Publications by authors named "SOMMER G"

This study aims to assess the outcomes of therapeutic options for aortic arch pathologies by comparing thoracic endovascular aortic repair (TEVAR) with open arch replacement (OAR) using woven polyester grafts from a mechanical and biomechanical perspective, with emphasis on ex vivo perfused human thoracic aortas reproducing heart rate and stroke volume conditions. Eleven non-diseased thoracic aortas from human cadavers were divided into TEVAR (n=5) and OAR (n=6) and tested using a custom-built mock circulation loop. Pressure, diameter, and stroke volume were monitored during perfusion before and after the intervention.

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The brain is arguably the most complex human organ and modelling its mechanical behaviour has challenged researchers for decades. There is still a lack of understanding on how this multiphase tissue responds to mechanical loading and how material parameters can be reliably calibrated. While previous viscoelastic models with two relaxation times have successfully captured the response of brain tissue, the Theory of Porous Media provides a continuum mechanical framework to explore the underlying physical mechanisms, including interactions between solid matrix and free-flowing interstitial fluid.

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  • Cystoscopy has long been the main method for detecting urothelial carcinoma (UCa), but its invasiveness and costs highlight the need for non-invasive detection methods, leading to the investigation of urinary biomarkers.
  • In a study involving 1,119 urine samples, researchers analyzed protein levels of biomarkers CXCL16 and TGFBI, along with DNA methylation at specific CpG sites, to assess their ability to identify UCa compared to other urological and gynecological cancers.
  • Results showed that while CXCL16 and TGFBI had moderate sensitivity (31% and 56%) and high specificity (94% and 85%), combining these proteins and methylation markers improved UCa detection sensitivity to 54%
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Computational fluid dynamics (CFD) simulations have been introduced to enable individualized risk prognosis for patients with unruptured cerebral aneurysms. The present contribution provides an overview of the biomechanical and physiological principles of aneurysm formation and rupture. It describes the computational steps of the CFD and the evaluated parameters.

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  • - Women can develop hypertension during the transition to menopause, with animal studies showing this condition linked to changes in NMDA receptors in the brain region responsible for regulating blood pressure.
  • - Using an accelerated ovarian failure model, researchers discovered that hypertensive peri-menopausal female mice had higher levels of a crucial NMDA receptor subunit (GluN1) in the cytoplasm compared to male mice.
  • - Activation of estrogen receptor beta (ERß) in peri-menopausal females not only diminished hypertension but also increased the presence of GluN1 in the cell membranes, unlike in male mice where ERß activation had no effect on blood pressure or GluN1 levels.
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RNA editing is a highly conserved process. Adenosine deaminase acting on RNA (ADAR) mediated deamination of adenosine (A-to-I editing) is associated with human disease and immune checkpoint control. Functional implications of A-to-I editing are currently of broad interest to academic and industrial research as underscored by the fast-growing number of clinical studies applying base editors as therapeutic tools.

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  • This study explores the impact of different IVF methods on birth weight and growth in children, specifically comparing those conceived through natural cycle IVF (NC-IVF) versus conventional stimulated IVF (c-IVF).
  • Findings suggest that children born via NC-IVF had a slightly higher median birth weight than those conceived through c-IVF, indicating potential long-term health benefits and reduced risk of catch-up growth.
  • The research also emphasizes that the growth trajectories of children born from NC-IVF may be more similar to those of naturally conceived children, which could lead to better cardiometabolic outcomes in their development.
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  • The study investigates the prevalence of parental smoking among childhood cancer survivors (CCS) in Switzerland and its impact on their respiratory health.* -
  • Researchers found that 18% of mothers and 23% of fathers smoke; maternal smoking increased the likelihood of CCS experiencing recurrent upper respiratory infections and lower respiratory symptoms.* -
  • The findings suggest that healthcare providers should focus on reducing caregiver smoking and offer support for smoking cessation to improve respiratory outcomes for CCS.*
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  • Eleven species of elephant fishes (Mormyridae) from the Sanaga River in Cameroon display dietary differences, indicating trophic niche partitioning despite their similar feeding habits on invertebrates.
  • The study reveals significant variations in stable isotope ratios, suggesting ecological diversification and potential influences from seasonal changes and human activities.
  • Geometric morphometric analyses demonstrate clear morphological distinctions among species, highlighting a relationship between body shape and isotopic signals, providing insights into their evolutionary interactions.
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Background: To improve tuberculosis case-finding, rapid, non-sputum triage tests need to be developed according to the World Health Organization target product profile (TPP) (>90% sensitivity, >70% specificity). We prospectively evaluated and compared artificial intelligence-based, computer-aided detection software, CAD4TBv7, and C-reactive protein assay (CRP) as triage tests at health facilities in Lesotho and South Africa.

Methods: Adults (≥18 years) presenting with ≥1 of the 4 cardinal tuberculosis symptoms were consecutively recruited between February 2021 and April 2022.

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  • * A study showed that rabbits lacking B vitamins experienced significant vascular damage when given Hcy, despite low cholesterol levels, including issues like collagen disorganization and impaired vascular reactivity.
  • * Findings indicate that Hcy promotes atherogenic changes in the aorta, suggesting its harmful effects extend beyond just high cholesterol conditions.
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Background: Neuroblastoma is the most common extracranial solid tumour in children. Relapsed or refractory neuroblastoma is associated with a poor outcome. We assessed the combination of irinotecan-temozolomide and dasatinib-rapamycin (RIST) in patients with relapsed or refractory neuroblastoma.

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Purpose: Childhood cancer and its treatment can cause damage to the musculoskeletal system. We aimed to determine the incidence and prevalence of musculoskeletal health conditions (MSHC) in survivors, and to investigate differences by cancer-related characteristics.

Methods: We used data from the Childhood Cancer Registry and the Swiss Childhood Cancer Survivor Study, including survivors (≥5 years since diagnosis; diagnosed 1976-2015 at <20 years of age) aged ≥15 years at study.

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Context: Steroidogenic factor 1 (NR5A1/SF-1) is a nuclear receptor that regulates sex development, steroidogenesis and reproduction. Genetic variants in NR5A1/SF-1 are common among differences of sex development (DSD) and associate with a wide range of phenotypes, but their pathogenic mechanisms remain unclear.

Objective: Novel, likely disease-causing NR5A1/SF-1 variants from the SF1next cohort of individuals with DSD were characterized to elucidate their pathogenic effect.

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(1) : Mechanical circulatory support (MCS) in myocardial infarction-associated cardiogenic shock is subject to debate. This analysis aims to elucidate the impact of MCS's timing on patient outcomes, based on data from the PREPARE CS registry. (2) : The PREPARE CS prospective registry includes patients who experienced cardiogenic shock (SCAI classes C-E) and were subsequently referred for cardiac catheterization.

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Background: Dietary factors, including high sugar intake, may have adverse effects on male reproduction. Studies of the association between sugar-sweetened beverage (SSB) intake and semen quality have reported inconsistent results.

Objective: We estimated the effects of SSB consumption on semen quality in a North American preconception cohort study.

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  • - This study aimed to evaluate how well PET/CT and MRI can predict relapse in patients with large-vessel giant cell arteritis (LV-GCA) after they stop treatment.
  • - Researchers analyzed data from 40 patients who had their treatment stopped while in remission, comparing imaging results between those who relapsed and those who didn’t.
  • - The findings indicated that imaging scores from PET/CT and MRI did not significantly differ between relapsing and non-relapsing patients, suggesting these methods may not be effective for guiding treatment decisions in LV-GCA.
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Childhood, adolescent, and young adult (CAYA) cancer survivors are at risk of pulmonary dysfunction. Current follow-up care guidelines are discordant. Therefore, the International Late Effects of Childhood Cancer Guideline Harmonization Group established and convened a panel of 33 experts to develop evidence-based surveillance guidelines.

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Cardiovascular diseases are the leading cause of death worldwide and include, among others, critical conditions of the aortic wall. Importantly, such critical conditions require effective diagnosis and treatment, which are not yet accurate enough. However, they could be significantly strengthened with predictive material models of the aortic wall.

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Background: Steroidogenic factor 1 (SF-1/NR5A1) is essential for human sex development. Heterozygous NR5A1/SF-1 variants manifest with a broad range of phenotypes of differences of sex development (DSD), which remain unexplained.

Methods: We conducted a retrospective analysis on the so far largest international cohort of individuals with NR5A1/SF-1 variants, identified through the I-DSD registry and a research network.

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We sought to investigate magnetic resonance imaging (MRI) parameters that correspond to vasculitis observed via [F]FDG positron emission tomography/computed tomography (PET/CT) and ultrasound in patients with large-vessel giant cell arteritis (LV-GCA). We performed a cross-sectional analysis of patients diagnosed with LV-GCA. Patients were selected if MRI, PET/CT, and vascular ultrasound were performed at the time of LV-GCA diagnosis.

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Dementia is often characterized by age-dependent cerebrovascular pathology, neuroinflammation, and cognitive deficits with notable sex differences in risk, disease onset, progression and severity. Women bear a disproportionate burden of dementia, and the onset of menopause (i.e.

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Background: Matrix metalloproteinase 12 (MMP12) is a macrophage-secreted protein that is massively upregulated as a pro-inflammatory factor in metabolic and vascular tissues of mice and humans suffering from cardiometabolic diseases (CMDs). However, the molecular mechanisms explaining the contributions of MMP12 to CMDs are still unclear.

Methods: We investigated the impact of MMP12 deficiency on CMDs in a mouse model that mimics human disease by simultaneously developing adipose tissue inflammation, insulin resistance, and atherosclerosis.

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Purpose: Childhood cancer survivors are at the risk of developing subsequent colorectal cancers (CRCs), but the absolute risks by treatment modality are uncertain. We quantified the absolute risks by radiotherapy treatment characteristics using clinically accessible data from a Pan-European wide case-control study nested within a large cohort of childhood cancer survivors: the PanCareSurFup Study.

Methods: Odds ratios (ORs) from a case-control study comprising 143 CRC cases and 143 controls nested within a cohort of 69,460 survivors were calculated.

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Background: The increased demand for decentralized blood sample collection presents numerous operational challenges for diagnostics providers. Sample degradation including sample hemolysis due to time, temperature, and handling between collection and laboratory analysis leads to limited test menus and unreliable results. Here we introduce the lightweight, portable Labcorp TrueSpin™ for rapid point-of-care blood separation using commercially available microvolume blood collection tubes.

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