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Radiation Oncology

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https://www.readbyqxmd.com/read/29769143/clinical-outcome-of-elderly-patients-%C3%A2-70-years-with-esophageal-cancer-undergoing-definitive-or-neoadjuvant-radio-chemo-therapy-a-retrospective-single-center-analysis
#1
Franziska Walter, David Böckle, Nina-Sophie Schmidt-Hegemann, Rebecca Köpple, Sabine Gerum, Stefan Boeck, Martin Angele, Claus Belka, Falk Roeder
BACKGROUND: To analyse the outcome of elderly patients (≥70 years) with esophageal cancer treated with curative intent radio(chemo)therapy. METHODS: Fifty five patients (median 75 years) receiving curative intent radio(chemo)therapy for esophageal cancer from 1999 to 2015 were retrospectively analyzed. Most patients showed locally advanced disease (T3/4:78%, N+:58%) with squamous cell histology (74%). Charlson comorbidity score was > 1 in 27%. 48 patients (87%) received definitive treatment while 7 patients were treated neoadjuvantly...
May 16, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29769103/the-alfa-and-beta-of-tumours-a-review-of-parameters-of-the-linear-quadratic-model-derived-from-clinical-radiotherapy-studies
#2
REVIEW
C M van Leeuwen, A L Oei, J Crezee, A Bel, N A P Franken, L J A Stalpers, H P Kok
BACKGROUND: Prediction of radiobiological response is a major challenge in radiotherapy. Of several radiobiological models, the linear-quadratic (LQ) model has been best validated by experimental and clinical data. Clinically, the LQ model is mainly used to estimate equivalent radiotherapy schedules (e.g. calculate the equivalent dose in 2 Gy fractions, EQD2 ), but increasingly also to predict tumour control probability (TCP) and normal tissue complication probability (NTCP) using logistic models...
May 16, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29769101/a-new-strategy-for-volumetric-modulated-arc-therapy-planning-using-autoplanning-based-multicriteria-optimization-for-nasopharyngeal-carcinoma
#3
Juanqi Wang, Zhi Chen, Weiwei Li, Wei Qian, Xiaosheng Wang, Weigang Hu
BACKGROUND: A new strategy for making the appropriate choice of the representative optimization parameters in planning processes and accurate selection criteria during Pareto surface navigation for general multicriteria optimization (MCO) was recommended in the study. The purpose was to combine both benefits of AutoPlanning optimization and MCO (APMCO) for achieving an individual volumetric-modulated arc therapy (VMAT) plan according to the clinically achieved patient-specific tradeoff among conflicting priorities...
May 16, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29769097/the-clinical-features-of-radiation-cataract-in-patients-with-ocular-adnexal-mucosa-associated-lymphoid-tissue-lymphoma
#4
Kanae Fukutsu, Satoru Kase, Kan Ishijima, Rumiko Kinoshita, Susumu Ishida
BACKGROUND: To examine the clinical features of radiation cataract in patients with ocular adnexal mucosa-associated lymphoid tissue (MALT) lymphoma. METHODS: Twenty-one patients with 26 eyes diagnosed with ocular adnexal MALT lymphoma (26 eyes), who were treated in Hokkaido University Hospital, were retrospectively reviewed based on medical records. RESULTS: Out of the 21 patients, 16 patients (21 eyes) received radiation therapy (RT) with a total dose of 30 Gy...
May 16, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29764450/evaluation-of-target-dose-inhomogeneity-in-breast-cancer-treatment-due-to-tissue-elemental-differences
#5
A Fogliata, F De Rose, A Stravato, G Reggiori, S Tomatis, M Scorsetti, L Cozzi
BACKGROUND: Monte Carlo simulations were run to estimate the dose variations generated by thedifference arising from the chemical composition of the tissues. METHODS: CT datasets of five breast cancer patients were selected. Mammary gland was delineated as clinical target volume CTV, as well as CTV_lob and CTV_fat, being the lobular and fat fractions of the entire mammary gland. Patients were planned for volumetric modulated arc therapy technique, optimized in the Varian Eclipse treatment planning system...
May 15, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29764449/primo-software-as-a-tool-for-monte-carlo-simulations-of-intensity-modulated-radiotherapy-a-feasibility-study
#6
Alessandro Esposito, Sofia Silva, Jorge Oliveira, Joana Lencart, João Santos
BACKGROUND: IMRT provides higher dose conformation to the target and dose sparing to surrounding tissues than 3DCRT. Monte Carlo method in Medical Physics is not a novelty to approach dosimetric problems. A new PENELOPE based code named PRIMO recently was published. The most intriguing features of PRIMO are the user-friendly approach, the stand-alone property and the built-in definition of different linear accelerators models. Nevertheless, IMRT simulations are not yet implemented. METHODS: A Varian Trilogy with a Millennium120 MLC and a Varian Novalis with 120HD MLC were studied...
May 15, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29751842/psma-pet-based-radiotherapy-a-review-of-initial-experiences-survey-on-current-practice-and-future-perspectives
#7
REVIEW
Sebastian Zschaeck, Fabian Lohaus, Marcus Beck, Gregor Habl, Stephanie Kroeze, Constantinos Zamboglou, Stefan Alexander Koerber, Jürgen Debus, Tobias Hölscher, Peter Wust, Ute Ganswindt, Alexander D J Baur, Klaus Zöphel, Nikola Cihoric, Matthias Guckenberger, Stephanie E Combs, Anca Ligia Grosu, Pirus Ghadjar, Claus Belka
68 Gallium prostate specific membrane antigen (PSMA) ligand positron emission tomography (PET) is an increasingly used imaging modality in prostate cancer, especially in cases of tumor recurrence after curative intended therapy. Owed to the novelty of the PSMA-targeting tracers, clinical evidence on the value of PSMA-PET is moderate but rapidly increasing. State of the art imaging is pivotal for radiotherapy treatment planning as it may affect dose prescription, target delineation and use of concomitant therapy...
May 11, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29747666/survival-of-rats-bearing-advanced-intracerebral-f-98-tumors-after-glutathione-depletion-and-microbeam-radiation-therapy-conclusions-from-a-pilot-project
#8
E Schültke, E Bräuer-Krisch, H Blattmann, H Requardt, J A Laissue, G Hildebrandt
BACKGROUND: Resistance to radiotherapy is frequently encountered in patients with glioblastoma multiforme. It is caused at least partially by the high glutathione content in the tumour tissue. Therefore, the administration of the glutathione synthesis inhibitor Buthionine-SR-Sulfoximine (BSO) should increase survival time. METHODS: BSO was tested in combination with an experimental synchrotron-based treatment, microbeam radiation therapy (MRT), characterized by spatially and periodically alternating microscopic dose distribution...
May 10, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29739431/optimal-collimator-rotation-based-on-the-outline-of-multiple-brain-targets-in-vmat
#9
Jung-In Kim, Beom Seok Ahn, Chang Heon Choi, Jong Min Park, So-Yeon Park
BACKGROUND: The aim of this study was to investigate the dosimetric quality in volumetric modulated arc therapy (VMAT) plans with optimal collimator angles that can represent the outline of multiple brain targets. METHODS: Twenty patients with multiple target volumes in the brain cases were selected retrospectively. To better represent the outline of the multiple brain targets, four conformal arc plans were generated for each patient using one full arc with four collimator settings...
May 9, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29739436/re-irradiation-in-lung-disease-by-sbrt-a-retrospective-single-institutional-study
#10
Donatella Caivano, Maurizio Valeriani, Sara De Matteis, Paolo Bonome, Ivana Russo, Vitaliana De Sanctis, Giuseppe Minniti, Mattia Falchetto Osti
BACKGROUND: The loco regional relapse is frequent in the lung disease. The aim of this study was to evaluate the outcomes of re-irradiation by SBRT in terms of Local Control (LC) and toxicities. METHODS: From April 2011 to December 2016, twenty-two patients received a re-irradiation by SBRT. Twenty- seven lesions were treated. The medium BED(10) of re-irradiation was 100.6 Gy (range: 48-151.2 Gy) and the medium EQD2(10) was 93.8 Gy (range: 40-126 Gy). In the previous treatment the medium BED(10) was 97...
May 8, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29739420/patterns-of-failure-after-resection-of-extrahepatic-bile-duct-cancer-implications-for-adjuvant-radiotherapy-indication-and-treatment-volumes
#11
Hoon Sik Choi, Ki Mun Kang, Bae Kwon Jeong, Hojin Jeong, Yun Hee Lee, In Bong Ha, Tae Gyu Kim, Jin Ho Song
BACKGROUND: The role of adjuvant radiotherapy (RT) and setting proper RT target volumes have not been clearly demonstrated for extrahepatic bile duct (EHBD) cancer, due to the rarity of the disease and the lack of randomized trials. This study was conducted to evaluate the indication and treatment volume for adjuvant RT in EHBD cancer patients by identifying the prognostic factors for loco-regional (LR) failure, and analyze the patterns of LR failure. METHODS: Ninety-three patients with EHBD cancer, who underwent resection without adjuvant RT, at 2 medical centers, between 2001 and 2016, were analyzed retrospectively...
May 8, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29739417/evaluation-of-particle-radiotherapy-for-the-re-irradiation-of-recurrent-intracranial-meningioma
#12
Rami A El Shafie, Maja Czech, Kerstin A Kessel, Daniel Habermehl, Dorothea Weber, Stefan Rieken, Nina Bougatf, Oliver Jäkel, Jürgen Debus, Stephanie E Combs
BACKGROUND: With the advance of modern irradiation techniques, the role of radiotherapy (RT) for intracranial meningioma has increased significantly throughout the past years. Despite that tumor's generally favorable outcome with local control rates of up to 90% after ten years, progression after RT does occur. In those cases, re-irradiation is often difficult due to the limited radiation tolerance of the surrounding tissue. The aim of this analysis is to determine the value of particle therapy with its better dose conformity and higher biological efficacy for re-irradiating recurrent intracranial meningioma...
May 8, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29728105/identifying-risk-factors-for-l-hermitte-s-sign-after-imrt-for-head-and-neck-cancer
#13
Hannah M Laidley, David J Noble, Gill C Barnett, Julia R Forman, Amy M Bates, Richard J Benson, Sarah J Jefferies, Rajesh Jena, Neil G Burnet
BACKGROUND: L'Hermitte's sign (LS) after chemoradiotherapy for head and neck cancer appears related to higher spinal cord doses. IMRT plans limit spinal cord dose, but the incidence of LS remains high. METHODS: One hundred seventeen patients treated with TomoTherapy™ between 2008 and 2015 prospectively completed a side-effect questionnaire (VoxTox Trial Registration: UK CRN ID 13716). Baseline patient and treatment data were collected. Radiotherapy plans were analysed; mean and maximum spinal cord dose and volumes receiving 10, 20, 30 and 40 Gy were recorded...
May 4, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29720197/the-prognostic-role-of-hemoglobin-levels-in-patients-undergoing-concurrent-chemo-radiation-for-anal-cancer
#14
Pierfrancesco Franco, Francesco Montagnani, Francesca Arcadipane, Chiara Casadei, Kalliopi Andrikou, Stefania Martini, Giuseppe Carlo Iorio, Mario Scartozzi, Massimiliano Mistrangelo, Lorenzo Fornaro, Paola Cassoni, Stefano Cascinu, Umberto Ricardi, Andrea Casadei Gardini
BACKGROUND: Concurrent chemo-radiation (CT-RT) is a standard therapy for squamous cell carcinoma of anal canal. Different clinical and biological factors may potentially affect outcome. We investigated the prognostic role of baseline hemoglobin (Hb) in a cohort of anal cancer patients submitted to CT-RT with 5-fluorouracil and mitomycin C. METHODS: Up to 161 patients with clinical stage T1-T4/N0-N3/M0 were treated. Response was assessed at 6 weeks and thereafter at 3, 6 and 12 months...
May 2, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29716649/preexisting-radiological-interstitial-lung-abnormalities-are-a-risk-factor-for-severe-radiation-pneumonitis-in-patients-with-small-cell-lung-cancer-after-thoracic-radiation-therapy
#15
Fangjuan Li, Ziyang Zhou, Ailu Wu, Yong Cai, Hongyu Wu, Ming Chen, Shixiong Liang
BACKGROUND: Previous studies reported that patients with preexisting radiological interstitial lung abnormalities (ILAs) were more susceptible to developing radiation pneumonitis (RP) after thoracic radiation therapy (TRT). The present study aimed to evaluate the incidence and predictors of RP after TRT in patients with small-cell lung cancer (SCLC) with or without preexisting radiological ILAs. METHODS: A total of 95 consecutive patients with SCLC between January 2015 and December 2015, who were treated with thoracic intensity-modulated radiation therapy at Shanghai Pulmonary Hospital,Tongji University School of Medicine, were analyzed...
May 2, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29716617/focal-dose-escalation-for-prostate-cancer-using-68-ga-hbed-cc-psma-pet-ct-and-mri-a-planning-study-based-on-histology-reference
#16
Constantinos Zamboglou, Benedikt Thomann, Khodor Koubar, Peter Bronsert, Tobias Krauss, Hans C Rischke, Ilias Sachpazidis, Vanessa Drendel, Nasr Salman, Kathrin Reichel, Cordula A Jilg, Martin Werner, Philipp T Meyer, Michael Bock, Dimos Baltas, Anca L Grosu
BACKGROUND: Focal radiation therapy has gained of interest in treatment of patients with primary prostate cancer (PCa). The question of how to define the intraprostatic boost volume is still open. Previous studies showed that multiparametric MRI (mpMRI) or PSMA PET alone could be used for boost volume definition. However, other studies proposed that the combined usage of both has the highest sensitivity in detection of intraprostatic lesions. The aim of this study was to demonstrate the feasibility and to evaluate the tumour control probability (TCP) and normal tissue complication probability (NTCP) of radiation therapy dose painting using 68 Ga-HBED-CC PSMA PET/CT, mpMRI or the combination of both in primary PCa...
May 2, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29699582/effects-of-megavoltage-computed-tomographic-scan-methodology-on-setup-verification-and-adaptive-dose-calculation-in-helical-tomotherapy
#17
Jian Zhu, Tong Bai, Jiabing Gu, Ziwen Sun, Yumei Wei, Baosheng Li, Yong Yin
BACKGROUND: To evaluate the effect of pretreatment megavoltage computed tomographic (MVCT) scan methodology on setup verification and adaptive dose calculation in helical TomoTherapy. METHODS: Both anthropomorphic heterogeneous chest and pelvic phantoms were planned with virtual targets by TomoTherapy Physicist Station and were scanned with TomoTherapy megavoltage image-guided radiotherapy (IGRT) system consisted of six groups of options: three different acquisition pitches (APs) of 'fine', 'normal' and 'coarse' were implemented by multiplying 2 different corresponding reconstruction intervals (RIs)...
April 27, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29699568/retraction-note-snps-in-genes-implicated-in-radiation-response-are-associated-with-radiotoxicity-and-evoke-roles-as-predictive-and-prognostic-biomarkers
#18
Ghazi Alsbeih, Medhat El-Sebaie, Najla Al-Harbi, Khaled Al-Hadyan, Mohamed Shoukri, Nasser Al-Rajhi
The authors are retracting this article [1] because the data have already been published in [2] making this a redundant publication. Ghazi Alsbeih, Najla Al-Harbi, Khaled Al-Hadyan, Mohamed Shoukri and Nasser Al-Rajhi agree with this retraction. Medhat El-Sebaie did not respond to our correspondence.
April 26, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29695284/dosimetric-feasibility-of-4dct-ventilation-imaging-guided-proton-therapy-for-locally-advanced-non-small-cell-lung-cancer
#19
Qijie Huang, Salma K Jabbour, Zhiyan Xiao, Ning Yue, Xiao Wang, Hongbin Cao, Yu Kuang, Yin Zhang, Ke Nie
BACKGROUND: The principle aim of this study is to incorporate 4DCT ventilation imaging into functional treatment planning that preserves high-functioning lung with both double scattering and scanning beam techniques in proton therapy. METHODS: Eight patients with locally advanced non-small-cell lung cancer were included in this study. Deformable image registration was performed for each patient on their planning 4DCTs and the resultant displacement vector field with Jacobian analysis was used to identify the high-, medium- and low-functional lung regions...
April 25, 2018: Radiation Oncology
https://www.readbyqxmd.com/read/29695273/stereotactic-body-radiotherapy-for-central-lung-tumors-yes-we-can
#20
Yasmin Korzets Ceder, Eyal Fenig, Aron Popvtzer, Nir Peled, Mordechai R Kramer, Milton Saute, Dima Bragilovsky, Tzippy Schochat, Aaron M Allen
BACKGROUND: SBRT is standard therapy for early stage lung cancer. Toxicity in central tumors has been a concern. RTOG 0813 showed that central SBRT is safe and effective. We report our experience with central SBRT. METHODS: We reviewed the records of patients treated with SBRT for central lung tumors (< 2 cm of the carina). Patients included primary lung cancer and recurrence following surgery and\ or conventional radiotherapy. All patients underwent 4DCT simulation and treatment planning was done with IMRT or VMAT techniques...
April 25, 2018: Radiation Oncology
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