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Borm KJ, Behzadi ST, Hörner-Rieber J, Krug D, Baumann R, Corradini S, Duma MN, Dunst J, Fastner G, Feyer P, Fietkau R, Haase W, Harms W, Hehr T, Matuschek C, Piroth MD, Schmeel LC, Souchon R, Strnad V, Budach W, Combs SE. DEGRO guideline for personalized radiotherapy of brain metastases and leptomeningeal carcinomatosis in patients with breast cancer. Strahlenther Onkol 2024; 200:259-275. [PMID: 38488902 DOI: 10.1007/s00066-024-02202-0] [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: 01/03/2024] [Accepted: 01/07/2024] [Indexed: 03/17/2024]
Abstract
PURPOSE The aim of this review was to evaluate the existing evidence for radiotherapy for brain metastases in breast cancer patients and provide recommendations for the use of radiotherapy for brain metastases and leptomeningeal carcinomatosis. MATERIALS AND METHODS For the current review, a PubMed search was conducted including articles from 01/1985 to 05/2023. The search was performed using the following terms: (brain metastases OR leptomeningeal carcinomatosis) AND (breast cancer OR breast) AND (radiotherapy OR ablative radiotherapy OR radiosurgery OR stereotactic OR radiation). CONCLUSION AND RECOMMENDATIONS Despite the fact that the biological subtype of breast cancer influences both the occurrence and relapse patterns of breast cancer brain metastases (BCBM), for most scenarios, no specific recommendations regarding radiotherapy can be made based on the existing evidence. For a limited number of BCBM (1-4), stereotactic radiosurgery (SRS) or fractionated stereotactic radiotherapy (SRT) is generally recommended irrespective of molecular subtype and concurrent/planned systemic therapy. In patients with 5-10 oligo-brain metastases, these techniques can also be conditionally recommended. For multiple, especially symptomatic BCBM, whole-brain radiotherapy (WBRT), if possible with hippocampal sparing, is recommended. In cases of multiple asymptomatic BCBM (≥ 5), if SRS/SRT is not feasible or in disseminated brain metastases (> 10), postponing WBRT with early reassessment and reevaluation of local treatment options (8-12 weeks) may be discussed if a HER2/Neu-targeting systemic therapy with significant response rates in the central nervous system (CNS) is being used. In symptomatic leptomeningeal carcinomatosis, local radiotherapy (WBRT or local spinal irradiation) should be performed in addition to systemic therapy. In patients with disseminated leptomeningeal carcinomatosis in good clinical condition and with only limited or stable extra-CNS disease, craniospinal irradiation (CSI) may be considered. Data regarding the toxicity of combining systemic therapies with cranial and spinal radiotherapy are sparse. Therefore, no clear recommendations can be given, and each case should be discussed individually in an interdisciplinary setting.
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Affiliation(s)
- Kai J Borm
- TUM School of Medicine, Department of Radiation Oncology, Technical University of Munich, Ismaninger Straße 22, 81675, Munich, Germany
| | - Sophie T Behzadi
- TUM School of Medicine, Department of Radiation Oncology, Technical University of Munich, Ismaninger Straße 22, 81675, Munich, Germany
| | - Juliane Hörner-Rieber
- Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany
| | - David Krug
- Department of Radiation Oncology, University Hospital Schleswig-Holstein, Kiel, Germany
| | - Rene Baumann
- Department of Radiation Oncology, St. Marien-Krankenhaus, Siegen, Germany
| | - Stefanie Corradini
- Department of Radiation Oncology, University Hospital, LMU Munich, Munich, Germany
| | - Marciana Nona Duma
- Department of Radiation Oncology, Helios Clinics of Schwerin-University Campus of MSH Medical School Hamburg, Schwerin, Germany
- Department for Human Medicine, MSH Medical School Hamburg, Hamburg, Germany
| | - Jürgen Dunst
- Department of Radiation Oncology, University Hospital Schleswig-Holstein, Kiel, Germany
| | - Gerd Fastner
- Department of Radiotherapy and Radio-Oncology, University Hospital Salzburg, Landeskrankenhaus, Paracelsus Medical University, Salzburg, Austria
| | - Petra Feyer
- Formerly Department of Radiation Oncology, Vivantes Hospital Neukölln, Berlin, Germany
| | - Rainer Fietkau
- Department of Radiation Oncology, University Hospital Erlangen, Erlangen, Germany
| | - Wulf Haase
- Formerly Department of Radiation Oncology, St.-Vincentius-Hospital Karlsruhe, Karlsruhe, Germany
| | - Wolfgang Harms
- Department of Radiation Oncology, St. Claraspital, Basel, Switzerland
| | - Thomas Hehr
- Department of Radiation Oncology, Marienhospital Stuttgart, Stuttgart, Germany
| | - Christiane Matuschek
- Department of Radiation Oncology, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Marc D Piroth
- Department of Radiation Oncology, HELIOS University Hospital Wuppertal, Witten/Herdecke University, Wuppertal, Germany
| | | | - Rainer Souchon
- Formerly Department of Radiation Oncology, University Hospital Tübingen, Tübingen, Germany
| | - Vratislav Strnad
- Department of Radiation Oncology, University Hospital Erlangen, Erlangen, Germany
| | - Wilfried Budach
- Department of Radiation Oncology, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Stephanie E Combs
- TUM School of Medicine, Department of Radiation Oncology, Technical University of Munich, Ismaninger Straße 22, 81675, Munich, Germany.
- Partner Site Munich, Deutsches Konsortium für Translationale Krebsforschung (DKTK), Munich, Germany.
- Department of Radiation Medicine (IRM), Helmholtz Zentrum München (HMGU), Neuherberg, Germany.
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Piroth MD, Strnad V, Krug D, Fastner G, Baumann R, Combs SE, Duma MN, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Hehr T, Sedlmayer F, Souchon R, Budach W. Long-Term Results of the TARGIT-A Trial: More Questions than Answers. Breast Care (Basel) 2022; 17:81-84. [PMID: 35355706 PMCID: PMC8914270 DOI: 10.1159/000515386] [Citation(s) in RCA: 2] [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: 02/04/2021] [Accepted: 02/20/2021] [Indexed: 02/03/2023] Open
Abstract
Background During the last decade, partial breast irradiation (PBI) has gained traction as a relevant treatment option for patients with early-stage low-risk breast cancer after breast-conserving surgery. The TARGIT-A prospective randomized trial compared a "risk-adapted" intraoperative radiotherapy (IORT) approach with 50-kv X-rays (INTRABEAM®) as the PBI followed by optional whole-breast irradiation (WBI) and conventional adjuvant WBI in terms of observed 5-year in-breast recurrence rates. Recently, long-term data were published. Since the first publication of the TARGIT-A trial, a broad debate has been emerged regarding several uncertainties and limitations associated with data analysis and interpretation. Our main objective was to summarize the data, with an emphasis on the updated report and the resulting implications. Summary From our point of view, the previously unresolved questions still remain and more have been added, especially with regard to the study design, a change in the primary outcome measure, the significant number of patients lost to follow-up, and the lack of a subgroup analysis according to risk factors and treatment specifications. Key Message Taking into account the abovementioned limitations of the recently published long-term results of the TARGIT-A trial, the German Society of Radiation Oncology (DEGRO) Breast Cancer Expert Panel adheres to its recently published recommendations on PBI: "the 50-kV system (INTRABEAM) cannot be recommended for routine adjuvant PBI treatment after breast-conserving surgery."
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Affiliation(s)
- Marc D. Piroth
- Department of Radiation Oncology, Helios University Hospital Wuppertal, Witten/Herdecke University, Wuppertal, Germany
| | - Vratislav Strnad
- Department of Radiation Oncology, University Hospital, Erlangen, Germany
| | - David Krug
- Department of Radiation Oncology, University Hospital Schleswig-Holstein, Kiel, Germany
| | - Gerd Fastner
- Department of Radiation Oncology, Paracelsus Medical University Hospital, Salzburg, Austria
| | - René Baumann
- Department of Radiation Oncology, St. Marien-Krankenhaus, Siegen, Germany
| | - Stephanie E. Combs
- Department of Radiation Oncology, Technical University of Munich (TUM), München, Germany
| | - Marciana Nona Duma
- Department of Radiation Oncology, Friedrich-Schiller-University Hospital, Jena, Germany
| | - Jürgen Dunst
- Department of Radiation Oncology, University Hospital Schleswig-Holstein, Kiel, Germany
| | - Petra Feyer
- Department of Radiation Oncology, Vivantes Hospital Neukoelln, Berlin, Germany
| | - Rainer Fietkau
- Department of Radiation Oncology, University Hospital, Erlangen, Germany
| | - Wulf Haase
- Formerly St.-Vincentius-Hospital Karlsruhe, Karlsruhe, Germany
| | - Wolfgang Harms
- Department of Radiation Oncology, St. Claraspital, Basel, Switzerland
| | - Thomas Hehr
- Department of Radiation Oncology, Marienhospital, Stuttgart, Germany
| | - Felix Sedlmayer
- Department of Radiation Oncology, Paracelsus Medical University Hospital, Salzburg, Austria
| | | | - Wilfried Budach
- Department of Radiation Oncology, Heinrich-Heine-University Hospital, Düsseldorf, Germany
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González-Henríquez C, Vergara-Toloza R, Romero-Hasler P, Soto-Bustamante E, Haase W. Effect of the methacrylic group on the degradation of polar achiral composites after successive poling cycles and appearance of antiferroelectric behaviour. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116621] [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: 11/26/2022]
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Piroth MD, Krug D, Sedlmayer F, Duma MN, Baumann R, Budach W, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Hehr T, Souchon R, Strnad V, Sauer R. Post-neoadjuvant treatment with capecitabine and trastuzumab emtansine in breast cancer patients-sequentially, or better simultaneously? Strahlenther Onkol 2021; 197:1-7. [PMID: 32737515 PMCID: PMC7801351 DOI: 10.1007/s00066-020-01667-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 07/01/2020] [Indexed: 10/27/2022]
Abstract
PURPOSE Following neoadjuvant chemotherapy for breast cancer, postoperative systemic therapy, also called post-neoadjuvant treatment, has been established in defined risk settings. We reviewed the evidence for sequencing of postoperative radiation and chemotherapy, with a focus on a capecitabine and trastuzumab emtansine (T-DM1)-based regimen. METHODS A systematic literature search using the PubMed/MEDLINE/Web of Science database was performed. We included prospective and retrospective reports published since 2015 and provided clinical data on toxicity and effectiveness. RESULTS Six studies were included, five of which investigated capecitabine-containing regimens. Of these, four were prospective investigations and one a retrospective matched comparative analysis. One randomized prospective trial was found for T‑DM1 and radiotherapy. In the majority of these reports, radiation-associated toxicities were not specifically addressed. CONCLUSION Regarding oncologic outcome, the influence of sequencing radiation therapy with maintenance capecitabine chemotherapy in the post-neoadjuvant setting is unclear. Synchronous administration of capecitabine is feasible, but reports on possible excess toxicities are partially conflicting. Dose reduction of capecitabine should be considered, especially if normofractionated radiotherapy is used. In terms of tolerance, hypofractionated schedules seem to be superior in terms of toxicity in concurrent settings. T‑DM1 can safely be administered concurrently with radiotherapy.
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Affiliation(s)
- Marc D. Piroth
- Dpt. of Radiation Oncology, Wuppertal University Hospital (Helios), Witten/Herdecke University, Heusnerstraße 40, 42283 Wuppertal, Germany
| | - David Krug
- University Hospital Schleswig-Holstein, Kiel, Germany
| | - Felix Sedlmayer
- Paracelsus Medical University Hospital Salzburg, Salzburg, Austria
| | | | | | - Wilfried Budach
- Heinrich-Heine-University Hospital Düsseldorf, Düsseldorf, Germany
| | - Jürgen Dunst
- University Hospital Schleswig-Holstein, Kiel, Germany
| | - Petra Feyer
- Vivantes Hospital Neukoelln, Berlin, Germany
| | | | - Wulf Haase
- formerly St.-Vincentius-Hospital Karlsruhe, Karlsruhe, Germany
| | | | - Thomas Hehr
- Marienhospital Stuttgart, Stuttgart, Germany
| | | | | | - Rolf Sauer
- University Hospital Erlangen, Erlangen, Germany
| | - Breast Cancer Expert Panel of the German Society of Radiation Oncology (DEGRO)
- Dpt. of Radiation Oncology, Wuppertal University Hospital (Helios), Witten/Herdecke University, Heusnerstraße 40, 42283 Wuppertal, Germany
- University Hospital Schleswig-Holstein, Kiel, Germany
- Paracelsus Medical University Hospital Salzburg, Salzburg, Austria
- Friedrich-Schiller-University Hospital Jena, Jena, Germany
- St. Marien-Krankenhaus Siegen, Siegen, Germany
- Heinrich-Heine-University Hospital Düsseldorf, Düsseldorf, Germany
- Vivantes Hospital Neukoelln, Berlin, Germany
- University Hospital Erlangen, Erlangen, Germany
- formerly St.-Vincentius-Hospital Karlsruhe, Karlsruhe, Germany
- St. Claraspital Basel, Basel, Switzerland
- Marienhospital Stuttgart, Stuttgart, Germany
- formerly University Hospital, Tübingen, Germany
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Strnad V, Krug D, Sedlmayer F, Piroth MD, Budach W, Baumann R, Feyer P, Duma MN, Haase W, Harms W, Hehr T, Fietkau R, Dunst J, Sauer R. DEGRO practical guideline for partial-breast irradiation. Strahlenther Onkol 2020; 196:749-763. [PMID: 32350554 PMCID: PMC7449998 DOI: 10.1007/s00066-020-01613-z] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 03/19/2020] [Indexed: 12/24/2022]
Abstract
Purpose This consensus statement from the Breast Cancer Working Group of the German Society for Radiation Oncology (DEGRO) aims to define practical guidelines for accelerated partial-breast irradiation (APBI). Methods Recent recommendations for relevant aspects of APBI were summarized and a panel of experts reviewed all the relevant literature. Panel members of the DEGRO experts participated in a series of conferences, supplemented their clinical experience, performed a literature review, and formulated recommendations for implementing APBI in clinical routine, focusing on patient selection, target definition, and treatment technique. Results Appropriate patient selection, target definition for different APBI techniques, and basic rules for appropriate APBI techniques for clinical routine outside of clinical trials are described. Detailed recommendations for APBI in daily practice, including dose constraints, are given. Conclusion Guidelines are mandatory to assure optimal results of APBI using different techniques.
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Affiliation(s)
- V Strnad
- University Hospital Erlangen, Erlangen, Germany.
| | - D Krug
- University Hospital Schleswig-Holstein, Kiel, Germany
| | - F Sedlmayer
- Paracelsus Medical University Hospital Salzburg, Salzburg, Austria
| | - M D Piroth
- Helios University Hospital Wuppertal, Witten/Herdecke University, Wuppertal, Germany
| | - W Budach
- Heinrich-Heine-University Hospital Düsseldorf, Düsseldorf, Germany
| | - R Baumann
- St. Marien-Krankenhaus Siegen, Siegen, Germany
| | - P Feyer
- Vivantes Hospital Neukoelln, Berlin, Germany
| | - M N Duma
- University Hospital, Jena, Germany
| | - W Haase
- St.-Vincentius-Hospital Karlsruhe, Karlsruhe, Germany
| | - W Harms
- St. Claraspital Basel, Basel, Switzerland
| | - T Hehr
- Marienhospital Stuttgart, Stuttgart, Germany
| | - R Fietkau
- University Hospital Erlangen, Erlangen, Germany
| | - J Dunst
- University Hospital Schleswig-Holstein, Kiel, Germany
| | - R Sauer
- University Hospital Erlangen, Erlangen, Germany
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Hajak G, Clarenbach P, Fischer W, Haase W, Bandelow B, Adler L, Rüther E. Effects of hypnotics on sleep quality and daytime well-being. Data from a comparative multicentre study in outpatients with insomnia. Eur Psychiatry 2020; 10 Suppl 3:173s-9s. [DOI: 10.1016/0924-9338(96)80100-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
SummaryThe effect of treatment (28 days) with zopiclone, triazolam, flunitrazepam and placebo on sleep quality and daytime well-being was proven in a randomised, double-blind, parallel group, multicentre study in private practice. Results of an exploratory statistic of treatment efficacy in a subgroup of 1,291 patients suffering from insomnia are presented. Patients met the following criteria: insomnia lasting at least four weeks and the presence of at least two of the following: 1) sleep latency ≥ 45 minutes, 2) total sleep time ≤ 6 hours, and 3) nocturnal awakening ≥3 times. Treatment efficacy was assessed according to the following factors: either a shortening of sleep latency by at least 15 minutes, or prolongation of total sleep time by at least 20%, or reduction of the number of nocturnal awakenings to three or less and a refreshed feeling in the morning as well as no impairment in daytime well-being due to tiredness or anxiety. The total response rate was markedly higher with zopiclone (42.3%; p = 0.0003) than with placebo (29.0%). Triazolam (36.6%; p = 0.0905) and flunitrazepam (33.1%; p = 0.3401) were also more effective than the placebo, but they both tended to have a lower response rate than with zopiclone (p = 0.1199 and 0.0151, respectively). Total response was found to be essentially a reflection of the response of the socially important parameter of daytime well-being. These results suggest that zopiclone is more effective in the treatment of insomnia than either triazolam or flunitrazepam. Since the response of daytime well-being to therapy was generally poor, this parameter embodies the next main therapeutic challenge in the treatment of patients with insomnia.
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Krug D, Baumann R, Budach W, Duma MN, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Hehr T, Piroth MD, Sedlmayer F, Souchon R, Wenz F, Sauer R. Commercially Available Gene Expression Assays as Predictive Tools for Adjuvant Radiotherapy? A Critical Review. Breast Care (Basel) 2020; 15:118-126. [PMID: 32398980 DOI: 10.1159/000505656] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 06/30/2019] [Accepted: 12/23/2019] [Indexed: 12/17/2022] Open
Abstract
Background Gene expression assays are increasingly used for decision-making regarding adjuvant chemotherapy in patients with hormone receptor-positive, HER2-negative breast cancer. There are some clinical situations in which there is also a need for better prognostic and predictive markers to better estimate the amount of benefit from adjuvant radiotherapy. The rising availability of gene expression analyses prompts the question whether their results can also be used to guide clinical decisions regarding adjuvant radiation. Summary Multiple studies suggest a correlation between results from gene expression assays and locoregional recurrence rates. Only few publications addressed the predictive value of results from gene expression analysis for the role of adjuvant radiotherapy in different settings. Key Messages To date, the available evidence on the possible predictive value of gene expression assays for radiotherapy does not support their inclusion into the decision-making process for adjuvant radiation. This is due to methodological weaknesses and limitations regarding patient selection, the nonrandomized design of all studies in terms of radiotherapy use, and limited availability of tissue from prospective trials. Thus, utilization of the present knowledge for clinical indication of radiotherapy should be very cautious.
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Affiliation(s)
- David Krug
- Department of Radiation Oncology, University Hospital Schleswig-Holstein, Kiel, Germany
| | - René Baumann
- Department of Radiation Oncology, University Hospital Schleswig-Holstein, Kiel, Germany.,Department of Radiation Oncology, St. Marien-Krankenhaus, Siegen, Germany
| | - Wilfried Budach
- Department of Radiation Oncology, University Hospital Düsseldorf, Düsseldorf, Germany
| | - Marciana Nona Duma
- Department of Radiation Oncology, University Hospital Jena, Jena, Germany
| | - Jürgen Dunst
- Department of Radiation Oncology, University Hospital Schleswig-Holstein, Kiel, Germany
| | | | | | - Wulf Haase
- St.-Vincentius-Hospital, Karlsruhe, Germany
| | | | - Thomas Hehr
- Department of Radiation Oncology, Marienhospital Stuttgart, Stuttgart, Germany
| | - Marc D Piroth
- HELIOS University Hospital Wuppertal, Witten/Herdecke University, Wuppertal, Germany
| | | | | | | | - Rolf Sauer
- University Hospital Erlangen, Erlangen, Germany
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Duma MN, Baumann R, Budach W, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Hehr T, Krug D, Piroth MD, Sedlmayer F, Souchon R, Sauer R. Heart-sparing radiotherapy techniques in breast cancer patients: a recommendation of the breast cancer expert panel of the German society of radiation oncology (DEGRO). Strahlenther Onkol 2019; 195:861-871. [PMID: 31321461 DOI: 10.1007/s00066-019-01495-w] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [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: 06/20/2019] [Accepted: 06/27/2019] [Indexed: 02/08/2023]
Abstract
PURPOSE The aim of this review was to analyze the respective efficacy of various heart-sparing radiotherapy techniques. MATERIAL AND METHODS Heart-sparing can be performed in three different ways in breast cancer radiotherapy: by seeking to keep the heart out of treated volumes (i.e. by prone position or specific breathing techniques such as deep inspiration breath-hold [DIBH] and/or gating), by solely irradiating a small volume around the lumpectomy cavity (partial breast irradiation, PBI), or by using modern radiation techniques like intensity-modulated radiation therapy (IMRT), volumetric modulated arc therapy (VMAT) or protons. This overview presents the available data on these three approaches. RESULTS Studies on prone position are heterogeneous and most trials only refer to patients with large breasts; therefore, no definitive conclusion can be drawn for clinical routine. Nonetheless, there seems to be a trend toward better sparing of the left anterior descending artery in supine position even for these selected patients. The data on the use of DIBH for heart-sparing in breast cancer patients is consistent and the benefit compared to free-breathing is supported by several studies. In comparison with whole breast irradiation (WBI), PBI has an advantage in reducing the heart dose. Of note, DIBH and PBI with multicatheter brachytherapy are similar with regard to the dose reduction to heart structures. WBI by IMRT/VMAT techniques without DIBH is not an effective strategy for heart-sparing in breast cancer patients with "standard" anatomy. A combination of DIBH and IMRT may be used for internal mammary radiotherapy. CONCLUSION Based on the available findings, the DEGRO breast cancer expert panel recommends the use of DIBH as the best heart-sparing technique. Nonetheless, depending on the treatment volume and localization, other techniques may be employed or combined with DIBH when appropriate.
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Affiliation(s)
- Marciana-Nona Duma
- Department of Radiotherapy and Radiation Oncology, University Hospital, Friedrich-Schiller-University, Bachstr. 18, 07745, Jena, Germany.
| | | | - Wilfried Budach
- Heinrich-Heine-University Hospital Düsseldorf, Düsseldorf, Germany
| | - Jürgen Dunst
- University Hospital Schleswig-Holstein, Kiel, Germany
| | - Petra Feyer
- Vivantes Hospital Neukoelln, Berlin, Germany
| | | | - Wulf Haase
- St.-Vincentius-Hospital Karlsruhe, Karlsruhe, Germany
| | | | - Thomas Hehr
- Marienhospital Stuttgart, Stuttgart, Germany
| | - David Krug
- University Hospital Schleswig-Holstein, Kiel, Germany
| | - Marc D Piroth
- Helios University Hospital Wuppertal, Witten/Herdecke University, Wuppertal, Germany
| | - Felix Sedlmayer
- Paracelsus Medical University Hospital Salzburg, Salzburg, Austria
| | | | - Rolf Sauer
- University Hospital Erlangen, Erlangen, Germany
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Piroth MD, Baumann R, Budach W, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Hehr T, Krug D, Röser A, Sedlmayer F, Souchon R, Wenz F, Sauer R. Heart toxicity from breast cancer radiotherapy : Current findings, assessment, and prevention. Strahlenther Onkol 2018; 195:1-12. [PMID: 30310926 PMCID: PMC6329735 DOI: 10.1007/s00066-018-1378-z] [Citation(s) in RCA: 121] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2018] [Accepted: 09/20/2018] [Indexed: 12/13/2022]
Abstract
Background Late cardiac toxicities caused by (particularly left-sided) breast radiotherapy (RT) are now recognized as rare but relevant sequelae, which has prompted research on risk structure identification and definition of threshold doses to heart subvolumes. The aim of the present review was to critically discuss the clinical evidence on late cardiac reactions based on dose-dependent outcome reports for mean heart doses as well as doses to cardiac substructures. Methods A literature review was performed to examine clinical evidence on radiation-induced heart toxicities. Mean heart doses and doses to cardiac substructures were focused upon based on dose-dependent outcome reports. Furthermore, an overview of radiation techniques for heart protection is given and non-radiotherapeutic aspects of cardiotoxicity in the multimodal setting of breast cancer treatment are discussed. Results Based on available findings, the DEGRO breast cancer expert panel recommends the following constraints: mean heart dose <2.5 Gy; DmeanLV (mean dose left ventricle) < 3 Gy; V5LV (volume of LV receiving ≥5 Gy) < 17%; V23LV (volume of LV receiving ≥23 Gy) < 5%; DmeanLAD (mean dose left descending artery) < 10 Gy; V30LAD (volume of LAD receiving ≥30 Gy) < 2%; V40LAD (volume of LAD receiving ≥40 Gy) < 1%. Conclusion In addition to mean heart dose, breast cancer RT treatment planning should also include constraints for cardiac subvolumes such as LV and LAD. The given constraints serve as a clinicians’ aid for ensuring adequate heart protection. The individual decision between sufficient protection of cardiac structures versus optimal target volume coverage remains in the physician’s hand. The risk of breast cancer-specific mortality and a patient’s cardiac risk factors must be individually weighed up against the risk of radiation-induced cardiotoxicity.
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Affiliation(s)
- Marc D. Piroth
- Helios University Hospital Wuppertal, Witten/Herdecke University, Heusnerstraße 40, 42283 Wuppertal, Germany
| | - René Baumann
- St. Marien-Krankenhaus Siegen, Siegen, Germany
- University Hospital Schleswig-Holstein, Kiel, Germany
| | - Wilfried Budach
- Heinrich-Heine-University Hospital Düsseldorf, Düsseldorf, Germany
| | - Jürgen Dunst
- University Hospital Schleswig-Holstein, Kiel, Germany
| | - Petra Feyer
- Vivantes Hospital Neukoelln, Berlin, Germany
| | | | - Wulf Haase
- formerly St.-Vincentius-Hospital Karlsruhe, Karlsruhe, Germany
| | | | - Thomas Hehr
- Marienhospital Stuttgart, Stuttgart, Germany
| | - David Krug
- University Hospital Heidelberg, Heidelberg, Germany
- Heidelberg Institute for Radiation Oncology (HIRO), National Center for Radiation Research in Oncology (NCRO), Heidelberg, Germany
| | - Arnd Röser
- Helios University Hospital Wuppertal, Witten/Herdecke University, Heusnerstraße 40, 42283 Wuppertal, Germany
| | - Felix Sedlmayer
- Paracelsus Medical University Hospital Salzburg, Salzburg, Austria
| | | | - Frederik Wenz
- University Hospital Mannheim, Medical Faculty, Heidelberg University, Mannheim, Germany
| | - Rolf Sauer
- University Hospital Erlangen, Erlangen, Germany
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Krug D, Baumann R, Budach W, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Hehr T, Piroth MD, Sedlmayer F, Souchon R, Wenz F, Sauer R. Individualization of post-mastectomy radiotherapy and regional nodal irradiation based on treatment response after neoadjuvant chemotherapy for breast cancer. Strahlenther Onkol 2018; 194:607-618. [DOI: 10.1007/s00066-018-1270-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2018] [Accepted: 01/16/2018] [Indexed: 01/08/2023]
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11
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Krug D, Baumann R, Budach W, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Piroth MD, Sautter-Bihl ML, Sedlmayer F, Souchon R, Wenz F, Sauer R. Current controversies in radiotherapy for breast cancer. Radiat Oncol 2017; 12:25. [PMID: 28114948 PMCID: PMC5259946 DOI: 10.1186/s13014-017-0766-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Accepted: 01/11/2017] [Indexed: 01/22/2023] Open
Abstract
Multimodal treatment approaches have substantially improved the outcome of breast cancer patients in the last decades. Radiotherapy is an integral component of multimodal treatment concepts used in curative and palliative intention in numerous clinical situations from precursor lesions such as ductal carcinoma in situ (DCIS) to advanced breast cancer. This review addresses current controversial topics in radiotherapy with special consideration of DCIS, accelerated partial breast irradiation (APBI) and regional nodal irradiation (RNI) and provides an update on the clinical practice guidelines of the Breast Cancer Expert Panel of the German Society of Radiation Oncology (DEGRO).
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Affiliation(s)
- David Krug
- Department of Radiation Oncology, University Hospital Heidelberg and National Center for Radiation Research in Oncology (NCRO), Heidelberg, Germany.
| | - René Baumann
- University Hospital Schleswig-Holstein, Kiel, Germany
| | | | - Jürgen Dunst
- University Hospital Schleswig-Holstein, Kiel, Germany
| | - Petra Feyer
- Vivantes Hospital Neukoelln, Berlin, Germany
| | | | - Wulf Haase
- Formerly St.-Vincentius-Hospital, Karlsruhe, Germany
| | | | - Marc D Piroth
- HELIOS-Hospital Wuppertal, Witten/Herdecke University, Wuppertal, Germany
| | | | | | - Rainer Souchon
- Formerly University Hospital Tuebingen, Tuebingen, Germany
| | | | - Rolf Sauer
- University Hospital Erlangen, Erlangen, Germany
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12
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Harms W, Budach W, Dunst J, Feyer P, Fietkau R, Haase W, Krug D, Piroth MD, Sautter-Bihl ML, Sedlmayer F, Souchon R, Wenz F, Sauer R. DEGRO practical guidelines for radiotherapy of breast cancer VI: therapy of locoregional breast cancer recurrences. Strahlenther Onkol 2016; 192:199-208. [PMID: 26931319 PMCID: PMC4833793 DOI: 10.1007/s00066-015-0939-7] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2015] [Accepted: 12/22/2015] [Indexed: 02/07/2023]
Abstract
Objective To update the practical guidelines for radiotherapy of patients with locoregional breast cancer recurrences based on the current German interdisciplinary S3 guidelines 2012. Methods A comprehensive survey of the literature using the search phrases “locoregional breast cancer recurrence”, “chest wall recurrence”, “local recurrence”, “regional recurrence”, and “breast cancer” was performed, using the limits “clinical trials”, “randomized trials”, “meta-analysis”, “systematic review”, and “guidelines”. Conclusions Patients with isolated in-breast or regional breast cancer recurrences should be treated with curative intent. Mastectomy is the standard of care for patients with ipsilateral breast tumor recurrence. In a subset of patients, a second breast conservation followed by partial breast irradiation (PBI) is an appropriate alternative to mastectomy. If a second breast conservation is performed, additional irradiation should be mandatory. The largest reirradiation experience base exists for multicatheter brachytherapy; however, prospective clinical trials are needed to clearly define selection criteria, long-term local control, and toxicity. Following primary mastectomy, patients with resectable locoregional breast cancer recurrences should receive multimodality therapy including systemic therapy, surgery, and radiation +/− hyperthermia. This approach results in high local control rates and long-term survival is achieved in a subset of patients. In radiation-naive patients with unresectable locoregional recurrences, radiation therapy is mandatory. In previously irradiated patients with a high risk of a second local recurrence after surgical resection or in patients with unresectable recurrences, reirradiation should be strongly considered. Indication and dose concepts depend on the time interval to first radiotherapy, presence of late radiation effects, and concurrent or sequential systemic treatment. Combination with hyperthermia can further improve tumor control. In patients with isolated axillary or supraclavicular recurrence, durable disease control is best achieved with multimodality therapy including surgery and radiotherapy. Radiation therapy significantly improves local control and should be applied whenever feasible.
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Affiliation(s)
- Wolfgang Harms
- Abteilung für Radioonkologie, St. Claraspital, Kleinriehenstrasse 30, 4016, Basel, Switzerland.
| | - W Budach
- Heinrich-Heine-University, Duesseldorf, Germany
| | - J Dunst
- University Hospital Schleswig-Holstein, Kiel, Germany
| | - P Feyer
- Vivantes Hospital Neukoelln, Berlin, Germany
| | - R Fietkau
- University Hospital Erlangen, Erlangen, Germany
| | - W Haase
- Formerly St.-Vincentius-Hospital, Karlsruhe, Germany
| | - D Krug
- University Hospital Heidelberg, Heidelberg, Germany
| | - M D Piroth
- HELIOS-Hospital Wuppertal, Witten/Herdecke University, Wuppertal, Germany
| | | | - F Sedlmayer
- Paracelsus Medical University Hospital, Salzburg, Austria
| | - R Souchon
- Formerly University Hospital Tuebingen, Tuebingen, Germany
| | - F Wenz
- University Medical Center Mannheim, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - R Sauer
- University Hospital Erlangen, Erlangen, Germany
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13
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Haase W, Loub J, Paulus H. The crystal structures of two solid phases of 4-cyano-4′-ethyl-biphenyl. Z KRIST-CRYST MATER 2015. [DOI: 10.1524/zkri.1992.202.14.7] [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: 11/24/2022]
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14
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Budach W, Matuschek C, Bölke E, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Piroth MD, Sautter-Bihl ML, Sedlmayer F, Souchon R, Wenz F, Wenz F, Sauer R. DEGRO practical guidelines for radiotherapy of breast cancer V: Therapy for locally advanced and inflammatory breast cancer, as well as local therapy in cases with synchronous distant metastases. Strahlenther Onkol 2015; 191:623-33. [PMID: 25963557 PMCID: PMC4516860 DOI: 10.1007/s00066-015-0843-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 04/09/2015] [Indexed: 12/14/2022]
Abstract
AIM The purpose of this work is to give practical guidelines for radiotherapy of locally advanced, inflammatory and metastatic breast cancer at first presentation. METHODS A comprehensive survey of the literature using the search phrases "locally advanced breast cancer", "inflammatory breast cancer", "breast cancer and synchronous metastases", "de novo stage IV and breast cancer", and "metastatic breast cancer" and "at first presentation" restricted to "clinical trials", "randomized trials", "meta-analysis", "systematic review", and "guideline" was performed and supplemented by using references of the respective publications. Based on the German interdisciplinary S3 guidelines, updated in 2012, this publication addresses indications, sequence to other therapies, target volumes, dose, and fractionation of radiotherapy. RESULTS International and national guidelines are in agreement that locally advanced, at least if regarded primarily unresectable and inflammatory breast cancer should receive neoadjuvant systemic therapy first, followed by surgery and radiotherapy. If surgery is not amenable after systemic therapy, radiotherapy is the treatment of choice followed by surgery, if possible. Surgery and radiotherapy should be administered independent of response to neoadjuvant systemic treatment. In patients with a de novo diagnosis of breast cancer with synchronous distant metastases, surgery and radiotherapy result in considerably better locoregional tumor control. An improvement in survival has not been consistently proven, but may exist in subgroups of patients. CONCLUSION Radiotherapy is an important part in the treatment of locally advanced and inflammatory breast cancer that should be given to all patients regardless to the intensity and effect of neoadjuvant systemic treatment and the extent of surgery. Locoregional radiotherapy in patients with primarily distant metastatic disease should be prescribed on an individual basis.
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Affiliation(s)
- Wilfried Budach
- Klinik für Strahlentherapie und Radioonkologie, University Hospital, Heinrich-Heine-University Düsseldorf, Moorenstraße 5, 40225, Düsseldorf, Germany,
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15
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Shukla RK, Mirzaei J, Sharma A, Hofmann D, Hegmann T, Haase W. Electro-optic and dielectric properties of a ferroelectric liquid crystal doped with chemically and thermally stable emissive carbon dots. RSC Adv 2015. [DOI: 10.1039/c5ra01257k] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Dispersion of the C-dots in n-hexane under ambient light and under 366 nm illumination indicating the bright photoluminescence of the C-dots; PL spectra of C-dots at different excitation wavelengths (360 nm to 540 nm) increasing at 20 nm intervals.
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Affiliation(s)
- R. K. Shukla
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie
- Technische Universität Darmstadt
- D-64287 Darmstadt
- Germany
| | - J. Mirzaei
- Department of Chemistry
- University of Manitoba
- Winnipeg
- Canada
| | - A. Sharma
- Chemcial Physics Interdisciplinary Program
- Liquid Crystal Institute
- Kent State University
- Kent
- USA
| | - D. Hofmann
- Chemcial Physics Interdisciplinary Program
- Liquid Crystal Institute
- Kent State University
- Kent
- USA
| | - T. Hegmann
- Department of Chemistry
- University of Manitoba
- Winnipeg
- Canada
- Chemcial Physics Interdisciplinary Program
| | - W. Haase
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie
- Technische Universität Darmstadt
- D-64287 Darmstadt
- Germany
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16
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Sautter-Bihl ML, Sedlmayer F, Budach W, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Piroth MD, Souchon R, Wenz F, Sauer R. How nescience may obscure evidence. Strahlenther Onkol 2014; 190:861-3. [PMID: 25238991 DOI: 10.1007/s00066-014-0755-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- M-L Sautter-Bihl
- Klinik für Radioonkologie und Strahlentherapie, Städtisches Klinikum Karlsruhe gGmbH, 76133, Karlsruhe, Moltkestr. 90, Germany,
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17
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Wenz F, Sperk E, Budach W, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Piroth MD, Sautter-Bihl ML, Sedlmayer F, Souchon R, Fussl C, Sauer R. DEGRO practical guidelines for radiotherapy of breast cancer IV: radiotherapy following mastectomy for invasive breast cancer. Strahlenther Onkol 2014; 190:705-14. [PMID: 24888511 DOI: 10.1007/s00066-014-0687-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [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: 12/24/2022]
Abstract
BACKGROUND AND PURPOSE Since the last recommendations from the Breast Cancer Expert Panel of the German Society for Radiation Oncology (DEGRO) in 2008, evidence for the effectiveness of postmastectomy radiotherapy (PMRT) has grown. This growth is based on updates of the national S3 and international guidelines, as well as on new data and meta-analyses. New aspects were considered when updating the DEGRO recommendations. METHODS The authors performed a comprehensive survey of the literature. Data from recently published (meta-)analyses, randomized clinical trials and international cancer societies' guidelines yielding new aspects compared to 2008 were reviewed and discussed. New aspects were included in the current guidelines. Specific issues relating to particular PMRT constellations, such as the presence of risk factors (lymphovascular invasion, blood vessel invasion, positive lymph node ratio >20 %, resection margins <3 mm, G3 grading, young age/premenopausal status, extracapsular invasion, negative hormone receptor status, invasive lobular cancer, size >2 cm or a combination of ≥ 2 risk factors) and 1-3 positive lymph nodes are emphasized. RESULTS The evidence for improved overall survival and local control following PMRT for T4 tumors, positive resection margins, >3 positive lymph nodes and in T3 N0 patients with risk factors such as lymphovascular invasion, G3 grading, close margins, and young age has increased. Recently identified risk factors such as invasive lobular subtype and negative hormone receptor status were included. For patients with 1-3 positive lymph nodes, the recommendation for PMRT has reached the 1a level of evidence. CONCLUSION PMRT is mandatory in patients with T4 tumors and/or positive lymph nodes and/or positive resection margins. PMRT should be strongly considered in patients with T3 N0 tumors and risk factors, particularly when two or more risk factors are present.
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Affiliation(s)
- Frederik Wenz
- Klinik für Strahlentherapie und Radioonkologie, Universitätsmedizin Mannheim, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany,
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18
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Sai DV, Kumar TA, Haase W, Roy A, Dhara S. Effect of smectic short-range order on the discontinuous anchoring transition in nematic liquid crystals. J Chem Phys 2014; 141:044706. [DOI: 10.1063/1.4890532] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [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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Abstract
Abstract
The diamagnetic susceptibilities, refractive indices and densities were measured as a function of temperature for three 4,4'-disubstituted benzoic acid-phenylester compounds. The polarizabilities were calculated using the Vuks formula and Neugebauer's relations. The orientational order parameters obtained from the magnetic and from the optical data as a function of temperature, in the absence of single crystal data, were compared.
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Affiliation(s)
- I. H. Ibrahim
- Institut für Physikalische Chemie, Technische Hochschule, Darmstadt
| | - W. Haase
- Institut für Physikalische Chemie, Technische Hochschule, Darmstadt
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20
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Mergehenn R, Haase W. Kristallstruktur von α-Bromo(2-dibutylaminoäthanolato)kupfer(II) / The Crystal Structure of a-Bromo(2-dibutylaminoethanolato)copper(II). ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znb-1975-3-403] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The crystal structure of α-Bromo(2-dibutylaminoethanolato)copper(II) has been determined by single-crystal X-ray diffractometer methods using 1488 independent reflexions and MoKα radiation. The compound crystallized in the orthorhombic space group P212121 with four dimers in a unit cell of dimensions a = 21.235(13), b = 15.220(8) and c = 8.390(5) Å. The structure was refined by least-squares methods giving a final residue of R = 0.087. The dimer molecules with Cu-Cu-separations of 3.019(4) Å consist of nonplanar Cu2O2-rings with Cu-O-distances of 1.92(2) Å (mean value). The coordination around each copper atom is distorted square planar. The averaged Cu-N-distance is 2.06(2) Å and Cu-Br-separations are 2.333(4) A. In good agreement with the calculated density of 1.55 g cm-3 is the experimental value of 1.53(3) g cm-3.
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Affiliation(s)
- R. Mergehenn
- Physikalische Chemie I der Technischen Hochschule Darmstadt
| | - W. Haase
- Physikalische Chemie I der Technischen Hochschule Darmstadt
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21
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Haase W, Mergehenn R, Krell W. Die Kristallstruktur von Thiocyanato(2-dimethylaminoäthanolato)kupfer(II) / The Crystal Structure of Thiocyanato(2-dimethylaminoethanalato)copper(II). ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znb-1976-0115] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The crystal structure of the title compound has been determined from three-dimensional X-ray diffractometer data. Crystals are monoclinic, space group P21/c with 8 Cu(C4H10NO)SCN units in a cell of dimensions α = 11.951(4), b = 8.954(3), c = 16.805(6) Å, and β = 107.5(1)°. The structure was refined by least squares techniques to a final discrepancy factor of 0.041 based on 2234 observed independent reflexions.
The compound is polymeric with copper atoms alternately bridged by two oxygen atoms and two thiocyanato groups. The coordination geometry around each copper atom is distorted square pyramidal. The basal plane consists of the two bridging oxygen atoms (mean value Cu-O: 1.914(3) Å), the amino nitrogen atom (mean value Cu-N: 2.035(3) Å) and the nitrogen atom from the thiocyanato group (mean value Cu-N: 1.908(3) Å) while the axial coordination site is occupied by a sulfur atom from a thiocyanato group (mean value Cu-S: 2.979(2) Å) centrosymmetric to the first.
The magnetic susceptibility of the compound shows a broad maximum at 200 K
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Affiliation(s)
- W. Haase
- Physikalische Chemie I der Technischen Hochschule Darmstadt
| | - R. Mergehenn
- Physikalische Chemie I der Technischen Hochschule Darmstadt
| | - W. Krell
- Physikalische Chemie I der Technischen Hochschule Darmstadt
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22
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Mergehenn R, Merz L, Haase W. Die Kristall- und Molekülstruktur von β -Bromo(2-diäthylaminoäthanolato)kupfer(ll) / The Crystal and Molecular Structure of β-Bromo(2-diethylaminoethanolato)copper(II). Zeitschrift für Naturforschung B 2014. [DOI: 10.1515/znb-1975-1-205] [Citation(s) in RCA: 4] [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] [Indexed: 11/15/2022]
Abstract
The crystal and molecular structure of β-bromo(diethylaminoethanolato)copper(II) has been determined from three dimensional X-ray diffractometer data. The compound crystallizes in the triclinic space group Pï with one dimer in a unit cell of dimensions α=10.180(II), b=7.999(9), c=6.227(7) Å and a=110.69(4), β=103.12(4), γ=73.82(4)[°]. The structure was refined by least-squares methods using 1944 independent reflexions to give a final R-index of 0,05. The molecule consists of dimeric Cu2O2-units with Cu—O distances of 1.900(4) Å and 1.914(4) A, respectively. The dimers are additional bridged by bromines, so that a “polymeric” structure results; Cu—Br distances are 2.357(2) and 3.660(2) A, respectively. The Cu—Cu distances are 3.003(2) (oxygen bridges) and 4.506(2) Å (bromine bridges).
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Affiliation(s)
- R. Mergehenn
- Physikalische Chemie I der Technischen Hochschule Darmstadt
| | - L. Merz
- Physikalische Chemie I der Technischen Hochschule Darmstadt
| | - W. Haase
- Physikalische Chemie I der Technischen Hochschule Darmstadt
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23
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Merz L, Haase W. Different Temperature Dependence of Magnetic Susceptibility of Different Molecular Complexes of Copper (II) with 7-Hydroxy-4-methyl-5-aza-hept-4-en-2-on. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/zna-1976-0211] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Two principally different molecular structures in the crystalline state are known from the copper (II) complex with 7-hydroxy-4-methyl-5-aza-hept-4-en-2-on. The magnetic susceptibilities of three forms of this compound [α-(CuEIA)4, β-(CuEIA)4, and β-(CuEIA)4·2 C6H6] have been measured in the temperature range 2.6-300 K. The results indicate that principally different molecular structures correspond to principally different magnetic properties. While the α-form shows antiferromagnetic spin coupling in the S′ = 0 ground state, the electrons in the β-form are coupled ferromagnetically in the S′ = 2 ground state. A fitting procedure of a theoretical equation based on the isotropic HDVV-model led to a satisfactory agreement between calculated and experimental data for α-(CuEIA)4 and β-(CuEIA)4 , while this was not possible for β-(CuEIA)4·2C6H6 . The exchange parameters obtained for α-(CuEIA)4 (g=2.13, J12= -17cm-1, J13=+3.5cm-1, and Na=60-10-8 cgs-emu) are in good agreement with the values given by Ginsberg et al. For β-(CuEIA)4 a weak antiferromagnetic intercluster interaction could be determined at low temperatures. The fitting procedure yielded the following values: g=2.05, J12=-6.4 cm-1, J13=+24.2 cm-1, Na=10·10-6 cgs-emu, ⊖=-0.27°.
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Affiliation(s)
- L. Merz
- Physikalische Chemie I der TH Darmstadt
| | - W. Haase
- Physikalische Chemie I der TH Darmstadt
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24
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Rasna MV, Zuhail KP, Manda R, Paik P, Haase W, Dhara S. Discontinuous anchoring transition and photothermal switching in composites of liquid crystals and conducting polymer nanofibers. Phys Rev E Stat Nonlin Soft Matter Phys 2014; 89:052503. [PMID: 25353811 DOI: 10.1103/physreve.89.052503] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Indexed: 06/04/2023]
Abstract
We prepared nanocomposites of a nematic liquid crystal and nanofibers of a conducting polymer (polyaniline). All the nanocomposites exhibit a discontinuous surface anchoring transition from planar to homeotropic in the nematic phase on a perfluoropolymer coated surface with a thermal hysteresis (≈ 5.3 °C). We observe a relatively large bistable conductivity and demonstrate a light driven switching of conductivity and dielectric constant in dye doped nanocomposites in the thermal hysteresis (bistable) region. The experimental results have been explained based on the reorientation of the nanofibers driven by the anchoring transition of the nematic liquid crystal. We show a significant enhancement of the bistable temperature range (≈ 13 °C) by an appropriate choice of compound in the binary system.
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Affiliation(s)
- M V Rasna
- School of Physics, University of Hyderabad, Hyderabad 500046, India
| | - K P Zuhail
- School of Physics, University of Hyderabad, Hyderabad 500046, India
| | - R Manda
- School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad 500046, India
| | - P Paik
- School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad 500046, India
| | - W Haase
- Darmstadt University of Technology, Eduard Zintl Institute for Inorganic and Physical Chemistry, Petersenstrasse 20, Darmstadt 64287, Germany
| | - Surajit Dhara
- School of Physics, University of Hyderabad, Hyderabad 500046, India
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25
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Shukla R, Feng X, Umadevi S, Hegmann T, Haase W. Influence of different amount of functionalized bulky gold nanorods dopant on the electrooptical, dielectric and optical properties of the FLC host. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.03.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Sedlmayer F, Sautter-Bihl ML, Budach W, Dunst J, Fastner G, Feyer P, Fietkau R, Haase W, Harms W, Souchon R, Wenz F, Sauer R. DEGRO practical guidelines: radiotherapy of breast cancer I: radiotherapy following breast conserving therapy for invasive breast cancer. Strahlenther Onkol 2014; 189:825-33. [PMID: 24002382 PMCID: PMC3825416 DOI: 10.1007/s00066-013-0437-8] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Background and purpose The aim of the present paper is to update the practical guidelines for postoperative adjuvant radiotherapy of breast cancer published in 2007 by the breast cancer expert panel of the German Society for Radiooncology (Deutsche Gesellschaft für Radioonkologie, DEGRO). The present recommendations are based on a revision of the German interdisciplinary S-3 guidelines published in July 2012. Methods A comprehensive survey of the literature concerning radiotherapy following breast conserving therapy (BCT) was performed using the search terms “breast cancer”, “radiotherapy”, and “breast conserving therapy”. Data from lately published meta-analyses, recent randomized trials, and guidelines of international breast cancer societies, yielding new aspects compared to 2007, provided the basis for defining recommendations according to the criteria of evidence-based medicine. In addition to the more general statements of the DKG (Deutsche Krebsgesellschaft), this paper addresses indications, target definition, dosage, and technique of radiotherapy of the breast after conservative surgery for invasive breast cancer. Results Among numerous reports on the effect of radiotherapy during BCT published since the last recommendations, the recent EBCTCG report builds the largest meta-analysis so far available. In a 15 year follow-up on 10,801 patients, whole breast irradiation (WBI) halves the average annual rate of disease recurrence (RR 0.52, 0.48–0.56) and reduces the annual breast cancer death rate by about one sixth (RR 0.82, 0.75–0.90), with a similar proportional, but different absolute benefit in prognostic subgroups (EBCTCG 2011). Furthermore, there is growing evidence that risk-adapted dose augmentation strategies to the tumor bed as well as the implementation of high precision RT techniques (e.g., intraoperative radiotherapy) contribute substantially to a further reduction of local relapse rates. A main focus of ongoing research lies in partial breast irradiation strategies as well as WBI hypofractionation schedules. The potential of both in replacing normofractionated WBI has not yet been finally clarified. Conclusion After breast conserving surgery, no subgroup even in low risk patients has yet been identified for whom radiotherapy can be safely omitted without compromising local control and, hence, cancer-specific survival. In most patients, this translates into an overall survival benefit.
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Affiliation(s)
- F Sedlmayer
- Department of Radiotherapy and Radiation Oncology, LKH Salzburg, Paracelsus Medical University Hospital, Muellner Haupstr. 48, Salzburg, Austria,
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Shukla RK, Liebig CM, Evans DR, Haase W. Electro-optical behaviour and dielectric dynamics of harvested ferroelectric LiNbO3 nanoparticle-doped ferroelectric liquid crystal nanocolloids. RSC Adv 2014. [DOI: 10.1039/c4ra00183d] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Souchon R, Sautter-Bihl ML, Sedlmayer F, Budach W, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Wenz F, Sauer R. DEGRO practical guidelines: radiotherapy of breast cancer II. Strahlenther Onkol 2013; 190:8-16. [DOI: 10.1007/s00066-013-0502-3] [Citation(s) in RCA: 16] [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: 11/28/2022]
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29
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Haase W, Kaupke P, Petzold G. Leserbrief. Klin Monbl Augenheilkd 2013; 230:1044-5. [DOI: 10.1055/s-0033-1350683] [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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Goswami D, Sinha D, Debnath A, Mandal P, Gupta S, Haase W, Ziobro D, Dabrowski R. Molecular and dynamical properties of a perfluorinated liquid crystal with direct transition from ferroelectric SmC⁎ phase to isotropic phase. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2013.03.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Sedlmayer F, Sautter-Bihl M, Budach W, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Rödel C, Souchon R, Wenz F, Sauer R. Erratum to: Is the simultaneously integrated boost (SIB) technique for early breast cancer ready to be adopted for routine adjuvant radiotherapy? Strahlenther Onkol 2013. [DOI: 10.1007/s00066-013-0349-7] [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: 11/28/2022]
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Abstract
Hypermetropia of more than 5 diopters or an astigmatism of 2 diopters or more is often the cause of amblyopia in the master eye, independent of the presence of a simultaneous strabismus or anisometropia. This amblyopia can be prevented with early spectacle correction. In the authors' study of 218 patients with high ametropia a correlation was not always present between visual acuity and the age of the first spectacle correction or the degree of ametropia. In some patients even correction of ametropia as late as seven to ten years of age led to spontaneous functional improvement of single optotypes acuity. The treatment of choice is to give the full ametropic correction at an early age.
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Affiliation(s)
- H Cavazos
- University Eye Clinic Hamburg, Department of Pleoptics and Orthoptics, Hamburg, Germany
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Tomkowicz Z, Rams M, Bałanda M, Foro S, Nojiri H, Krupskaya Y, Kataev V, Büchner B, Nayak SK, Yakhmi JV, Haase W. Slow Magnetic Relaxations in Manganese(III) Tetra(meta-fluorophenyl)porphyrin-tetracyanoethenide. Comparison with the Relative Single Chain Magnet ortho Compound. Inorg Chem 2012; 51:9983-94. [DOI: 10.1021/ic3014927] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Z. Tomkowicz
- Institute of Physics, Jagiellonian University,
Reymonta 4, 30-059 Kraków, Poland
| | - M. Rams
- Institute of Physics, Jagiellonian University,
Reymonta 4, 30-059 Kraków, Poland
| | - M. Bałanda
- H. Niewodniczański Institute of Nuclear Physics
PAN, Radzikowskiego 152, 31-342 Kraków, Poland
| | - S. Foro
- Clemens-Schöpf-Institut für Organische
Chemie und Biochemie, Technische Universität Darmstadt, Petersenstrasse
22, D-64287 Darmstadt, Germany
| | - H. Nojiri
- Institute for Materials Research, Tohoku University, Katahira 2-1-1,
Sendai 980-8577, Japan
| | - Y. Krupskaya
- Institute for Solid State Physics, IFW Dresden, Helmholtzstrasse
20, D-01069 Dresden, Germany
| | - V. Kataev
- Institute for Solid State Physics, IFW Dresden, Helmholtzstrasse
20, D-01069 Dresden, Germany
| | - B. Büchner
- Institute for Solid State Physics, IFW Dresden, Helmholtzstrasse
20, D-01069 Dresden, Germany
| | - S. K. Nayak
- Eduard-Zintl-Institut
für Anorganische und Physikalische Chemie, Technische Universität
Darmstadt, Petersenstrasse 20, D-64287 Darmstadt, Germany
| | - J. V. Yakhmi
- Technical Physics & Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai -400 085, India
| | - W. Haase
- Eduard-Zintl-Institut
für Anorganische und Physikalische Chemie, Technische Universität
Darmstadt, Petersenstrasse 20, D-64287 Darmstadt, Germany
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Sautter-Bihl ML, Sedlmayer F, Budach W, Dunst J, Feyer P, Fietkau R, Haase W, Harms W, Rödel C, Souchon R, Wenz F, Sauer R. One life saved by four prevented recurrences? Update of the Early Breast Cancer Trialists confirms: postoperative radiotherapy improves survival after breast conserving surgery. Strahlenther Onkol 2012; 188:461-3. [PMID: 22441440 DOI: 10.1007/s00066-012-0092-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Tomkowicz Z, Ostrovsky S, Foro S, Calvo-Perez V, Haase W. Magnetooptical and Structural Investigations of Five Dimeric Cobalt(II) Complexes Mimicking Metalloenzyme Active Sites. Inorg Chem 2012; 51:6046-55. [DOI: 10.1021/ic202529p] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Z. Tomkowicz
- Eduard-Zintl-Institute
of Inorganic and Physical Chemistry, Darmstadt University of Technology, Petersenstrasse 20, 64287
Darmstadt, Germany
- Institute of Physics, Jagiellonian University, Reymonta 4,
30-059 Kraków, Poland
| | - S. Ostrovsky
- Eduard-Zintl-Institute
of Inorganic and Physical Chemistry, Darmstadt University of Technology, Petersenstrasse 20, 64287
Darmstadt, Germany
- Institute of Applied
Physics, Academy of Sciences of Moldova, Academy str. 5, MD-2028 Chisinau, Moldova
| | - S. Foro
- Clemens-Schoepf-Institute
of Organic Chemistry and Biochemistry, Darmstadt University of Technology, Petersenstrasse 23, 64287
Darmstadt, Germany
| | - V. Calvo-Perez
- Facultad Ciencias
Químicas y Farmacéuticas, Universidad de Chile, Casilla 233, Santiago, Chile
| | - W. Haase
- Eduard-Zintl-Institute
of Inorganic and Physical Chemistry, Darmstadt University of Technology, Petersenstrasse 20, 64287
Darmstadt, Germany
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Sautter-Bihl ML, Sedlmayer F, Budach W, Dunst J, Engenhart-Cabillic R, Fietkau R, Feyer P, Haase W, Harms W, Rödel C, Souchon R, Wenz F, Sauer R. Intraoperative radiotherapy as accelerated partial breast irradiation for early breast cancer : beware of one-stop shops? Strahlenther Onkol 2011; 186:651-7. [PMID: 21127826 DOI: 10.1007/s00066-010-8001-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Intraoperative radiotherapy (IORT) was originally introduced in breast cancer treatment as an "anticipated boost" during the procedure of breast conserving surgery (BCS). In addition to whole breast irradiation (WBI), it has yielded excellent long-term results [31, 38]. Under the assumption that the majority of in-breast tumor recurrences (IBTR) occur in the originally affected site, accelerated partial breast irradiation (APBI) as the sole treatment modality was initiated in several studies and with different techniques, one of which was IORT first with electrons, later also with conventional x-rays [29]. The question whether and for whom the gold standard of WBI may be replaced by APBI - especially IORT - alone has recently been one of the most controversial issues of adjuvant therapy for breast cancer. Two recently published studies by Veronesi et al. [36] and Vaidya et al. [35] presenting shortterm results of single shot IORT with electrons (ELIOT) and with an orthovoltage system (TARGIT), respectively, have further invigorated this discussion as illustrated by several letters to the editor commenting on the TARGIT study. While Vaidya et al. [35] indicate their results of IORT alone as "an alternative to WBI for selected patients" and one editorial even proclaims it as standard [6], all the authors of the respective letters [10, 16, 27, 33] strongly disagree with this conclusion. The present editorial comments on the two publications and, furthermore, provides respective statements of the breast cancer expert panel of the German Society of Radiation Oncology (DEGRO).
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Ostrovsky S, Tomkowicz Z, Haase W. Exchange-Coupled Cobalt(II) Dimer with Unusual Magnetic Circular Dichroism Saturation Behavior. Inorg Chem 2010; 49:6942-7. [DOI: 10.1021/ic100556p] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. Ostrovsky
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Darmstadt University of Technology, Petersenstrasse 20, 64287 Darmstadt, Germany
- Institute of Applied Physics, Academy of Sciences of Moldova, Academy 5, MD-2028 Chisinau, Moldova
| | - Z. Tomkowicz
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Darmstadt University of Technology, Petersenstrasse 20, 64287 Darmstadt, Germany
- Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
| | - W. Haase
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Darmstadt University of Technology, Petersenstrasse 20, 64287 Darmstadt, Germany
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Knyazev AA, Dzhabarov VI, Lapaev DV, Lobkov VS, Haase W, Galyametdinov YG. New nematogenic β-diketones for synthesis of lanthanidomesogens. RUSS J GEN CHEM+ 2010. [DOI: 10.1134/s1070363210040122] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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42
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Saal C, Mohanta S, Nag K, Dutta SK, Werner R, Haase W, Duin E, Johnson MK. Magnetic investigations on a valence-delocalized dinuclear Fe(II)-Fe(III) complex. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19961001228] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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43
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Hanemann T, Haase W. Guest-host-mixtures: A correlation between the dye's order parameter with thermodynamic and structural quantities. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19940980411] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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44
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Fleischhauer P, Gehring S, Haase W. Magnetic and EPR Spectroscopic Investigations on a Ferromagnetic Coupled Trinuclear Cu(II) Complex. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19920961133] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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45
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Klämke W, Fan ZX, Haase W, Müller HJ, Gallardo H. An Experimental Setup for X-ray Investigations on Higher Ordered Liquid Crystals. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19890930410] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Merz L, Haase W, Keller G. Magnetische Eigenschaften tetramerer Halogeno(2-dialkylaminoäthanolato)kupfer(II)-Komplexe vom Kubantyp. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19760800408] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Zhao G, Johnson MC, Schnell JR, Kanaoka Y, Haase W, Irikura D, Lam BK, Schmidt-Krey I. Two-dimensional crystallization conditions of human leukotriene C4 synthase requiring adjustment of a particularly large combination of specific parameters. J Struct Biol 2009; 169:450-4. [PMID: 19903529 DOI: 10.1016/j.jsb.2009.11.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2009] [Revised: 11/03/2009] [Accepted: 11/05/2009] [Indexed: 11/29/2022]
Abstract
Human leukotriene C(4) synthase (LTC(4)S) forms highly ordered two-dimensional (2D) crystals under specific reconstitution conditions. It was found that control of a larger number of parameters than is usually observed for 2D crystallization of membrane proteins was necessary to induce crystal formation of LTC(4)S. Here, we describe the parameters that were optimized to yield large and well-ordered 2D crystals of LTC(4)S. Careful fractioning of eluates during the protein purification was essential for obtaining crystals. While the lipid-to-protein ratio was critical in obtaining order, four parameters were decisive in inducing growth of crystals that were up to several microns in size. To obtain a favorable diameter, salt, temperature, glycerol, and initial detergent concentration had to be controlled with great care. Interestingly, several crystal forms could be grown, namely the plane group symmetries of p2, p3, p312, and two different unit cell sizes of plane group symmetry p321.
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Affiliation(s)
- G Zhao
- Georgia Institute of Technology, School of Biology, School of Chemistry and Biochemistry, 310 Ferst Drive, Atlanta, GA 30332, USA
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Wenz F, Budach W, Dunst J, Feyer P, Haase W, Harms W, Sautter-Bihl ML, Sedlmayer F, Souchon R, Sauer R. Accelerated partial-breast irradiation (APBI)--ready for prime time? Strahlenther Onkol 2009; 185:653-5. [PMID: 19806329 DOI: 10.1007/s00066-009-8002-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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