Tuchais C, Calais G. Sequential chemoradiotherapy (SCRT) for larynx preservation (LP): Preliminary results of the randomized phase II TREMPLIN study. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.6010] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
6010 Background: Induction chemotherapy (ICT) followed by irradiation (RT) and concurrent chemoradiotherapy (CRT) are validated options for LP. Docetaxel-based ICT, concurrent cetuximab and RT are new options and SCRT (ICT followed by CRT) has been reported as a potential new approach. However, to date there are no data assessing SCRT specifically for LP. Methods: Previously untreated patients (pts) with larynx or hypopharynx squamous cell carcinoma and candidates for a total laryngectomy were eligible for this randomized phase II study. Eligible pts received 3 cycles of ICT (docetaxel and cisplatin both 75 mg/m2 on day 1 and 5-FU 750 mg/m2/day on days 1–5). In case of response ≥ 50 % pts were randomized to receive either in arm A: RT (70 Gy) with cisplatin (100 mg/m2 on days 1, 22 and 43 of RT) or in arm B: Cetuximab (400 mg/m2 loading dose before RT and 250 mg/m2 on the first day of the 7 weeks of RT. Pts with response < 50% had salvage surgery. Primary endpoint was LP 3 months after treatment, secondary endpoints were larynx function preservation at 18 months, quality of function and tolerance to treatment. Results: From March 2006 to April 2008 (end of accrual), 153 pts with stage III-IV larynx/hypopharynx cancer were enrolled in the study and could start ICT. Of them 74 % could receive the planned ICT while the others had either reduced dosages or less than 3 cycles. Toxic deaths occurred in 3 pts (2%). Of the 147 evaluable pts after ICT, 22 were non-responders (15%), 4 pts were withdrawn from the study, 6 responding pts with ICT-related toxicity precluding any further cisplatin could not be randomized and finally 115 pts could be randomized (59 in arm A and 56 in arm B). 3 months after treatment there was no significant difference in LP (93% in arm A and 96% in arm B). In arm A, 45 % of pts could receive the full CRT protocol vs 71 % in arm B. In arm A 50% of pts had cisplatin-related toxicity (definitive in 52% the cases) while in arm B 26 % of patients had cetuximab-related toxicity (definitive in only 1 case). There was no CRT treatment-related death. Conclusions: SCRT is considered for LP. ICT followed by RT with concurrent cetuximab appeared better tolerated than with concurrent cisplatin with the same LP rate 3 months after treatment. [Table: see text]
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Affiliation(s)
- J. Lefebvre
- Centre Oscar Lambret, Lille, France; Centre Hospitalier Universitaire, Tours, France; Centre René Gauducheau, Saint-Herblain, France; Institut Sainte Catherine, Avignon, France; Centre Hospitalier Universitaire, Namur, Belgium; Centre Hospitalier Bretagne Sud, Lorient, France; Centre François Baclesse, Caen, France; Centre Paul Papin, Angers, France; Centre Hospitalier Universitaire, Tours, France
| | - Y. Pointreau
- Centre Oscar Lambret, Lille, France; Centre Hospitalier Universitaire, Tours, France; Centre René Gauducheau, Saint-Herblain, France; Institut Sainte Catherine, Avignon, France; Centre Hospitalier Universitaire, Namur, Belgium; Centre Hospitalier Bretagne Sud, Lorient, France; Centre François Baclesse, Caen, France; Centre Paul Papin, Angers, France; Centre Hospitalier Universitaire, Tours, France
| | - F. Rolland
- Centre Oscar Lambret, Lille, France; Centre Hospitalier Universitaire, Tours, France; Centre René Gauducheau, Saint-Herblain, France; Institut Sainte Catherine, Avignon, France; Centre Hospitalier Universitaire, Namur, Belgium; Centre Hospitalier Bretagne Sud, Lorient, France; Centre François Baclesse, Caen, France; Centre Paul Papin, Angers, France; Centre Hospitalier Universitaire, Tours, France
| | - M. Alfonsi
- Centre Oscar Lambret, Lille, France; Centre Hospitalier Universitaire, Tours, France; Centre René Gauducheau, Saint-Herblain, France; Institut Sainte Catherine, Avignon, France; Centre Hospitalier Universitaire, Namur, Belgium; Centre Hospitalier Bretagne Sud, Lorient, France; Centre François Baclesse, Caen, France; Centre Paul Papin, Angers, France; Centre Hospitalier Universitaire, Tours, France
| | - A. Baudoux
- Centre Oscar Lambret, Lille, France; Centre Hospitalier Universitaire, Tours, France; Centre René Gauducheau, Saint-Herblain, France; Institut Sainte Catherine, Avignon, France; Centre Hospitalier Universitaire, Namur, Belgium; Centre Hospitalier Bretagne Sud, Lorient, France; Centre François Baclesse, Caen, France; Centre Paul Papin, Angers, France; Centre Hospitalier Universitaire, Tours, France
| | - C. Sire
- Centre Oscar Lambret, Lille, France; Centre Hospitalier Universitaire, Tours, France; Centre René Gauducheau, Saint-Herblain, France; Institut Sainte Catherine, Avignon, France; Centre Hospitalier Universitaire, Namur, Belgium; Centre Hospitalier Bretagne Sud, Lorient, France; Centre François Baclesse, Caen, France; Centre Paul Papin, Angers, France; Centre Hospitalier Universitaire, Tours, France
| | - D. de Raucourt
- Centre Oscar Lambret, Lille, France; Centre Hospitalier Universitaire, Tours, France; Centre René Gauducheau, Saint-Herblain, France; Institut Sainte Catherine, Avignon, France; Centre Hospitalier Universitaire, Namur, Belgium; Centre Hospitalier Bretagne Sud, Lorient, France; Centre François Baclesse, Caen, France; Centre Paul Papin, Angers, France; Centre Hospitalier Universitaire, Tours, France
| | - E. Bardet
- Centre Oscar Lambret, Lille, France; Centre Hospitalier Universitaire, Tours, France; Centre René Gauducheau, Saint-Herblain, France; Institut Sainte Catherine, Avignon, France; Centre Hospitalier Universitaire, Namur, Belgium; Centre Hospitalier Bretagne Sud, Lorient, France; Centre François Baclesse, Caen, France; Centre Paul Papin, Angers, France; Centre Hospitalier Universitaire, Tours, France
| | - C. Tuchais
- Centre Oscar Lambret, Lille, France; Centre Hospitalier Universitaire, Tours, France; Centre René Gauducheau, Saint-Herblain, France; Institut Sainte Catherine, Avignon, France; Centre Hospitalier Universitaire, Namur, Belgium; Centre Hospitalier Bretagne Sud, Lorient, France; Centre François Baclesse, Caen, France; Centre Paul Papin, Angers, France; Centre Hospitalier Universitaire, Tours, France
| | - G. Calais
- Centre Oscar Lambret, Lille, France; Centre Hospitalier Universitaire, Tours, France; Centre René Gauducheau, Saint-Herblain, France; Institut Sainte Catherine, Avignon, France; Centre Hospitalier Universitaire, Namur, Belgium; Centre Hospitalier Bretagne Sud, Lorient, France; Centre François Baclesse, Caen, France; Centre Paul Papin, Angers, France; Centre Hospitalier Universitaire, Tours, France
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Lefebvre J, Boileau G, Manjunath P. Recombinant expression and affinity purification of a novel epididymal human sperm-binding protein, BSPH1. Mol Hum Reprod 2008; 15:105-14. [DOI: 10.1093/molehr/gan077] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Maingonnat J, Doublier J, Lefebvre J, Delaplace G. Power consumption of a double ribbon impeller with newtonian and shear thinning fluids and during the gelation of a iota-carrageenan solution. J FOOD ENG 2008. [DOI: 10.1016/j.jfoodeng.2007.11.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Lefebvre J, Horiot J, Rolland F, Tesselaar M, Leemans CR, Geoffrois L, Hupperets P, Lacombe D, Bogaerts J, Bernier J. Phase III study on larynx preservation comparing induction chemotherapy and radiotherapy versus alternating chemoradiotherapy in resectable hypopharynx and larynx cancers. EORTC protocol 24954–22950. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.lba6016] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
LBA6016 Background: Final analysis of a larynx preservation study comparing sequential induction chemotherapy and radiotherapy (XRT) versus alternating chemoradiotherapy in treating resectable hypopharynx and larynx cancers. Methods: Patients (pts) with untreated, resectable T3-T4 larynx or T2-T3-T4 hypopharynx, N0-N2, M0 squamous cell carcinoma (SCC) were randomized in this prospective Phase III trial. Pts received in the control arm (SEQ) 2 cycles of cisplatin/5-FU (CF), followed in case of response by 2 additional cycles of CF, followed on day 80 by XRT (70 Gy / 35 fractions / 7 weeks), or in the experimental arm a CF cycle in weeks 1, 4, 7 and 10, alternated with XRT (20 Gy / 10 fractions) during the three 2-week intervals (ALT). Pts had surgery and postoperative XRT in case of non- response. The primary endpoint was survival with a functional larynx (FLS), with events including local relapse, laryngectomy, tracheotomy, gastrostomy, feeding tube, and death. With 450 patients and 3 yrs minimum followup per pt, this trial was planned to provide 80% power to detect a difference of 11% (from 28% to 39%) in this endpoint at 3 years by 2-sided Logrank test (Type I error 5%). Results: The trial enrolled 450 pts (224 to SEQ, 226 to ALT) from July 1996 to May 2004. Median followup is 6.5 years (yrs). 76 pts discontinued treatment for toxicity (34 on SEQ, 42 on ALT). Hazard ratio (HR) for FLS was 0.84 (95% CI 0.67–1.05, p=0.12) with medians 1.6 yrs on SEQ and 2.3 yrs on ALT. OS (medians of 4.4 and 5.2 yrs) and PFS (medians of 3.0 and 3.1 yrs) were similar for SEQ and ALT, respectively. At 3 yrs, cumulative incidence of larynx events was 46% on SEQ and 38% on ALT (HR 0.79, p=0.09). Grade 3/4 mucositis was seen in 32% of pts who received RTX on SEQ, and 21% on ALT. Late severe edema and/or fibrosis was observed in 16% of pts in SEQ and 11% in ALT. Conclusion: A 8% difference in larynx function preservation rate at 3 yrs favoring ALT did not translate into statistically significant differences. ALT, as a form of chemoradiation, did not lead to increased incidence and severity of mucositis. There were no relevant long-term sequelae in either arm. No significant financial relationships to disclose.
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Affiliation(s)
- J. Lefebvre
- Centre Oscar Lambret, Lille, France; Centre Georges-Francois Leclerc, Dijon, France; Centre Rene Gauducheau, Nantes, France; Leiden University Medical Centre, Leiden, The Netherlands; Vrije Universiteit Medisch Centrum, Amsterdam, The Netherlands; Centre Alexis Vautrin, Nancy, France; Academisch Ziekenhuis Maastricht, Maastricht, The Netherlands; EORTC, Brussels, Belgium; Clinique de Genolier, Genolier, Switzerland
| | - J. Horiot
- Centre Oscar Lambret, Lille, France; Centre Georges-Francois Leclerc, Dijon, France; Centre Rene Gauducheau, Nantes, France; Leiden University Medical Centre, Leiden, The Netherlands; Vrije Universiteit Medisch Centrum, Amsterdam, The Netherlands; Centre Alexis Vautrin, Nancy, France; Academisch Ziekenhuis Maastricht, Maastricht, The Netherlands; EORTC, Brussels, Belgium; Clinique de Genolier, Genolier, Switzerland
| | - F. Rolland
- Centre Oscar Lambret, Lille, France; Centre Georges-Francois Leclerc, Dijon, France; Centre Rene Gauducheau, Nantes, France; Leiden University Medical Centre, Leiden, The Netherlands; Vrije Universiteit Medisch Centrum, Amsterdam, The Netherlands; Centre Alexis Vautrin, Nancy, France; Academisch Ziekenhuis Maastricht, Maastricht, The Netherlands; EORTC, Brussels, Belgium; Clinique de Genolier, Genolier, Switzerland
| | - M. Tesselaar
- Centre Oscar Lambret, Lille, France; Centre Georges-Francois Leclerc, Dijon, France; Centre Rene Gauducheau, Nantes, France; Leiden University Medical Centre, Leiden, The Netherlands; Vrije Universiteit Medisch Centrum, Amsterdam, The Netherlands; Centre Alexis Vautrin, Nancy, France; Academisch Ziekenhuis Maastricht, Maastricht, The Netherlands; EORTC, Brussels, Belgium; Clinique de Genolier, Genolier, Switzerland
| | - C. R. Leemans
- Centre Oscar Lambret, Lille, France; Centre Georges-Francois Leclerc, Dijon, France; Centre Rene Gauducheau, Nantes, France; Leiden University Medical Centre, Leiden, The Netherlands; Vrije Universiteit Medisch Centrum, Amsterdam, The Netherlands; Centre Alexis Vautrin, Nancy, France; Academisch Ziekenhuis Maastricht, Maastricht, The Netherlands; EORTC, Brussels, Belgium; Clinique de Genolier, Genolier, Switzerland
| | - L. Geoffrois
- Centre Oscar Lambret, Lille, France; Centre Georges-Francois Leclerc, Dijon, France; Centre Rene Gauducheau, Nantes, France; Leiden University Medical Centre, Leiden, The Netherlands; Vrije Universiteit Medisch Centrum, Amsterdam, The Netherlands; Centre Alexis Vautrin, Nancy, France; Academisch Ziekenhuis Maastricht, Maastricht, The Netherlands; EORTC, Brussels, Belgium; Clinique de Genolier, Genolier, Switzerland
| | - P. Hupperets
- Centre Oscar Lambret, Lille, France; Centre Georges-Francois Leclerc, Dijon, France; Centre Rene Gauducheau, Nantes, France; Leiden University Medical Centre, Leiden, The Netherlands; Vrije Universiteit Medisch Centrum, Amsterdam, The Netherlands; Centre Alexis Vautrin, Nancy, France; Academisch Ziekenhuis Maastricht, Maastricht, The Netherlands; EORTC, Brussels, Belgium; Clinique de Genolier, Genolier, Switzerland
| | - D. Lacombe
- Centre Oscar Lambret, Lille, France; Centre Georges-Francois Leclerc, Dijon, France; Centre Rene Gauducheau, Nantes, France; Leiden University Medical Centre, Leiden, The Netherlands; Vrije Universiteit Medisch Centrum, Amsterdam, The Netherlands; Centre Alexis Vautrin, Nancy, France; Academisch Ziekenhuis Maastricht, Maastricht, The Netherlands; EORTC, Brussels, Belgium; Clinique de Genolier, Genolier, Switzerland
| | - J. Bogaerts
- Centre Oscar Lambret, Lille, France; Centre Georges-Francois Leclerc, Dijon, France; Centre Rene Gauducheau, Nantes, France; Leiden University Medical Centre, Leiden, The Netherlands; Vrije Universiteit Medisch Centrum, Amsterdam, The Netherlands; Centre Alexis Vautrin, Nancy, France; Academisch Ziekenhuis Maastricht, Maastricht, The Netherlands; EORTC, Brussels, Belgium; Clinique de Genolier, Genolier, Switzerland
| | - J. Bernier
- Centre Oscar Lambret, Lille, France; Centre Georges-Francois Leclerc, Dijon, France; Centre Rene Gauducheau, Nantes, France; Leiden University Medical Centre, Leiden, The Netherlands; Vrije Universiteit Medisch Centrum, Amsterdam, The Netherlands; Centre Alexis Vautrin, Nancy, France; Academisch Ziekenhuis Maastricht, Maastricht, The Netherlands; EORTC, Brussels, Belgium; Clinique de Genolier, Genolier, Switzerland
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Lefebvre J, Finnie P. Polarized photoluminescence excitation spectroscopy of single-walled carbon nanotubes. Phys Rev Lett 2007; 98:167406. [PMID: 17501463 DOI: 10.1103/physrevlett.98.167406] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2007] [Indexed: 05/15/2023]
Abstract
The polarized photoluminescence excitation spectra of twenty-five single-walled carbon nanotube species are reported. For light polarized along the nanotube axis, the main absorption resonance at E22 shows sidebands attributed to phonon assisted absorption. Sidebands to E11 have a diameter dependent energy and are assigned to excited excitonic states. Along with longitudinal excitations, several transverse excitations are identified. The transverse E12 resonance has a specific family pattern with energy close to E22. Comparison with theory provides an estimate of the strength of the Coulomb interaction.
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Affiliation(s)
- J Lefebvre
- Institute for Microstructural Sciences, National Research Council, Montreal Road, Ottawa, Ontario, K1A OR6, Canada
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Bond J, Lefebvre J, Austing DG, Tay L, Finnie P. Chemical vapour deposition of single walled carbon nanotubes freely suspended over nanotube supports. Nanotechnology 2007; 18:135603. [PMID: 21730381 DOI: 10.1088/0957-4484/18/13/135603] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Single walled carbon nanotubes (SWNTs) suspended above the substrate can be fabricated simply and rapidly by chemical vapour deposition growth over pre-grown multi-walled carbon nanotubes (MWNTs). SWNTs are suspended either on a randomly organized carbon nanotube network on an unpatterned substrate, or between organized pillars made from vertically aligned nanotube forests on a patterned substrate. All nanotubes are produced during a single growth run using a two step growth technique. This approach enables the fabrication of laterally suspended SWNT networks which are well suited for optical applications.
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Affiliation(s)
- J Bond
- Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, ON, K1N 6N5, Canada
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Lefebvre J, Mahmoudi N. The pattern of the linear viscoelastic behaviour of wheat flour dough as delineated from the effects of water content and high molecular weight glutenin subunits composition. J Cereal Sci 2007. [DOI: 10.1016/j.jcs.2006.06.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kim D, Lefebvre J, Lapointe J, Reimer ME, Mckee J, Poole PJ, Williams RL. Optical spectroscopy of single, planar, self-assembled InAs/InP quantum dots. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pssc.200671559] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Lefebvre J, Fan J, Chevalier S, Sullivan R, Carmona E, Manjunath P. Genomic structure and tissue-specific expression of human and mouse genes encoding homologues of the major bovine seminal plasma proteins. Mol Hum Reprod 2006; 13:45-53. [PMID: 17085770 DOI: 10.1093/molehr/gal098] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Sperm capacitation is a maturation event that takes place in the female reproductive tract and is essential for fertilization. A family of phospholipid-binding proteins present in bovine seminal plasma (BSP proteins) binds the sperm membrane at ejaculation and promotes bovine sperm capacitation. Homologues of these proteins have also been isolated from boar, ram, goat, bison and stallion seminal fluid, suggesting that BSP proteins and their homologues are conserved among mammals. However, there have been no reports on BSP-homologous proteins in mice and humans to date. A search of the mouse and human genomes, using the nucleic acid sequences of BSP proteins, revealed the presence of three BSP-like sequences in the mouse genome, named mouse BSP Homologue 1 (mBSPH1), mBSPH2 and mBSPH3, and one sequence in the human genome (hBSPH1). Mouse epididymal expressed sequence tags corresponding to partial sequences of mBSPH1 and mBSPH2 were identified. The entire complementary DNA (cDNA) sequences of mBSPH1 and mBSPH2 from mouse epididymis and hBSPH1 from human epididymis were obtained by 5'-/3'-rapid amplification of cDNA ends (RACE) and encode predicted proteins containing two tandemly repeated fibronectin type II domains, which is the signature of the BSP family of proteins. Using RT-PCR, it was revealed that mBSPH1, mBSPH2 and hBSPH1 mRNA are expressed only in the epididymis. Expression of mBSPH3 was not detected in any tissue and probably represents a pseudogene. This work shows, for the first time, that BSP homologues are expressed in mouse and human and may be involved in sperm capacitation in these species.
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Affiliation(s)
- J Lefebvre
- Guy-Bernier Research Centre, Maisonneuve-Rosemont Hospital and Department of Medicine, University of Montreal, Montreal, Québec, Canada
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Delord J, Thomas F, Benlyazid A, Sarini J, Rives M, Begue M, Courbon F, Lefebvre J, Rochaix P. Neo-adjuvant treatment with erlotinb in squamous cell carcinoma head and neck (SCCHN) patients before surgery provides an opportunity to find predictive factors of response. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.5513] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
5513 Background: To date, neither immunohistochemistry (IHC) nor molecular analyses have identified prognostic markers of response to epidermal growth factor receptor (EGFR) tyrosine kinase (TK) inhibitors in SCCHN. Thus, the selection of patients who could benefit from such agents remains a challenge. We designed a ‘pilot’ clinical trial of patients (pts) with SCCHN pending first-line surgery of their disease. Methods: Pts with resectable SCCHN received erlotinib at 150mg/day during the period between pan-endoscopy and surgery. Pharmacokinetic (PK) samples were collected during treatment, which ceased the day before surgery. Results: Thirty five pts were recruited. All of them had resectable SCCHN: oral cavity (17 pts), oropharyngeal (7 pts), hypopharyngeal (5 pts), larygeal (6 pts). Thirty pts received full treatment with erlotinib and the main reason for discontinuation was rash. The median duration of treatment was 21 days (14–27). All pts were evaluated clinically and their tumors assessed radiologically before and after treatment. Out of 30 evaluable pts, 8 were considered as good responders (30–80% decrease in tumor size), 18 had stable disease and 2 had minor progression. Expected toxicities were observed: rash (grade 2/3 in 11 pts), diarrhea (grade 2 in 1 pt). All pts underwent surgery. The incidence of post-operative complications was similar to our historical series. No mutations in the catalytic domain of EGFR TK were found. All tumors were positive for EGFR by IHC. Correlative statistical analyses between PK, toxicity and response data are ongoing and will be presented. Neither over expression of EGFR nor other IHC markers alone were found to be good predictive markers of efficacy. Retrospective analysis of morphological and IHC evaluation in some cell cycle regulators (mainly p21) appeared to be predictive of erlotinib efficacy (sensitivity 87.5%, specificity 88%). Conclusions: Neo-adjuvant treatment with erlotinib in SCCHN pts is well-tolerated. This trial demonstrated a useful prospective method to potentially aid patient selection to improve the design of post-operative adjuvant treatment combinations. No significant financial relationships to disclose.
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Affiliation(s)
- J. Delord
- Institut Claudius Régaud, Toulouse, France; Centre Oscar Lambret, Lille, France
| | - F. Thomas
- Institut Claudius Régaud, Toulouse, France; Centre Oscar Lambret, Lille, France
| | - A. Benlyazid
- Institut Claudius Régaud, Toulouse, France; Centre Oscar Lambret, Lille, France
| | - J. Sarini
- Institut Claudius Régaud, Toulouse, France; Centre Oscar Lambret, Lille, France
| | - M. Rives
- Institut Claudius Régaud, Toulouse, France; Centre Oscar Lambret, Lille, France
| | - M. Begue
- Institut Claudius Régaud, Toulouse, France; Centre Oscar Lambret, Lille, France
| | - F. Courbon
- Institut Claudius Régaud, Toulouse, France; Centre Oscar Lambret, Lille, France
| | - J. Lefebvre
- Institut Claudius Régaud, Toulouse, France; Centre Oscar Lambret, Lille, France
| | - P. Rochaix
- Institut Claudius Régaud, Toulouse, France; Centre Oscar Lambret, Lille, France
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