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Radiation safety

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https://www.readbyqxmd.com/read/29785231/advantages-of-evaluating-%C3%AE-h2ax-induction-in-non-clinical-drug-development
#1
REVIEW
Shigeki Motoyama, Akira Takeiri, Kenji Tanaka, Asako Harada, Kaori Matsuzaki, Junko Taketo, Saori Matsuo, Etsuko Fujii, Masayuki Mishima
γH2AX, the phosphorylated form of a histone variant H2AX at Ser 139, is already widely used as a biomarker to research the fundamental biology of DNA damage and repair and to assess the risk of environmental chemicals, pollutants, radiation, and so on. It is also beginning to be used in the early non-clinical stage of pharmaceutical drug development as an in vitro tool for screening and for mechanistic studies on genotoxicity. Here, we review the available information on γH2AX-based test systems that can be used to develop drugs and present our own experience of practically applying these systems during the non-clinical phase of drug development...
2018: Genes and Environment: the Official Journal of the Japanese Environmental Mutagen Society
https://www.readbyqxmd.com/read/29782043/stereotactic-radiation-therapy-for-the-treatment-of-functional-pituitary-adenomas-associated-with-feline-acromegaly
#2
Tiffany L Wormhoudt, Mary-Keara Boss, Katharine Lunn, Lynn Griffin, Del Leary, Kristy Dowers, Sangeeta Rao, Susan M LaRue
BACKGROUND: Conventional fractionated radiotherapy has been shown to be partially effective for management of pituitary tumors in cats that cause acromegaly and diabetes mellitus (DM), but, the efficacy and safety of stereotactic radiation therapy (SRT) as a treatment for acromegalic cats has not been described. HYPOTHESIS: Stereotactic radiation therapy is an effective and safe treatment for controlling acromegaly associated with pituitary adenomas in cats. Additionally, SRT-treated acromegalic cats with DM will experience a decrease in insulin requirements after radiation therapy...
May 21, 2018: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/29779086/retrospective-study-of-nivolumab-for-patients-with-recurrent-high-grade-gliomas
#3
Megan Mantica, Ashley Pritchard, Frank Lieberman, Jan Drappatz
INTRODUCTION: Patients with recurrent high-grade gliomas (HGG) have limited treatment options. HGG utilize the PD-1 pathway to evade immune responses. Checkpoint inhibitors have demonstrated safety and clinical activity in patients with recurrent glioblastoma. We explored the efficacy of nivolumab in recurrent HGG with a primary objective of progression free survival (PFS) and overall survival (OS). METHODS: We retrospectively analyzed HGG patients treated with nivolumab in our institution...
May 19, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29779004/cancer-incidence-among-merchant-seafarers-an-extended-follow-up-of-a-danish-cohort
#4
Kajsa Ugelvig Petersen, Julie Volk, Linda Kaerlev, Henrik Lyngbeck Hansen, Johnni Hansen
OBJECTIVES: While maritime safety generally has improved dramatically over the last century, modern seafarers are still faced with numerous occupational hazards potentially affecting their risk of chronic diseases such as cancer. The aim of this study is to offer updated information on the incidence of specific cancers among both male and female seafarers. METHODS: Using records from the Danish Seafarer Registry, all seafarers employed on Danish ships during 1986-1999 were identified, resulting in a cohort of 33 084 men and 11 209 women...
May 19, 2018: Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/29778738/risk-adapted-therapy-for-young-children-with-medulloblastoma-sjyc07-therapeutic-and-molecular-outcomes-from-a-multicentre-phase-2-trial
#5
Giles W Robinson, Vasilisa A Rudneva, Ivo Buchhalter, Catherine A Billups, Sebastian M Waszak, Kyle S Smith, Daniel C Bowers, Anne Bendel, Paul G Fisher, Sonia Partap, John R Crawford, Tim Hassall, Daniel J Indelicato, Frederick Boop, Paul Klimo, Noah D Sabin, Zoltan Patay, Thomas E Merchant, Clinton F Stewart, Brent A Orr, Jan O Korbel, David T W Jones, Tanvi Sharma, Peter Lichter, Marcel Kool, Andrey Korshunov, Stefan M Pfister, Richard J Gilbertson, Robert P Sanders, Arzu Onar-Thomas, David W Ellison, Amar Gajjar, Paul A Northcott
BACKGROUND: Young children with medulloblastoma have a poor overall survival compared with older children, due to use of radiation-sparing therapy in young children. Radiotherapy is omitted or reduced in these young patients to spare them from debilitating long-term side-effects. We aimed to estimate event-free survival and define the molecular characteristics associated with progression-free survival in young patients with medulloblastoma using a risk-stratified treatment strategy designed to defer, reduce, or delay radiation exposure...
May 16, 2018: Lancet Oncology
https://www.readbyqxmd.com/read/29777432/qualitative-study-of-mechanical-parameters-of-conventional-diagnostic-x-ray-machines-in-mizoram
#6
Jonathan Lalrinmawia, Kham Suan Pau, Ramesh Chandra Tiwari
The present study examined the mechanical attributes of 135 conventional diagnostic X-ray machines in Mizoram, India. The purpose of studying the X-ray mechanical parameters, such as congruency, perpendicularity of the central beam, and half-value layer, was to improve the quality of the diagnostic image and reduce the patient dose. A battery-operated portable dosimeter was used to measure output radiation of the X-ray machine. The half-value layer was measured at a constant accelerating potential of 70 kVp and tube load...
May 18, 2018: Radiological Physics and Technology
https://www.readbyqxmd.com/read/29776675/risk-factors-for-near-miss-events-and-safety-incidents-in-pediatric-radiation-therapy
#7
Nimrah Baig, Jiangxia Wang, Shereef Elnahal, Todd McNutt, Jean Wright, Theodore DeWeese, Stephanie Terezakis
BACKGROUND AND PURPOSE: Factors contributing to safety- or quality-related incidents (e.g. variances) in children are unknown. We identified clinical and RT treatment variables associated with risk for variances in a pediatric cohort. MATERIALS AND METHODS: Using our institution's incident learning system, 81 patients age ≤21 years old who experienced variances were compared to 191 pediatric patients without variances. Clinical and RT treatment variables were evaluated as potential predictors for variances using univariate and multivariate analyses...
May 15, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29774169/phase-2-study-of-everolimus-for-relapsed-or-refractory-classical-hodgkin-lymphoma
#8
Patrick B Johnston, Lauren C Pinter-Brown, Ghulam Warsi, Kristen White, Radhakrishnan Ramchandren
Background: The current standard of care for classical Hodgkin lymphoma (HL) is multiagent chemotherapy with or without radiation. In patients who relapse or fail to respond, additional high-dose chemotherapy with autologous hematopoietic stem cell transplantation (AHSCT) can improve progression-free survival (PFS). Novel therapies are required for patients refractory to chemotherapy and AHSCT. The mammalian target of rapamycin inhibitor everolimus has shown preliminary activity in preclinical models of HL and promising efficacy in patients with relapsed or refractory HL...
2018: Experimental Hematology & Oncology
https://www.readbyqxmd.com/read/29769516/staying-safe-from-radiation-exposure-in-cath-lab-a-review
#9
K Pasha, H R Khan, A A Sumon
A successful cardiac catheterization Laboratory radiation safety program must manage patient and staff safety by reducing exposure to ionizing radiation to a level that is as low as reasonably achievable (ALARA). The first step in radiation safety is to avoid unnecessary use of ionizing radiation by justification of exposure, one of the basic principles of radiation protection. All individuals involved in fluoroscopic imaging procedures should familiarize themselves to the measures to protect themselves from exposure to unsafe doses of ionizing radiation...
April 2018: Mymensingh Medical Journal: MMJ
https://www.readbyqxmd.com/read/29769433/medical-imaging-dose-optimization-from-ground-up-expert-opinion-of-an-international-summit
#10
Ehsan Samei, Hannu Jarvinen, Mika Kortesniemi, Georgios Simantirakis, Charles Goh, Anthony Wallace, Eliseo Vano, Adrian Bejan, M M Rehani, J Vassileva
As in any medical intervention, there is either a known or an anticipated benefit to the patient from undergoing a medical imaging procedure. This benefit is generally significant as demonstrated by the manner in which medical imaging has transformed clinical medicine. At the same time, when it comes to imaging that deploys ionizing radiation, there is a potential associated risk from radiation. Radiation risk has been recognized as a key liability in the practice of medical imaging, creating a motivation for radiation dose optimization...
May 17, 2018: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/29766239/-90-y-resin-microspheres-radioembolization-for-colon-cancer-liver-metastases-using-full-strength-contrast-material
#11
I Kurilova, R G H Beets-Tan, G A Ulaner, F E Boas, E N Petre, H Yarmohammadi, E Ziv, A R Deipolyi, L A Brody, M Gonen, Constantinos T Sofocleous
OBJECTIVES: To assess safety and efficacy of 90 Y resin microspheres administration using undiluted non-ionic contrast material (UDCM) {100% Omnipaque-300 (Iohexol)} in both the "B" and "D" lines. MATERIALS AND METHODS: We reviewed all colorectal cancer liver metastases patients treated with 90 Y resin microspheres radioembolization (RAE) from 2009 to 2017. As of April 2013, two experienced operators started using UDCM (study group) instead of standard sandwich infusion (control group)...
May 15, 2018: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/29764183/a-pilot-study-with-palonosetron-in-the-prophylaxis-of-radiation-induced-nausea-and-vomiting
#12
Vithusha Ganesh, Leah Drost, Carlo DeAngelis, Bo Angela Wan, Mark Pasetka, Stephanie Chan, Liying Zhang, May Tsao, Elizabeth Barnes, Natalie Pulenzas, Hans Chung, Pearl Zaki, Caitlin Yee, Edward Chow
BACKGROUND: Palonosetron is an effective antiemetic in chemotherapy-induced nausea and vomiting (CINV), but has yet to be studied in the radiation setting. The purpose of the present study was to investigate the efficacy and safety of palonosetron in the prophylaxis of radiation-induced nausea and vomiting (RINV). METHODS: Patients without existing nausea and vomiting undergoing palliative radiotherapy to sites with emetic risk were prescribed palonosetron 0.5 mg orally before the start of radiation treatment, and every other day until completion of treatment...
April 2018: Annals of Palliative Medicine
https://www.readbyqxmd.com/read/29761989/-super-resolution-reconstruction-for-lung-four-dimensional-computed-tomography-images-using-multi-model-gaussian-process-regression
#13
Shiting Fang, Tao Zhong, Jin Chen, Yu Zhang
Lung four dimensional computed tomography (4D-CT) can lead to accurate radiotherapy. However, for the safety of patients, the scan spacing of 4D-CT cannot be too small so that the inter-slice resolution of lung 4D-CT is low, and thus the coronal and sagittal images need to be interpolated to obtain high-resolution images. This paper presents a super-resolution reconstruction technique based on multi-model Gaussian process regression. We use the high-resolution transversal images and the corresponding low-resolution images as the training sets...
December 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29760597/application-of-an-incident-taxonomy-for-radiation-therapy-analysis-of-five-years-of-data-from-three-integrated-cancer-centres
#14
Stuart Greenham, Stephen Manley, Kirsty Turnbull, Matthew Hoffmann, Amara Fonseca, Justin Westhuyzen, Andrew Last, Noel J Aherne, Thomas P Shakespeare
Aim: To develop and apply a clinical incident taxonomy for radiation therapy. Background: Capturing clinical incident information that focuses on near-miss events is critical for achieving higher levels of safety and reliability. Methods and materials: A clinical incident taxonomy for radiation therapy was established; coding categories were prescription, consent, simulation, voluming, dosimetry, treatment, bolus, shielding, imaging, quality assurance and coordination of care...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29759332/sunset-stereotactic-radiation-for-ultracentral-non-small-cell-lung-cancer-a-safety-and-efficacy-trial
#15
Meredith Giuliani, Ashwathy S Mathew, Houda Bahig, Scott V Bratman, Edith Filion, Daniel Glick, Alexander V Louie, Srinivas Raman, Anand Swaminath, Andrew Warner, Vivian Yau, David Palma
BACKGROUND: Lung stereotactic body radiotherapy (SBRT) is considered a standard curative treatment for medically inoperable early stage non-small-cell lung cancer (NSCLC). Patients with ultracentral tumors (signifying tumors whose planning target volume touches or overlaps the central bronchial tree, esophagus, or pulmonary artery) may be at higher risk of serious toxicities such as bronchial stricture and collapse, esophageal strictures, tracheal-esophageal fistula, and hemorrhage. The primary objective of the study is to determine the maximum tolerated dose of radiotherapy for ultracentral NSCLC...
April 18, 2018: Clinical Lung Cancer
https://www.readbyqxmd.com/read/29759255/rapid-separation-of-zirconium-using-microvolume-anion-exchange-cartridge-for-93-zr-determination-with-isotope-dilution-icp-ms
#16
Shiho Asai, Yukiko Hanzawa, Miki Konda, Daisuke Suzuki, Masaaki Magara, Takaumi Kimura, Ryo Ishihara, Kyoichi Saito, Shinsuke Yamada, Hideyuki Hirota
Estimating the risks associated with radiation from long-lived fission products (LLFP) in radioactive waste is essential to ensure the long-term safety of potential disposal sites. In this study, the amount of 93 Zr, a LLFP, was determined by ICP-MS after separating Zr from a spent nuclear fuel solution using a microvolume anion-exchange cartridge (TEDA cartridge). Zirconium in 9.4 M HCl was stably retained on the TEDA cartridge and readily eluted with 0.75 mL of a mixed solution of 9.4 M HCl and 0.01 M HF...
August 1, 2018: Talanta
https://www.readbyqxmd.com/read/29757719/providing-mr-imaging-for-cervical-cancer-brachytherapy-lessons-for-radiologists
#17
Thomas Sullivan, Joseph H Yacoub, Matthew M Harkenrider, William Small, Murat Surucu, Steven M Shea
Brachytherapy (BT), the use of a locally placed or implanted radioactive source for treatment of an adjacent tumor, is an important component in the treatment of patients with both early- and advanced-stage cervical cancer and is increasingly part of the standard treatment protocol. When it is feasible, many radiation oncologists choose to include a magnetic resonance (MR) imaging examination for planning BT treatment (ie, an MR imaging examination after placement of the applicator but before radiation dosing)...
May 2018: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/29755904/radiation-induced-cavernous-malformation-as-a-late-sequelae-of-stereotactic-radiosurgery-for-epilepsy
#18
Ethan A Winkler, Caleb Rutledge, Mariann Ward, Tarik Tihan, Patricia K Sneed, Nicholas Barbaro, Paul Garcia, Michael McDermott, Edward F Chang
Stereotactic radiosurgery (SRS) is a promising treatment for medically intractable mesial temporal lobe epilepsy. SRS for epilepsy has had an acceptable safety profile with reports of radiation-induced vascular malformations confined to central nervous system pathologies with prominent angiogenesis - namely, primary brain tumors, metastases, and arteriovenous malformations. Theoretical risks for radiation-induced lesions following radiosurgery for epilepsy have yet to be established. Of 13 patients treated in a pilot trial for medial temporal lobe epilepsy, one developed multiple delayed radiation-induced cavernous malformations following radiosurgery...
March 11, 2018: Curēus
https://www.readbyqxmd.com/read/29755770/safety-and-initial-efficacy-of-radiation-segmentectomy-for-the-treatment-of-hepatic-metastases%C3%A2
#19
Craig Meiers, Amy Taylor, Brian Geller, Beau Toskich
Background: Hepatic metastatectomy and ablation are associated with prolonged survival, but not all lesions are anatomically amenable to these therapies. We evaluated safety and initial efficacy of segmental ablative transarterial radioembolization, or radiation segmentectomy (RS), as a treatment for hepatic metastases. Methods: A single institution retrospective analysis was performed of patients with hepatic metastases, determined unamenable to resection by a multidisciplinary tumor board, treated with RS from 2015-2017...
April 2018: Journal of Gastrointestinal Oncology
https://www.readbyqxmd.com/read/29754851/treatment-of-hepatocellular-carcinoma-with-tumor-thrombus-with-the-use-of-iodine-125-seed-strand-implantation-and-transarterial-chemoembolization-a-propensity-score-analysis
#20
Zi-Han Zhang, Wen Zhang, Jun-Ying Gu, Qing-Xin Liu, Jing-Qin Ma, Ling-Xiao Liu, Jian-Hua Wang, Jian-Jun Luo, Zhi-Ping Yan
PURPOSE: To evaluate the safety and efficacy of iodine-125 (125 I) seed strand implantation in combination with transarterial chemoembolization for the treatment of hepatitis B-related unresectable hepatocellular carcinoma (HCC) with portal vein invasion. MATERIALS AND METHODS: From January 2013 to June 2016, 76 HCC patients with type II tumor thrombus were included in this single-center retrospective study. Twenty patients underwent 125 I seed strand implantation combined with transarterial chemoembolization (group A; n = 20), while 56 patients underwent transarterial chemoembolization alone (group B; n = 56)...
May 10, 2018: Journal of Vascular and Interventional Radiology: JVIR
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