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Delfs B, Kapsch R, Kretschmer J, Blum I, Tekin T, Brodbek L, Poppe B, Kranzer R, Burzlaff K, Poppinga D, Würfel J, Looe H. OC-0196 Determination of the beam-quality correction factors kQ for the PTW PinPoint 3D 31022 chamber. Radiother Oncol 2021. [DOI: 10.1016/s0167-8140(21)06811-0] [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: 10/20/2022]
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Fogliata A, Stravato A, Reggiori G, Tomatis S, Würfel J, Scorsetti M, Cozzi L. Collimator scatter factor: Monte Carlo and in-air measurements approaches. Radiat Oncol 2018; 13:126. [PMID: 29996873 PMCID: PMC6042423 DOI: 10.1186/s13014-018-1070-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 04/05/2018] [Accepted: 06/29/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Linac output as a function of field sizes has a phantom and a head scatter component. This last term can be measured in-air with appropriate build-up ensuring a complete electron equilibrium and the absence of the contaminant electrons. Equilibrium conditions could be achieved using a build-up cap or a mini-phantom. Monte Carlo simulations in a virtual phantom mimicking a mini-phantom were analysed with the aim of better understanding the setup conditions for measuring the collimator scatter factor that is the head scatter component of the linac output factors. METHODS Beams of 6 and 15 MV from a TrueBeam, with size from 4 × 4 to 40 × 40 cm2 were simulated in cylindrical acrylic phantoms 20 cm long, of different diameters, from 0.5 to 4 cm, with the cylinder axis coincident with the beam central axis. The PRIMO package, based on PENELOPE Monte Carlo code, was used. The phase-space files for a Varian TrueBeam linac, provided by the linac vendor, were used for the linac head simulation. Depth dose curves were analysed, and collimator scatter factors estimated at different depth in the different phantom conditions. Additionally, in-air measurements using acyrilic and brass build-up caps, as well as acrylic mini-phantom were acquired for 6 and 18 MV beams from a Varian Clinac DHX. RESULTS The depth dose curves along the cylinders were compared, showing, in each phantom, very similar curves for all analysed field sizes, proving the correctness in estimating the collimator scatter factor in the mini-phantom, provided to position the detector to a sufficient depth to exclude electron contamination. The results were confirmed by the measurements, where the acrylic build-up cap showed to be inadequate to properly estimate the collimator scatter factors, while the mini-phantom and the brass caps gave reasonable measurements. CONCLUSION A better understanding of the beam characteristics inside a virtual mini-phantom through the analysis of depth dose curves, showed the critical points of using the acrylic build-up cap, and suggested the use of the mini-phantom for the collimator scatter factor measurements in the medium-large field size range.
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Affiliation(s)
- A Fogliata
- Radiotherapy and Radiosurgery Department, Humanitas Research Hospital and Cancer Center, Milan-Rozzano, Italy.
| | - A Stravato
- Radiotherapy and Radiosurgery Department, Humanitas Research Hospital and Cancer Center, Milan-Rozzano, Italy
| | - G Reggiori
- Radiotherapy and Radiosurgery Department, Humanitas Research Hospital and Cancer Center, Milan-Rozzano, Italy
| | - S Tomatis
- Radiotherapy and Radiosurgery Department, Humanitas Research Hospital and Cancer Center, Milan-Rozzano, Italy
| | - J Würfel
- PTW-Freiburg GmbH, Freiburg, Germany
| | - M Scorsetti
- Radiotherapy and Radiosurgery Department, Humanitas Research Hospital and Cancer Center, Milan-Rozzano, Italy.,Biomedical Science Faculty, Humanitas University, Milan-Rozzano, Italy
| | - L Cozzi
- Radiotherapy and Radiosurgery Department, Humanitas Research Hospital and Cancer Center, Milan-Rozzano, Italy.,Biomedical Science Faculty, Humanitas University, Milan-Rozzano, Italy
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Rossi G, Gainey M, Thomann B, Kollefrath M, Allgaier B, Würfel J, Baltas D. EP-2237: Employing the microDiamond detector for radial dose function measurements with an 192Ir HDR source. Radiother Oncol 2018. [DOI: 10.1016/s0167-8140(18)32546-5] [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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Laeger T, Baumeier C, Würfel J, Schürmann A. FGF21 improves glucose homeostasis in diabetes-prone NZO mice. DIABETOL STOFFWECHS 2017. [DOI: 10.1055/s-0037-1601632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- T Laeger
- Deutsches Institut für Ernährungsforschung Potsdam-Rehbrücke, Nuthetal, Germany
| | - C Baumeier
- Deutsches Institut für Ernährungsforschung Potsdam-Rehbrücke, Nuthetal, Germany
| | - J Würfel
- Deutsches Institut für Ernährungsforschung Potsdam-Rehbrücke, Nuthetal, Germany
| | - A Schürmann
- Deutsches Institut für Ernährungsforschung Potsdam-Rehbrücke, Nuthetal, Germany
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Pardini M, Botzkowski D, Müller S, Vehoff J, Kuhle J, Ruberte E, Würfel J, Gass A, Valmaggia C, Tettenborn B, Putzki N, Yaldizli Ö. The association between retinal nerve fibre layer thickness and N-acetyl aspartate levels in multiple sclerosis brain normal-appearing white matter: a longitudinal study using magnetic resonance spectroscopy and optical coherence tomography. Eur J Neurol 2016; 23:1769-1774. [PMID: 27591406 DOI: 10.1111/ene.13116] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 02/08/2016] [Accepted: 06/27/2016] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND PURPOSE N-acetyl aspartate (NAA) assessed using proton magnetic resonance spectroscopy (1 H MRS) has a high pathological specificity for axonal density. Retinal nerve fibre layer thickness (RNFLT) measured by using optical coherence tomography is increasingly used as a surrogate marker of neurodegeneration in multiple sclerosis (MS). Our aim was to investigate the relation between RNFLT and NAA/creatine in brain normal-appearing white matter (NAWM), their dynamics over time and the association with clinical outcome measures in relapsing MS. T2 WM lesions served as control tissue. METHODS Forty-three MS patients underwent standardized neurological examination including the Expanded Disability Status Scale (EDSS), Multiple Sclerosis Functional Composite (MSFC) score, optical coherence tomography and magnetic resonance imaging including 1 H MRS at baseline and after 1 year. RESULTS At baseline, NAA/creatine level was lower in T2 WM lesions than in NAWM (1.64 ± 0.16 vs. 1.88 ± 0.24, P < 0.001). Lowest levels were found in secondary progressive MS (SPMS). Mean RNFLT was higher in clinically isolated syndrome than in the combined group of relapsing-remitting MS and SPMS (99.8 ± 12.3 μm vs. 92.4 ± 12.8 μm, P = 0.038). In all patients, mean RNFLT decreased by 1.4% during follow-up. At baseline, MSFC z-scores correlated with NAA/creatine levels both in NAWM (r = 0.42; P = 0.008) and T2 WM lesions (r = 0.52, P = 0.004). NAWM NAA/creatine variation correlated with the RNFLT change over 1 year (ρ = 0.43, P = 0.046). CONCLUSIONS N-acetyl aspartate/creatine level reduction correlated with RNFLT thinning over 1 year in an EDSS stable MS cohort suggesting that these techniques might be sensitive to detect subclinical disease progression.
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Affiliation(s)
- M Pardini
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genoaand IRCCS S.Martino-IST, Genoa, Italy
| | | | - S Müller
- Department of Neurology, Cantonal Hospital St Gallen, St Gallen, Switzerland
| | - J Vehoff
- Department of Neurology, Cantonal Hospital St Gallen, St Gallen, Switzerland
| | - J Kuhle
- Department of Neurology, University Hospital Basel, Basel, Switzerland.,Departments of Medicine, Biomedicine and Clinical Research, Basel, Switzerland
| | - E Ruberte
- Medical Image Analysis Center, Basel, Switzerland
| | - J Würfel
- Medical Image Analysis Center, Basel, Switzerland
| | - A Gass
- Department of Neurology, University Hospital Mannheim, Mannheim, Germany
| | - C Valmaggia
- Department of Ophthalmology, Cantonal Hospital St Gallen, St Gallen, Switzerland
| | - B Tettenborn
- Department of Neurology, Cantonal Hospital St Gallen, St Gallen, Switzerland
| | | | - Ö Yaldizli
- Department of Neurology, University Hospital Basel, Basel, Switzerland
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Coutinho L, Das I, Würfel J, Cheng C. TU-A-BRB-07: Characteristics of Diode Detectors in Proton Beam Dosimetry. Med Phys 2012. [DOI: 10.1118/1.4735864] [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: 11/07/2022] Open
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Paul F, Dörr J, Würfel J, Vogel HP, Zipp F. Early mitoxantrone-induced cardiotoxicity in secondary progressive multiple sclerosis. BMJ Case Rep 2009; 2009:bcr06.2009.2004. [PMID: 21734913 DOI: 10.1136/bcr.06.2009.2004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Mitoxantrone is an anthracenedione antineoplastic agent approved as an escalating immunotherapy for multiple sclerosis. Owing to structural similarity with other anthracyclines, cardiotoxicity is a severe side effect of mitoxantrone. The risk of mitoxantrone-induced cardiotoxicity in patients with multiple sclerosis increases with cumulative doses >100 mg/m(2) body surface area (BSA). However, the effect of mitoxantrone on cardiac function in the early phase of treatment with cumulative doses <100 mg/m(2) BSA is unclear. The present report concerns four patients with a temporary and considerable decrease in left ventricular ejection fraction (LVEF) and with additional echocardiographic findings of diastolic dysfunction after only one or two doses of mitoxantrone. The risk of cardiotoxicity at low doses of mitoxantrone is highlighted.
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Affiliation(s)
- F Paul
- Institute of Neuroimmunology, Charité-Universitaetsmedizin Berlin, Berlin, Germany
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Bellmann-Strobl J, Aktas O, Würfel J, Schmierer K, Paul F, Zschenderlein R, Villringer A, Zipp F. Primary progressive multiple sclerosis: evidence for uncoupling disease progression and inflammation. Akt Neurol 2006. [DOI: 10.1055/s-2006-953204] [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: 10/20/2022]
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Bellmann-Strobl J, Waiczies S, Würfel J, Aktas O, Zipp F. Hochdosis-Therapie mit Atorvastatin: gute Verträglichkeit bei Multipler Sklerose auch unter Kombination mit Interferontherapie. Akt Neurol 2005. [DOI: 10.1055/s-2005-919391] [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: 10/26/2022]
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Würfel J, Seiter S, Stassar M, Claas A, Kläs R, Rösel M, Marhaba R, Savelyeva L, Schwab M, Matzku S, Zöller M. Cloning of the human homologue of the metastasis-associated rat C4.4A. Gene 2001; 262:35-41. [PMID: 11179665 DOI: 10.1016/s0378-1119(00)00515-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We have previously described a rat metastasis-associated molecule, C4.4A, which has some common features with the uPAR. Because of its restricted expression in non-transformed tissues a search for the human homologue became of interest. Human C4.4A was cloned from a placental cDNA library. As in the rat, the human uPAR and the human C4.4A genes appear to belong to the same family. Both genes are located on chromosome 19q13.1-q13.2 and both molecules have a glycolipid anchor site and are composed of three extracellular domains. Only domains one and two of the human C4.4A and the uPAR protein show a significant degree of identity. Expression of the human C4.4A was observed by RT-PCR and Northern blotting in placental tissue, skin, esophagus and peripheral blood leukocytes, but not in brain, lung, liver, kidney, stomach, colon and lymphoid organs. Yet, tumors derived from the latter tissues frequently contained C4.4A mRNA. As demonstrated for malignant melanoma, C4.4A mRNA expression correlated with tumor progression. While nevi were negative and only a minority of primary malignant melanoma expressed C4.4A, all metastases were C4.4A-positive. Taking into account the high degree of homology between rat and human C4.4A, the conformity of the expression profiles and the association of rat C4.4A with tumor progression, human C4.4A might well become a prognostic marker and possibly a target of therapy.
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Affiliation(s)
- J Würfel
- Department of Tumor Progression and Immune Defense, German Cancer Research Center, Im Neuenheimer Feld 280, D-69120, Heidelberg, Germany
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Würfel J, Rösel M, Seiter S, Claas C, Herlevsen M, Weth R, Zöller M. Metastasis-association of the rat ortholog of the human epithelial glycoprotein antigen EGP314. Oncogene 1999; 18:2323-34. [PMID: 10327052 DOI: 10.1038/sj.onc.1202542] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Screening for surface molecules expressed by metastasizing rat tumors had revealed evidence for metastasis-association of a molecule also expressed on epithelial cells. The similarity to the expression profile of the panepithelial glycoprotein EGP314 prompted us to isolate and sequence the gene and to explore functional features of the molecule in transfected tumor lines. The molecule D5.7A, named according to the antibody, D5.7, used for selection, indeed, is the ortholog of EGP314 with 92% and 80% identity to the murine and the human molecules. Like EGP314, D5.7A has a particular cleavage site, a small cleavage product being resolved under reducing conditions from the membrane anchored part of the molecule. Transfection of a low metastasizing fibrosarcoma, pheochromoblastoma and adenocarcinoma revealed that expression of D5.7A facilitates tumor progression. Depending on the origin of the tumor, D5.7A transfectants either metastasized via the lymphatic system (pheochromoblastoma, adenocarcinoma) or hematogeneously (fibrosarcoma). Particularly after proteolytic cleavage, D5.7A facilitated cell - cell adhesion and provided a proliferative signal upon crosslinking. Thus, the rat ortholog of EGP314 is involved in metastasis formation. Importantly, its functional activities apparently rely on proteolytic cleavage. These findings provide a first evidence on how a panepithelial marker can be involved in tumor progression.
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Affiliation(s)
- J Würfel
- Department of Tumor Progression and Immune Defense, German Cancer Research Center, Heidelberg
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Hertel E, Würfel J. [Surgery of scoliosis and its result]. Z Orthop Ihre Grenzgeb 1969; 106:85-98. [PMID: 4240794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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