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adaptive radiotherapy

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https://www.readbyqxmd.com/read/29333354/novel-wavelet-based-segmentation-of-prostate-cbct-images-with-implanted-calypso-transponders
#1
Yingxia Liu, Ziad Saleh, Yulin Song, Maria Chan, Xiang Li, Chengyu Shi, Xin Qian, Xiaoli Tang
Segmentation of prostate Cone Beam CT (CBCT) images is an essential step towards real-time adaptive radiotherapy (ART). It is challenging for Calypso patients, as more artifacts generated by the beacon transponders are present on the images. We herein propose a novel wavelet-based segmentation algorithm for rectum, bladder, and prostate of CBCT images with implanted Calypso transponders. For a given CBCT, a Moving Window-Based Double Haar (MWDH) transformation is applied first to obtain the wavelet coefficients...
August 2017: International Journal of Medical Physics, Clinical Engineering and Radiation Oncology
https://www.readbyqxmd.com/read/29333123/evaluation-of-deformable-image-registration-dir-methods-for-dose-accumulation-in-nasopharyngeal-cancer-patients-during-radiotherapy
#2
Wannapha Nobnop, Imjai Chitapanarux, Hudsaleark Neamin, Somsak Wanwilairat, Vicharn Lorvidhaya, Taweap Sanghangthum
Introduction: Deformable image registration (DIR) is used to modify structures according to anatomical changes for observing the dosimetric effect. In this study, megavoltage computed tomography (MVCT) images were used to generate cumulative doses for nasopharyngeal cancer (NPC) patients by various DIR methods. The performance of the multiple DIR methods was analysed, and the impact of dose accumulation was assessed. Patients and methods: The study consisted of five NPC patients treated with a helical tomotherapy unit...
December 2017: Radiology and Oncology
https://www.readbyqxmd.com/read/29332358/a-study-on-basic-demographic-and-disease-characteristics-of-cancer-diagnosed-syrian-refugees-treated-in-the-border-city-of-turkey-sanliurfa-a-hospital-based-retrospective-case-series-study
#3
Yasemin Bakkal Temi, Ali Murat Sedef, Serkan Gokcay, Hatice Coskun, Sedenay Oskeroglu Kaplan, Ozlem Ozkul, Huseyin Mertsoylu, Fatih Kose
PURPOSE: Turkey hosts around 3 million Syrian refugees which is more than any other country in the world. Along with some other adaptation issues like cultural, language, and economic difficulties, significant problems in managing medical problems, chronic diseases like cancer in particular, have to be fixed. However, there are few studies which explore main patient and clinicopathological characteristics in Syrian refugees with cancer. The purpose of this study was to highlight the aforementioned characteristics along with management issues after cancer diagnosis of these patients...
November 2017: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
https://www.readbyqxmd.com/read/29319036/the-use-of-adaptive-intensity-modulated-radiotherapy-in-the-treatment-of-small-cell-carcinoma-lung-refractory-to-chemotherapy-in-a-patient-with-preexisting-interstitial-lung-disease
#4
Sarthak Tandon, Munish Gairola, Manoj Pal, Archana Aggarwal, Kanika Sharma, Ahmad Masroor Karimi, Avik Mandal, Rajiv Goyal, Ullas Batra, Inderjit Kaur
This is a case report of a 60-year-old diabetic, hypertensive male with a good performance status and a history of bilateral interstitial lung disease with a left upper lobe lung mass diagnosed to be a Stage IIB mixed small-cell/squamous cell carcinoma which was refractory to carboplatin- and etoposide-based chemotherapy. The patient was then taken up for adaptive intensity-modulated radiotherapy with tighter margin under image guidance with a mid-treatment replanning done at 25#. Acute toxicities were assessed weekly and showed no Grade 3 or more reactions...
January 2018: Lung India: Official Organ of Indian Chest Society
https://www.readbyqxmd.com/read/29316134/dosimetric-benefit-of-adaptive-radiotherapy-in-the-neoadjuvant-management-of-canine-and-feline-thymoma-an-exploratory-case-series
#5
C Rohrer Bley, V Meier, U Schneider
While surgery is the treatment of choice for thymomas, complete excision is not possible in a significant proportion of cases. For these patients, radiotherapy can be used as neoadjunctive, post-operative adjunctive or sole therapy. During radiotherapy, rapid biological clearance of tumour cells is often observed, requiring adaptation of the treatment plan. Adaptive radiation therapy (RT) is a dynamic process, whereby the treatment plan is altered throughout the treatment course due to changes in morphologic, functional or positioning changes...
January 8, 2018: Veterinary and Comparative Oncology
https://www.readbyqxmd.com/read/29299945/a-review-of-plan-library-approaches-in-adaptive-radiotherapy-of-bladder-cancer
#6
Shane D Collins, Michelle M Leech
BACKGROUND: Large variations in the shape and size of the bladder volume are commonly observed in bladder cancer radiotherapy (RT). The clinical target volume (CTV) is therefore frequently inadequately treated and large isotropic margins are inappropriate in terms of dose to organs at risk (OAR); thereby making adaptive radiotherapy (ART) attractive for this tumour site. There are various methods of ART delivery, however, for bladder cancer, plan libraries are frequently used. MATERIAL AND METHODS: A review of published studies on plan libraries for bladder cancer using four databases (Pubmed, Science Direct, Embase and Cochrane Library) was conducted...
January 4, 2018: Acta Oncologica
https://www.readbyqxmd.com/read/29297618/siop-podc-adapted-treatment-guidelines-for-low-grade-gliomas-in-low-and-middle-income-settings
#7
Laila Hessissen, Jeannette Parkes, Nisreen Amayiri, Naureen Mushtaq, Nongnuch Sirachainan, Yavuz Anacak, Dipayan Mitra, Anthony Figaji, Antoinette Schouten-van Meeteren, Michael Sullivan, Hester Burger, Alan Davidson, Eric Bouffet, Simon Bailey
Effective treatment of children with low grade glioma (LGG) requires a functioning multi-disciplinary team with adequate neurosurgical, neuroradiological, pathological, radiotherapy and chemotherapy facilities and personnel. In addition, the treating centre should have the capacity to manage a variety of LGG and treatment-associated complications. These requirements have made it difficult for many centers in low and middle-income countries (LMIC) to offer effective treatment and follow up. This article provides management recommendations for children with LGG according to the level of facilities available...
December 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/29289336/-hodgkin-lymphoma-current-and-future-therapeutic-strategies
#8
REVIEW
Anthony Turpin, Jean-Marie Michot, Emmanuelle Kempf, Renaud Mazeron, Peggy Dartigues, Angela Boros, Serge Bonnetier, Cristina Castilla-Llorente, Tereza Coman, Alina Danu, David Ghez, Sylvain Pilorge, Julia Arfi-Rouche, Laurent Dercle, Jean-Charles Soria, Patrice Carde, Vincent Ribrag, Christophe Fermé, Julien Lazarovici
Hodgkin lymphoma (HL) is a cancer that mostly affects young people, in which modern therapeutic strategies using chemotherapy and radiotherapy result in a cure rate exceeding 80%. Survivors are exposed to long-term consequences of treatments, such as secondary malignancies and cardiovascular diseases, whose mortality exceeds the one of the disease itself, with long-term follow-up. The current therapeutic strategy in HL, based on the assessment of initial risk factors, is the result of large clinical trials led by the main international cooperating groups...
December 27, 2017: Bulletin du Cancer
https://www.readbyqxmd.com/read/29277446/phase-i-trial-of-stereotactic-mr-guided-online-adaptive-radiation-therapy-smart-for-the-treatment-of-oligometastatic-or-unresectable-primary-malignancies-of-the-abdomen
#9
Lauren Henke, Rojano Kashani, Clifford Robinson, Austen Curcuru, Todd DeWees, Jeffrey Bradley, Olga Green, Jeff Michalski, Sasa Mutic, Parag Parikh, Jeffrey Olsen
PURPOSE/OBJECTIVES: SBRT is used to treat oligometastatic or unresectable primary abdominal malignancies, although ablative dose delivery is limited by proximity of organs-at-risk (OAR). Stereotactic, magnetic resonance (MR)-guided online-adaptive radiotherapy (SMART) may improve SBRT's therapeutic ratio. This prospective Phase I trial assessed feasibility and potential advantages of SMART to treat abdominal malignancies. MATERIALS/METHODS: Twenty patients with oligometastatic or unresectable primary liver (n = 10) and non-liver (n = 10) abdominal malignancies underwent SMART...
December 22, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29276135/-external-beam-radiotherapy-cone-beam-computed-tomography-based-dose-calculation
#10
A Barateau, M Céleste, C Lafond, O Henry, S Couespel, A Simon, O Acosta, R de Crevoisier, N Périchon
In external beam radiotherapy, the dose planning is currently based on computed tomography (CT) images. A relation between Hounsfield numbers and electron densities (or mass densities) is necessary for dose calculation taking heterogeneities into account. In image-guided radiotherapy process, the cone beam CT is classically used for tissue visualization and registration. Cone beam CT for dose calculation is also attractive in dose reporting/monitoring perspectives and particularly in a context of dose-guided adaptive radiotherapy...
December 21, 2017: Cancer Radiothérapie: Journal de la Société Française de Radiothérapie Oncologique
https://www.readbyqxmd.com/read/29276059/clinical-characteristics-associated-with-racial-disparities-in-endometrial-cancer-outcomes-a-surveillance-epidemiology-and-end-results-analysis
#11
Shivani Sud, Jordan Holmes, Michael Eblan, Ronald Chen, Ellen Jones
OBJECTIVES: Racial disparities exist for endometrial cancer. We examined patterns of care and factors associated with poor outcomes for Black women with endometrial cancer. METHODS: We studied 110,826 endometrial cancer patients diagnosed between 1980 and 2008 with minimum 5years follow-up in the Surveillance, Epidemiology, and End Results database. Trends over time in sociodemographics, disease characteristics and treatment factors were analyzed over four eras: 1980-1989, 1990-1999, 2000-2004, 2005-2008...
December 21, 2017: Gynecologic Oncology
https://www.readbyqxmd.com/read/29273076/highly-conformal-combined-radiotherapy-with-cisplatin-and-gemcitabine-for-treatment-of-loco-regionally-advanced-cervical-cancer-a-retrospective-study
#12
Nikola Cihoric, Alexandros Tsikkinis, Eugenia Vlaskou Badra, Markus Glatzer, Urban Novak, Amina Scherz, Mohamed Shelan, Ivan Soldatovic, Chittazhathu Kurian Kuruvilla Yojena, Daniel M Aebersold, Kristina Lössl
BACKGROUND: Cisplatin and gemcitabine combined with conventional radiation therapy in the treatment of cervical cancer patients results in a favorable outcome but with excess toxicity. The purpose of this study was to evaluate the toxicity profile of dual chemotherapy and highly conformal external beam radiotherapy with image guided adaptive brachytherapy. METHODS: Seventeen patients with cervical carcinoma FIGO stage IB2-IIIB were treated with curative intent between 2011 and 2015...
December 22, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/29248399/palliative-chemoradiotherapy-versus-radiotherapy-alone-for-dysphagia-in-advanced-oesophageal-cancer-a-multicentre-randomised-controlled-trial-trog-03-01
#13
Michael G Penniment, Paolo B De Ieso, Jennifer A Harvey, Sonya Stephens, Heather-Jane Au, Christopher J O'Callaghan, Andrew Kneebone, Samuel Y Ngan, Iain G Ward, Rajarshi Roy, Jennifer G Smith, Tirath Nijjar, James J Biagi, Liam A Mulroy, Rebecca Wong
BACKGROUND: A short course of radiotherapy is commonly prescribed for palliative relief of malignant dysphagia in patients with incurable oesophageal cancer. We compared chemoradiotherapy with radiotherapy alone for dysphagia relief in the palliative setting. METHODS: This multicentre randomised controlled trial included patients with advanced or metastatic oesophageal cancer who were randomly assigned (1:1) through a computer-generated adaptive biased coin design to either palliative chemoradiotherapy or radiotherapy alone for treatment of malignant dysphagia at 22 hospitals in Australia, Canada, New Zealand, and the UK...
December 13, 2017: Lancet. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/29246585/exposure-of-the-lungs-in-breast-cancer-radiotherapy-a-systematic-review-of-lung-doses-published-2010-2015
#14
Marianne C Aznar, Frances K Duane, Sarah C Darby, Zhe Wang, Carolyn W Taylor
BACKGROUND AND PURPOSE: We report a systematic review of lung radiation doses from breast cancer radiotherapy. METHODS AND MATERIALS: Studies describing breast cancer radiotherapy regimens published during 2010-2015 and reporting lung dose were included. Doses were compared between different countries, anatomical regions irradiated, techniques and use of breathing adaptation. RESULTS: 471 regimens from 32 countries were identified. The average mean ipsilateral lung dose (MLDipsi) was 9...
December 12, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29246584/serial-4dct-4dpet-imaging-to-predict-and-monitor-response-for-locally-advanced-non-small-cell-lung-cancer-chemo-radiotherapy
#15
Jean-Pierre Bissonnette, Mei Ling Yap, Katy Clarke, Andrea Shessel, Jane Higgins, Douglass Vines, Eshetu G Atenafu, Nathan Becker, Claudia Leavens, Andrea Bezjak, David A Jaffray, Alexander Sun
BACKGROUND AND PURPOSE: A FDG-PET/CT image feature with optimal prognostic potential for locally-advanced non-small cell lung cancer (LA-NSCLC) patients has yet to be identified, and neither has the optimal time for FDG-PET/CT response assessment; furthermore, nodal features have been largely ignored in the literature. We propose to identify image features or imaging time point with maximal prognostic power. MATERIALS AND METHODS: Consecutive consenting patients with LA-NSCLC receiving curative intent CRT were enrolled...
December 12, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29244902/feasibility-of-predicting-tumor-motion-using-online-data-acquired-during-treatment-and-a-generalized-neural-network-optimized-with-offline-patient-tumor-trajectories
#16
Troy Teo, Syed Bilal Ahmed, Nadia Alayoubi, Neil Bruce, Ethan Lyn, Stephen Pistorius
PURPOSE: The accurate prediction of intra-fraction lung tumor motion is required to compensate for system latency in image-guided adaptive radiotherapy systems. The goal of this study was to identify an optimal prediction model that has a short learning period so that prediction and adaptation can commence soon after treatment begins, and requires minimal re-optimization for individual patients. Specifically, the feasibility of predicting tumor position using a combination of a generalized (i...
December 15, 2017: Medical Physics
https://www.readbyqxmd.com/read/29236558/the-paradox-of-adaptive-responses-and-iso-effect-per-fraction
#17
Benjamin J Blyth
PURPOSE: Despite decades of research into radiation-induced adaptive responses, where prior irradiation changes the response to subsequent irradiations, the field of radiation oncology relies upon models of tumour control that assume that each radiation therapy fraction reproduces the same effect, known as iso-effect per fraction. Can these radiobiology principles both be true, forming a paradox, or is only one of them right? Here, the apparent co-existence of these two contradictory observations is considered, examining how adaptive responses might apply in radiotherapy scenarios which are inconsistent with the majority of adaptive response experimental designs...
December 13, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/29225692/recent-advances-in-radiation-oncology
#18
REVIEW
Cristina Garibaldi, Barbara Alicja Jereczek-Fossa, Giulia Marvaso, Samantha Dicuonzo, Damaris Patricia Rojas, Federica Cattani, Anna Starzyńska, Delia Ciardo, Alessia Surgo, Maria Cristina Leonardi, Rosalinda Ricotti
Radiotherapy (RT) is very much a technology-driven treatment modality in the management of cancer. RT techniques have changed significantly over the past few decades, thanks to improvements in engineering and computing. We aim to highlight the recent developments in radiation oncology, focusing on the technological and biological advances. We will present state-of-the-art treatment techniques, employing photon beams, such as intensity-modulated RT, volumetric-modulated arc therapy, stereotactic body RT and adaptive RT, which make possible a highly tailored dose distribution with maximum normal tissue sparing...
2017: Ecancermedicalscience
https://www.readbyqxmd.com/read/29218271/magnetic-resonance-imaging-in-precision-radiation-therapy-for-lung-cancer
#19
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/29198328/the-role-of-nuclear-factor-kappa-b-signaling-in-human-cervical-cancer
#20
REVIEW
Sam Tilborghs, Jerome Corthouts, Yannick Verhoeven, David Arias, Christian Rolfo, Xuan Bich Trinh, Peter A van Dam
Background The Nuclear Factor kappaB (NF-kB) family consists of transcription factors that play a complex and essential role in the regulation of immune responses and inflammation. NF-kB has recently generated considerable interest as it has been implicated in human cancer initiation, progression and resistance to treatment. In the present comprehensive review the different aspects of NF-kB signaling in the carcinogenesis of cancer of the uterine cervix are discussed. NF-kB functions as part of a network, which determines the pattern of its effects on the expression of several other genes (such as crosstalks with reactive oxygen species, p53, STAT3 and miRNAS) and thus its function...
December 2017: Critical Reviews in Oncology/hematology
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