Publications by authors named "Nicolas Gauthier"

Objective: Evaluating long-term outcomes following cementoplasty in patients with multiple myeloma (MM).

Methods: This is a single-center, retrospective study on all cementoplasties performed between January 2012 and December 2017. Patients with MM with a control MRI or CT scan beyond 5 years after the procedure were included.

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JAK (Janus Kinase) inhibitors, such as ruxolitinib, were introduced a decade ago for treatment of myeloproliferative neoplasms (MPN). To evaluate ruxolitinib's impact on MPN clonal evolution, we interrogate a myelofibrosis patient cohort with longitudinal molecular evaluation and discover that ruxolitinib is associated with clonal outgrowth of RAS pathway mutations. Single-cell DNA sequencing combined with ex vivo treatment of RAS mutated CD34 primary patient cells, demonstrates that ruxolitinib induces RAS clonal selection both in a JAK/STAT wild-type and hyper-activated context.

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Introduction: Patients with ischaemic mitral regurgitation (MR) have markedly increased cardiovascular mortality compared with those with primary MR. The sex-based prognosis of patients with ischaemic MR undergoing mitral surgery remains unclear. The goal of this systematic review is to evaluate long-term mortality, reoperation, heart failure rehospitalisation and MR recurrence in women who undergo mitral valve surgery for chronic ischaemic MR, compared with men.

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Introduction: Human Herpesvirus-6 (HHV-6) DNAemia is not rare in intensive care unit (ICU) patients. However, evidence for a causal association of HHV-6 DNAemia with organ disease and with mortality is limited in this setting. In ICU patients with HHV-6 DNAemia, we sought to 1) assess the prevalence of HHV-6 disease, 2) identify risk factors for HHV-6 disease and 3) investigate its association with mortality.

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Hypomethylating agent (HMA) plus venetoclax (VEN) regimens are standard of care in patients with acute myeloid leukemia (AML) ineligible for intensive chemotherapy. While the VEN label recommends continuous 28-day cycles, shortened VEN durations may induce similar response rates and improve tolerability. It is unknown how a VEN exposure reduced to 7 days during cycles compares to standard HMA + VEN.

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Oscillatory signals from coherently excited phonons are regularly observed in ultrafast pump-probe experiments on condensed matter samples. Electron-phonon coupling implies that coherent phonons also modulate the electronic band structure. These oscillations can be probed with energy and momentum resolution using time- and angle-resolved photoemission spectroscopy (trARPES), which reveals the orbital dependence of the electron-phonon coupling for a specific phonon mode.

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Article Synopsis
  • The article details a newly designed laser source specifically for time- and angle-resolved photoemission spectroscopy (TR-ARPES) aimed at investigating electron dynamics in quantum materials.
  • The laser system utilizes a combination of a ytterbium-doped laser, optical parametric amplifier (OPA), and difference frequency generation (DFG) to produce tunable near- and mid-infrared pulses, along with ultraviolet pulses for exciting materials like BiTe.
  • The authors showcase the stability of the laser source and present initial TR-ARPES results, highlighting its effectiveness in studying electronic behaviors in topological insulators.
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  • - Low back pain (LBP) is a major global disability issue, and effective clinical assessment tools are currently lacking; abnormal muscle control and fatigue are key factors involved.
  • - A study evaluated a new flexible surface electromyography (sEMG) system using PEVA electrodes and compared it with a traditional system, measuring muscle activity during two clinical tests for LBP assessment.
  • - The new sEMG system demonstrated similar sensitivity and validity to the traditional system in detecting muscle fatigue and activation patterns, suggesting its potential as a reliable tool for LBP assessment.
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Non-Hodgkin lymphomas (NHL) commonly occur in immunodeficient patients, both those infected by human immunodeficiency virus (HIV) and those who have been transplanted, and are often driven by Epstein-Barr virus (EBV) with cerebral localization, raising the question of tumor immunogenicity, a critical issue for treatment responses. We investigated the immunogenomics of 68 lymphoproliferative disorders from 51 immunodeficient (34 post-transplant, 17 HIV+) and 17 immunocompetent patients. Overall, 72% were large B-cell lymphoma and 25% were primary central nervous system lymphoma, while 40% were EBV+.

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Butyrate-producing bacteria are found in many outdoor ecosystems and host organisms, including humans, and are vital to ecosystem functionality and human health. These bacteria ferment organic matter, producing the short-chain fatty acid butyrate. However, the macroecological influences on their biogeographical distribution remain poorly resolved.

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The prognosis of relapsed primary central nervous system lymphoma (PCNSL) remains dismal. CAR T-cells are a major contributor to systemic lymphomas, but their use in PCNSL is limited. From the LOC network database, we retrospectively selected PCNSL who had leukapheresis for CAR-T cells from the third line of treatment, and, as controls, PCNSL treated with any treatment, at least in the third line and considered not eligible for ASCT.

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Article Synopsis
  • The study compares the clinical characteristics of primary myelofibrosis (PMF) and secondary myelofibrosis (SMF), highlighting key differences in patient presentation and symptoms.
  • It explores the molecular landscape of both conditions, analyzing genetic mutations and other molecular factors that may influence the disease.
  • The research also focuses on prognosis scoring systems, assessing how well they predict outcomes and survival rates for patients with PMF and SMF.
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In the pursuit of ultrathin and highly sensitive photodetectors, a promising approach involves leveraging the combination of light-sensitive two-dimensional (2D) semiconducting transition-metal dichalcogenides, such as MoSand the high electrical conductivity of graphene. Over the past decade, exfoliated 2D materials and electron-beam lithography have been used extensively to demonstrate feasibility on single devices. But for these devices to be used in the real-world systems, it is necessary to demonstrate good device performance similar to lab-based devices with repeatability of the results from device to device and a path to large scale manufacturing.

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  • Conducted a quantitative analysis of X-ray absorption spectroscopy (XAS) during the growth of ultrathin titanium disulfide (TiS) films using a two-step process involving atomic layer deposition/molecular layer deposition (ALD/MLD) and subsequent annealing.
  • This innovative approach separates growth and crystallization, initially producing an amorphous Ti-thiolate that transforms into crystalline TiS through thermal annealing.
  • Findings reveal the bonding nature at the interface with the SiO substrate, the gradual incorporation of sulfur during the process, and highlight the critical role of the annealing step in inducing transformation and sulfur loss, thus supporting the effectiveness of the two-step synthesis method.
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  • Current risk scores for thrombotic events in myeloproliferative neoplasms (MPN) fail to differentiate between arterial and venous thrombosis, even though they have different causes and implications.
  • A new score called ARTS, which considers factors like prior arterial thrombosis, age over 60, cardiovascular issues, and specific gene mutations, effectively stratifies patients into low- and high-risk groups for arterial thrombosis.
  • Conversely, the VEnous Thrombosis Score (VETS), which only looks at prior venous thrombosis and JAK2 mutations, does not perform well, highlighting the need for better venous risk assessments that address its complexity.
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We report on the delamination of thin (≈μm) hydrogel films grafted to silicon substrates under the action of swelling stresses. Poly(dimetylacrylamide) (PDMA) films are synthesized by simultaneously cross-linking and grafting preformed polymer chains onto the silicon substrate using a thiol-ene reaction. The grafting density at the film/substrate interface is tuned by varying the surface density of reactive thiol-silane groups on the silicon substrate.

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There is a growing recognition that responding to climate change necessitates urban adaptation. We sketch a transdisciplinary research effort, arguing that actionable research on urban adaptation needs to recognize the nature of cities as social networks embedded in physical space. Given the pace, scale and socioeconomic outcomes of urbanization in the Global South, the specificities and history of its cities must be central to the study of how well-known agglomeration effects can facilitate adaptation.

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Background: The need to detect new psychoactive substances in biological samples is of crucial interest. In this paper, the specificity of a benchtop immunoanalyzer commercialized by Randox was evaluated on real patient samples.

Method: The Evidence Investigator was assessed to screen for NPS on 80 serum and urine samples coming from patients admitted to the emergency department.

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In photoelectron spectroscopy, the measured electron momentum range is intrinsically related to the excitation photon energy. Low photon energies <10 eV are commonly encountered in laser-based photoemission and lead to a momentum range that is smaller than the Brillouin zones of most materials. This can become a limiting factor when studying condensed matter with laser-based photoemission.

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Background: The COVID-19 pandemic has disproportionately affected health care workers. We sought to estimate SARS-CoV-2 seroprevalence among hospital health care workers in Quebec, Canada, after the first wave of the pandemic and to explore factors associated with SARS-CoV-2 seropositivity.

Methods: Between July 6 and Sept.

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