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https://www.readbyqxmd.com/read/28103615/radiation-induced-lung-metastasis-development-is-mt1-mmp-dependent-in-a-triple-negative-breast-cancer-mouse-model
#1
Gina Bouchard, Hélène Therriault, Sameh Geha, Rachel Bujold, Caroline Saucier, Benoit Paquette
BACKGROUND: The prognosis of triple-negative breast cancer (TNBC) is still difficult to establish. Some TNBC benefit from radiotherapy (RT) and are cured, while in other patients metastases appear during the first 3 years after treatment. In this study, an animal model of TNBC was used to determine whether the expression of the cell membrane protease MT1-MMP in cancer cells was associated with radiation-stimulated development of lung metastases. METHODS: Using invasion chambers, irradiated fibroblasts were used as chemoattractants to assess the invasiveness of TNBC D2A1 cell lines showing downregulated expression of MT1-MMP, which were compared with D2A1-wt (wild-type) and D2A1 shMT1-mock (empty vector) cell lines...
January 19, 2017: British Journal of Cancer
https://www.readbyqxmd.com/read/28103445/factors-influencing-radiation-treatment-recommendations-in-early-stage-merkel-cell-carcinoma-a-survey-of-us-based-radiation-oncologists
#2
Yolanda D Tseng, Smith Apisarnthanarax, Jay J Liao, Shailender Bhatia, Paul T Nghiem, Upendra Parvathaneni
OBJECTIVES: It is unclear which subgroups of Merkel cell carcinoma (MCC) patients benefit the most from radiation. We surveyed radiation oncologists (RO) that regularly see and treat MCC to understand how they approach the treatment of early-stage MCC. METHODS: A web-based survey was emailed to 63 ROs, who were identified through publications, guideline panel membership, and/or affiliation with institutions of high MCC volume. ROs provided treatment recommendations for two hypothetical case scenarios of early stage MCC...
January 19, 2017: Expert Review of Anticancer Therapy
https://www.readbyqxmd.com/read/28102958/sliding-window-prior-data-assisted-compressed-sensing-for-mri-tracking-of-lung-tumors
#3
Eugene Yip, Jihyun Yun, Keith Wachowicz, Zsolt Gabos, Satyapal Rathee, B G Fallone
PURPOSE: Hybrid magnetic resonance imaging and radiation therapy devices are capable of imaging in real-time to track intrafractional lung tumor motion during radiotherapy. Highly accelerated magnetic resonance (MR) imaging methods can potentially reduce system delay time and/or improves imaging spatial resolution, and provide flexibility in imaging parameters. Prior Data Assisted Compressed Sensing (PDACS) has previously been proposed as an acceleration method that combines the advantages of 2D compressed sensing and the KEYHOLE view-sharing technique...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102948/use-of-parallel-plate-ionization-chambers-in-reference-dosimetry-of-novac-and-liac-%C3%A2-mobile-electron-linear-accelerators-for-intraoperative-radiotherapy-a-multi-center-survey
#4
Paolo Scalchi, Alessia Ciccotelli, Giuseppe Felici, Assunta Petrucci, Raffaella Massafra, Valeria Piazzi, Paola D'Avenia, Francesca Cavagnetto, Federica Cattani, Raffaella Romagnoli, Antonella Soriani
PURPOSE: LIAC(®) and NOVAC are two mobile linear accelerators dedicated to intraoperative radiation therapy (IORT), generating electron beams in the energy range of 3-12 MeV. Due to high dose-per-pulse (up to 70 mGy per pulse), in 2003 the Italian National Institute of Health (ISS) stated that "for the measure of dose to water in reference conditions, ionization chambers cannot be employed and no published dosimetry protocol can be used". As a consequence, ferrous sulphate (or, alternatively alanine) dosimetry was recommended...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102943/comparison-of-five-cluster-validity-indices-performance-in-brain-18-f-fet-pet-image-segmentation-using-k-means
#5
Bedor Abualhaj, Guoyang Weng, Melissa Ong, Ali Asgar Attarwala, Flavia Molina, Karen Büsing, Gerhard Glatting
PURPOSE: Dynamic [(18) F]fluoro-ethyl-L-tyrosine positron emission tomography ([(18) F]FET-PET) is used to identify tumor lesions for radiotherapy treatment planning, to differentiate glioma recurrence from radiation necrosis and to classify gliomas grading. To segment different regions in the brain k-means cluster analysis can be used. The main disadvantage of k-means is that the number of clusters must be pre-defined. In this study, we therefore compared different cluster validity indices for automated and reproducible determination of the optimal number of clusters based on the dynamic PET data...
January 2017: Medical Physics
https://www.readbyqxmd.com/read/28102933/what-if-a-tumor-is-significantly-enlarged-just-before-stereotactic-body-radiation-therapy-a-case-report-and-review-of-the-literature
#6
Hung-Jen Chen, Ji-An Liang, Chih-Yi Chen, Yang-Hao Yu, Chun-Ru Chien
Stereotactic body radiation therapy (SBRT) plays an important role in early stage non-small cell lung cancer. Tumor growth before radiotherapy planning (RTP) or during SBRT has been reported in lung cancer patients; however, little is known of growth during the period in-between (i.e. after RTP but before SBRT). An 83-year-old man referred to our hospital and diagnosed with medically inoperable non-small cell lung cancer was noted to have significant tumor progression on day 1 of cone beam computed tomography just before the planned SBRT delivery...
November 18, 2016: Thoracic Cancer
https://www.readbyqxmd.com/read/28102436/-urethral-stricture-rate-after-prostate-cancer-radiotherapy-five-year-data-of-a-certified-prostate-cancer-center
#7
J Kranz, G Maurer, U Maurer, O Deserno, S Schulte, J Steffens
BACKGROUND: A urethral stricture is a scar of the urethral epithelium which can cause obstructive voiding dysfunction with consequential damage of the upper urinary tract. Almost 45% of all strictures are iatrogenic; they develop in 2-9% of patients after radical prostatectomy, but can also occur after prostate cancer radiotherapy. This study provides 5‑year data of a certified prostate cancer center (PKZ) in terms of urethral strictures. MATERIALS AND METHODS: Between 01/2008 and 12/2012 a total of 519 men were irradiated for prostate cancer (LDR and HDR brachytherapy as well as external beam radiation)...
January 19, 2017: Der Urologe. Ausg. A
https://www.readbyqxmd.com/read/28102237/tracking-of-mesenchymal-stem-cells-with-fluorescence-endomicroscopy-imaging-in-radiotherapy-induced-lung-injury
#8
Jessica R Perez, Norma Ybarra, Frederic Chagnon, Monica Serban, Sangkyu Lee, Jan Seuntjens, Olivier Lesur, Issam El Naqa
Mesenchymal stem cells (MSCs) have potential for reducing inflammation and promoting organ repair. However, limitations in available techniques to track them and assess this potential for lung repair have hindered their applicability. In this work, we proposed, implemented and evaluated the use of fluorescence endomicroscopy as a novel imaging tool to track MSCs in vivo. MSCs were fluorescently labeled and injected into a rat model of radiation-induced lung injury via endotracheal (ET) or intravascular (IV) administration...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28102003/intervention-quality-is-not-routinely-assessed-in-cochrane-systematic-reviews-of-radiation-therapy-interventions
#9
Mohamad R Abdul Rahim, Melissa L James, Brigid E Hickey
INTRODUCTION: The aim of this study was to maximise the benefits from clinical trials involving technological interventions such as radiation therapy. High compliance to the quality assurance protocols is crucial. We assessed whether the quality of radiation therapy intervention was evaluated in Cochrane systematic reviews. METHODS: We searched 416 published Cochrane systematic reviews and identified 67 Cochrane systematic reviews that investigated radiation therapy or radiotherapy as an intervention...
January 19, 2017: Journal of Medical Imaging and Radiation Oncology
https://www.readbyqxmd.com/read/28101834/management-of-acute-skin-toxicity-with-hypericum-perforatum-and-neem-oil-during-platinum-based-concurrent-chemo-radiation-in-head-and-neck-cancer-patients
#10
Pierfrancesco Franco, Monica Rampino, Oliviero Ostellino, Marina Schena, Giancarlo Pecorari, Paolo Garzino Demo, Massimo Fasolis, Francesca Arcadipane, Stefania Martini, Chiara Cavallin, Mario Airoldi, Umberto Ricardi
Acute skin toxicity is a frequent finding during combined radiotherapy and chemotherapy in head and neck cancer patients. Its timely and appropriate management is crucial for both oncological results and patient's global quality of life. We herein report clinical data on the use of Hypericum perforatum and neem oil in the treatment of acute skin toxicity during concurrent chemo-radiation for head and neck cancer. A consecutive series of 50 head and neck cancer patients undergoing concomitant radio-chemotherapy with weekly cisplatin was analyzed...
February 2017: Medical Oncology
https://www.readbyqxmd.com/read/28101240/downregulation-of-annexin-a1-is-correlated-with-radioresistance-in-nasopharyngeal-carcinoma
#11
Lifang Huang, Li Liao, Yanping Wan, Ailan Cheng, Meixiang Li, Sihan Chen, Maoyu Li, Xing Tan, Guqing Zeng
Radiotherapy is the primary treatment for nasopharyngeal carcinoma (NPC), but radioresistance often remains an obstacle to successful treatment. In our previous study, it was demonstrated that Annexin A1 (ANXA1) was involved in the p53-mediated radioresponse in NPC cells, which suggested that it may be associated with radioresistance in NPC; however, the role of ANXA1 in NPC radioresistance is unknown. In the present study, CNE2 cells were stably transfected with pLKO.1-ANXA1-small hairpin (sh)RNAs to investigate the effects of ANXA1 on the radiosensitivity of NPC...
December 2016: Oncology Letters
https://www.readbyqxmd.com/read/28100242/intraoperative-radiotherapy-in-gynaecological-and-genito-urinary-malignancies-focus-on-endometrial-cervical-renal-bladder-and-prostate-cancers
#12
REVIEW
Marco Krengli, Carla Pisani, Letizia Deantonio, Daniela Surico, Alessandro Volpe, Nicola Surico, Carlo Terrone
Intraoperative radiotherapy (IORT) refers to the delivery of a single radiation dose to a limited volume of tissue during a surgical procedure. A literature review was performed to analyze the role of IORT in gynaecological and genito-urinary cancer including endometrial, cervical, renal, bladder and prostate cancers.Literature search was performed by Pubmed and Scopus, using the words "intraoperative radiotherapy/IORT", "gynaecological cancer", "uterine/endometrial cancer", "cervical/cervix cancer", "renal/kidney cancer", "bladder cancer" and "prostate cancer"...
January 19, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28099939/type-5-phosphodiesterase-regulates-glioblastoma-multiforme-aggressiveness-and-clinical-outcome
#13
Valeriana Cesarini, Maurizio Martini, Lucia Ricci Vitiani, Giovanni Luca Gravina, Silvia Di Agostino, Grazia Graziani, Quintino Giorgio D'Alessandris, Roberto Pallini, Luigi M Larocca, Pellegrino Rossi, Emmanuele A Jannini, Susanna Dolci
Expression of type 5 phosphodiesterase (PDE5), a cGMP-specific hydrolytic enzyme, is frequently altered in human cancer, but its specific role in tumorigenesis remains controversial. Herein, by analyzing a cohort of 69 patients affected by glioblastoma multiforme (GBM) who underwent chemo- and radiotherapy after surgical resection of the tumor, we found that PDE5 was strongly expressed in cancer cells in about 50% of the patients. Retrospective analysis indicated that high PDE5 expression in GBM cells significantly correlated with longer overall survival of patients...
January 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/28099922/pafr-selectively-mediates-radioresistance-and-irradiation-induced-autophagy-suppression-in-prostate-cancer-cells
#14
Bing Yao, Bingqian Liu, Lei Shi, Xiang Li, Chuanchuan Ren, Mingbo Cai, Wen Wang, Jianhua Li, Yongde Sun, Yudong Wu, Jianguo Wen
Platelet-activating factor receptor (PAFR) promotes tumorigenesis, angiogenesis and metastasis. Here, we defined the PAFR as a yielding new inhibiting target to selectively enhance the sensitivity of prostate cancer (PCa) cells to radiation. The selective responding to PAFR inhibiter may be caused by the differential expression pattern of PAFR in PCa cells. In this study, we also determined PAFR as a molecular basis by which the radiation induces autophagy suppression independent of activating mTOR pathway...
January 14, 2017: Oncotarget
https://www.readbyqxmd.com/read/28099688/discerning-the-survival-advantage-among-patients-with-prostate-cancer-who-undergo-radical-prostatectomy-or-radiotherapy-the-limitations-of-cancer-registry-data
#15
Stephen B Williams, Jinhai Huo, Karim Chamie, Marc C Smaldone, Christopher D Kosarek, Justin E Fang, Leslie M Ynalvez, Simon P Kim, Karen E Hoffman, Sharon H Giordano, Brian F Chapin
BACKGROUND: The objective of this study was to compare the overall survival of patients who undergo radical prostatectomy or radiotherapy versus noncancer controls to discern whether there is a survival advantage according to prostate cancer treatment and the impact of selection bias on these results. METHODS: A matched cohort study was performed using the Surveillance, Epidemiology, and End Results (SEER)-Medicare-linked database. In total, 34,473 patients ages 66 to 75 years were identified who were without significant comorbidity, were diagnosed with localized prostate cancer, and received treatment treated with surgery or radiotherapy between 2004 and 2011...
January 18, 2017: Cancer
https://www.readbyqxmd.com/read/28097311/association-of-lymphovascular-space-invasion-with-locoregional-failure-and-survival-in-patients-with-node-negative-oral-tongue-cancers
#16
Richard J Cassidy, Jeffrey M Switchenko, Naresh Jegadeesh, Mutlay Sayan, Matthew J Ferris, Bree R Eaton, Kristin A Higgins, Jeffrey T Wadsworth, Kelly R Magliocca, Nabil F Saba, Jonathan J Beitler
Importance: The indications for adjuvant therapy in resected oral tongue cancers are based on both clinical and pathological factors, with clear evidence for adjuvant radiation in patients with pathologically positive neck lymph nodes, positive margins, and extracapsular extension, but the data for patients with no nodal disease are sparse. Objective: To investigate determinants of failure and survival in patients with node-negative oral tongue cancer. Design, Setting, and Participants: Medical records for patients with oral tongue cancer treated with definitive surgery from 2003 to 2013 were reviewed...
January 12, 2017: JAMA Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/28096917/assessment-of-histopathological-features-of-needle-biopsy-in-recurrent-prostate-cancer-following-salvage-high-intensity-focused-ultrasound
#17
Michele Billia, Khurram M Siddiqui, Susanne Chan, Fan Li, Ali Al-Zahrani, Jose A Gomez, Joseph L Chin
INTRODUCTION: Local recurrence of prostate cancer (PCa) following radiotherapy may be treated with curative intent using salvage high-intensity focused ultrasound (s-HIFU). The interpretation of needle core biopsy specimens following s-HIFU is a daunting task, even for experienced pathologists. We describe various histopathological features encountered in biopsy specimens following whole-gland s-HIFU in one of the largest descriptive studies to date. METHODS: Fifty-five patients with biopsy-proven localized radio-recurrent PCa underwent s-HIFU and transrectal ultrasound (TRUS)-guided prostatic needle biopsies at 180 days post-treatment...
November 2016: Canadian Urological Association Journal, Journal de L'Association des Urologues du Canada
https://www.readbyqxmd.com/read/28096199/trends-in-radiation-therapy-among-cancer-survivors-in-the-united-states-2000-2030
#18
Alex K Bryant, Matthew Banegas, Maria E Martinez, Loren K Mell, James D Murphy
BACKGROUND: Although the number of cancer survivors has increased substantially over the past several decades, the composition of survivors treated with radiotherapy is not well defined. Radiotherapy carries unique long-term toxicity risks for cancer survivors. This study describes the current estimates and future projections of the epidemiology of five-year cancer survivors who receive radiation therapy. METHODS: We used cancer incidence and survival data from the Surveillance, Epidemiology, and End-Results (SEER) database linked to US Census data to estimate the number of five-year cancer survivors treated with radiation between 2000 and 2030...
January 17, 2017: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/28095159/validation-and-modification-of-a-prediction-model-for-acute-cardiac-events-in-patients-with-breast-cancer-treated-with-radiotherapy-based-on-three-dimensional-dose-distributions-to-cardiac-substructures
#19
Veerle A B van den Bogaard, Bastiaan D P Ta, Arjen van der Schaaf, Angelique B Bouma, Astrid M H Middag, Enja J Bantema-Joppe, Lisanne V van Dijk, Femke B J van Dijk-Peters, Laurens A W Marteijn, Gertruida H de Bock, Johannes G M Burgerhof, Jourik A Gietema, Johannes A Langendijk, John H Maduro, Anne P G Crijns
Purpose A relationship between mean heart dose (MHD) and acute coronary event (ACE) rate was reported in a study of patients with breast cancer (BC). The main objective of our cohort study was to validate this relationship and investigate if other dose-distribution parameters are better predictors for ACEs than MHD. Patients and Methods The cohort consisted of 910 consecutive female patients with BC treated with radiotherapy (RT) after breast-conserving surgery. The primary end point was cumulative incidence of ACEs within 9 years of follow-up...
January 17, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28094849/the-collimator-monitoring-fill-factor-of-a-two-dimensional-detector-array-a-measure-of-its-ability-to-detect-collimation-errors
#20
Tenzin Sonam Stelljes, Hui Khee Looe, Dietrich Harder, Björn Poppe
PURPOSE: Two-dimensional detector arrays are routinely used for constancy checks and treatment plan verification in photon-beam radiotherapy. In addition to the spatial resolution of the dose profiles, the "coverage" of the radiation field with respect to the detection of any beam collimation deficiency appears as the second characteristic feature of a detector array. The here proposed "collimator monitoring fill factor" (CM fill factor) has been conceived to serve as a quantitative characteristic of this "coverage"...
January 17, 2017: Medical Physics
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