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https://www.readbyqxmd.com/read/28749618/radiation-induced-second-cancer-risk-from-external-beam-photon-radiotherapy-for-head-and-neck-cancer-impact-on-in-field-and-out-of-field-organs
#1
Vasanthan Sakthivel, Ganesh Kadirampatti Mani, Sunil Mani, Raghavendiran Boopathy
The purpose of this paper is to provide data on development of second primary cancers within or adjacent to tissue irradiated in the treatment of primary head and neck cancers using different techniques and modalities. Materials and methods: We selected five patients with HandN tumors located in base of the tongue for risk assessment. In order to examine the impact of choices of various planning techniques, numbers of beams and beam energy used in treatment plans - 7 and 9 field Intensity modulated radiotherapy (IMRT) plans using 6MV and 10 MV beam energies and a 6MV Volumetric modulated arc therapy (VMAT) plans were planned...
July 27, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28749375/towards-fast-online-intrafraction-replanning-for-free-breathing-stereotactic-body-radiation-therapy-with-the-mr-linac
#2
Charis Kontaxis, Gijsbert H Bol, Bjorn Stemkens, Markus Glitzner, Fieke M Prins, Linda G W Kerkmeijer, Jan J W Lagendijk, Bas W Raaymakers
The hybrid MRI-radiotherapy machines, like the MR-linac (Elekta AB, Stockholm, Sweden) installed at the UMC Utrecht (Utrecht, The Netherlands), will be able to provide real-time patient imaging during treatment. In order to take advantage of the system's capabilities and enable online adaptive treatments, a new generation of software should be developed, ranging from motion estimation to treatment plan adaptation. In this work we present a proof of principle adaptive pipeline designed for high precision Stereotactic Body Radiation Therapy (SBRT) suitable for sites affected by respiratory motion, like Renal Cell Carcinoma (RCC)...
July 27, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28749244/radiation-protection-and-mitigation-potential-of-phenylbutyrate-delivered-via-oral-administration
#3
Alexandra C Miller, Rafael Rivas, Robert McMahon, Karvelisse Miller, Leonard Tesoro, Vilmar Villa, Daminik Yanushkevich, Paul Lison
PURPOSE: Phenylbutyrate (PB), a histone deacetylase inhibitor (HDACi) has demonstrated radiation protection in both in vitro and in vivo models. Studies previously demonstrated that PB and other HDAC inhibitors could inhibit radiation lethality in vivo by subcutaneous (s.c) injection. The objective of this study was to test the ability of oral PB treatment to protect against or to mitigate acute gamma radiation-induced lethality in vivo. MATERIALS AND METHODS: Human osteoblasts cells were used to evaluate radiation survival when PB was delivered pre- or post-radiation...
July 27, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28749194/results-of-preoperative-chemoradiotherapy-for-patients-with-advanced-cancer-of-the-nasal-cavity-and-paranasal-sinuses
#4
Erik Fernström, Jan Nyman, Eva Hammerlid, Erik Holmberg, Hedda Haugen-Cange, Karin Petruson, Edvard Abel, Thomas Björk-Eriksson
OBJECTIVES: Curative treatment of nasal cavity and paranasal sinus cancer is challenging due to the proximity to critical anatomical structures. The purpose of this study was to analyze the impact of trimodality therapy with preoperative chemotherapy and reduced-dose radiotherapy followed by organ-preserving surgery for treating patients with nasal cavity and paranasal sinus cancer. METHODS: This retrospective study included all 156 patients diagnosed with sinonasal cancer in western Sweden between 1986 and 2009...
July 27, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28749176/quantifying-potential-reduction-in-contrast-dose-with-monoenergetic-images-synthesized-from-duallayer-detector-spectral-ct
#5
Derek S Tsang, Thomas E Merchant, Sophie E Merchant, Hanna Smith, Yoad Yagil, Chia-Ho Hua
OBJECTIVES: To estimate the potential dose reduction in iodinated contrast when interpreting monoenergetic images from spectral CT. METHODS: 51 pediatric patients received contrast-enhanced CT simulation for radiation therapy using a single-source, dual-layer detector spectral CT. The contrast-to-noise ratios (CNR) of blood vessels were measured relative to surrounding soft tissue. CNRs on monoenergetic 40-70 keV images were compared with polychromatic 120 kVp images...
July 27, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28749165/impact-of-robotic-ultrasound-image-guidance-on-plan-quality-in-sbrt-of-the-prostate
#6
Stefan Gerlach, Ivo Kuhlemann, Floris Ernst, Christoph Fürweger, Alexander Schlaefer
OBJECTIVES: Ultrasound provides good image quality, fast volumetric imaging, and is established for abdominal image guidance. Robotic transducer placement may facilitate intra-fractional motion compensation in radiation therapy. We consider integration with the CyberKnife and study whether the kinematic redundancy of a seven-degrees-of-freedom robot allows for acceptable plan quality for prostate treatments. METHODS: Reference treatment plans were generated for ten prostate cancer cases previously treated with the CyberKnife...
July 27, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28748829/dose-assessment-following-an-overexposure-of-a-worker-at-a-swiss-nuclear-power-plant
#7
Claude J Bailat, Jean-Pascal Laedermann, Sebastien Baechler, Laurent Desorgher, Abbas Aroua, Francois O Bochud
AIM: The aim of this work was to assess the doses received by a diver exposed to a radiation source during maintenance work in the fuel transfer pool at a Swiss nuclear power plant, and to define whether the statutory limit was breached or not. METHOD: Onsite measurements were carried out and different scenarios were simulated using the MicroShield Software and the MCNPX Monte Carlo (MC) radiation transport code to estimate the activity of the irradiating object as well as the doses to the limbs and the effective dose delivered to the operator...
July 27, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/28747973/effect-of-ionizing-radiation-at-low-dose-on-transgenerational-carcinogenesis-by-epigenetic-regulation
#8
Lan Li, Jong-Hyun Kim, Hee-Tae Park, Jae-Hoon Lee, Min-Koo Park, Ji-Won Lee, Jeong-Chan Lee, Min-Jae Lee
The objective of this study was to determine the effect of ionizing radiation (IR) exposure of parents on carcinogenesis of the next generation focusing on the epigenetic perspective to clarify the relationship between radiation dose and carcinogenesis in F1 generation SD rats. F1 generations from pregnant rats (F0) who were exposed to gamma rays were divided into three groups according to the dose of radiation: 10 rad, 30 rad, and untreated. They were intraperitoneally injected with 50 mg/kg of diethylnitrosamine (DEN)...
June 2017: Laboratory Animal Research
https://www.readbyqxmd.com/read/28747557/%C3%AE-h2ax-53bp1-and-rad51-protein-foci-changes-in-mesenchymal-stem-cells-during-prolonged-x-ray-irradiation
#9
Anastasia Tsvetkova, Ivan V Ozerov, Margarita Pustovalova, Anna Grekhova, Petr Eremin, Natalia Vorobyeva, Ilya Eremin, Andrey Pulin, Vadim Zorin, Pavel Kopnin, Sergey Leonov, Alex Zhavoronkov, Dmitry Klokov, Andreyan N Osipov
At high exposure levels ionizing radiation is a carcinogen. Little is known about how human stem cells, which are known to contribute to tumorigenesis, respond to prolonged radiation exposures. We studied formation of DNA double strand breaks, accessed as γH2AX and 53BP1 foci, in human mesenchymal stem cells (MSCs) exposed to either acute (5400 mGy/h) or prolonged (270 mGy/h) X-irradiation. We show a linear γH2AX and 53BP1 dose response for acute exposures. In contrast, prolonged exposure resulted in a dose-response curve that had an initial linear portion followed by a plateau...
July 12, 2017: Oncotarget
https://www.readbyqxmd.com/read/28746702/identifying-an-optimal-adjuvant-radiotherapy-dose-for-extremity-and-trunk-merkel-cell-carcinoma-following-resection-an-analysis-of-the-national-cancer-database
#10
Sagar A Patel, Muhammad M Qureshi, Debjani Sahni, Minh Tam Truong
Importance: Merkel cell carcinoma (MCC) is a rare and aggressive cutaneous neuroendocrine neoplasm with a high risk of recurrence following resection. Despite a rising incidence over the past 3 decades, there is a paucity of prospective data owing to the rarity of this disease. Objective: To determine the optimal adjuvant radiation therapy (RT) dose following resection of localized MCC of the extremities or trunk. Design, Setting, and Participants: Using the National Cancer Database, a large national database consisting of a heterogeneous population and treatment settings, we retrospectively analyzed a cohort of 2093 patients 18 years or older with stage I to III MCC of the extremities and/or trunk treated with definitive surgery and adjuvant RT between 1998 and 2011...
July 26, 2017: JAMA Dermatology
https://www.readbyqxmd.com/read/28746371/ionizing-radiation-response-of-primary-normal-human-lens-epithelial-cells
#11
Nobuyuki Hamada
Whilst the cataractogenic potential of ionizing radiation has been known for over the past 120 years, little is known about radiation responses of lens cells. Our previous work was the first to evaluate the radiosensitivity of lens cells with the clonogenic assay, documenting that the survival of HLEC1 human lens epithelial cells is comparable to that of WI-38 human lung fibroblasts. Moreover, HLEC1 cells were found to contain subsets where irradiation stimulates proliferation or facilitates formation of abortive colonies with fewer cells than human fibroblasts...
2017: PloS One
https://www.readbyqxmd.com/read/28746198/radiation-reduction-during-percutaneous-coronary-intervention-a-new-protocol-with-a-low-frame-rate-and-selective-fluoroscopic-image-storage
#12
Min Ku Chon, Kook Jin Chun, Dae Sung Lee, Soo Yong Lee, Jongmin Hwang, Sang Hyun Lee, Ki Won Hwang, Jeong Su Kim, Young Huyn Park, June Hong Kim
The percutaneous coronary intervention (PCI) procedure is associated with potentially high levels of radiation exposure and therefore increased risk of adverse radiation-induced outcomes, ranging from cataract to malignancy. Frame rate reduction and selective fluoroscopy storage may help reduce radiation exposure. In this study, we evaluated the efficacy of a radiation reduction protocol that uses a lower frame rate and selective storage of fluoroscopic images in terms of its effect on reducing the radiation dose during PCI...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28746180/a-consort-compliant-prospective-randomized-controlled-trial-radiation-dose-reducing-in-computed-tomography-using-an-additional-lateral-scout-view-combined-with-automatic-tube-current-modulation-phantom-and-patient-study
#13
Wanlin Peng, Zhenlin Li, Chunchao Xia, Yingkun Guo, Jinge Zhang, Kai Zhang, Lei Li, Fei Zhao
BACKGROUND: Radiation exposure has been a hot point in research field of computed tomography (CT). Recently, automated tube current modulation (ATCM) has emerged as an important technique to reduce radiation exposure. Many studies have shown that the difference in scout view would affect modulation. This prospective randomized controlled study is aimed to investigate the impact of an additional lateral scout view on radiation dose and image quality in CT using ACTM. METHODS: Combined with ATCM (Care Dose 4D) on multidetector CT, 2 thoracic phantom CT image series were acquired in which planning was conducted with either an anteroposterior (AP) or an AP-lateral scout view...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28745431/trabectedin-is-a-promising-antitumor-agent-potentially-inducing-melanocytic-differentiation-for-clear-cell-sarcoma
#14
Takaaki Nakai, Yoshinori Imura, Hironari Tamiya, Shutaro Yamada, Sho Nakai, Naohiro Yasuda, Keiko Kaneko, Hidetatsu Outani, Satoshi Takenaka, Kenichiro Hamada, Akira Myoui, Nobuhito Araki, Takafumi Ueda, Kazuyuki Itoh, Hideki Yoshikawa, Norifumi Naka
Clear cell sarcoma is an aggressive soft tissue sarcoma and highly resistant to conventional chemotherapy and radiation therapy. This devastating disease is defined by EWSR1-ATF1 fusion gene resulting from chromosomal translocation t(12;22)(q13;q12) and characterized by melanocytic differentiation. A marine-derived antineoplastic agent, trabectedin, inhibits the growth of myxoid liposarcoma and Ewing sarcoma by causing adipogenic differentiation and neural differentiation, respectively. In this study, we examined the antitumor effects and mechanism of action of trabectedin on human clear cell sarcoma cell lines...
July 26, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28743528/contrast-enhanced-ultrasound-as-a-radiation-free-alternative-to-fluoroscopic-nephrostogram-for-evaluating-ureteral-patency
#15
Thomas Chi, Manint Usawachintachit, Stefanie Weinstein, Maureen P Kohi, Andrew Taylor, David T Tzou, Helena C Chang, Marshall Stoller, John Mongan
PURPOSE: To compare contrast-enhanced ultrasound and fluoroscopic nephrostography in the evaluation of ureteral patency following percutaneous nephrolithotomy. MATERIALS AND METHODS: This was a prospective cohort non-inferiority study conducted after obtaining institutional review board approval. We enrolled eligible patients with kidney and proximal ureteral stones who underwent percutaneous nephrolithotomy at our center. On postoperative day 1, patients received both contrast-enhanced ultrasounds and fluoroscopic nephrostograms within 2 hours of each other to evaluate ureteral patency, the primary outcome for this study...
July 22, 2017: Journal of Urology
https://www.readbyqxmd.com/read/28743240/whole-brain-radiotherapy-versus-stereotactic-radiosurgery-for-4-10-brain-metastases-a-phase-iii-randomised-multicentre-trial
#16
Jaap D Zindler, Anna M E Bruynzeel, Daniëlle B P Eekers, Coen W Hurkmans, Ans Swinnen, Philippe Lambin
BACKGROUND: Maintenance of quality of life is the primary goal during treatment of brain metastases (BM). This is a protocol of an ongoing phase III randomised multicentre study. This study aims to determine the exact additional palliative value of stereotactic radiosurgery (SRS) over whole brain radiotherapy (WBRT) in patients with 4-10 BM. METHODS: The study will include patients with 4-10 BM from solid primary tumours diagnosed on a high-resolution contrast-enhanced MRI scan with a maximum lesional diameter of 2...
July 25, 2017: BMC Cancer
https://www.readbyqxmd.com/read/28742703/organ-preservation-in-ct2n0-rectal-cancer-after-neoadjuvant-chemoradiation-therapy-the-impact-of-radiation-therapy-dose-escalation-and-consolidation-chemotherapy
#17
Angelita Habr-Gama, Guilherme Pagin São Julião, Bruna Borba Vailati, Jorge Sabbaga, Patricia Bailão Aguilar, Laura Melina Fernandez, Sergio Eduardo Alonso Araújo, Rodrigo Oliva Perez
OBJECTIVE: To demonstrate the difference in organ-preservation rates and avoidance of definitive surgery among cT2N0 rectal cancer patients undergoing 2 different chemoradiation (CRT) regimens. BACKGROUND: Patients with cT2N0 rectal cancer are more likely to develop complete response to neoadjuvant CRT. Organ preservation has been considered an alternative treatment strategy for selected patients. Radiation dose-escalation and consolidation chemotherapy have been associated with increased rates of response and may improve chances of organ preservation among these patients...
July 24, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/28742468/single-ct-scan-prolongs-survival-by-extending-cancer-latency-in-trp53-heterozygous-mice
#18
Jennifer A Lemon, Nghi Phan, Douglas R Boreham
There is growing concern over the effects of medical diagnostic procedures on cancer risk. Although numerous studies have demonstrated that low doses of ionizing radiation can have protective effects including reduced cancer risk and increasing lifespan, the hypothesis that any radiation exposure increases cancer risk still predominates. In this study, we investigated cancer development and longevity of cancer-prone Trp53(+/-) mice exposed at 7-8 weeks of age to a single 10 mGy dose from either a diagnostic CT scan or gamma radiation...
July 25, 2017: Radiation Research
https://www.readbyqxmd.com/read/28742421/comparison-of-30-mci-and-50-mci-i-131-doses-for-ablation-of-thyroid-remnant-in-papillary-thyroid-cancer-patients
#19
Xiao Yue Cai, Niranjan Vijayaratnam, Alexander J B McEwan, Rebecca Reif, Donald W Morrish
PURPOSE OF THE STUDY: To compare efficacy of thyroid remnant ablation using 30 mCi or 50 mCi 131-I in papillary thyroid cancer patients. MATERIALS AND METHODS: Five hundred and fifteen consecutive patients with Tumor-Node-Metastasis (TNM) stages T1-T3 N1/N0/NX receiving either 30 mCi or 50 mCi I-131 were analyzed for the effectiveness of remnant ablation using rhTSH-stimulated serum thyroglobulin. One hundred and five consecutive patients receiving 100 mCi I-131 were analyzed for the incidence of radiation thyroiditis and sialadenitis...
July 25, 2017: Endocrine Research
https://www.readbyqxmd.com/read/28742383/role-of-mri-in-the-use-of-an-absorbable-hydrogel-spacer-in-men-undergoing-radiation-therapy-for-prostate-cancer-what-the-radiologist-needs-to-know
#20
Alison D Sheridan, Sameer K Nath, Steffen Huber, Sarah Rosasco, Jeffrey C Weinreb, Gary M Israel
OBJECTIVE: Hydrogel spacers have a novel role in the treatment of low- and intermediate-risk prostate cancer with dose-escalated radiation therapy. Given the growing number of patients undergoing treatment with radiation therapy, the use of hydrogel spacers is expected to increase. The purpose of this article is to review what a radiologist needs to know about the imaging of hydrogel spacers, including MRI technique and appearance on CT and MRI. CONCLUSION: MRI has a critical role in the evaluation of hydrogel spacer placement and is used to facilitate contouring by the radiation oncologist...
July 25, 2017: AJR. American Journal of Roentgenology
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