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https://www.readbyqxmd.com/read/29454124/brainstem-dose-constraints-in-non-isometric-radiosurgical-treatment-planning-of-trigeminal-neuralgia-a-single-institution-experience
#1
Michael Zhang, Layton A Lamsam, Matthew K Schoen, Swapnil S Mehta, Geoffrey Appelboom, John K Adler, Scott G Soltys, Steven D Chang
INTRODUCTION: CyberKnife stereotactic radiosurgery (SRS) for trigeminal neuralgia (TGN) administers non-isometric, conformational high-dose radiation to the trigeminal nerve with risk of subsequent hypoesthesia. METHODS: We performed a retrospective, single-institution review of 66 TGN patients, treated by CyberKnife, to compare outcomes from two distinct treatment periods (standard dosing, N = 38 and reduced dosing, N = 28). Standard and reduced dosing permitted a maximum brainstem dose of 45 Gy and 25 Gy, respectively, each with a prescription dose of 60 Gy...
February 14, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29453893/cbct-guided-evolutive-library-for-cervical-adaptive-imrt
#2
Bastien Rigaud, Antoine Simon, Maxime Gobeli, Caroline Lafond, Julie Leseur, Anais Barateau, Nicolas Jaksic, Joël Castelli, Danièle Williaume, Pascal Haigron, Renaud De Crevoisier
PURPOSE: In the context of adaptive radiation therapy (ART) for locally advanced cervical carcinoma (LACC), this study proposed an original cone-beam computed tomography (CBCT)-guided "Evolutive library" and evaluated it against four other known radiotherapy (RT) strategies. MATERIAL AND METHODS: For 20 patients who underwent intensity-modulated radiation therapy (IMRT) for LACC, three planning CTs (with empty [EB], intermediate [IB], and full [FB] bladder volumes), a CT scan at 20 Gy and bi-weekly CBCTs for 5 weeks were performed...
February 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29453681/-18-f-fpybf-2-a-new-f-18-labelled-amyloid-imaging-pet-tracer-biodistribution-and-radiation-dosimetry-assessment-of-first-in-man-18-f-fpybf-2-pet-imaging
#3
Ryuichi Nishii, Tatsuya Higashi, Shinya Kagawa, Chio Okuyama, Yoshihiko Kishibe, Masaaki Takahashi, Tomoko Okina, Norio Suzuki, Hiroshi Hasegawa, Yasuhiro Nagahama, Koichi Ishizu, Naoya Oishi, Hiroyuki Kimura, Hiroyuki Watanabe, Masahiro Ono, Hideo Saji, Hiroshi Yamauchi
OBJECTIVE: Recently, a benzofuran derivative for the imaging of β-amyloid plaques, 5-(5-(2-(2-(2- 18 F-fluoroethoxy)ethoxy)ethoxy)benzofuran-2-yl)- N-methylpyridin-2-amine ( 18 F-FPYBF-2) has been validated as a tracer for amyloid imaging and it was found that 18 F-FPYBF-2 PET/CT is a useful and reliable diagnostic tool for the evaluation of AD (Higashi et al. Ann Nucl Med, https://doi.org/10.1007/s12149-018-1236-1 , 2018). The aim of this study was to assess the biodistribution and radiation dosimetry of diagnostic dosages of 18 F-FPYBF-2 in normal healthy volunteers as a first-in-man study...
February 16, 2018: Annals of Nuclear Medicine
https://www.readbyqxmd.com/read/29453592/patient-specific-registration-of-3d-ct-angiography-cta-with-x-ray-fluoroscopy-for-image-fusion-during-transcatheter-aortic-valve-implantation-tavi-increases-performance-of-the-procedure
#4
I Vernikouskaya, W Rottbauer, J Seeger, B Gonska, V Rasche, Jochen Wöhrle
OBJECTIVES: The aim of this study was to adapt patient-specifically a co-registration procedure for image fusion (IF) of a pre-interventional CT dataset with real-time X-ray (XR) fluoroscopy during transfemoral transcatheter aortic valve implantation (TAVI), enabling improved performance of the procedure. BACKGROUND: The ability to use 3D models of the respective anatomies to complement the anatomic information obtained by XR fluoroscopy and provide a greater degree of real-time anatomical guidance holds great potential for complex cardiac interventions, especially for TAVI procedures with cerebral protection...
February 16, 2018: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/29453555/evaluation-of-the-effect-of-hyperthermia-and-electron-radiation-on-prostate-cancer-stem-cells
#5
Zhila Rajaee, Samideh Khoei, Seied Rabi Mahdavi, Marzieh Ebrahimi, Sakine Shirvalilou, Alireza Mahdavian
The aim of this study was to investigate the effect of hyperthermia, 6 MeV electron radiation and combination of these treatments on cancer cell line DU145 in both monolayer culture and spheroids enriched for prostate cancer stem cells (CSCs). Flowcytometric analysis of the expression of molecular markers CD133 + /CD44 + was carried out to determine the prostate CSCs in cell line DU145 grown as spheroids in serum-free medium. Following monolayer and spheroid culture, DU145 cells were treated with different doses of hyperthermia, electron beam and combination of them...
February 17, 2018: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/29453554/in-vitro-studies-of-dna-damage-and-repair-mechanisms-induced-by-bnct-in-a-poorly-differentiated-thyroid-carcinoma-cell-line
#6
C Rodriguez, M Carpano, P Curotto, S Thorp, M Casal, G Juvenal, M Pisarev, M A Dagrosa
Boron neutron capture therapy (BNCT) for aggressive tumors is based on nuclear reaction [ 10 B (n, α) 7 Li]. Previously, we demonstrated that BNCT could be applied for the treatment of undifferentiated thyroid carcinoma. The aim of the present study was to describe the DNA damage pattern and the repair pathways that are activated by BNCT in thyroid cells. We analyzed γH2AX foci and the expression of Ku70, Rad51 and Rad54, main effector enzymes of non-homologous end joining (NHEJ) and homologous recombination repair (HRR) pathways, respectively, in thyroid follicular carcinoma cells...
February 16, 2018: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/29453161/gamma-irradiation-during-gametogenesis-in-young-adult-zebrafish-causes-persistent-genotoxicity-and-adverse-reproductive-effects
#7
Selma Hurem, Tânia Gomes, Dag A Brede, Ian Mayer, Viola H Lobert, Stephen Mutoloki, Kristine B Gutzkow, Hans-Christian Teien, Deborah Oughton, Peter Aleström, Jan L Lyche
The biological effects of gamma radiation may exert damage beyond that of the individual through its deleterious effects on reproductive function. Impaired reproductive performance can result in reduced population size over consecutive generations. In a continued effort to investigate reproductive and heritable effects of ionizing radiation, we recently demonstrated adverse effects and genomic instability in progeny of parents exposed to gamma radiation. In the present study, genotoxicity and effects on the reproduction following subchronic exposure during a gametogenesis cycle to 60 Co gamma radiation (27 days, 8...
February 13, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29452949/estimation-of-the-effectiveness-ratio-%C3%AE-%C3%AE-for-resistant-cancer-cells-in-u87mg-human-glioblastoma
#8
Perla Marmolejo-León, Erika Patricia Azorín-Vega, Nallely Jiménez-Mancilla, Héctor Javier Mendoza-Nava, Eleni Mitsoura, Benjamín Pineda, Eugenio Torres-García
Glioblastoma contains self-renewing, tumorigenic cancer stem-like cells that contribute to tumor initiation and therapeutic resistance. The aim of this research was to estimate and compare the effectiveness ratio (α/β) of stem-like cells and differentiated glioma cells derived from the U87MG glioblastoma cell line. Cell survival experiments were obtained in a dose range of 0-20 Gy (13.52 ± 0.09 Gy/h) as a hyperfractionationated accelerated radiotherapy scheme. Biochemical characterization of the post-irradiated cells was performed by flow cytometry analysis and the percentage of stem-like cells that resisted irradiation was determined by the CD133 expression...
January 11, 2018: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/29452902/retina-dose-as-a-predictor-for-visual-acuity-loss-in-106-ru-eye-plaque-brachytherapy-of-uveal-melanomas
#9
Gerd Heilemann, Lukas Fetty, Matthias Blaickner, Nicole Nesvacil, Martin Zehetmayer, Dietmar Georg, Roman Dunavoelgyi
BACKGROUND AND PURPOSE: To evaluate the retina dose as a risk factor associated with loss of visual acuity (VA) in 106 Ru plaque brachytherapy. MATERIAL/METHODS: 45 patients receiving 106 Ru plaques brachytherapy (median follow-up 29.5 months) were included in this study. An in-house developed treatment planning system with Monte Carlo based dose calculation was used to perform treatment planning and dose calculation. Risk factors associated with loss of VA were evaluated using the Cox proportional hazards models, Kaplan-Meier estimates and Pearson correlation coefficients...
February 13, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29452901/improved-cost-effectiveness-of-short-course-radiotherapy-in-elderly-and-or-frail-patients-with-glioblastoma
#10
Sunita Ghosh, Sarah Baker, Douglas Guedes de Castro, Lucyna Kepka, Narendra Kumar, Valery Sinaika, Juliana Matiello, Darejan Lomidze, Katarzyna Dyttus-Cebulok, Eduardo Rosenblatt, Elena Fidarova, Wilson Roa
BACKGROUND AND PURPOSE: Short-course radiotherapy (25 Gy in five fractions) was recently shown in a randomized phase III trial to be non-inferior to 40 Gy in 15 fractions in elderly and/or frail patients with glioblastoma multiforme. This study compared the cost-effectiveness of the two regimens. MATERIAL AND METHODS: The direct unit costs of imaging, radiotherapy (RT), and dexamethasone were collected from the five primary contributing countries to the trial, constituting the data of 88% of all patients...
February 13, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29452875/use-of-expanders-for-bowel-protection-in-pediatric-pelvic-tumor-radiation-therapy-15-years-of-tolerance-results
#11
Fernand Missohou
PURPOSE: Bowel is often the dose-limiting organ in curative pelvic irradiation because of radiation enteritis when dose exceeds 40 to 45 Gy. To limit radiation enteritis, a silicone tissue-expander prothesis (STEP) connected to a subcutaneous self-sealing valve was prospectively used in children undergoing pelvic or abdominal radiation therapy. This study reports the 15-year long-term outcomes of this prospective series. METHODS AND MATERIALS: Between 1987 and 2008, 29 children from 3 Paris institutions received pelvic radiation therapy after surgical placement of a STEP in the pelvis...
December 14, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29452868/chest-wall-dose-reduction-using-noncoplanar-volumetric-modulated-arc-radiation-therapy-for-lung-stereotactic-ablative-radiation-therapy
#12
Amy S Yu, Peter G Maxim, Billy W Loo, Michael F Gensheimer
PURPOSE: Stereotactic ablative radiation therapy (SABR) to lung tumors close to the chest wall can cause rib fractures or chest wall pain. We evaluated and propose a clinically practical solution of using noncoplanar volumetric modulated arc radiation therapy (VMAT) to reduce chest wall dose from lung SABR. METHODS AND MATERIALS: Twenty lung SABR VMAT plans in which the chest wall volume receiving 30 Gy or higher (V30) exceeded 30 mL were replanned by noncoplanar VMAT with opposite 15° couch kicks...
December 19, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29452863/chest-wall-toxicity-after-hypofractionated-proton-beam-therapy-for-liver-malignancies
#13
Rosanna Yeung, Stephen R Bowen, Tobias R Chapman, Grayden T MacLennan, Smith Apisarnthanarax
PURPOSE: Normal liver-sparing with proton beam therapy (PBT) allows for dose escalation in the treatment of liver malignancies, but it may result in high doses to the chest wall (CW). CW toxicity (CWT) data after PBT for liver malignancies are limited, with most published reports describing toxicity after a combination of hypofractionated proton and photon radiation therapy. We examined the incidence and associated factors for CWT after hypofractionated PBT for liver malignancies. METHODS AND MATERIALS: We retrospectively reviewed the charts of 37 consecutive patients with liver malignancies (30 hepatocellular carcinoma, 6 intrahepatic cholangiocarcinoma, and 1 metastasis) treated with hypofractionated PBT...
December 24, 2017: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29452770/single-arm-phase-2-trial-of-elective-nodal-dose-reduction-for-patients-with-locoregionally-advanced-squamous-cell-carcinoma-of-the-head-and-neck
#14
Patrick D Maguire, Charles R Neal, Stuart M Hardy, Andrew M Schreiber
PURPOSE: To evaluate a novel chemoradiation therapy (CRT) regimen for patients with squamous cell carcinoma of the head and neck (SCCHN) incorporating a lower intensity modulated radiation therapy dose to electively treated neck lymph nodes than is currently standard. METHODS AND MATERIALS: Eligible patients had locally advanced SCCHN of the oral cavity, oropharynx, larynx, or hypopharynx. The 7-week CRT course consisted of weekly cisplatin at 35 mg/m 2 concurrently with sequential-boost intensity modulated radiation therapy: 36 Gy to high- and low-risk planning target volumes followed by a sequential boost to the high-risk planning target volume to 70 Gy...
December 28, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29452716/dental-pulp-status-of-posterior-teeth-in-patients-with-oral-and-oropharyngeal-cancer-treated-with-radiotherapy-1-year-follow-up
#15
Nishtha Gupta, Mandeep S Grewal, Munish Gairola, Stutee Grewal, Parveen Ahlawat
INTRODUCTION: Teeth may react negatively to pulp sensitivity testing in patients who have undergone radiotherapy. The aim of the current investigation was to evaluate the pulp sensibility of posterior teeth at 4, 6, and 12 months in patients who have undergone radiotherapy for oral and oropharyngeal malignancies. METHODS: Seventy-nine patients diagnosed with malignant oral and oropharyngeal cancer undergoing radiotherapy underwent cold thermal pulp sensitivity testing and electric pulp testing of 4 teeth, 1 from each quadrant...
February 13, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29452167/microrna-136-inhibits-proliferation-and-promotes-apoptosis-and-radiosensitivity-of-cervical-carcinoma-through-the-nf-%C3%AE%C2%BAb-pathway-by-targeting-e2f1
#16
Hong-Jie Lu, Pei-Ying Jin, Yao Tang, Shao-Hua Fan, Zi-Feng Zhang, Fang Wang, Dong-Mei Wu, Jun Lu, Yuan-Lin Zheng
AIMS: Several microRNAs (miRs) are expressed aberrantly and associated with progression, tumorigenesis, and prognosis of haematological and solid tumors. The study aimed to identify the effects involved with microRNA-136 (miR-136) on the concurrent enhancement of proliferation, apoptosis and radiosensitivity of cervical carcinoma through the NF-κB signaling pathway by targeting E2F1. MAIN METHODS: Totally 338 patients with cervical carcinoma were recruited in this study...
February 13, 2018: Life Sciences
https://www.readbyqxmd.com/read/29450961/volumetric-based-image-guidance-is-superior-to-marker-based-alignments-for-stereotactic-body-radiotherapy-of-prostate-cancer
#17
Wen Li, Lan Lu, Kevin L Stephans, Naveen Sharma, Andrew Vassil, Zhilei Liu Shen, Abigail Stockham, Toufik Djemil, Rahul D Tendulkar, Ping Xia
PURPOSES: The aim of this study was to evaluate a dual marker-based and soft-tissue based image guidance for inter-fractional corrections in stereotactic body radiotherapy (SBRT) of prostate cancer. METHODS/MATERIALS: We reviewed 18 patients treated with SBRT for prostate cancer. An endorectal balloon was inserted at simulation and each treatment. Planning margins were 3 mm/0 mm posteriorly. Prior to each treatment, a dual image guidance protocol was applied to align three makers using stereoscopic x ray images and then to the soft tissue using kilo-voltage cone beam CT (kV-CBCT)...
February 15, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29450591/occurrence-of-pneumonitis-following-radiotherapy-of-breast-cancer-a-prospective-study
#18
Danijela Vasiljevic, Christoph Arnold, David Neuman, Katharina Fink, Marina Popovscaia, Irma Kvitsaridze, Meinhard Nevinny-Stickel, Markus Glatzer, Peter Lukas, Thomas Seppi
AIM: of this study is to determine the temporal resolution of therapy-induced pneumonitis, and to assess promoting factors in adjuvant treated patients with unilateral mammacarcinoma. PATIENTS AND METHODS: A total of 100 post-surgery patients were recruited. The cohort was treated by 2 field radiotherapy (2FRT; breast and chest wall, N = 75), 3 field radiotherapy (3FRT; + supraclavicular lymphatic region, N = 8), or with 4 field radiotherapy (4FRT; + parasternal lymphatic region, N = 17)...
February 15, 2018: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/29450589/effect-of-continuous-positive-airway-pressure-administration-during-lung-stereotactic-ablative-radiotherapy-a-comparative-planning-study
#19
Dario Di Perri, Andréa Colot, Antoine Delor, Randa Ghoul, Guillaume Janssens, Valérie Lacroix, Pascal Matte, Annie Robert, Kevin Souris, Xavier Geets
PURPOSE: By increasing lung volume and decreasing respiration-induced tumour motion amplitude, administration of continuous positive airway pressure (CPAP) during stereotactic ablative radiotherapy (SABR) could allow for better sparing of the lungs and heart. In this study, we evaluated the effect of CPAP on lung volume, tumour motion amplitude and baseline shift, as well as the dosimetric impact of the strategy. METHODS: Twenty patients with lung tumours referred for SABR underwent 4D-computed tomography (CT) scans with and without CPAP (CPAP/noCPAP) at two timepoints (T0/T1)...
February 15, 2018: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/29450588/response-rates-and-recurrence-patterns-after-low-dose-radiotherapy-with-4-gy-in-patients-with-low-grade-lymphomas
#20
Laila König, Juliane Hörner-Rieber, Denise Bernhardt, Adriane Hommertgen, Stefan Rieken, Jürgen Debus, Klaus Herfarth
PURPOSE: Retrospective study of effectiveness, toxicity, and relapse patterns after low-dose radiotherapy (LDRT) in patients with low-grade lymphomas. METHODS: 47 patients (median age 64 years) with 50 lesions were treated with LDRT (2 × 2 Gy). In 60%, LDRT was the primary and curative treatment, in 40% offered as second-line therapy in recurrent disease. Histology included follicular (57%) and marginal zone lymphomas (43%). Patients were followed-up regularly clinically (skin) and with CT or MRI scans...
February 15, 2018: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
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