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radiation radiotherapy

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https://www.readbyqxmd.com/read/29224044/pattern-of-care-and-impact-of-prognostic-factors-on-the-outcome-of-head-and-neck-extramedullary-plasmacytoma-a-systematic-review-and-individual-patient-data-analysis-of-315-cases
#1
Bhanuprasad Venkatesulu, Supriya Mallick, Prashanth Giridhar, Ashish Dutt Upadhyay, Goura K Rath
INTRODUCTION: Head and neck extramedullary plasmacytoma is a rare localized plasma cell neoplasm. We intended to perform this review of the published literature to assess the demographic profile, pattern of care and survival outcomes. METHODS: Two authors independently searched PubMed, Google search and Cochrane library for eligible studies from 1950 till July 1, 2016, published in English language. RESULTS: Median age of the cohort was 57 years (range 11-85)...
December 9, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/29223525/case-series-of-rare-thymoma-metastases-to-the-spine-and-complete-literature-review
#2
Rebecca L Achey, Bryan S Lee, Swetha Sundar, Edward C Benzel, Ajit A Krishnaney
BACKGROUND: We report a series of three cases of metastatic thymoma to the spine with spinal cord compression. An extensive literature review of thymic metastases to the spine was completed in order to provide a comprehensive appraisal of current prognostic indicators and potential treatment algorithms to help guide clinicians in treatment management. CASE DESCRIPTIONS: Between 2000 and 2017, three patients were diagnosed with thymic metastases to the spine at our institution...
December 6, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29223302/modeling-the-target-dose-fall-off-in-imrt-and-vmat-planning-techniques-for-cervical-sbrt
#3
A Brito Delgado, D Cohen, T Y Eng, D N Stanley, Z Shi, M Charlton, A N Gutiérrez
There has been growing interest in the use of stereotactic body radiotherapy (SBRT) technique for the treatment of cervical cancer. The purpose of this study was to characterize dose distributions as well as model the target dose fall-off for intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) delivery techniques using 6 and 10 MV photon beam energies. Fifteen (n = 15) patients with non-bulky cervical tumors were planned in Pinnacle3 with a Varian Novalis Tx (HD120 MLC) using 6 and 10 MV photons with the following techniques: (1) IMRT with 10 non-coplanar beams (2) dual, coplanar 358° VMAT arcs (4° spacing), and (3) triple, non-coplanar VMAT arcs...
December 6, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29223168/serious-gastric-perforation-after-second-stereotactic-body-radiotherapy-for-peripheral-lung-cancer-that-recurred-after-initial-stereotactic-body-radiotherapy-a-case-report
#4
Hotaka Nonaka, Hiroshi Onishi, Masatoki Ozaki, Kengo Kuriyama, Takafumi Komiyama, Ryo Saito
BACKGROUND: In recent reports, re-irradiation with stereotactic body radiotherapy for lung tumors in patients previously treated with thoracic radiation therapy resulted in several serious toxicities. Serious non-lung toxicities were observed mostly in patients with central tumors, but we experienced a case of fatal gastric perforation after a second stereotactic body radiotherapy in a patient with a peripheral lung tumor. CASE PRESENTATION: An 83-year-old Asian man was diagnosed with T2N0M0 lung cancer in the form of squamous cell carcinoma in the lower lobe of his left lung...
December 10, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/29222833/association-between-measures-of-treatment-quality-and-disease-progression-in-prostate-cancer-radiotherapy-an-exploratory-analysis-from-the-trog-03-04-radar-trial
#5
Marco Marcello, Martin A Ebert, Annette Haworth, Allison Steigler, Angel Kennedy, Max Bulsara, Rachel Kearvell, David J Joseph, James W Denham
INTRODUCTION: Quality assurance methods are incorporated into multicentre radiotherapy clinical trials for ensuring consistent application of trial protocol and quantifying treatment uncertainties. The study's purpose was to determine whether post-treatment disease progression is associated with measures of the quality of radiotherapy treatment. METHODS: The TROG 03.04 RADAR trial tested the impact of androgen deprivation on prostate cancer patients receiving dose-escalated external beam radiation therapy...
December 8, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/29222711/%C3%A3-gro-survey-on-radiotherapy-capacity-in-austria-status-quo-and-estimation-of-future-demands
#6
Brigitte Zurl, Anja Bayerl, Alexander De Vries, Hans Geinitz, Robert Hawliczek, Tomas-Henrik Knocke-Abulesz, Peter Lukas, Richard Pötter, Wolfgang Raunik, Brigitte Scholz, Annemarie Schratter-Sehn, Felix Sedlmayer, Dietmar Seewald, Edgar Selzer, Karin S Kapp
BACKGROUND: A comprehensive evaluation of the current national and regional radiotherapy capacity in Austria with an estimation of demands for 2020 and 2030 was performed by the Austrian Society for Radiation Oncology, Radiobiology and Medical Radiophysics (ÖGRO). MATERIALS AND METHODS: All Austrian centers provided data on the number of megavoltage (MV) units, treatment series, fractions, percentage of retreatments and complex treatment techniques as well as the daily operating hours for the year 2014...
December 8, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/29222678/dose-responses-for-mortality-from-cerebrovascular-and-heart-diseases-in-atomic-bomb-survivors-1950-2003
#7
Helmut Schöllnberger, Markus Eidemüller, Harry M Cullings, Cristoforo Simonetto, Frauke Neff, Jan Christian Kaiser
The scientific community faces important discussions on the validity of the linear no-threshold (LNT) model for radiation-associated cardiovascular diseases at low and moderate doses. In the present study, mortalities from cerebrovascular diseases (CeVD) and heart diseases from the latest data on atomic bomb survivors were analyzed. The analysis was performed with several radio-biologically motivated linear and nonlinear dose-response models. For each detrimental health outcome one set of models was identified that all fitted the data about equally well...
December 8, 2017: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/29222306/therapy-of-primary-cns-lymphoma-role-of-intensity-radiation-and-novel-agents
#8
REVIEW
Andrés José María Ferreri
Primary central nervous system (CNS) lymphomas represent a subgroup of malignancies with specific characteristics, an aggressive course, and unsatisfactory outcome in contrast with other lymphomas comparable for tumor burden and histological type. Despite the high sensitivity to conventional chemotherapy and radiotherapy, remissions are frequently short lasting. Treatment efficacy is limited by several factors, including the biology and microenvironment of this malignancy and the "protective" effect of the blood-brain barrier, which limits the access of most drugs to the CNS...
December 8, 2017: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/29222038/hdac6-inhibition-induces-glioma-stem-cells-differentiation-and-enhances-cellular-radiation-sensitivity-through-the-shh-gli1-signaling-pathway
#9
Wei Yang, Yingying Liu, Ruoling Gao, Hongquan Yu, Ting Sun
The existence of small numbers of stem-like cells, called glioma stem cells (GSCs), in human glioblastoma multiforme (GBM) is responsible for recurrence due to resistance to radiotherapy and chemotherapy. Inhibition of histone deacetylase 6 (HDAC6) enhanced radiosensitivity of cancer cells. However, the effect of inhibiting HDAC6 on stemness and radioresistance of GSCs and its molecular mechanism are largely unknown. In the present study, we found that HDAC6 was upregulated in GSCs comparing to non-stem tumor cells...
December 5, 2017: Cancer Letters
https://www.readbyqxmd.com/read/29221951/role-of-drugs-in-the-prevention-and-amelioration-of-radiation-induced-toxic-effects
#10
REVIEW
Rakesh Raman Patyar, Sazal Patyar
As the use of radiation technology for nuclear warfare or for the benefits of mankind (e.g. in radiotherapy or radio-diagnosis) is increasing tremendously, the risk of associated side effects is becoming a cause of concern. These effects, ranging from nausea/vomiting to death, may result from accidental or deliberate exposure and begin in seconds. Through this review paper, efforts have been done to critically review different compounds which have been investigated as radioprotectors and radiation mitigators...
December 5, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29221676/prospective-medical-analysis-of-radiation-therapist-image-repositioning-during-image-guided-radiotherapy
#11
O Lauche, F Castan, H de Forges, C Guillaumon, S Gourgou, P Fenoglietto, N Aillères, D Azria, O Riou
PURPOSE: Radiation oncologists are responsible for deciding which day-to-day variations are acceptable or not in the treatment setup. However, properly qualified and trained radiation therapists might be capable to perform image registration. We evaluated in our centre the capability and accuracy of radiation therapists to validate positioning images in a prospective study. METHODS AND PATIENTS: A total of 84 patients treated for prostate, head and neck, lung or breast cancer was prospectively and randomly included from July 2011 to July 2013 in radiotherapy unit of our institution...
December 5, 2017: Cancer Radiothérapie: Journal de la Société Française de Radiothérapie Oncologique
https://www.readbyqxmd.com/read/29221323/management-of-non-small-cell-lung-cancer-with-egfr-mutation-the-role-of-radiotherapy-in-the-era-of-tyrosine-kinase-inhibitor-therapy-opportunities-and-challenges
#12
REVIEW
Bing Xia, Shirong Zhang, Shenglin Ma
In recent years, the treatment of advanced non-small cell lung cancer (NSCLC) was greatly promoted by the discovery of oncogenic drivers and the development of targeted therapies specific for these drivers. Somatic mutations in epidermal growth factor receptor (EGFR) are the most common type in patients with NSCLC. Small-molecule tyrosine kinase inhibitor (TKI) targeting EGFR produced relatively high response rate and long duration with acceptable toxicity profile. Also, the life expectancy in patients with active EGFR mutation has been significantly prolonged than the past...
September 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29220828/prediction-of-radiation-esophagitis-in-non-small-cell-lung-cancer-using-clinical-factors-dosimetric-parameters-and-pretreatment-cytokine-levels
#13
Peter G Hawkins, Philip S Boonstra, Stephen T Hobson, James A Hayman, Randall K Ten Haken, Martha M Matuszak, Paul Stanton, Gregory P Kalemkerian, Theodore S Lawrence, Matthew J Schipper, Feng-Ming Spring Kong, Shruti Jolly
Radiation esophagitis (RE) is a common adverse event associated with radiotherapy for non-small cell lung cancer (NSCLC). While plasma cytokine levels have been correlated with other forms of radiation-induced toxicity, their association with RE has been less well studied. We analyzed data from 126 patients treated on 4 prospective clinical trials. Logistic regression models based on combinations of dosimetric factors [maximum dose to 2 cubic cm (D2cc) and generalized equivalent uniform dose (gEUD)], clinical variables, and pretreatment plasma levels of 30 cytokines were developed...
December 5, 2017: Translational Oncology
https://www.readbyqxmd.com/read/29220067/gene-expression-and-fatigue-in-puerto-rican-men-during-radiotherapy-for-prostate-cancer-an-exploratory-study
#14
Velda J Gonzalez, Leorey N Saligan, Brooke L Fridley, Humberto Ortiz-Zuazaga, Lauren S Aaronson
OBJECTIVE: To examine the trajectory of fatigue experienced by 26 Puerto Rican (PR) men over the course of External Beam Radiation Therapy (EBRT) and to assess gene expression changes from baseline to midpoint of EBRT using microarray technology. Design/Research Approach- Prospective exploratory and comparative design study. Setting- RT facility located in San Juan, PR. Sample/Participants-26 PR men with non-metastatic prostate cancer. METHODS: Participants completed 2 paper forms: demographics and the Spanish version of the 13-item FACT-fatigue at baseline, midpoint, and end of EBRT...
December 2017: Puerto Rico Health Sciences Journal
https://www.readbyqxmd.com/read/29219655/track-to-the-future-historical-perspective-on-the-importance-of-radiation-track-structure-and-dna-as-a-radiobiological-target
#15
Mark A Hill
PURPOSE: Understanding the mechanisms behind induced biological response following exposure to ionizing radiation is not only important in assessing the risk associated with human exposure, but potentially can help identify ways of improving the efficacy of radiotherapy. Over the decades, there has been much discussion on what is the key biological target for radiation action and its associated size. It was already known in the 1930s that microscopic features of radiation significantly influenced biological outcomes...
December 8, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/29219117/prediction-of-radiation-necrosis-in-a-rodent-model-using-magnetic-resonance-imaging-apparent-transverse-relaxation-r-sub-2-sub-sup-sup
#16
Jean-Guy Belliveau, Michael D Jensen, James M P Stewart, Igor Solovey, Martyn L Klassen, Glenn S Bauman, Ravi S Menon
Radiation necrosis remains an irreversible long-term side-effect following radiotherapy to the brain. The ability to predict areas that could ultimately develop into necrosis could lead to prevention and management of radiation necrosis. Materials and Methods: Fischer 344 rats were irradiated using two platforms (micro-CT irradiator and x-RAD 225 IGRT) with radiation up to 30 Gy for the micro-CT and 40 Gy for the xRAD-224 to half the brain. Animals were subsequently imaged using a 9.4T MRI scanner every 2-4 weeks for up to 28 weeks using a 7-echo gradient echo sequence...
December 8, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29218592/mathematical-modeling-of-the-effects-of-tumor-heterogeneity-on-the-efficiency-of-radiation-treatment-schedule
#17
Farinaz Forouzannia, Heiko Enderling, Mohammad Kohandel
Radiotherapy uses high doses of energy to eradicate cancer cells and control tumors. Various treatment schedules have been developed and tried in clinical trials, yet significant obstacles remain to improving the radiotherapy fractionation. Genetic and non-genetic cellular diversity within tumors can lead to different radiosensitivity among cancer cells that can affect radiation treatment outcome. We propose a minimal mathematical model to study the effect of tumor heterogeneity and repair in different radiation treatment schedules...
December 7, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/29218271/magnetic-resonance-imaging-in-precision-radiation-therapy-for-lung-cancer
#18
REVIEW
Hannah Bainbridge, Ahmed Salem, Rob H N Tijssen, Michael Dubec, Andreas Wetscherek, Corinne Van Es, Jose Belderbos, Corinne Faivre-Finn, Fiona McDonald
Radiotherapy remains the cornerstone of curative treatment for inoperable locally advanced lung cancer, given concomitantly with platinum-based chemotherapy. With poor overall survival, research efforts continue to explore whether integration of advanced radiation techniques will assist safe treatment intensification with the potential for improving outcomes. One advance is the integration of magnetic resonance imaging (MRI) in the treatment pathway, providing anatomical and functional information with excellent soft tissue contrast without exposure of the patient to radiation...
December 2017: Translational Lung Cancer Research
https://www.readbyqxmd.com/read/29218269/blood-based-biomarkers-for-precision-medicine-in-lung-cancer-precision-radiation-therapy
#19
REVIEW
Dirk De Ruysscher, Jianyue Jin, Tim Lautenschlaeger, Jin-Xiong She, Zhongxing Liao, Feng-Ming Spring Kong
Both tumors and patients are complex and models that determine survival and toxicity of radiotherapy or any other treatment ideally must take into account this variability as well as its dynamic state. The genetic features of the tumor and the host, and increasingly also the epi-genetic and proteomic characteristics, are being unraveled. Multiple techniques, including histological examination, blood sampling, measurement of circulating tumor cells (CTCs), and functional and molecular imaging, can be used for this purpose...
December 2017: Translational Lung Cancer Research
https://www.readbyqxmd.com/read/29218267/radiomics-in-precision-medicine-for-lung-cancer
#20
REVIEW
Julie Constanzo, Lise Wei, Huan-Hsin Tseng, Issam El Naqa
With the improvement of external radiotherapy delivery accuracy, such as intensity-modulated and stereotactic body radiation therapy, radiation oncology has recently entered in the era of precision medicine. Despite these precise irradiation modalities, lung cancers remain one of the most aggressive human cancers worldwide, possibly because of diverse genotypic alterations that drive and maintain lung tumorigenesis. It has been long recognized that imaging could aid in the diagnosis, tumor delineation, and monitoring of lung cancer...
December 2017: Translational Lung Cancer Research
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