1
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Steiner S, Pliego-Mendieta A, Haberecker M, Hussung S, Kollár A, Fritsch R, Arnold F, Lenggenhager D, Planas-Paz L, Pauli C. Ex vivo modeling of acquired drug resistance in BRAF - mutated pancreatic cancer organoids uncovers individual therapeutic vulnerabilities. Cancer Lett 2024; 584:216650. [PMID: 38246222 DOI: 10.1016/j.canlet.2024.216650] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 12/21/2023] [Accepted: 01/13/2024] [Indexed: 01/23/2024]
Abstract
Pancreatic ductal adenocarcinoma (PDAC) has a poor prognosis due to late detection and limited treatment options. Some PDAC patients harbor alterations that qualify for targeted treatment strategies but develop acquired resistance, leading to treatment failure. We here report the ex vivo modeling of acquired drug resistance by creating a PDAC patient-derived tumor organoid (PDTO) model harboring a rare BRAF R506_K507ins VLR mutation resulting in a resistance to trametinib, a MEK inhibitor. Genomic and transcriptomic analyses revealed upregulated WNT signaling in resistant PDTO clones compared to treatment-naïve parental control cells. By combining genomic and transcriptomic analysis with a functional drug testing approach, we uncovered a de novo upregulation and circumventive reliance on WNT signaling in resistant PDTO clones. Ex vivo models such as PDTOs represent valuable tools for resistance modelling and offer the discovery of novel therapeutic approaches for patients in need where clinical diagnostic tools are currently at the limit.
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Affiliation(s)
- Sabrina Steiner
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland
| | - Alicia Pliego-Mendieta
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland
| | - Martina Haberecker
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland
| | - Saskia Hussung
- Department of Hematology and Oncology, University Hospital Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Anna Kollár
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland
| | - Ralph Fritsch
- Department of Hematology and Oncology, University Hospital Zurich, Rämistrasse 100, 8091, Zurich, Switzerland
| | - Fabian Arnold
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland
| | - Daniela Lenggenhager
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland
| | - Lara Planas-Paz
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland
| | - Chantal Pauli
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Schmelzbergstrasse 12, 8091, Zurich, Switzerland; Medical Faculty, University of Zurich, Pestalozzistrasse 3, 8032, Zurich, Switzerland.
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2
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Treichler G, Hoeller S, Rueschoff JH, Rechsteiner M, Britschgi C, Arnold F, Zoche M, Hiltbrunner S, Moch H, Akhoundova D, Opitz I, Curioni-Fontecedro A. Improving the turnaround time of molecular profiling for advanced non-small cell lung cancer: Outcome of a new algorithm integrating multiple approaches. Pathol Res Pract 2023; 248:154660. [PMID: 37413876 DOI: 10.1016/j.prp.2023.154660] [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: 04/06/2023] [Revised: 06/29/2023] [Accepted: 06/30/2023] [Indexed: 07/08/2023]
Abstract
BACKGROUND Molecular tumor profiling to identify oncogenic drivers and actionable mutations has a profound impact on how lung cancer is treated. Especially in the subgroup of non-small cell lung cancer (NSCLC), molecular testing for certain mutations is crucial in daily clinical practice and is recommended by international guidelines. To date, a standardized approach to identify druggable genetic alterations are lacking. We have developed and implemented a new diagnostic algorithm to harmonize the molecular testing of NSCLC. PATIENTS AND METHODS In this retrospective analysis, we reviewed 119 patients diagnosed with NSCLC at the University Hospital Zurich. Tumor samples were analyzed using our standardized diagnostic algorithm: After the histological diagnosis was made, tissue samples were further analyzed by immunohistochemical stainings as well as the real-time PCR test Idylla™. Extracted DNA was further utilized for comprehensive genomic profiling (FoundationOne®CDx, F1CDx). RESULTS Out of the 119 patients were included in this study, 100 patients were diagnosed with non-squamous NSCLC (nsqNSCLC) and 19 with squamous NSCLC (sqNSCLC). The samples from the nsqNSCLC patients underwent testing by Idylla™ and were evaluated by immunohistochemistry (IHC). F1CDx analysis was run on 67 samples and 46 potentially actionable genomic alterations were detected. Ten patients received the indicated targeted treatment. The median time to test results was 4 days for the Idylla test, 5 days for IHC and 13 days for the F1CDx. CONCLUSION In patients with NSCLC, the implementation of a standardized molecular testing algorithm provided information on predictive markers for NSCLC within a few working days. The implementation of broader genomic profiling led to the identification of actionable targets, which would otherwise not have been discovered.
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Affiliation(s)
- G Treichler
- Department of Medical Oncology and Hematology University Hospital Zurich, Switzerland; Comprehensive Cancer Center Zurich, Switzerland; Department of Medical Oncology and Hematology, Cantonal Hospital Winterthur, Switzerland
| | - S Hoeller
- Department of Medical Oncology and Hematology University Hospital Zurich, Switzerland; Department of Pathology and Molecular Pathology, University Hospital Zurich, 8091 Zurich, Switzerland; University of Zurich, Switzerland; Comprehensive Cancer Center Zurich, Switzerland
| | - J H Rueschoff
- Department of Pathology and Molecular Pathology, University Hospital Zurich, 8091 Zurich, Switzerland
| | - M Rechsteiner
- Department of Pathology and Molecular Pathology, University Hospital Zurich, 8091 Zurich, Switzerland
| | - C Britschgi
- Department of Medical Oncology and Hematology University Hospital Zurich, Switzerland; University of Zurich, Switzerland; Comprehensive Cancer Center Zurich, Switzerland
| | - F Arnold
- Department of Pathology and Molecular Pathology, University Hospital Zurich, 8091 Zurich, Switzerland
| | - M Zoche
- Department of Pathology and Molecular Pathology, University Hospital Zurich, 8091 Zurich, Switzerland
| | - S Hiltbrunner
- Department of Medical Oncology and Hematology University Hospital Zurich, Switzerland; Comprehensive Cancer Center Zurich, Switzerland; Faculty of Science and Medicine, University of Fribourg, Switzerland
| | - H Moch
- Department of Pathology and Molecular Pathology, University Hospital Zurich, 8091 Zurich, Switzerland
| | - D Akhoundova
- Department of Medical Oncology and Hematology University Hospital Zurich, Switzerland; Comprehensive Cancer Center Zurich, Switzerland; Department of Oncology, University Hospital Bern, Switzerland
| | - I Opitz
- University of Zurich, Switzerland; Department of Thoracic Surgery, University Hospital Zurich, Switzerland
| | - A Curioni-Fontecedro
- Department of Medical Oncology and Hematology University Hospital Zurich, Switzerland; University of Zurich, Switzerland; Comprehensive Cancer Center Zurich, Switzerland; Faculty of Science and Medicine, University of Fribourg, Switzerland; Department of Oncology, Cantonal Hospital Fribourg, Switzerland.
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3
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Schraml P, Aimi F, Zoche M, Aguilera-Garcia D, Arnold F, Moch H, Hottiger MO. Altered cytoplasmic and nuclear ADP-ribosylation levels analyzed with an improved ADP-ribose binder are a prognostic factor in renal cell carcinoma. J Pathol Clin Res 2023. [PMID: 36999983 DOI: 10.1002/cjp2.320] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 02/03/2023] [Accepted: 03/10/2023] [Indexed: 04/01/2023]
Abstract
ADP-ribosylation (ADPR) of proteins is catalyzed by ADP-ribosyltransferases, which are targeted by inhibitors (i.e. poly(ADP-ribose) polymerase inhibitors [PARPi]). Although renal cell carcinoma (RCC) cells are sensitive in vitro to PARPi, studies on the association between ADPR levels and somatic loss of function mutations in DNA damage repair genes are currently missing. Here we observed, in two clear cell RCC (ccRCC) patient cohorts (n = 257 and n = 241) stained with an engineered ADP-ribose binding macrodomain (eAf1521), that decreased cytoplasmic ADPR (cyADPR) levels significantly correlated with late tumor stage, high-ISUP (the International Society of Urological Pathology) grade, presence of necrosis, dense lymphocyte infiltration, and worse patient survival (p < 0.01 each). cyADPR proved to be an independent prognostic factor (p = 0.001). Comparably, absence of nuclear ADPR staining in ccRCC correlated with absence of PARP1 staining (p < 0.01) and worse patient outcome (p < 0.05). In papillary RCC the absence of cyADPR was also significantly associated with tumor progression and worse patient outcome (p < 0.05 each). To interrogate whether the ADPR status could be associated with genetic alterations in DNA repair, chromatin remodeling, and histone modulation, we performed DNA sequence analysis and identified a significant association of increased ARID1A mutations in ccRCCcyADPR+++/PARP1+ compared with ccRCCcyADPR-/PARP1- (31% versus 4%; p < 0.05). Collectively, our data suggest the prognostic value of nuclear and cytoplasmic ADPR levels in RCC that might be further influenced by genetic alterations.
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Affiliation(s)
- Peter Schraml
- Department of Pathology and Molecular Pathology, University Hospital Zurich (USZ), Zurich, Switzerland
| | - Fabio Aimi
- Department of Pathology and Molecular Pathology, University Hospital Zurich (USZ), Zurich, Switzerland
- Department of Molecular Mechanism of Disease (DMMD), University of Zurich (UZH), Zurich, Switzerland
| | - Martin Zoche
- Department of Pathology and Molecular Pathology, University Hospital Zurich (USZ), Zurich, Switzerland
| | - Domingo Aguilera-Garcia
- Department of Pathology and Molecular Pathology, University Hospital Zurich (USZ), Zurich, Switzerland
| | - Fabian Arnold
- Department of Pathology and Molecular Pathology, University Hospital Zurich (USZ), Zurich, Switzerland
| | - Holger Moch
- Department of Pathology and Molecular Pathology, University Hospital Zurich (USZ), Zurich, Switzerland
| | - Michael O Hottiger
- Department of Molecular Mechanism of Disease (DMMD), University of Zurich (UZH), Zurich, Switzerland
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4
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Planas-Paz L, Pliego-Mendieta A, Hagedorn C, Aguilera Garcia D, Haberecker M, Arnold F, Herzog M, Bankel L, Guggenberger R, Steiner S, Chen Y, Kahraman A, Zoche M, Rubin M, Moch H, Britschgi C, Pauli C. 109P Unraveling homologous recombination deficiency and therapeutic opportunities in soft tissue and bone sarcoma. ESMO Open 2023. [DOI: 10.1016/j.esmoop.2023.101146] [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: 04/05/2023] Open
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5
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Lewisch E, Arnold F, Fuehrer HP, Harl J, Thielen F, El-Matbouli M. Parasites and their impact on thick-shelled river mussels Unio crassus from two populations in Luxembourg. Dis Aquat Organ 2023; 153:31-43. [PMID: 36794839 DOI: 10.3354/dao03718] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The thick-shelled river mussel Unio crassus Philipsson, 1788 is a species native to many European habitats, with declining populations. The impact of parasite communities on health status of this species is poorly understood. In this study, parasites of 30 U. crassus specimens from the Our and Sauer Rivers in Luxembourg were identified morphologically and, in some cases, using molecular genetic methods. The findings were correlated to selected parameters (total length, visceral weight, shell lesions, gonadal stage). The 2 populations did not differ in shell length, visceral weight, number of males and females, gonadal scoring, shell lesions, and the occurrence of glochidia. The prevalence and infestation intensities of detected Trichodina sp., Conchophthirus sp., and freshwater mite larvae did not differ between the 2 populations, whereas the prevalence and infestation intensities of mite eggs, nymphs, and adults were significantly higher in the Sauer River. Rhipidocotyle campanula and European bitterling Rhodeus amarus larvae were only present in the Sauer. Histopathology revealed the destruction of the gonads by R. campanula and tissue damage by the mites. The only significant correlation of the selected parameters was a positive correlation between R. amarus occurrence and total length as well as a negative correlation between R. amarus occurrence and gonadal stage. In the Sauer River, 2 mussels were found to be hermaphrodites.
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Affiliation(s)
- E Lewisch
- Clinical Division of Fish Medicine, University of Veterinary Medicine, 1210 Vienna, Austria
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6
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Planas-Paz L, Pliego-Mendieta A, Hagedorn C, Aguilera-Garcia D, Haberecker M, Arnold F, Herzog M, Bankel L, Guggenberger R, Steiner S, Chen Y, Kahraman A, Zoche M, Rubin MA, Moch H, Britschgi C, Pauli C. Unravelling homologous recombination repair deficiency and therapeutic opportunities in soft tissue and bone sarcoma. EMBO Mol Med 2023; 15:e16863. [PMID: 36779660 PMCID: PMC10086583 DOI: 10.15252/emmm.202216863] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 01/18/2023] [Accepted: 01/24/2023] [Indexed: 02/14/2023] Open
Abstract
Defects in homologous recombination repair (HRR) in tumors correlate with poor prognosis and metastases development. Determining HRR deficiency (HRD) is of major clinical relevance as it is associated with therapeutic vulnerabilities and remains poorly investigated in sarcoma. Here, we show that specific sarcoma entities exhibit high levels of genomic instability signatures and molecular alterations in HRR genes, while harboring a complex pattern of chromosomal instability. Furthermore, sarcomas carrying HRDness traits exhibit a distinct SARC-HRD transcriptional signature that predicts PARP inhibitor sensitivity in patient-derived sarcoma cells. Concomitantly, HRDhigh sarcoma cells lack RAD51 nuclear foci formation upon DNA damage, further evidencing defects in HRR. We further identify the WEE1 kinase as a therapeutic vulnerability for sarcomas with HRDness and demonstrate the clinical benefit of combining DNA damaging agents and inhibitors of DNA repair pathways ex vivo and in the clinic. In summary, we provide a personalized oncological approach to treat sarcoma patients successfully.
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Affiliation(s)
- Lara Planas-Paz
- Laboratory for Systems Pathology and Functional Tumor Pathology, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Alicia Pliego-Mendieta
- Laboratory for Systems Pathology and Functional Tumor Pathology, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Catherine Hagedorn
- Laboratory for Systems Pathology and Functional Tumor Pathology, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Domingo Aguilera-Garcia
- Molecular Tumor Profiling Laboratory, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Martina Haberecker
- Laboratory for Systems Pathology and Functional Tumor Pathology, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Fabian Arnold
- Molecular Tumor Profiling Laboratory, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Marius Herzog
- Laboratory for Systems Pathology and Functional Tumor Pathology, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Lorenz Bankel
- Department of Medical Oncology and Haematology, University Hospital Zurich, Zurich, Switzerland
| | - Roman Guggenberger
- Diagnostic and Interventional Radiology, University Hospital Zurich, Zurich, Switzerland
| | - Sabrina Steiner
- Laboratory for Systems Pathology and Functional Tumor Pathology, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Yanjiang Chen
- Laboratory for Systems Pathology and Functional Tumor Pathology, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Abdullah Kahraman
- Molecular Tumor Profiling Laboratory, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland.,Swiss Institute of Bioinformatics, Lausanne, Switzerland
| | - Martin Zoche
- Molecular Tumor Profiling Laboratory, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Mark A Rubin
- Precision Oncology Laboratory, Department for Biomedical Research, Bern Center for Precision Medicine, Bern, Switzerland
| | - Holger Moch
- Laboratory for Systems Pathology and Functional Tumor Pathology, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Christian Britschgi
- Department of Medical Oncology and Haematology, University Hospital Zurich, Zurich, Switzerland
| | - Chantal Pauli
- Laboratory for Systems Pathology and Functional Tumor Pathology, Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland.,Medical Faculty, University of Zurich, Zurich, Switzerland
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7
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Chen Y, Herzog M, Pliego-Mendieta A, Bühler MM, Harnisch KJ, Haberecker M, Arnold F, Planas-Paz L, Pauli C. Addressing Modern Diagnostic Pathology for Patient-Derived Soft Tissue Sarcosphere Models in the Era of Functional Precision Oncology. J Transl Med 2023; 103:100039. [PMID: 36870294 DOI: 10.1016/j.labinv.2022.100039] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 11/28/2022] [Accepted: 12/02/2022] [Indexed: 01/11/2023] Open
Abstract
Responses to therapy often cannot be exclusively predicted by molecular markers, thus evidencing a critical need to develop tools for better patient selection based on relations between tumor phenotype and genotype. Patient-derived cell models could help to better refine patient stratification procedures and lead to improved clinical management. So far, such ex vivo cell models have been used for addressing basic research questions and in preclinical studies. As they now enter the era of functional precision oncology, it is of utmost importance that they meet quality standards to fully represent the molecular and phenotypical architecture of patients' tumors. Well-characterized ex vivo models are imperative for rare cancer types with high patient heterogeneity and unknown driver mutations. Soft tissue sarcomas account for a very rare, heterogeneous group of malignancies that are challenging from a diagnostic standpoint and difficult to treat in a metastatic setting because of chemotherapy resistance and a lack of targeted treatment options. Functional drug screening in patient-derived cancer cell models is a more recent approach for discovering novel therapeutic candidate drugs. However, because of the rarity and heterogeneity of soft tissue sarcomas, the number of well-established and characterized sarcoma cell models is extremely limited. Within our hospital-based platform we establish high-fidelity patient-derived ex vivo cancer models from solid tumors for enabling functional precision oncology and addressing research questions to overcome this problem. We here present 5 novel, well-characterized, complex-karyotype ex vivo soft tissue sarcosphere models, which are effective tools to study molecular pathogenesis and identify the novel drug sensitivities of these genetically complex diseases. We addressed the quality standards that should be generally considered for the characterization of such ex vivo models. More broadly, we suggest a scalable platform to provide high-fidelity ex vivo models to the scientific community and enable functional precision oncology.
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Affiliation(s)
- Yanjiang Chen
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Marius Herzog
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Alicia Pliego-Mendieta
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Marco Matteo Bühler
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Kim Jannis Harnisch
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Martina Haberecker
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Fabian Arnold
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Lara Planas-Paz
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Chantal Pauli
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland; Medical Faculty, University of Zurich, Zurich, Switzerland.
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8
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Akhoundova D, Hussung S, Sivakumar S, Töpfer A, Rechsteiner M, Kahraman A, Arnold F, Angst F, Britschgi C, Zoche M, Moch H, Weber A, Sokol E, Fritsch RM. ROS1 genomic rearrangements are rare actionable drivers in microsatellite stable colorectal cancer. Int J Cancer 2022; 151:2161-2171. [PMID: 36053834 PMCID: PMC9804412 DOI: 10.1002/ijc.34257] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Revised: 07/05/2022] [Accepted: 07/14/2022] [Indexed: 01/05/2023]
Abstract
c-Ros oncogene 1, receptor tyrosine kinase (ROS1) genomic rearrangements have been reported previously in rare cases of colorectal cancer (CRC), yet little is known about the frequency, molecular characteristics, and therapeutic vulnerabilities of ROS1-driven CRC. We analyzed a clinical dataset of 40 589 patients with CRC for ROS1 genomic rearrangements and their associated genomic characteristics (Foundation Medicine, Inc [FMI]). We moreover report the disease course and treatment response of an index patient with ROS1-rearranged metastatic CRC. ROS1 genomic rearrangements were identified in 34 (0.08%) CRC samples. GOPC-ROS1 was the most common ROS1 fusion identified (11 samples), followed by TTC28-ROS1 (3 samples). Four novel 5' gene partners of ROS1 were identified (MCM9, SRPK1, EPHA6, P4HA1). Contrary to previous reports on fusion-positive CRC, ROS1-rearrangements were found exclusively in microsatellite stable (MSS) CRCs. KRAS mutations were significantly less abundant in ROS1-rearranged vs ROS1 wild type cases. The index patient presented with chemotherapy-refractory metastatic right-sided colon cancer harboring GOPC-ROS1. Molecularly targeted treatment with crizotinib induced a rapid and sustained partial response. After 15 months on crizotinib disseminated tumor progression occurred and KRAS Q61H emerged in tissue and liquid biopsies. ROS1 rearrangements define a small, yet therapeutically actionable molecular subgroup of MSS CRC. In summary, the high prevalence of GOPC-ROS1 and noncanonical ROS1 fusions pose diagnostic challenges. We advocate NGS-based comprehensive molecular profiling of MSS CRCs that are wild type for RAS and BRAF and patient enrollment in precision trials.
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Affiliation(s)
- Dilara Akhoundova
- Department of Medical Oncology and HematologyUniversity Hospital of ZurichZurichSwitzerland
| | - Saskia Hussung
- Department of Medical Oncology and HematologyUniversity Hospital of ZurichZurichSwitzerland
| | - Smruthy Sivakumar
- Cancer Genomics ResearchFoundation Medicine, IncCambridgeMassachusettsUSA
| | - Antonia Töpfer
- Department of Pathology and Molecular PathologyUniversity Hospital of ZurichZurichSwitzerland
| | - Markus Rechsteiner
- Department of Pathology and Molecular PathologyUniversity Hospital of ZurichZurichSwitzerland
| | - Abdullah Kahraman
- Department of Pathology and Molecular PathologyUniversity Hospital of ZurichZurichSwitzerland
| | - Fabian Arnold
- Department of Pathology and Molecular PathologyUniversity Hospital of ZurichZurichSwitzerland
| | - Florian Angst
- Institute of Diagnostic and Interventional RadiologyUniversity Hospital of ZurichZurichSwitzerland
| | - Christian Britschgi
- Department of Medical Oncology and HematologyUniversity Hospital of ZurichZurichSwitzerland
| | - Martin Zoche
- Department of Pathology and Molecular PathologyUniversity Hospital of ZurichZurichSwitzerland
| | - Holger Moch
- Department of Pathology and Molecular PathologyUniversity Hospital of ZurichZurichSwitzerland
| | - Achim Weber
- Department of Pathology and Molecular PathologyUniversity Hospital of ZurichZurichSwitzerland
| | - Ethan Sokol
- Cancer Genomics ResearchFoundation Medicine, IncCambridgeMassachusettsUSA
| | - Ralph M. Fritsch
- Department of Medical Oncology and HematologyUniversity Hospital of ZurichZurichSwitzerland
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9
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Arnold F, Staniszewski MS, Pelzl L, Ramenda C, Gahr M, Hoffmann S. Vision and vocal communication guide three-dimensional spatial coordination of zebra finches during wind-tunnel flights. Nat Ecol Evol 2022; 6:1221-1230. [PMID: 35773345 PMCID: PMC9349042 DOI: 10.1038/s41559-022-01800-4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 05/19/2022] [Indexed: 12/01/2022]
Abstract
Animal collective motion is a natural phenomenon readily observable in various taxa. Although theoretical models can predict the macroscopic pattern of group movements based on the relative spatial position of group members, it is poorly understood how group members exchange directional information, which enables the spatial coordination between individuals during collective motion. To test if vocalizations emitted during flocking flight are used by birds to transmit directional information between group members, we recorded vocal behaviour, head orientation and spatial position of each individual in a small flock of zebra finches (Taeniopygia guttata) flying in a wind tunnel. We found that the finches can use both visual and acoustic cues for three-dimensional flock coordination. When visual information is insufficient, birds can increasingly exploit active vocal communication to avoid collisions with flock mates. Our study furthers the mechanistic understanding of collective motion in birds and highlights the impact interindividual vocal interactions can have on group performances in these animals. Zebra finches flying in a wind tunnel use both vocal and visual communication to orientate themselves within the flock, and are able to enhance their use of one form of communication over another depending on circumstance.
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Affiliation(s)
- Fabian Arnold
- Department of Behavioural Neurobiology, Max Planck Institute for Ornithology, Seewiesen, Germany.,Faculty of Biology, Ludwig-Maximilians-University of Munich, Planegg-Martinsried, Germany.,TUM School of Life Sciences, Technical University of Munich, Freising, Germany
| | - Michael S Staniszewski
- Department of Behavioural Neurobiology, Max Planck Institute for Ornithology, Seewiesen, Germany.,Faculty of Biology, Ludwig-Maximilians-University of Munich, Planegg-Martinsried, Germany.,Faculty of Sciences and Bioengineering Sciences, Vrije Universiteit Brussel, Elsene, Belgium
| | - Lisa Pelzl
- Department of Behavioural Neurobiology, Max Planck Institute for Ornithology, Seewiesen, Germany.,Faculty of Biology, Ludwig-Maximilians-University of Munich, Planegg-Martinsried, Germany.,Faculty of Biology, Ludwig-Maximilians-University of Munich, Planegg-Martinsried, Germany
| | - Claudia Ramenda
- Department of Behavioural Neurobiology, Max Planck Institute for Ornithology, Seewiesen, Germany.,Department of Behavioural Neurobiology, Max Planck Institute for Biological Intelligence (in Foundation), Seewiesen, Germany
| | - Manfred Gahr
- Department of Behavioural Neurobiology, Max Planck Institute for Ornithology, Seewiesen, Germany.,Department of Behavioural Neurobiology, Max Planck Institute for Biological Intelligence (in Foundation), Seewiesen, Germany
| | - Susanne Hoffmann
- Department of Behavioural Neurobiology, Max Planck Institute for Ornithology, Seewiesen, Germany. .,Department of Behavioural Neurobiology, Max Planck Institute for Biological Intelligence (in Foundation), Seewiesen, Germany.
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10
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Haberecker M, Bühler MM, Mendieta AP, Guggenberger R, Arnold F, Markert E, Rechsteiner M, Zoche M, Britschgi C, Pauli C. Molecular and immunophenotypic characterization of SMARCB1 (INI1) - deficient intrathoracic Neoplasms. Mod Pathol 2022; 35:1860-1869. [PMID: 35864317 PMCID: PMC9708576 DOI: 10.1038/s41379-022-01133-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 06/20/2022] [Accepted: 06/20/2022] [Indexed: 12/24/2022]
Abstract
The switch/sucrose-non-fermenting (SWI/SNF) complex is an ATP-dependent chromatin remodeling complex that plays important roles in DNA repair, transcription and cell differentiation. This complex consists of multiple subunits and is of particular interest in thoracic malignancies due to frequent subunit alteration of SMARCA4 (BRG1). Much less is known about SMARCB1 (INI1) deficient intrathoracic neoplasms, which are rare, often misclassified and understudied. In a retrospective analysis of 1479 intrathoracic malignant neoplasms using immunohistochemistry for INI1 (SMARCB1) on tissue micro arrays (TMA) and a search through our hospital sarcoma database, we identified in total nine intrathoracic, INI1 deficient cases (n = 9). We characterized these cases further by additional immunohistochemistry, broad targeted genomic analysis, methylation profiling and correlated them with clinical and radiological data. This showed that genomic SMARCB1 together with tumor suppressor alterations drive tumorigenesis in some of these cases, rather than epigenetic changes such as DNA methylation. A proper diagnostic classification, however, remains challenging. Intrathoracic tumors with loss or alteration of SMARCB1 (INI1) are highly aggressive and remain often underdiagnosed due to their rarity, which leads to false diagnostic interpretations. A better understanding of these tumors and proper diagnosis is important for better patient care as clinical trials and more targeted therapeutic options are emerging.
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Affiliation(s)
- Martina Haberecker
- grid.412004.30000 0004 0478 9977Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Marco Matteo Bühler
- grid.412004.30000 0004 0478 9977Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Alicia Pliego Mendieta
- grid.412004.30000 0004 0478 9977Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Roman Guggenberger
- grid.412004.30000 0004 0478 9977Department of Radiology, University Hospital Zurich, Zurich, Switzerland
| | - Fabian Arnold
- grid.412004.30000 0004 0478 9977Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Eva Markert
- grid.413349.80000 0001 2294 4705Institute of Pathology, Kantonsspital St. Gallen, St. Gallen, Switzerland
| | - Markus Rechsteiner
- grid.412004.30000 0004 0478 9977Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Martin Zoche
- grid.412004.30000 0004 0478 9977Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland
| | - Christian Britschgi
- grid.412004.30000 0004 0478 9977Department of Medical Oncology and Hematology, University Hospital Zurich, Comprehensive Cancer Center Zurich, Zurich, Switzerland
| | - Chantal Pauli
- Department of Pathology and Molecular Pathology, University Hospital Zurich, Zurich, Switzerland. .,University Zurich, Zurich, Switzerland.
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Bankel L, Wegmann R, Dedes K, Franzen D, Bode P, Zoche M, Arnold F, Moch H, Manz M, Britschgi C, Snijder B. 1790P Single-cell ex vivo drug response testing platform on fluid samples from patients with solid tumors. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.08.1733] [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: 12/01/2022] Open
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12
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Vassal G, Kozhaeva O, Griskjane S, Arnold F, Nysom K, Basset L, Kameric L, Kienesberger A, Kamal S, Cherny N, Bricalli G, Latino N, Kearns P. Access to essential anticancer medicines for children and adolescents in Europe. Ann Oncol 2021; 32:560-568. [PMID: 33388384 DOI: 10.1016/j.annonc.2020.12.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 12/16/2020] [Accepted: 12/20/2020] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND Essential anticancer medicines are an indispensable component of multidisciplinary treatment of paediatric malignancies. A European Society for Medical Oncology (ESMO) study reported inequalities in the availability of anticancer medicines for adult solid tumours and provided a model for the present survey. The aim of this survey was to assess the accessibility of essential medicines used in paediatric cancer patients aged 0 to 18 years across Europe from 2016 to 2018. METHODS A list of medicines was drawn with input from the European Society for Paediatric Oncology (SIOP Europe) Clinical Research Council referring to the World Health Organization Model List of Essential Medicines for Children (WHO EMLc) 2017. A survey was sent to nominated national clinician and pharmacist rapporteurs and parent associations in up to 37 countries; answers were obtained from 34 countries. RESULTS The full survey list contained 68 medicines, including 24 on the WHO EMLc 2017. Health professionals reported that 35% of all medicines were prescribed off-label in at least one country and that 44% were always available in >90% of countries. Only 63% of the EMLc 2017 medicines were reported as always available. The main determinant of unavailability was shortages, reported for 72% of medicines in at least one country. Out-of-pocket costs were reported in eight countries. Twenty-seven percent of orally administered medicines were never available in child-friendly formulations. Parents detailed individual efforts and challenges of facilitating ingestion of oral medicines as prescribed. Inequalities in access to pain control during procedures were reported by parents across Europe. CONCLUSIONS Children and adolescents with cancer in Europe experience lack of access to essential medicines. Urgent actions are needed to address shortages, financial accessibility, availability of safe age-appropriate oral formulations, and pain management across Europe.
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Affiliation(s)
- G Vassal
- Paediatric Oncology Department, Gustave Roussy, Villejuif, France; Paris-Sud University, Orsay, France; European Society for Paediatric Oncology (SIOP Europe), Brussels, Belgium.
| | - O Kozhaeva
- Policy Department, SIOP Europe, Brussels, Belgium
| | - S Griskjane
- Children's Clinical University Hospital, Riga, Latvia; European Society of Oncology Pharmacy (ESOP), Luxembourg
| | - F Arnold
- Childhood Cancer International - Europe (CCI-E), Montpellier, France
| | - K Nysom
- Department of Paediatrics and Adolescent Medicine, Rigshospitalet, Copenhagen, Denmark; SIOP Europe, Brussels, Belgium
| | - L Basset
- CCI-E, Madrid, Spain; Universitat Politècnica de València, Valencia, Spain
| | - L Kameric
- CCI-E, Sarajevo, Bosnia and Herzegovina
| | | | - S Kamal
- Department of Pharmaceutical Services, Children's Cancer Hospital, Cairo, Egypt; ESOP, Luxembourg
| | - N Cherny
- Cancer Pain and Palliative Medicine Service, Department of Medical Oncology, Shaare Zedek Medical Center, Jerusalem, Israel; European Society for Medical Oncology (ESMO), Lugano, Switzerland
| | - G Bricalli
- European Society for Medical Oncology (ESMO), Lugano, Switzerland
| | - N Latino
- European Society for Medical Oncology (ESMO), Lugano, Switzerland
| | - P Kearns
- Institute of Cancer and Genomic Sciences, NIHR Birmingham Biomedical Research Centre, University of Birmingham, Birmingham, UK; SIOP Europe, Brussels, Belgium
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Pakpour-Tabrizi AC, Schenk AK, Holt AJU, Mahatha SK, Arnold F, Bianchi M, Jackman RB, Butler JE, Vikharev A, Miwa JA, Hofmann P, Cooil SP, Wells JW, Mazzola F. The occupied electronic structure of ultrathin boron doped diamond. Nanoscale Adv 2020; 2:1358-1364. [PMID: 36133056 PMCID: PMC9417656 DOI: 10.1039/c9na00593e] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 01/27/2020] [Indexed: 06/13/2023]
Abstract
Using angle-resolved photoelectron spectroscopy, we compare the electronic band structure of an ultrathin (1.8 nm) δ-layer of boron-doped diamond with a bulk-like boron doped diamond film (3 μm). Surprisingly, the measurements indicate that except for a small change in the effective mass, there is no significant difference between the electronic structure of these samples, irrespective of their physical dimensionality, except for a small modification of the effective mass. While this suggests that, at the current time, it is not possible to fabricate boron-doped diamond structures with quantum properties, it also means that nanoscale boron doped diamond structures can be fabricated which retain the classical electronic properties of bulk-doped diamond, without a need to consider the influence of quantum confinement.
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Affiliation(s)
- A C Pakpour-Tabrizi
- London Centre for Nanotechnology, Department of Electronic and Electrical Engineering, University College London 17-19 Gordon Street London WC1H 0AH UK
| | - A K Schenk
- Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology NO-7491 Trondheim Norway
| | - A J U Holt
- Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University 8000 Aarhus C Denmark
| | - S K Mahatha
- Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University 8000 Aarhus C Denmark
| | - F Arnold
- Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University 8000 Aarhus C Denmark
| | - M Bianchi
- Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University 8000 Aarhus C Denmark
| | - R B Jackman
- London Centre for Nanotechnology, Department of Electronic and Electrical Engineering, University College London 17-19 Gordon Street London WC1H 0AH UK
| | - J E Butler
- Cubic Carbon Ceramics 855 Carson Road Huntingtown MD 20639 USA
| | - A Vikharev
- Institute of Applied Physics, Russian Academy of Sciences 46 Ul'yanov Street Nizhny Novgorod 603950 Russia
| | - J A Miwa
- Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University 8000 Aarhus C Denmark
| | - P Hofmann
- Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University 8000 Aarhus C Denmark
| | - S P Cooil
- Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology NO-7491 Trondheim Norway
- Department of Physics, Aberystwyth University Aberystwyth SY23 3BZ UK
| | - J W Wells
- Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology NO-7491 Trondheim Norway
| | - F Mazzola
- Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology NO-7491 Trondheim Norway
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Giraud S, Samimi M, Gaboriaud P, Arnold F, Kervarrec T, Wierzbicka-Hainaut E, Bens G, Beneton N, Aubin F, Dréno B, Laude H, Avril M, Dupin N, Dinulescu M, Le Corre Y, Blom A, Maubec E, Guyetant S, Touzé A. Sérologie anti-antigène T du polyomavirus de Merkel dans la surveillance des patients ayant un carcinome de Merkel : étude rétrospective multicentrique. Ann Dermatol Venereol 2018. [DOI: 10.1016/j.annder.2018.09.144] [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: 10/27/2022]
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15
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Modic KA, Bachmann MD, Ramshaw BJ, Arnold F, Shirer KR, Estry A, Betts JB, Ghimire NJ, Bauer ED, Schmidt M, Baenitz M, Svanidze E, McDonald RD, Shekhter A, Moll PJW. Resonant torsion magnetometry in anisotropic quantum materials. Nat Commun 2018; 9:3975. [PMID: 30266902 PMCID: PMC6162279 DOI: 10.1038/s41467-018-06412-w] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [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: 03/12/2018] [Accepted: 08/29/2018] [Indexed: 11/09/2022] Open
Abstract
Unusual behavior in quantum materials commonly arises from their effective low-dimensional physics, reflecting the underlying anisotropy in the spin and charge degrees of freedom. Here we introduce the magnetotropic coefficient k = ∂2F/∂θ2, the second derivative of the free energy F with respect to the magnetic field orientation θ in the crystal. We show that the magnetotropic coefficient can be quantitatively determined from a shift in the resonant frequency of a commercially available atomic force microscopy cantilever under magnetic field. This detection method enables part per 100 million sensitivity and the ability to measure magnetic anisotropy in nanogram-scale samples, as demonstrated on the Weyl semimetal NbP. Measurement of the magnetotropic coefficient in the spin-liquid candidate RuCl3 highlights its sensitivity to anisotropic phase transitions and allows a quantitative comparison to other thermodynamic coefficients via the Ehrenfest relations.
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Affiliation(s)
- K A Modic
- Max-Planck-Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, D-01187, Dresden, Germany.
| | - Maja D Bachmann
- Max-Planck-Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, D-01187, Dresden, Germany
| | - B J Ramshaw
- Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY, 14853, USA
| | - F Arnold
- Max-Planck-Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, D-01187, Dresden, Germany
| | - K R Shirer
- Max-Planck-Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, D-01187, Dresden, Germany
| | - Amelia Estry
- Max-Planck-Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, D-01187, Dresden, Germany
| | - J B Betts
- Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Nirmal J Ghimire
- Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.,Argonne National Laboratory, Lemont, IL, 60439, USA
| | - E D Bauer
- Los Alamos National Laboratory, Los Alamos, NM, 87545, USA
| | - Marcus Schmidt
- Max-Planck-Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, D-01187, Dresden, Germany
| | - Michael Baenitz
- Max-Planck-Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, D-01187, Dresden, Germany
| | - E Svanidze
- Max-Planck-Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, D-01187, Dresden, Germany
| | | | - Arkady Shekhter
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA
| | - Philip J W Moll
- Max-Planck-Institute for Chemical Physics of Solids, Noethnitzer Strasse 40, D-01187, Dresden, Germany. .,EPFL STI IMX-GE MXC 240, CH-1015, Lausanne, Switzerland.
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16
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Arnold F, Warmuth J, Michiardi M, Fikáček J, Bianchi M, Hu J, Mao Z, Miwa J, Raj Singh U, Bremholm M, Wiesendanger R, Honolka J, Wehling T, Wiebe J, Hofmann P. Electronic structure of Fe 1.08Te bulk crystals and epitaxial FeTe thin films on Bi 2Te 3. J Phys Condens Matter 2018; 30:065502. [PMID: 29327694 DOI: 10.1088/1361-648x/aaa43e] [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] [Indexed: 06/07/2023]
Abstract
The electronic structure of thin films of FeTe grown on Bi2Te3 is investigated using angle-resolved photoemission spectroscopy, scanning tunneling microscopy and first principles calculations. As a comparison, data from cleaved bulk Fe1.08Te taken under the same experimental conditions is also presented. Due to the substrate and thin film symmetry, FeTe thin films grow on Bi2Te3 in three domains, rotated by 0°, 120°, and 240°. This results in a superposition of photoemission intensity from the domains, complicating the analysis. However, by combining bulk and thin film data, it is possible to partly disentangle the contributions from three domains. We find a close similarity between thin film and bulk electronic structure and an overall good agreement with first principles calculations, assuming a p-doping shift of 65 meV for the bulk and a renormalization factor of around two. By tracking the change of substrate electronic structure upon film growth, we find indications of an electron transfer from the FeTe film to the substrate. No significant change of the film's electronic structure or doping is observed when alkali atoms are dosed onto the surface. This is ascribed to the film's high density of states at the Fermi energy. This behavior is also supported by the ab initio calculations.
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Affiliation(s)
- Fabian Arnold
- Department of Physics and Astronomy, Interdisciplinary Nanoscience Center (iNANO), Aarhus University, 8000 Aarhus C, Denmark
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17
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Arnold F, Naumann M, Lühmann T, Mackenzie AP, Hassinger E. Application of SQUIDs to low temperature and high magnetic field measurements-Ultra low noise torque magnetometry. Rev Sci Instrum 2018; 89:023901. [PMID: 29495810 DOI: 10.1063/1.5011655] [Citation(s) in RCA: 1] [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: 06/08/2023]
Abstract
Torque magnetometry is a key method to measure the magnetic anisotropy and quantum oscillations in metals. In order to resolve quantum oscillations in sub-millimeter sized samples, piezo-electric micro-cantilevers were introduced. In the case of strongly correlated metals with large Fermi surfaces and high cyclotron masses, magnetic torque resolving powers in excess of 104 are required at temperatures well below 1 K and magnetic fields beyond 10 T. Here, we present a new broadband read-out scheme for piezo-electric micro-cantilevers via Wheatstone-type resistance measurements in magnetic fields up to 15 T and temperatures down to 200 mK. By using a two-stage superconducting-quantum interference device as a null detector of a cold Wheatstone bridge, we were able to achieve a magnetic moment resolution of Δm = 4 × 10-15 J/T at maximal field and 700 mK, outperforming conventional magnetometers by at least one order of magnitude in this temperature and magnetic field range. Exemplary de Haas-van Alphen measurement of a newly grown delafossite, PdRhO2, was used to show the superior performance of our setup.
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Affiliation(s)
- F Arnold
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - M Naumann
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Th Lühmann
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - A P Mackenzie
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - E Hassinger
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
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18
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Arnold F, Isidori A, Kampert E, Yager B, Eschrig M, Saunders J. Charge Density Waves in Graphite: Towards the Magnetic Ultraquantum Limit. Phys Rev Lett 2017; 119:136601. [PMID: 29341727 DOI: 10.1103/physrevlett.119.136601] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Indexed: 06/07/2023]
Abstract
Graphite is a model system for the study of three-dimensional electrons and holes in the magnetic quantum limit, in which the charges are confined to the lowest Landau levels. We report magneto-transport measurements in pulsed magnetic fields up to 60 T, which resolve the collapse of two charge density wave states in two, electron and hole, Landau levels at 52.3 and 54.2 T, respectively. We report evidence for a commensurate charge density wave at 47.1 T in the electron Landau level, and discuss the likely nature of the density wave instabilities over the full field range. The theoretical modeling of our results predicts that the ultraquantum limit is entered above 73.5 T. This state is an insulator, and we discuss its correspondence to the "metallic" state reported earlier. We propose that this (interaction-induced) insulating phase supports surface states that carry no charge or spin within the planes, but does, however, support charge transport out of plane.
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Affiliation(s)
- F Arnold
- Royal Holloway, University of London, TW20 0EX Egham, United Kingdom
| | - A Isidori
- Royal Holloway, University of London, TW20 0EX Egham, United Kingdom
| | - E Kampert
- Hochfeld-Magnetlabor Dresden (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany
| | - B Yager
- Royal Holloway, University of London, TW20 0EX Egham, United Kingdom
| | - M Eschrig
- Royal Holloway, University of London, TW20 0EX Egham, United Kingdom
| | - J Saunders
- Royal Holloway, University of London, TW20 0EX Egham, United Kingdom
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19
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Arnold F, Patch D, Yu D, Westbrook RH. When banding fails; investigation hails. Gut 2017; 66:322. [PMID: 27340193 DOI: 10.1136/gutjnl-2016-311515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Revised: 06/06/2016] [Accepted: 06/07/2016] [Indexed: 12/08/2022]
Affiliation(s)
| | - D Patch
- Hepatology Department, Royal Free Hospital, London, UK
| | - D Yu
- Radiology Department, Royal Free Hospital, London, UK
| | - R H Westbrook
- Hepatology Department, Royal Free Hospital, London, UK
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20
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Wunderink HF, van der Meijden E, van der Blij-de Brouwer CS, Mallat MJK, Haasnoot GW, van Zwet EW, Claas ECJ, de Fijter JW, Kroes ACM, Arnold F, Touzé A, Claas FHJ, Rotmans JI, Feltkamp MCW. Pretransplantation Donor-Recipient Pair Seroreactivity Against BK Polyomavirus Predicts Viremia and Nephropathy After Kidney Transplantation. Am J Transplant 2017; 17:161-172. [PMID: 27251361 DOI: 10.1111/ajt.13880] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 05/11/2016] [Accepted: 05/18/2016] [Indexed: 01/25/2023]
Abstract
Kidney transplant donors are not currently implicated in predicting BK polyomavirus (BKPyV) infection in kidney transplant recipients. It has been postulated, however, that BKPyV infection originates from the kidney allograft. Because BKPyV seroreactivity correlates with BKPyV replication and thus might mirror the infectious load, we investigated whether BKPyV seroreactivity of the donor predicts viremia and BKPyV-associated nephropathy (BKPyVAN) in the recipient. In a retrospective cohort of 407 living kidney donor-recipient pairs, pretransplantation donor and recipient sera were tested for BKPyV IgG levels and correlated with the occurrence of recipient BKPyV viremia and BKPyVAN within 1 year after transplantation. Donor BKPyV IgG level was strongly associated with BKPyV viremia and BKPyVAN (p < 0.001), whereas recipient BKPyV seroreactivity showed a nonsignificant inverse trend. Pairing of high-BKPyV-seroreactive donors with low-seroreactive recipients resulted in a 10-fold increased risk of BKPyV viremia (hazard ratio 10.1, 95% CI 3.5-29.0, p < 0.001). In multivariate analysis, donor BKPyV seroreactivity was the strongest pretransplantation factor associated with viremia (p < 0.001) and BKPyVAN (p = 0.007). The proportional relationship between donor BKPyV seroreactivity and recipient infection suggests that donor BKPyV seroreactivity reflects the infectious load of the kidney allograft and calls for the use of pretransplantation BKPyV serological testing of (potential) donors and recipients.
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Affiliation(s)
- H F Wunderink
- Department of Medical Microbiology, Leiden University Medical Center, Leiden, the Netherlands
| | - E van der Meijden
- Department of Medical Microbiology, Leiden University Medical Center, Leiden, the Netherlands
| | | | - M J K Mallat
- Department of Nephrology, Leiden University Medical Center, Leiden, the Netherlands
| | - G W Haasnoot
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands
| | - E W van Zwet
- Department of Medical Statistics and Bioinformatics, Leiden University Medical Center, Leiden, the Netherlands
| | - E C J Claas
- Department of Medical Microbiology, Leiden University Medical Center, Leiden, the Netherlands
| | - J W de Fijter
- Department of Nephrology, Leiden University Medical Center, Leiden, the Netherlands
| | - A C M Kroes
- Department of Medical Microbiology, Leiden University Medical Center, Leiden, the Netherlands
| | - F Arnold
- UMR INRA 1282 ISP Université François Rabelais, Tours, France
| | - A Touzé
- UMR INRA 1282 ISP Université François Rabelais, Tours, France
| | - F H J Claas
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, the Netherlands
| | - J I Rotmans
- Department of Nephrology, Leiden University Medical Center, Leiden, the Netherlands
| | - M C W Feltkamp
- Department of Medical Microbiology, Leiden University Medical Center, Leiden, the Netherlands
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21
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Arnold F, Naumann M, Wu SC, Sun Y, Schmidt M, Borrmann H, Felser C, Yan B, Hassinger E. Chiral Weyl Pockets and Fermi Surface Topology of the Weyl Semimetal TaAs. Phys Rev Lett 2016; 117:146401. [PMID: 27740795 DOI: 10.1103/physrevlett.117.146401] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Indexed: 06/06/2023]
Abstract
Tantalum arsenide is a member of the noncentrosymmetric monopnictides, which are putative Weyl semimetals. In these materials, three-dimensional chiral massless quasiparticles, the so-called Weyl fermions, are predicted to induce novel quantum mechanical phenomena, such as the chiral anomaly and topological surface states. However, their chirality is only well defined if the Fermi level is close enough to the Weyl points that separate Fermi surface pockets of opposite chirality exist. In this Letter, we present the bulk Fermi surface topology of high quality single crystals of TaAs, as determined by angle-dependent Shubnikov-de Haas and de Haas-van Alphen measurements combined with ab initio band-structure calculations. Quantum oscillations originating from three different types of Fermi surface pockets were found in magnetization, magnetic torque, and magnetoresistance measurements performed in magnetic fields up to 14 T and temperatures down to 1.8 K. Of these Fermi pockets, two are pairs of topologically nontrivial electron pockets around the Weyl points and one is a trivial hole pocket. Unlike the other members of the noncentrosymmetric monopnictides, TaAs is the first Weyl semimetal candidate with the Fermi energy sufficiently close to both types of Weyl points to generate chiral quasiparticles at the Fermi surface.
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Affiliation(s)
- F Arnold
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - M Naumann
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - S-C Wu
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Y Sun
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - M Schmidt
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - H Borrmann
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - C Felser
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - B Yan
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
- Max Planck Institute for Physics of Complex Systems, 01187 Dresden, Germany
| | - E Hassinger
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
- Physik-Department, Technische Universität München, 85748 Garching, Germany
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Thierschmann H, Sánchez R, Sothmann B, Arnold F, Heyn C, Hansen W, Buhmann H, Molenkamp LW. Three-terminal energy harvester with coupled quantum dots. Nat Nanotechnol 2015; 10:854-8. [PMID: 26280407 DOI: 10.1038/nnano.2015.176] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 07/08/2015] [Indexed: 05/11/2023]
Abstract
Rectification of thermal fluctuations in mesoscopic conductors is the key idea behind recent attempts to build nanoscale thermoelectric energy harvesters to convert heat into useful electric power. So far, most concepts have made use of the Seebeck effect in a two-terminal geometry, where heat and charge are both carried by the same particles. Here, we experimentally demonstrate the working principle of a new kind of energy harvester, proposed recently, using two capacitively coupled quantum dots. We show that, due to the novel three-terminal design of our device, which spatially separates the heat reservoir from the conductor circuit, the directions of charge and heat flow become decoupled. This enables us to manipulate the direction of the generated charge current by means of external gate voltages while leaving the direction of heat flow unaffected. Our results pave the way for a new generation of multi-terminal nanoscale heat engines.
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Affiliation(s)
- Holger Thierschmann
- Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, Würzburg D-97074, Germany
| | - Rafael Sánchez
- Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, Madrid 28049, Spain
| | - Björn Sothmann
- Département de Physique Théorique, Université de Genève, Genève 4 CH-1211, Switzerland
| | - Fabian Arnold
- Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, Würzburg D-97074, Germany
| | - Christian Heyn
- Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, Hamburg D-20355, Germany
| | - Wolfgang Hansen
- Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, Hamburg D-20355, Germany
| | - Hartmut Buhmann
- Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, Würzburg D-97074, Germany
| | - Laurens W Molenkamp
- Physikalisches Institut (EP3), Universität Würzburg, Am Hubland, Würzburg D-97074, Germany
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Vassal G, Schrappe M, Pritchard-Jones K, Arnold F, Basset L, Biondi A, Bode G, Eggert A, Hjorth L, Kamerić L, Karner S, Kearns P, Kienesberger A, Kowalczyk J, Lack P, Perilongo G, Sullivan R, Tsirou A, Kamerić N, Essiaf S, Ladenstein R. 1407 The European Strategic Plan for children and adolescents with cancer. Eur J Cancer 2015. [DOI: 10.1016/s0959-8049(16)30578-0] [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: 10/22/2022]
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Abstract
A theory is presented supporting a geometrical explanation for physiological height vertigo being a distance vertigo through visual destabilization of postural balance when the distance between the eyes and visible stationary contrasts becomes critically large. Physiological and posturographic data obtained under natural height vertigo conditions are consistent with this hypothesis.
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Albajar F, Aiello G, Alberti S, Arnold F, Avramidis K, Bader M, Batista R, Bertizzolo R, Bonicelli T, Braunmueller F, Brescan C, Bruschi A, von Burg B, Camino K, Carannante G, Casarin V, Castillo A, Cauvard F, Cavalieri C, Cavinato M, Chavan R, Chelis J, Cismondi F, Combescure D, Darbos C, Farina D, Fasel D, Figini L, Gagliardi M, Gandini F, Gantenbein G, Gassmann T, Gessner R, Goodman T, Gracia V, Grossetti G, Heemskerk C, Henderson M, Hermann V, Hogge J, Illy S, Ioannidis Z, Jelonnek J, Jin J, Kasparek W, Koning J, Krause A, Landis J, Latsas G, Li F, Mazzocchi F, Meier A, Moro A, Nousiainen R, Purohit D, Nowak S, Omori T, van Oosterhout J, Pacheco J, Pagonakis I, Platania P, Poli E, Preis A, Ronden D, Rozier Y, Rzesnicki T, Saibene G, Sanchez F, Sartori F, Sauter O, Scherer T, Schlatter C, Schreck S, Serikov A, Siravo U, Sozzi C, Spaeh P, Spichiger A, Strauss D, Takahashi K, Thumm M, Tigelis I, Vaccaro A, Vomvoridis J, Tran M, Weinhorst B. Status of Europe’s contribution to the ITER EC system. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20158704004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Arnold F, DeMallie I, Florence L, Kashinski DO. Method for collecting thermocouple data via secured shell over a wireless local area network in real time. Rev Sci Instrum 2015; 86:035112. [PMID: 25832280 DOI: 10.1063/1.4915490] [Citation(s) in RCA: 1] [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: 06/04/2023]
Abstract
This manuscript addresses the design, hardware details, construction, and programming of an apparatus allowing an experimenter to monitor and record high-temperature thermocouple measurements of dynamic systems in real time. The apparatus uses wireless network technology to bridge the gap between a dynamic (moving) sample frame and the static laboratory frame. Our design is a custom solution applied to samples that rotate through large angular displacements where hard-wired and typical slip-ring solutions are not practical because of noise considerations. The apparatus consists of a Raspberry PI mini-Linux computer, an Arduino micro-controller, an Ocean Controls thermocouple multiplexer shield, and k-type thermocouples.
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Affiliation(s)
- F Arnold
- Photonics Research Center, United States Military Academy, West Point, New York 10996, USA
| | - I DeMallie
- Photonics Research Center, United States Military Academy, West Point, New York 10996, USA
| | - L Florence
- Photonics Research Center, United States Military Academy, West Point, New York 10996, USA
| | - D O Kashinski
- Photonics Research Center, United States Military Academy, West Point, New York 10996, USA
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Grange F, Woronoff AS, Bera R, Colomb M, Lavole B, Fournier E, Arnold F, Barbe C. Efficacy of a general practitioner training campaign for early detection of melanoma in France. Br J Dermatol 2015; 170:123-9. [PMID: 23937244 DOI: 10.1111/bjd.12585] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/05/2013] [Indexed: 11/26/2022]
Abstract
BACKGROUND To date, no strategy for improving early diagnosis of melanoma has been evaluated on a population basis in France. OBJECTIVE To evaluate the efficacy of a general practitioner (GP) awareness and training campaign in a pilot French geographical region (Champagne-Ardenne), including 1.34 million inhabitants, 1241 GPs, 56 dermatologists and a population-based melanoma registry. METHODS All GPs received repeated awareness postal mailings in 2008 and 398 (32.1%) attended training sessions organized by 27 dermatologists. The pre- (2005-7) and post-campaign (2009-11) periods were compared for the following: primary endpoint - the world-standardized incidence of very thick melanomas (VTM) (Breslow thickness ≥ 3 mm); secondary endpoints--the mean Breslow thickness; the proportions of VTM and of thin (< 1 mm) melanomas among invasive cases; and the ratio of in situ/all melanoma cases. Similar measures were performed in the control area of Doubs/Belfort territory (655,000 ha), where no similar campaign was carried out. RESULTS The incidence of VTM decreased from 1.07 to 0.71 per 100 000 habitants per year (P = 0.01), the mean Breslow thickness from 1.95 to 1.68 mm (P = 0.06) and the proportion of VTM from 19.2% to 12.8% (P = 0.01). The proportion of thin and in situ melanomas increased from 50.9% to 57.4% (P = 0.05) and from 20.1% to 28.2% (P = 0.001), respectively. No significant variation was observed in Doubs/Belfort territory. CONCLUSION These results strongly support the efficacy of such a campaign targeting GPs and provide a rationale for a larger public health campaign in France, including training of GPs by dermatologists and encouraging patients to ask their GP for a systematic skin examination.
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Affiliation(s)
- F Grange
- Service de Dermatologie, Hôpital Robert Debré, Reims, France
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Arnold F, Margraf D, Hoffmann O, Dehn-Rotfelser KV, Funke I, Loewe R, Burges A, Beer D, Werner J, Mayer B. Tumor biology driven treatment selection in primary ovarian cancer. Geburtshilfe Frauenheilkd 2014. [DOI: 10.1055/s-0034-1388483] [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: 10/24/2022] Open
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Savage P, Sharkey R, Kua T, Schofield L, Richardson D, Panchmatia N, Papanastasopoulos P, Williams M, Falconer A, Power D, Arnold F, Ulbricht C. Malignant spinal cord compression: NICE guidance, improvements and challenges. QJM 2014; 107:277-82. [PMID: 24336849 DOI: 10.1093/qjmed/hct244] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND AND AIM Malignant spinal cord compression (mSCC) is one of the most serious complications of cancer. Recent NICE guidance has aimed to improve patient pathways and outcomes for patients with mSCC. We have examined the current presentations, management and outcomes for patients with mSCC in West London following the implementation of the NICE guidance. MATERIALS AND METHODS The electronic records and clinical notes were reviewed for all patients assessed for confirmed or potential mSCC at Charing Cross Hospital in 2012. Details on the number of referrals, the proportion with confirmed mSCC, the cancer diagnosis, treatment and outcome were analysed. RESULTS 191 patients were reviewed with 127 (66%) cases of confirmed mSCC. The commonest tumour types were prostate cancer (26 cases), lung cancer (26), breast cancer (21) and kidney cancer (15). 21% of the patients had no previous cancer diagnosis; mSCC was their presenting diagnostic event. Radiotherapy was the predominant management, 24% of the patients had first line surgical treatment. At presentation 62% of patients were either chair or bed bound. Treatment brought important mobility benefits to all patients groups with 20% of the initially chair or bed bound patients leaving the hospital with independent mobility. CONCLUSION Enhanced patients pathways with ease of access, rapid assessment and prompt treatment can improve outcomes. Despite these pathways many patients still present with gross motor impairment and over 20% have no previous diagnosis of cancer. Ongoing work to maintain awareness for patients and primary care of the diagnosis and emergency pathways is essential to optimize outcomes.
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Affiliation(s)
- P Savage
- Consultant in Medical Oncology, Imperial Hospitals NHS Trust, Charing Cross Hospital, London W6 8RF, UK.
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Grange F, Woronoff A, Bera R, Colomb M, Lavole B, Fournier E, Arnold F, Barbe C. Efficacité d’une campagne de formation des médecins généralistes au diagnostic précoce du mélanome : étude pilote en Champagne-Ardenne. Ann Dermatol Venereol 2013. [DOI: 10.1016/j.annder.2013.09.094] [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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31
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Liapikou A, Polverino E, Cilloniz C, Peyrani P, Ramirez J, Menendez R, Torres A, Nakamatsu R, Arnold F, Allen M, Broch G, Bordon J, Gross P, Weiss K, Legnani D, Bodi M, Porras J, Torres A, Lode H, Roig J, Benchetrit G, Gonzalez J, Videla A, Corral J, Martinez J, Rodriguez E, Rodriguez M, Victorio C, Levy G, Arteta F, Fuenzalida AD, Parada M, Luna J. A Worldwide Perspective of Nursing Home-Acquired Pneumonia Compared With Community-Acquired Pneumonia. Respir Care 2013; 59:1078-85. [DOI: 10.4187/respcare.02788] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [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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32
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Arnold F, Yager B, Kampert E, Putzke C, Nyéki J, Saunders J. Spear-anvil point-contact spectroscopy in pulsed magnetic fields. Rev Sci Instrum 2013; 84:113901. [PMID: 24289405 DOI: 10.1063/1.4828657] [Citation(s) in RCA: 1] [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: 06/02/2023]
Abstract
We describe a new design and experimental technique for point-contact spectroscopy in non-destructive pulsed magnetic fields up to 70 T. Point-contact spectroscopy uses a quasi-dc four-point measurement of the current and voltage across a spear-anvil point-contact. The contact resistance could be adjusted over three orders of magnitude by a built-in fine pitch threaded screw. The first measurements using this set-up were performed on both single-crystalline and exfoliated graphite samples in a 150 ms, pulse length 70 T coil at 4.2 K and reproduced the well known point-contact spectrum of graphite and showed evidence for a developing high field excitation above 35 T, the onset field of the charge-density wave instability in graphite.
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Affiliation(s)
- F Arnold
- Royal Holloway, University of London, Egham TW20 0EX, United Kingdom
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Artunc F, Azaz A, Haenisch N, Roerden M, Cordts T, Arnold F, Kerjaschki D, Ruegg M, Hall M, Huber T, Grahammer F, Mordasini D, Maillard M, Hummler E, Burnier M, Vogt B. Novel epithelial cell models. Nephrol Dial Transplant 2013. [DOI: 10.1093/ndt/gft170] [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: 11/13/2022] Open
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Samimi M, Touzé A, Laude H, Le Bidre E, Arnold F, Carpentier A, Gardair C, Carlotti A, Maubec E, Dupin N, Aubin F, Avril MF, Rozenberg F, Avenel-Audran M, Guyetant S, Lorette G, Machet L, Coursaget P. Vitamin D deficiency is associated with greater tumor size and poorer outcome in Merkel cell carcinoma patients. J Eur Acad Dermatol Venereol 2013; 28:298-308. [PMID: 23368852 DOI: 10.1111/jdv.12101] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Accepted: 12/20/2012] [Indexed: 12/31/2022]
Abstract
BACKGROUND Merkel cell polyomavirus has been recognized to be associated with Merkel cell carcinoma (MCC), but the evolution of this cancer probably depends on various factors. Vitamin D deficiency, defined by serum 25-hydroxyvitamin D levels <50 nmol/L, seems to influence cancer behavior and progression, but has never been assessed in MCC patients. OBJECTIVES First, to evaluate whether vitamin D deficiency was associated with tumor characteristics and prognosis in a cohort of MCC patients. Second, to assess expression of the vitamin D receptor (VDR) in MCC tumors. METHODS Clinical findings, Merkel cell polyomavirus markers and vitamin D status were assessed in a cohort of French MCC patients. The study was limited to the 89 patients for whom the serum sample had been collected within 3 years after the diagnosis of MCC. Correlation between vitamin D deficiency and MCC characteristics and outcome were determined in regression analyses. VDR expression in MCC tumours was assessed by immunohistochemistry. RESULTS Vitamin D deficiency was noted in 65.1% of the patients and was independently associated with greater tumor size at diagnosis (P = 0.006) and with metastasis recurrence (HR, 2.89; 95% CI, 1.03 to 8.13; P = 0.043), but not with death from MCC, although there was a trend (HR, 5.28; 95% CI, 0.75 to 36.96; P = 0.093). VDR was found to be strongly expressed in all 28 MCC tumor specimens investigated. CONCLUSION The association between vitamin D deficiency and MCC characteristics and outcome, together with detection of the VDR in MCC cells, suggest that vitamin D could influence the biology of MCC.
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Affiliation(s)
- M Samimi
- INRA ISP, UMR 1282, Tours, France; Université François Rabelais, Tours, France; CHRU de Tours, Service de Dermatologie, Tours, France
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Wiemken T, Peyrani P, Bryant K, Kelley RR, Summersgill J, Arnold F, Carrico R, McKinney WP, Jonsson C, Carrico K, Ramirez J. Incidence of respiratory viruses in patients with community-acquired pneumonia admitted to the intensive care unit: results from the Severe Influenza Pneumonia Surveillance (SIPS) project. Eur J Clin Microbiol Infect Dis 2012; 32:705-10. [PMID: 23274861 DOI: 10.1007/s10096-012-1802-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2012] [Accepted: 12/06/2012] [Indexed: 11/30/2022]
Abstract
Few patients with community-acquired pneumonia (CAP) require admission to the intensive care unit (ICU-CAP). However, they represent the most severe form of the disease. An understanding of the etiologic agents of ICU-CAP may lead to better treatment decisions and patient outcomes. The objective of this study was to determine the incidence of respiratory viruses in patients with ICU-CAP. This was an observational study conducted in six Kentucky hospitals from December 2008 through October 2011. A case of ICU-CAP was defined as a patient admitted to an ICU with the diagnosis of CAP. The Luminex xTAG multiplex polymerase chain reaction (PCR) assay was used for viral identification. A total of 468 adult and pediatric patients with ICU-CAP were enrolled in the study. A total of 92 adult patients (23 %) and 14 pediatric patients (19 %) had a respiratory virus identified. Influenza was the most common virus identified in adults and the second most common in pediatric patients. This study suggests that respiratory viruses may be common etiologic agents of pneumonia in patients with ICU-CAP. The Centers for Disease Control and Prevention (CDC) recommend empiric anti-influenza therapy during the winter for hospitalized patients with CAP. This study supports this recommendation in patients with ICU-CAP.
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Affiliation(s)
- T Wiemken
- Division of Infectious Diseases, University of Louisville, Louisville, KY, USA.
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Grange F, Barbe C, Mas L, Granel‐Brocard F, Lipsker D, Aubin F, Velten M, Dalac S, Truchetet F, Michel C, Mitschler A, Arnoult G, Buemi A, Dalle S, Reuter G, Bernard P, Woronoff A, Arnold F. The role of general practitioners in diagnosis of cutaneous melanoma: a population‐based study in France. Br J Dermatol 2012; 167:1351-9. [DOI: 10.1111/j.1365-2133.2012.11178.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- F. Grange
- Service de Dermatologie, Hôpital Robert Debré, Université de Reims‐Champagne‐Ardenne, avenue du général Koenig, 51092 Reims Cedex, France
| | - C. Barbe
- Unité d’Aide Méthodologique, Hôpital Maison Blanche, Reims, France
| | - L. Mas
- Service de Dermatologie, Hôpital Robert Debré, Université de Reims‐Champagne‐Ardenne, avenue du général Koenig, 51092 Reims Cedex, France
| | - F. Granel‐Brocard
- Service de Dermatologie, Hôpital Brabois, Vandoeuvre les Nancy, France
| | - D. Lipsker
- Clinique Dermatologique, Hôpital Civil, Strasbourg, France
| | - F. Aubin
- Service de Dermatologie, Hôpital Saint Jacques, Besançon, France
| | - M. Velten
- Registre des Cancers du Bas‐Rhin and Réseau Français des Registres de Cancers FRANCIM, Strasbourg, France
| | - S. Dalac
- Service de Dermatologie, Hôpital du Bocage, Dijon, France
| | - F. Truchetet
- Service de Dermatologie, Hôpital Beauregard, Thionville, France
| | - C. Michel
- Service de Dermatologie, Hôpital du Moenschberg, Mulhouse, France
| | - A. Mitschler
- Service de Dermatologie, Hôpital Louis Pasteur, Colmar, France
| | - G. Arnoult
- Centre de Recherche et d’Investigation Clinique, Hôpital Maison Blanche, Reims, France
| | - A. Buemi
- Registre des Cancers du Haut‐Rhin and Réseau Français des Registres de Cancers FRANCIM, Mulhouse, France
| | - S. Dalle
- Service de Dermatologie, Hôpital de l’Hôtel‐Dieu, Lyon, France
| | - G. Reuter
- Cabinet de Dermatologie, Strasbourg, France
| | - P. Bernard
- Service de Dermatologie, Hôpital Robert Debré, Université de Reims‐Champagne‐Ardenne, avenue du général Koenig, 51092 Reims Cedex, France
| | - A.S. Woronoff
- CHU de Besançon and Réseau Français des Registres de Cancers FRANCIM; Registre des Tumeurs du Doubs, Besançon, France
| | - F. Arnold
- Association Départementale des Professions de Santé pour le Dépistage des Cancers, Reims, France
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Arnold F, Pirjola L, Rönkkö T, Reichl U, Schlager H, Lähde T, Heikkilä J, Keskinen J. First online measurements of sulfuric acid gas in modern heavy-duty diesel engine exhaust: implications for nanoparticle formation. Environ Sci Technol 2012; 46:11227-11234. [PMID: 23035617 DOI: 10.1021/es302432s] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
To mitigate the diesel particle pollution problem, diesel vehicles are fitted with modern exhaust after-treatment systems (ATS), which efficiently remove engine-generated primary particles (soot and ash) and gaseous hydrocarbons. Unfortunately, ATS can promote formation of low-vapor-pressure gases, which may undergo nucleation and condensation leading to formation of nucleation particles (NUP). The chemical nature and formation mechanism of these particles are only poorly explored. Using a novel mass spectrometric method, online measurements of low-vapor-pressure gases were performed for exhaust of a modern heavy-duty diesel engine operated with modern ATS and combusting low and ultralow sulfur fuels and also biofuel. It was observed that the gaseous sulfuric acid (GSA) concentration varied strongly, although engine operation was stable. However, the exhaust GSA was observed to be affected by fuel sulfur level, exhaust after-treatment, and driving conditions. Significant GSA concentrations were measured also when biofuel was used, indicating that GSA can be originated also from lubricant oil sulfur. Furthermore, accompanying NUP measurements and NUP model simulations were performed. We found that the exhaust GSA promotes NUP formation, but also organic (acidic) precursor gases can have a role. The model results indicate that that the measured GSA concentration alone is not high enough to grow the particles to the detected sizes.
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Affiliation(s)
- F Arnold
- Max Planck Institute for Nuclear Physics (MPIK), P.O. Box 103980, D-69029 Heidelberg, Germany.
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Björn LG, Kopp E, Herrmann U, Eberhardt P, Dickinson PHG, Mackinnon DJ, Arnold F, Witt G, Lundin A, Jenkins DB. Heavy ionospheric ions in the formation process of noctilucent clouds. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/jd090id05p07985] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Agius S, Iorga R, Hussein A, Arnold F, Wilson M. Bus versus Pedestrian in London. J Neurol Surg A Cent Eur Neurosurg 2012. [DOI: 10.1055/s-0032-1316213] [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: 10/28/2022]
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Riquelme R, Jiménez P, Videla AJ, Lopez H, Chalmers J, Singanayagam A, Riquelme M, Peyrani P, Wiemken T, Arbo G, Benchetrit G, Rioseco ML, Ayesu K, Klotchko A, Marzoratti L, Raya M, Figueroa S, Saavedra F, Pryluka D, Inzunza C, Torres A, Alvare P, Fernandez P, Barros M, Gomez Y, Contreras C, Rello J, Bordon J, Feldman C, Arnold F, Nakamatsu R, Riquelme J, Blasi F, Aliberti S, Cosentini R, Lopardo G, Gnoni M, Welte T, Saad M, Guardiola J, Ramirez J. Predicting mortality in hospitalized patients with 2009 H1N1 influenza pneumonia. Int J Tuberc Lung Dis 2011; 15:542-6. [PMID: 21396216 DOI: 10.5588/ijtld.10.0539] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Community-acquired pneumonia (CAP) severity scores can identify patients at low risk for mortality who may be suitable for ambulatory care. Here, we follow the clinical course of hospitalized patients with CAP due to 2009 H1N1 influenza. OBJECTIVE To evaluate the role of CAP severity scores as predictors of mortality. METHODS This was a secondary data analysis of patients hospitalized with CAP due to 2009 H1N1 influenza confirmed by reverse transcriptase polymerase chain reaction enrolled in the CAPO (Community-Acquired Pneumonia Organization) international cohort study. CAP severity scores PSI (Pneumonia Severity Index), CURB-65 (confusion, urea, respiratory rate, blood pressure, age ≥ 65 years) and CRB-65 (confusion, respiratory rate, blood pressure, age ≥ 65 years) were calculated. Actual and predicted mortality rates were compared. A total of 37 predictor variables were evaluated to define those associated with mortality. RESULTS Data from 250 patients with CAP due to 2009 H1N1 influenza were analyzed. Patients with low predicted mortality rates (0-1.5%) had actual mortality rates ranging from 2.6% to 17.5%. Obesity and wheezing were the only novel variables associated with mortality. CONCLUSIONS The decision to hospitalize a patient with CAP due to 2009 H1N1 influenza should not be based on current CAP severity scores, as they underestimate mortality rates in a significant number of patients. Patients with obesity or wheezing should be considered at an increased risk for mortality.
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Affiliation(s)
- R Riquelme
- Puerto Montt Hospital, Puerto Montt, Chile
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Gasser P, Arnold F, Peno-Mazzarino L, Bouzoud D, Luu MT, Lati E, Mercier M. Glycation induction and antiglycation activity of skin care ingredients on living human skin explants. Int J Cosmet Sci 2011; 33:366-70. [DOI: 10.1111/j.1468-2494.2011.00640.x] [Citation(s) in RCA: 19] [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: 11/27/2022]
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Harris FW, Hsu SLC, Lee CJ, Lee BS, Arnold F, Cheng SZD. Organo-Soluble, Segmented Rigid-Rod Polyimides: Synthesis and Properties. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-227-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTSeveral segmented, rigid-rod polyimides have been prepared that are soluble in organic solvents in their fully imidized form. The polymers were prepared from commercial dianhydrides and 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl (TFMB). Their intrinsic viscosities ranged from 1.0 to 4.9 dL/g. Tough, colorless films could be cast from m-cresol solutions at 100°C. The polymers had glass transition temperatures (Tgs) above 275°C and displayed outstanding thermal and thermo-oxidative stability. Fibers were prepared from the 3,3′,4,4′-tetracarboxybiphenyl dianhydride (BPDA) based polymers that had moduli of 130 GPa and tensile strengths of 3.2 GPa. The thermal expansion coefficients and dielectric constants of thin films (20–25 μm) of the polymers were as low as −2.40×10−6 and 2.5, respectively.
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Jurkat T, Voigt C, Arnold F, Schlager H, Aufmhoff H, Schmale J, Schneider J, Lichtenstern M, Dörnbrack A. Airborne stratospheric ITCIMS measurements of SO2, HCl, and HNO3in the aged plume of volcano Kasatochi. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2010jd013890] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Schmale J, Schneider J, Jurkat T, Voigt C, Kalesse H, Rautenhaus M, Lichtenstern M, Schlager H, Ancellet G, Arnold F, Gerding M, Mattis I, Wendisch M, Borrmann S. Aerosol layers from the 2008 eruptions of Mount Okmok and Mount Kasatochi: In situ upper troposphere and lower stratosphere measurements of sulfate and organics over Europe. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd013628] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kratzer W, Walcher T, Arnold F, Akinli AS, Mason RA, Denzer C, Böhm B, Imhof A, Hänle MM. Gallstone prevalence and risk factors for gallstone disease in an urban population of children and adolescents. Z Gastroenterol 2010; 48:683-7. [PMID: 20517806 DOI: 10.1055/s-0028-1109957] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
BACKGROUND At present only a few sonography-based studies have assessed gallstone prevalence and associated risk factors in children and adolescents in randomly selected urban population samples. The aim of the present study was to analyze the prevalence of cholecystolithiasis and associated risk factors in children and adolescents. METHODS From a randomly selected urban population sample a total of 307 children and adolescents (157 girls, 150 boys; age 12 - 18 years, mean age 15.1 +/- 2.0 years) were studied using ultrasonography, standardized questionnaires and blood samples. RESULTS Three adolescents (one girl, two boys), corresponding to a prevalence of 1.0 %, showed gallstones. One 14-year-old girl and one 17-year-old boy were overweight using Cole's classification. A positive family history and female gender could not be confirmed as risk factors. CONCLUSION Obesity appears to be a risk factor in the development of gallstones in childhood and adolescence.
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Affiliation(s)
- W Kratzer
- Zentrum für Innere Medizin, Klinik für Innere Medizin I, Universität Ulm, Ulm, Germany.
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Griffin AT, Peyrani P, Wiemken T, Arnold F. Macrolides versus quinolones in Legionella pneumonia: results from the Community-Acquired Pneumonia Organization international study. Int J Tuberc Lung Dis 2010; 14:495-499. [PMID: 20202309] [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: 05/28/2023] Open
Abstract
BACKGROUND Data supporting a quinolone or a macrolide as preferred therapy for community-acquired pneumonia (CAP) due to Legionella pneumophila are not firmly established. Some literature suggests a benefit of quinolones over macrolides. OBJECTIVE To compare time to clinical stability (TCS) and length of hospital stay (LOS) in patients with Legionella pneumonia who were treated with levofloxacin (LVX) compared to those treated with newer macrolides. DESIGN An analysis of patients with Legionnaires' disease from the Community-Acquired Pneumonia Organization database was performed. Patients were diagnosed with CAP using radiographic and clinical criteria, while Legionella was detected by urinary antigen or sputum culture. All patients received a macrolide (azithromycin or clarithromycin) or LVX. TCS was defined as the time from hospital admission to candidacy for switch to oral therapy. RESULTS A total of 39 patients were included for analysis. The mean TCS for the macrolide group was 5.1 days vs. 4.3 days for the LVX group (P = 0.43). The mean LOS for the macrolide group was 12.7 days vs. 8.9 days for the quinolone group (P = 0.10). CONCLUSION LOS and TCS were not statistically different between the macrolide and the LVX groups in treating CAP due to Legionella, despite trends in both outcomes favoring LVX.
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Affiliation(s)
- A T Griffin
- Department of Medicine, School of Medicine, University of Louisville, Louisville, Kentucky 40202, USA.
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Burgert C, Bradley S, Arnold F, Eckert E. Improving estimates of malaria intervention coverage from household surveys using GPS data. Int J Infect Dis 2010. [DOI: 10.1016/j.ijid.2010.02.1731] [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] Open
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Borchert D, Schuler A, Muche R, Haenle MM, Akinli AS, Arnold F, Kratzer W, Pauls S. Comparison of panorama ultrasonography, conventional B-mode ultrasonography, and computed tomography for measuring liver size. Ultraschall Med 2010; 31:31-36. [PMID: 19266425 DOI: 10.1055/s-2008-1109309] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
PURPOSE The objective of the present study is to compare the utility of extended field-of-view ultrasonography and conventional B-mode ultrasonography for determining liver size. MATERIALS AND METHODS The liver size in the medioclavicular line (MCL) was determined in 104 inpatients (females: n = 47; males: n = 57) using both ultrasound methods (Philips HDI 5000). The liver size measured in computed tomography (CT; MX 8000 IDT, Philips) served as the gold standard. The body mass index (BMI), ultrasound scanning conditions, and hepatomegaly identified by CT were evaluated as possible factors affecting the measurement accuracy of the sonographic methods. RESULTS The standard deviation of the differences between the measured pairs of values shows less dispersion in B-mode ultrasonography (18.7 mm) than panorama ultrasonography (20.8 mm). The mean value of differences between the measured pairs (bias) in the ultrasonographic methods compared to CT is considerably higher in panorama sonography (15.3 mm; SD = 20.8) than in B-mode ultrasonography (0.27 mm; SD = 18.7). A paired t-test of the mean values shows a significant difference between the ultrasonographic methods (p < 0.0001). In diagnosing or excluding hepatomegaly, B-mode sonography is consistent with CT findings in 84 (80.8 %) of 104 patients and panorama ultrasonography is consistent with CT findings in 77 (74.0 %) of 104 patients. Ultrasonographic methods show moderate agreement with each other (Kappa = 0.4265). Higher BMI and limited scanning conditions lead to an increase in the mean difference of measured pairs of values (bias) as well as to an increase in standard deviation of the differences (dispersion). CONCLUSION The determination of liver size in the medioclavicular line using panorama ultrasonography often leads to the false-positive diagnosis of hepatomegaly. Therefore, the method should not be recommended for routine diagnostic scans. In cases of significant hepatomegaly, however, panorama ultrasonography offers superior visualization compared to conventional B-mode ultrasonography.
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Affiliation(s)
- D Borchert
- Zentrum für Innere Medizin, Klinik für Innere Medizin I, Universitätsklinikum Ulm
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Kratzer W, Akinli AS, Bommer M, Arnold F, Eggink S, Imhof A, Mason RA, Klaus J, Schuler A, Boehm BO, Haenle MM. Prevalence and risk factors of focal sparing in hepatic steatosis. Ultraschall Med 2010; 31:37-42. [PMID: 20157869 DOI: 10.1055/s-0028-1109894] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [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
PURPOSE The prevalence, localization and potential risk factors for focal sparing were prospectively assessed in subjects with sonographically detectable hepatic steatosis as part of a population-based cross-sectional study. MATERIALS AND METHODS A total of 1,624 persons (n = 906 women; n = 718 men) were evaluated using ultrasonography, laboratory testing and a standardized questionnaire. The following were excluded from the analysis: subjects with reported alcohol consumption > 40 g/day (males) or > 20 g/day (females), those with known chronic hepatitis B or C infection, elevated serum transaminases (AST: m > 44 U/l, f > 33 U/l; ALT: m > 45 U/l, f > 35 U/l) and prior right nephrectomy. RESULTS The prevalence of focal sparing in patients with hepatic steatosis (grade I) was 25.6 % for men and 13.0 % for women. In patients with grade II/III disease, the prevalence was 70.9 % for men and 77.6 % for women. The most common site of focal sparing was in segment IV. The average diameter was 22.3 mm (range 7 - 84 mm). No correlation was found for postulated risk "age" (p = 0.09) or "status post cholecystectomy" (p = 0.09). Male sex (p = 0.02) and metabolic syndrome (odds ratio, 2.1; 95 % confidence interval, 1.1 - 4.1; p = 0.02) were confirmed as risk factors. CONCLUSION Sonographic evidence of focal sparing in subjects with hepatic steatosis is associated with an increased risk for metabolic syndrome and may be an easily obtained diagnostic criterion in routine clinical settings.
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Affiliation(s)
- W Kratzer
- Klinik für Innere Medizin I, Universitätsklinikum Ulm, Zentrum für Innere Medizin, Ulm, Germany.
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Malinis M, Myers J, Bordon J, Peyrani P, Kapoor R, Nakamatzu R, Lopardo G, Torres A, Feldman C, Allen M, Arnold F, Ramirez J. Clinical outcomes of HIV-infected patients hospitalized with bacterial community-acquired pneumonia. Int J Infect Dis 2010; 14:e22-7. [DOI: 10.1016/j.ijid.2009.03.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2008] [Revised: 02/10/2009] [Accepted: 03/01/2009] [Indexed: 11/30/2022] Open
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