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Stereotactic radiation

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https://www.readbyqxmd.com/read/28086825/toxicity-and-quality-of-life-report-of-a-phase-ii-study-of-stereotactic-body-radiotherapy-sbrt-for-low-and-intermediate-risk-prostate-cancer
#1
Matthew J Boyer, Michael A Papagikos, Rex Kiteley, Zeljko Vujaskovic, Jackie Wu, W Robert Lee
BACKGROUND: Clinical data indicates that delivery of larger daily doses of radiation may improve the therapeutic ratio for prostate cancer compared to conventional fractionation. A phase II study of stereotactic body radiotherapy with real-time motion management and daily plan re-optimization for low to intermediate risk prostate cancer was undertaken to evaluate this hypothesis. This report details the toxicity and quality of life following treatment. METHODS: From 2009 to 2013, 60 patients with T1-T2c prostate cancer with a Gleason score of 6 and PSA ≤ 15 or Gleason score of 7 and PSA ≤ 10 were enrolled...
January 13, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28081463/analysis-of-the-results-of-recurrent-intracranial-meningiomas-treated-with-re-radiosurgery
#2
Moinay Kim, Do Hee Lee, Hyun Jung Kim Rn, Young Hyun Cho, Jeong Hoon Kim, Do Hoon Kwon
OBJECTS: Meningioma is the most common intracranial neoplasm, comprising approximately 30% of all primary intracranial tumors (Claus et al., 2005) [1]. Treatment options include observation, microsurgical resection, stereotactic radiosurgery (SRS), and whole brain radiation therapy (WBRT). Gamma knife radiosurgery (GKRS) is a very effective treatment for intracranial meningiomas; previous studies showed the tumor control rate at 5-10 years of follow-up as 84.3%-100% in all cases (Feigl et al...
December 29, 2016: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28078405/-radiosurgery-and-fractionated-stereotactic-radiotherapy-of-vestibular-schwannoma
#3
K Hamm, H-U Herold, G Surber, S Rosahl
Management of vestibular schwannoma (VS) should always be interdisciplinary and results better than the natural course. Particularly in small VS, either microsurgical resection or radiosurgery (RS) can be employed. RS is a special method (initially only possible stereotactically) for delivering high-precision radiation from many directions to the target point (the isocenter) in a single high dose. With the development of three different systems-Gamma Knife (Elekta, Stockholm, Sweden), special linear accelerators, and CyberKnife (Accuray, Sunnyvale, CA, USA)-the options were extended to 1-5 fractions for RS and multisession RS (msRS), and to up to 6 weeks of conventional fractionation as stereotactic radiotherapy (SRT)...
January 11, 2017: HNO
https://www.readbyqxmd.com/read/28075183/systematic-evaluation-of-lung-tumor-motion-using-four-dimensional-computed-tomography
#4
Sebastian Sarudis, Anna Karlsson Hauer, Jan Nyman, Anna Bäck
BACKGROUND: Respiratory-induced lung tumor motion may decrease robustness and outcome of radiation therapy (RT) if not accounted for. This study provides detailed information on the motion distribution of lung tumors for a group of 126 patients treated with stereotactic body RT. MATERIAL AND METHODS: Four-dimensional computed tomography scans were reviewed to assess lung tumor motion. The tumor motion was determined by the center of mass shift based on a rigid registration of the breathing phases containing the largest positional differences in the inferior-superior (IS), left-right (LR), and anterior-posterior (AP) directions...
January 11, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28073946/a-randomized-phase-iii-trial-of-comparing-two-dose-fractionations-stereotactic-body-radiotherapy-sbrt-for-medically-inoperable-stage-ia-non-small-cell-lung-cancer-or-small-lung-lesions-clinically-diagnosed-as-primary-lung-cancer-japan-clinical-oncology-group
#5
EDITORIAL
Tomoki Kimura, Yasushi Nagata, Junko Eba, Shuichi Ozawa, Satoshi Ishikura, Taro Shibata, Yoshinori Ito, Masahiro Hiraoka, Yasumasa Nishimura
A randomized Phase III trial commenced in Japan in February 2016. Currently, 42 Gy in four fractions of stereotactic body radiotherapy prescribed at the D95% of the planning target volume, which is considered equal to the commonly used 48 Gy in four fractions at the isocenter using an old dose calculation algorithm, is the standard treatment in Japan for medically inoperable Stage IA non-small cell lung cancer and small lung lesions clinically diagnosed as primary lung cancer. This study aims to examine the superiority of 55 Gy in four fractions over 42 Gy in four fractions...
January 9, 2017: Japanese Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28071340/respiration-induced-intraorgan-deformation-of-the-liver
#6
Anna K Paulsson, Sue S Yom, Mekhail Anwar, Dilini Pinnaduwage, Atchar Sudhyadhom, Alexander R Gottschalk, Albert J Chang, Martina Descovich
Stereotactic body radiation therapy is a well-tolerated modality for the treatment of primary and metastatic liver lesions, and fiducials are often used as surrogates for tumor tracking during treatment. We evaluated respiratory-induced liver deformation by measuring the rigidity of the fiducial configuration during the breathing cycle. Seventeen patients, with 18 distinct treatment courses, were treated with stereotactic body radiosurgery using multiple fiducials. Liver deformation was empirically quantified by measuring the intrafiducial distances at different phases of respiration...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28070470/assessing-the-need-for-adjuvant-chemotherapy-after-stereotactic-body-radiation-therapy-in-early-stage-non-small-cell-lung-carcinoma
#7
Raphaël Jumeau, Houda Bahig, Édith Filion, Marie-Pierre Campeau, Louise Lambert, David Roberge, Andrei-Bogdan Gorgos, Toni Vu
PURPOSE: Surgery remains the standard treatment for medically operable patients with early-stage non-small cell lung carcinoma (NSCLC). Following surgical resection, adjuvant chemotherapy is recommended for large tumors >4 cm. For unfit patients, stereotactic body radiation therapy (SBRT) has emerged as an excellent alternative to surgery. This study aims to assess patterns of recurrence and discuss the role of chemotherapy after SBRT for NSCLC. METHODS: We reviewed patients treated with SBRT for primary early-stage NSCLC between 2009 and 2015...
November 29, 2016: Curēus
https://www.readbyqxmd.com/read/28068239/stereotactic-body-radiation-therapy-for-locally-advanced-pancreatic-cancer-a-systematic-review-and-pooled-analysis-of-19-trials
#8
REVIEW
Fausto Petrelli, Tiziana Comito, Antonio Ghidini, Valter Torri, Marta Scorsetti, Sandro Barni
PURPOSE: Although surgery is the standard of care for resectable pancreatic cancer (PC), standard-dose chemoradiation therapy and chemotherapy alone are suitable for patients with unresectable disease. Stereotactic body radiation therapy (SBRT) is an alternative, focused local therapy that delivers high radiation doses within a few fractions to the cancer, sparing the surrounding critical tissue. We performed a systematic review and pooled analysis of published trials to evaluate the efficacy and safety of this emerging treatment modality...
February 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28068233/multi-institutional-nomogram-predicting-survival-free-from-salvage-whole-brain-radiation-after-radiosurgery-in-patients-with-brain-metastases
#9
Daniel Gorovets, Diandra Ayala-Peacock, David J Tybor, Paul Rava, Daniel Ebner, Deus Cielo, Georg Norén, David E Wazer, Michael Chan, Jaroslaw T Hepel
PURPOSE: Optimal patient selection for stereotactic radiosurgery (SRS) as the initial treatment for brain metastases is complicated and controversial. This study aimed to develop a nomogram that predicts survival without salvage whole brain radiation therapy (WBRT) after upfront SRS. METHODS AND MATERIALS: Multi-institutional data were analyzed from 895 patients with 2095 lesions treated with SRS without prior or planned WBRT. Cox proportional hazards regression model was used to identify independent pre-SRS predictors of WBRT-free survival, which were integrated to build a nomogram that was subjected to bootstrap validation...
February 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28065427/systematic-review-on-the-treatment-of-isolated-local-recurrence-of-pancreatic-cancer-after-surgery-re-resection-chemoradiotherapy-and-sbrt
#10
REVIEW
Vincent P Groot, Hjalmar C van Santvoort, Steffi J E Rombouts, Jeroen Hagendoorn, Inne H M Borel Rinkes, Marco van Vulpen, Joseph M Herman, Christopher L Wolfgang, Marc G Besselink, I Quintus Molenaar
BACKGROUND: The majority of patients who have undergone a pancreatic resection for pancreatic cancer develop disease recurrence within two years. In around 30% of these patients, isolated local recurrence (ILR) is found. The aim of this study was to systematically review treatment options for this subgroup of patients. METHODS: A systematic search was performed in PubMed, Embase and the Cochrane Library. Studies reporting on the treatment of ILR after initial curative-intent resection of primary pancreatic cancer were included...
January 3, 2017: HPB: the Official Journal of the International Hepato Pancreato Biliary Association
https://www.readbyqxmd.com/read/28060412/optimizing-dual-energy-x-ray-parameters-for-the-exactrac-clinical-stereoscopic-imaging-system-to-enhance-soft-tissue-imaging
#11
Wesley A Bowman, James L Robar, Mike Sattarivand
PURPOSE: Stereoscopic x-ray image guided radiotherapy for lung tumors is often hindered by bone overlap and limited soft tissue contrast. This study aims to evaluate the feasibility of dual-energy imaging techniques and to optimize parameters of the ExacTrac stereoscopic imaging system to enhance soft tissue imaging for application to lung stereotactic body radiation therapy. METHODS: Simulated spectra and a physical lung phantom were used to optimize filter material, thickness, tube potentials, and weighting factors to obtain bone subtracted dual-energy images...
January 6, 2017: Medical Physics
https://www.readbyqxmd.com/read/28058956/neuromuscular-blockade-and-inspiratory-breath-hold-during-stereotactic-body-radiation-therapy-for-treatment-of-heart-base-tumors-in-four-dogs
#12
Krista L Kelsey, Lyndsay N Kubicek, Nicholas J Bacon, Terry Torres, Sheilah A Robertson
CASE DESCRIPTION 4 dogs were examined because of pleural effusion and ventricular tachycardia, coughing and supraventricular tachycardia, appendicular osteosarcoma, and syncopal episodes. CLINICAL FINDINGS In all 4 dogs, a heart base tumor was identified by means of thoracic CT. TREATMENT AND OUTCOME In all 4 dogs, the heart base tumors were treated by means of stereotactic body radiation therapy. Dogs were anesthetized, and neuromuscular blockade was achieved with atracurium or vecuronium. A circle rebreathing system with 15 m (50 feet) of anesthetic tubing coursing through the vault wall was used to connect the patient to the anesthesia machine, which was located in the control room...
January 15, 2017: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/28058710/stereotactic-ablative-radiotherapy-for-patients-with-unresectable-or-medically-inoperable-cholangiocarcinoma
#13
Ming-Yueh Liu, Cheng-Hsiang Lo, Chun-Shu Lin, Hsing-Lung Chao, Jen-Fu Yang, Kuen-Tze Lin, Chao-Yueh Fan, Yu-Fu Su, Wen-Yen Huang
PURPOSE: The role of stereotactic ablative radiotherapy (SABR) in patients with unresectable or medically inoperable cholangiocarcinoma remains unclear. We examined the efficacy and safety of SABR in this group of patients. METHODS: From January 2008 to December 2014, 15 patients with 17 lesions were included in this study. The lesions included 14 intrahepatic, 1 hilar, and 2 distal bile duct tumors. Three patients were classified as medically inoperable because of old age or multiple comorbidities...
January 5, 2017: Tumori
https://www.readbyqxmd.com/read/28058466/-malignization-of-vestibular-schwannoma-13%C3%A2-years-after-radiation-therapy
#14
S Simmermacher, D Vordermark, T Kegel, C Strauss
This article presents a case of malignant transformation of vestibular schwannoma 13 years after stereotactic radiation therapy, which lead to an acute life-threatening condition. Although the observation is currently only based on case reports, an increasing number of these support the hypothesis that there is a relevant risk of malignant transformation in the long-term course of previously irradiated vestibular schwannomas. Therefore, long-term MRI follow-up should be considered.
January 5, 2017: HNO
https://www.readbyqxmd.com/read/28057036/clinical-outcomes-of-stage-i-and-iia-non-small-cell-lung-cancer-patients-treated-with-stereotactic-body-radiotherapy-using-a-real-time-tumor-tracking-radiotherapy-system
#15
Norio Katoh, Itaru Soda, Hiroyasu Tamamura, Shotaro Takahashi, Yusuke Uchinami, Hiromichi Ishiyama, Kiyotaka Ota, Tetsuya Inoue, Rikiya Onimaru, Keiko Shibuya, Kazushige Hayakawa, Hiroki Shirato
PURPOSE: To investigate the clinical outcomes of stage I and IIA non-small cell lung cancer (NSCLC) patients treated with stereotactic body radiotherapy (SBRT) using a real-time tumor-tracking radiotherapy (RTRT) system. MATERIALS AND METHODS: Patterns-of-care in SBRT using RTRT for histologically proven, peripherally located, stage I and IIA NSCLC was retrospectively investigated in four institutions by an identical clinical report format. Patterns-of-outcomes was also investigated in the same manner...
January 5, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28054837/radiosurgery-alters-the-endothelial-surface-proteome-externalized-intracellular-molecules-as-potential-vascular-targets-in-irradiated-brain-arteriovenous-malformations
#16
Lucinda S McRobb, Vivienne S Lee, Margaret Simonian, Zhenjun Zhao, Santhosh George Thomas, Markus Wiedmann, Jude V Amal Raj, Michael Grace, Vaughan Moutrie, Matthew J McKay, Mark P Molloy, Marcus A Stoodley
Stereotactic radiosurgery (SRS) is an established treatment for brain arteriovenous malformations (AVMs) that drives blood vessel closure through cellular proliferation, thrombosis and fibrosis, but is limited by a delay to occlusion of 2-3 years and a maximum treatable size of 3 cm. In this current study we used SRS as a priming tool to elicit novel protein expression on the endothelium of irradiated AVM vessels, and these proteins were then targeted with prothrombotic conjugates to induce rapid thrombosis and vessel closure...
January 5, 2017: Radiation Research
https://www.readbyqxmd.com/read/28054137/-local-treatment-of-solitary-intrapulmonary-malignant-nodules
#17
J Op den Winkel, F Eichhorn, S Rieken, H Dienemann
DEFINITION: Intrapulmonary nodules generally represent an incidental finding in the roentgenogram or computed tomography (CT) scan of the chest. They are defined as single, well-circumscribed, radiographic opaque lesions that measures up to 3 cm in diameter and are surrounded completely by aerated lung. The probability of malignancy directly correlates with increasing diameter. Lesions that have a diameter of 1 cm or larger require direct evaluation. THERAPY: Surgery is the first option for patients with a malignant lesion, given an acceptable perioperative risk; for high-risk patients either radiofrequency ablation (RFA) or stereotactic body radiation therapy (SBRT) should be offered...
January 4, 2017: Der Radiologe
https://www.readbyqxmd.com/read/28050151/eastern-canadian-gastrointestinal-cancer-consensus-conference-2016
#18
D Bossé, T Ng, C Ahmad, A Alfakeeh, I Alruzug, J Biagi, J Brierley, P Chaudhury, S Cleary, B Colwell, C Cripps, L A Dawson, M Dorreen, E Ferland, P Galiatsatos, S Girard, S Gray, F Halwani, N Kopek, A Mahmud, G Martel, L Robillard, B Samson, M Seal, J Siddiqui, L Sideris, S Snow, M Thirwell, M Vickers, R Goodwin, R Goel, T Hsu, E Tsvetkova, B Ward, T Asmis
The annual Eastern Canadian Gastrointestinal Cancer Consensus Conference 2016 was held in Montreal, Quebec, 5-7 February. Experts in radiation oncology, medical oncology, surgical oncology, and infectious diseases involved in the management of patients with gastrointestinal malignancies participated in presentations and discussion sessions for the purpose of developing the recommendations presented here. This consensus statement addresses multiple topics: ■ Follow-up and survivorship of patients with resected colorectal cancer■ Indications for liver metastasectomy■ Treatment of oligometastases by stereotactic body radiation therapy■ Treatment of borderline resectable and unresectable pancreatic cancer■ Transarterial chemoembolization in hepatocellular carcinoma■ Infectious complications of antineoplastic agents...
December 2016: Current Oncology
https://www.readbyqxmd.com/read/28049169/management-of-stage-i-and-ii-nonsmall-cell-lung-cancer
#19
Fiona McDonald, Michèle De Waele, Lizza E L Hendriks, Corinne Faivre-Finn, Anne-Marie C Dingemans, Paul E Van Schil
The incidence of stage I and II nonsmall cell lung cancer is likely to increase with the ageing population and introduction of screening for high-risk individuals. Optimal management requires multidisciplinary collaboration. Local treatments include surgery and radiotherapy and these are currently combined with (neo)adjuvant chemotherapy in specific cases to improve long-term outcome. Targeted therapies and immunotherapy may also become important therapeutic modalities in this patient group. For resectable disease in patients with low cardiopulmonary risk, complete surgical resection with lobectomy remains the gold standard...
January 2017: European Respiratory Journal: Official Journal of the European Society for Clinical Respiratory Physiology
https://www.readbyqxmd.com/read/28048907/su-f-r-46-predicting-distant-failure-in-lung-sbrt-using-multi-objective-radiomics-model
#20
Z Zhou, M Folkert, P Iyengar, Y Zhang, J Wang
PURPOSE: To predict distant failure in lung stereotactic body radiation therapy (SBRT) in early stage non-small cell lung cancer (NSCLC) by using a new multi-objective radiomics model. METHODS: Currently, most available radiomics models use the overall accuracy as the objective function. However, due to data imbalance, a single object may not reflect the performance of a predictive model. Therefore, we developed a multi-objective radiomics model which considers both sensitivity and specificity as the objective functions simultaneously...
June 2016: Medical Physics
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