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Proton therapy

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https://www.readbyqxmd.com/read/29165619/comparison-of-response-of-passive-dosimetry-systems-in-scanning-proton-radiotherapy-a-study-using-paediatric-anthropomorphic-phantoms
#1
Ž Kneževic, I Ambrozova, C Domingo, M De Saint-Hubert, M Majer, I Martínez-Rovira, S Miljanic, N Mojzeszek, P Porwol, O Ploc, M Romero-Expósito, L Stolarczyk, S Trinkl, R M Harrison, P Olko
Proton beam therapy has advantages in comparison to conventional photon radiotherapy due to the physical properties of proton beams (e.g. sharp distal fall off, adjustable range and modulation). In proton therapy, there is the possibility of sparing healthy tissue close to the target volume. This is especially important when tumours are located next to critical organs and while treating cancer in paediatric patients. On the other hand, the interactions of protons with matter result in the production of secondary radiation, mostly neutrons and gamma radiation, which deposit their energy at a distance from the target...
November 18, 2017: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29163961/the-risk-of-clostridium-difficile-infection-in-patients-with-pernicious-anaemia-a-retrospective-cohort-study-using-primary-care-database
#2
Fatmah Othman, Colin J Crooks, Timothy R Card
Background: Studies have found an association between proton pump inhibitor (PPI) use and Clostridium difficile infection. The purpose of this study was to determine whether the mechanism by which PPIs induce an increased risk of C. difficile infection is supported by the same mechanism acting in another cause of achlorhydria, pernicious anaemia. Methods: Using a database of anonymised primary care records between 1990 and 2013, we selected exposed patients with a diagnosis of pernicious anaemia treated with vitamin B12 therapy...
November 2017: United European Gastroenterology Journal
https://www.readbyqxmd.com/read/29163155/intracellular-hyper-acidification-potentiated-by-hydrogen-sulfide-mediates-invasive-and-therapy-resistant-cancer-cell-death
#3
Zheng-Wei Lee, Xin-Yi Teo, Zhi J Song, Dawn S Nin, Wisna Novera, Bok A Choo, Brian W Dymock, Philip K Moore, Ruby Y-J Huang, Lih-Wen Deng
Slow and continuous release of H2S by GYY4137 has previously been demonstrated to kill cancer cells by increasing glycolysis and impairing anion exchanger and sodium/proton exchanger activity. This action is specific for cancer cells. The resulting lactate overproduction and defective pH homeostasis bring about intracellular acidification-induced cancer cell death. The present study investigated the potency of H2S released by GYY4137 against invasive and radio- as well as chemo-resistant cancers, known to be glycolytically active...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29162657/implementation-of-a-guideline-to-decrease-use-of-acid-suppressing-medications-in-the-nicu
#4
Asimenia Angelidou, Katherine Bell, Munish Gupta, Kristen Tropea Leeman, Anne Hansen
BACKGROUND AND OBJECTIVES: Acid-suppressing medications are used extensively in term and preterm newborns despite limited efficacy data and increasing evidence for potential harm. We sought to reduce nonindicated use of proton pump inhibitors (PPIs) and histamine-2 receptor antagonists (H2RAs) in our level III/IV NICU by developing and implementing a guideline for their use. Our specific aim was to reduce prescriptions among infants <1 month corrected age from a baseline of 7.5 to 4 per month by December 2016...
November 21, 2017: Pediatrics
https://www.readbyqxmd.com/read/29162279/clinical-decision-support-of-radiotherapy-treatment-planning-a-data-driven-machine-learning-strategy-for-patient-specific-dosimetric-decision-making
#5
Gilmer Valdes, Charles B Simone, Josephine Chen, Alexander Lin, Sue S Yom, Adam J Pattison, Colin M Carpenter, Timothy D Solberg
BACKGROUND AND PURPOSE: Clinical decision support systems are a growing class of tools with the potential to impact healthcare. This study investigates the construction of a decision support system through which clinicians can efficiently identify which previously approved historical treatment plans are achievable for a new patient to aid in selection of therapy. MATERIAL AND METHODS: Treatment data were collected for early-stage lung and postoperative oropharyngeal cancers treated using photon (lung and head and neck) and proton (head and neck) radiotherapy...
November 18, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29161458/proton-pump-inhibitors-for-functional-dyspepsia
#6
REVIEW
Maria Ines Pinto-Sanchez, Yuhong Yuan, Ahmed Hassan, Premysl Bercik, Paul Moayyedi
BACKGROUND: Functional dyspepsia (FD or non-ulcer dyspepsia) is defined as continuous or frequently recurring epigastric pain or discomfort for which no organic cause can be found. Acid suppressive therapy, including proton pump inhibitors (PPIs), has been proposed as a therapeutic option in FD, but its efficacy remains controversial. While PPIs are generally considered safe and well tolerated, they have been associated with adverse events, especially in the long term. For this reason, decisions on whether to initiate or continue PPI therapy should be made based on an appropriate clinical indication...
November 21, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29160775/anatomical-robust-optimization-to-account-for-nasal-cavity-filling-variation-during-intensity-modulated-proton-therapy-a-comparison-with-conventional-and-adaptive-planning-strategies
#7
Steven van de Water, Francesca Albertini, Damien Charles Weber, Ben J M Heijmen, Mischa S Hoogeman, Antony John Lomax
The aim of this study is to develop an anatomical robust optimization method for intensity-modulated proton therapy (IMPT) that accounts for interfraction variations in nasal cavity filling, and to compare it with conventional single-field uniform dose (SFUD) optimization and online plan adaptation. We included CT data of five patients with tumors in the sinonasal region. Using the planning CT, we generated for each patient 25 'synthetic' CTs with varying nasal cavity filling. The robust optimization method available in our treatment planning system 'Erasmus-iCycle' was extended to also account for anatomical uncertainties by including (synthetic) CTs with varying patient anatomy as error scenarios in the inverse optimization...
November 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29159915/performance-of-a-hybrid-monte-carlo-pencil-beam-dose-algorithm-for-proton-therapy-inverse-planning
#8
Ana María Barragán Montero, Kevin Souris, Daniel Sánchez Parcerisa, Edmond Sterpin, John Aldo Lee
PURPOSE: Analytical algorithms have a limited accuracy when modelling very heterogeneous tumor sites. This work addresses the performance of a hybrid dose optimizer that combines both Monte Carlo (MC) and pencil beam (PB) dose engines to get the best trade-off between speed and accuracy for proton therapy plans. METHODS: The hybrid algorithm calculates the optimal spot weights (w) by means of an iterative optimization process where the dose at each iteration is computed by using a precomputed dose influence matrix based on the conventional PB plus a correction term c obtained from a MC simulation...
November 21, 2017: Medical Physics
https://www.readbyqxmd.com/read/29159011/proton-therapy-for-malignant-pleural-mesothelioma-a-three-case-series-describing-the-clinical-and-dosimetric-advantages-of-proton-based-therapy
#9
Howard Lee, Jing Zeng, Stephen R Bowen, Ramesh Rengan
Malignant pleural mesothelioma (MPM) is a malignancy of the pleural cavity that typically presents at an advanced stage. Due to its large, circumferential clinical target volume (CTV) and proximity to major structures, including the heart and contralateral lung, delivering hemithoracic intensity-modulated radiotherapy (IMRT) with photon therapy to achieve loco-regional control following macroscopic complete resection is challenging. Intensity-modulated proton therapy (IMPT) has been shown to be a method for achieving higher therapeutic doses while limiting exposure to organs at risk (OARs), but patient outcomes after treatment have yet to be reported...
September 20, 2017: Curēus
https://www.readbyqxmd.com/read/29159005/field-specific-intensity-modulated-proton-therapy-optimization-technique-for-breast-cancer-patients-with-tissue-expanders-containing-metal-ports
#10
Maura Kirk, Gary Freedman, Thorsten Ostrander, Lei Dong
This report aims to propose and present an evaluation of a robust pencil beam scanning proton multi-field optimized treatment planning technique for postmastectomy radiation of breast cancer patients with implanted tissue expanders containing an internal metal port. Field-specific split targets were created for optimization to prevent spots from traveling through the metal port, while providing uniform coverage of the target with the use of a multi-field intensity modulated optimization approach. Two beam angles were strategically selected to provide complementary target coverage and plan robustness...
September 18, 2017: Curēus
https://www.readbyqxmd.com/read/29156467/-diagnosis-and-therapy-of-iris-lesions
#11
Joel M Mor, Konrad R Koch, Ludwig M Heindl
The most common iris lesions are iris nevi, iris melanomas and iris pigment epithelium cysts. However, there is an abundance of rare differential diagnoses that have to be considered, including other melanocytic and non-melanocytic lesions. Diagnostic tools include the slit lamp examination, gonioscopy, tonometry, transillumination, ultrasound biomicroscopy (UBM), optical coherence tomography, fluorescein angiography and standardized photography-assisted documentation. The timely identification of malignant lesions (i...
November 20, 2017: Klinische Monatsblätter Für Augenheilkunde
https://www.readbyqxmd.com/read/29152838/commissioning-of-the-world-s-first-compact-pencil-beam-scanning-proton-therapy-system
#12
Rajesh Pidikiti, Bijal C Patel, Matthew R Maynard, Joseph P Dugas, Joseph Syh, Narayan Sahoo, Hsinshun Terry Wu, Lane R Rosen
This paper summarizes clinical commissioning of the world's first commercial, clinically utilized installation of a compact, image-guided, pencil-beam scanning, intensity-modulated proton therapy system, the IBA Proteus(®) ONE, at the Willis-Knighton Cancer Center (WKCC) in Shreveport, LA. The Proteus(®) ONE is a single-room, compact-gantry system employing a cyclotron-generated proton beam with image guidance via cone-beam CT as well as stereoscopic orthogonal and oblique planar kV imaging. Coupling 220° of gantry rotation with a 6D robotic couch capable of in plane patient rotations of over 180° degrees allows for 360° of treatment access...
November 20, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29152444/excellent-pathologic-response-and-atypical-clinical-course-of-high-grade-extremity-sarcoma-to-neoadjuvant-pencil-beam-scanning-proton-therapy
#13
Jill Remick, William Regine, Robert Malyapa, Vincent Ng, Melissa Vyfhuis, Tejan Diwanji, Susan Shyu, James W Snider
Neoadjuvant radiation therapy, followed by definitive surgical resection, remains the standard of care for resectable high-grade and unresectable soft tissue sarcomas. Proton therapy offers the promise of highly conformal dose distributions with improved sparing of neighboring normal tissues as compared with conformal and intensity modulated photon techniques. It is unclear whether proton therapy may offer an improved tumoral response, especially with dose escalation, in this relatively radio-insensitive tumor type...
September 15, 2017: Curēus
https://www.readbyqxmd.com/read/29152442/combination-intensity-modulated-proton-therapy-and-passive-scatter-boost-for-rapidly-progressing-nasal-cavity-squamous-cell-carcinoma
#14
Sweet Ping Ng, Ethan B Ludmir, Manuel A Oyervides, Richard Y Wu, Steve Frank, G Brandon Gunn
Cancers of the nasal cavity and septum are associated with poor prognosis and are usually treated with surgery followed by post-operative radiotherapy with or without concurrent chemotherapy. Definitive radiotherapy is used in cases where the tumor is unresectable, patient is unfit for surgery, and/or the patient declines surgical intervention. Here, we present a case of a patient, who for non-medical reasons, opted to have non-surgical management of his rapidly progressing nasal cavity tumor. He was successfully treated with concurrent chemoradiotherapy utilizing a combination of intensity modulated proton therapy (IMPT) with passive scatter boost to reduce dose to the adjacent critical neural structures...
September 14, 2017: Curēus
https://www.readbyqxmd.com/read/29152431/intensity-modulated-proton-therapy-with-advanced-planning-techniques-in-a-challenging-hepatocellular-carcinoma-patient
#15
Smith Apisarnthanarax, Jatinder Saini, Avril O'Ryan-Blair, Jackie Castro, Stephen R Bowen
The use of radiation therapy has been increasing over recent years for the treatment of hepatocellular carcinoma (HCC). Proton beam therapy (PBT) has emerged as a promising treatment option for HCC patients due to its dosimetric advantages of sparing more normal liver tissue from radiation at low to moderate doses compared to photon-based treatments while still delivering high doses of radiation to tumors. The PBT therapy may be particularly beneficial in high-risk HCC cirrhotic patients with large, bulky tumors and/or vascular invasion complicated by surrounding perfusion abnormalities...
September 10, 2017: Curēus
https://www.readbyqxmd.com/read/29152430/a-dosimetric-comparison-of-intensity-modulated-proton-therapy-volumetric-modulated-arc-therapy-and-4%C3%AF-non-coplanar-intensity-modulated-radiation-therapy-for-a-patient-with-parameningeal-rhabdomyosarcoma
#16
Tiffany W Chen, Julian Sison, Becky Lee, Arthur J Olch, Andrew Chang, Annelise Giebeler, Kenneth Wong
Rhabdomyosarcoma (RMS) is the most common soft tissue sarcoma in children and manifests as two major histological subtypes: embryonal and alveolar. The five-year local failure rate for RMS at parameningeal sites (middle ear, mastoid region, nasal cavity, etc.) is around 17% despite multiple Intergroup Rhabdomyosarcoma Study Group (IRS) trials conducted to determine the optimal radiation treatment regimen. This case report explores the use of intensity-modulated proton therapy (IMPT) for a 10-year-old child who presented with left eye irritation, facial pain, and headaches and was found to have an alveolar parameningeal rhabdomyosarcoma...
September 10, 2017: Curēus
https://www.readbyqxmd.com/read/29152427/dramatic-response-of-a-large-sacral-chordoma-to-intensity-modulated-proton-beam-therapy
#17
Craig Schneider, Melissa Vyfhuis, Emily Morse, Tejan Diwanji, James W Snider, Sina Mossahebi, Katarina Steacy, Robert Malyapa
Sacral chordomas are slow-growing, indolent, and locally invasive tumors that typically present with pain and neurologic dysfunction. Wide en-bloc surgical excision is the primary treatment, but achieving adequate margins is difficult and surgery is often associated with significant morbidity. Adjuvant radiation therapy (RT) is utilized to decrease the risk of local recurrence or as definitive treatment for nonsurgical candidates. Although chordomas are considered to be relatively radioresistant tumors, several studies have demonstrated tumor response to high-dose proton therapy...
September 10, 2017: Curēus
https://www.readbyqxmd.com/read/29151478/low-incidence-of-esophageal-lesions-after-pulmonary-vein-isolation-using-contact-force-sensing-catheter-without-esophageal-temperature-probe
#18
Christian Blockhaus, Patrick Müller, Stephan Vom Dahl, Silke Leonhardt, Dieter Häussinger, Shqipe Gerguri, Lucas Clasen, Jan Schmidt, Muhammed Kurt, Christoph Brinkmeyer, Malte Kelm, Dong-In Shin, Hisaki Makimoto
Pulmonary vein isolation (PVI) is a cornerstone therapy for atrial fibrillation (AF). Although severe complications are rather rare, the development of an atrio-esophageal fistula (AEF) is a fatal complication with a very high mortality even after surgical treatment. The use of esophageal temperature probes (ETP) during PVI may protect the esophagus but it is still under debate since the ETP may also lead to esophageal lesions. The aim of this study was to evaluate the clinical safety of PVI using contact-force (CF) sensing catheter without esophageal temperature monitoring...
November 17, 2017: International Heart Journal
https://www.readbyqxmd.com/read/29149904/concomitant-sequential-and-7-day-triple-therapy-in-first-line-treatment-of-helicobacter-pylori-infection-in-korea-study-protocol-for-a-randomized-controlled-trial
#19
Hyuk Lee, Beom Jin Kim, Sang Gyun Kim, Jin Il Kim, Il Ju Choi, Yong Chan Lee, Jae G Kim, Jae J Kim
BACKGROUND: Most international guidelines recommend triple-therapy regimens consisting of a proton pump inhibitor, clarithromycin, and amoxicillin/metronidazole for at least 7 days for the eradication of Helicobacter pylori. However, the efficacy of 7-day clarithromycin-based standard triple therapy for H. pylori infection is currently unacceptable in Korea. In this study, we will compare the efficacy and safety of 7-day standard triple therapy, 10-day sequential therapy, and 10-day concomitant therapy for the first-line treatment of H...
November 17, 2017: Trials
https://www.readbyqxmd.com/read/29149379/efficacy-of-systemic-and-intratympanic-corticosteroid-combination-therapy-versus-intratympanic-or-systemic-therapy-in-patients-with-idiopathic-sudden-sensorineural-hearing-loss-a-randomized-controlled-trial
#20
Mohammadtaghi Khorsandi Ashtiani, Farzad Firouzi, Shahin Bastaninejad, Sasan Dabiri, Sevil Nasirmohtaram, Niloufar Saeedi, Hossein Ghazavi, Leyla Sahebi
OBJECTIVE: The present study was conducted to compare the rates of recovery from idiopathic sudden deafness after the treatment with oral and intratympanic corticosteroids in both mono and combination therapies. STUDY DESIGN: Triple-blind randomized clinical trial. SETTINGS: Tertiary referral hospital. SUBJECTS AND METHODS: A total of 112 patients who were admitted to the ENT emergency department randomly divided into three groups: an oral corticosteroid plus intratympanic placebo (systemic corticosteroid monotherapy group); an intratympanic corticosteroid plus oral placebo group (IT monotherapy group); and a combination therapy group (IT plus systemic combination group)...
November 17, 2017: European Archives of Oto-rhino-laryngology
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