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Proton beam therapy

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https://www.readbyqxmd.com/read/28727865/proton-beam-radiotherapy-and-concurrent-chemotherapy-for-unresectable-stage-iii-non-small-cell-lung-cancer-final-results-of-a-phase-2-study
#1
Joe Y Chang, Vivek Verma, Ming Li, Wencheng Zhang, Ritsuko Komaki, Charles Lu, Pamela K Allen, Zhongxing Liao, James Welsh, Steven H Lin, Daniel Gomez, Melenda Jeter, Michael O'Reilly, Ronald X Zhu, Xiaodong Zhang, Heng Li, Radhe Mohan, John V Heymach, Ara A Vaporciyan, Stephen Hahn, James D Cox
Importance: Proton beam radiotherapy (PBT) has the potential to reduce toxic effects in the definitive management of locally advanced non-small-cell lung cancer (NSCLC), but long-term prospective data are lacking. Objective: To report the final (5-year) results of a prospective study evaluating concurrent chemotherapy and high-dose PBT to treat unresectable stage III NSCLC. Design, Setting, and Participants: In this open-label, single-group assignment study, with median follow-up of 27...
July 20, 2017: JAMA Oncology
https://www.readbyqxmd.com/read/28721444/neovascular-glaucoma-after-proton-beam-therapy-of-choroidal-melanoma-incidence-and-risk-factors
#2
Aline I Riechardt, Daniel Pilger, Dino Cordini, Ira Seibel, Enken Gundlach, Annette Hager, Antonia M Joussen
PURPOSE: To analyze the risk factors for the development of neovascular glaucoma (NVG) of patients with choroidal melanoma after proton beam therapy (PBT). METHOD: Clinical case series, retrospective study. We evaluated 629 consecutive patients receiving proton beam therapy for the treatment of a choroidal melanoma at the oncology service at Charité, Berlin and Helmholtz-Zentrum, Berlin between 05/1998 and 11/2008 regarding the development and risk factors of NVG...
July 18, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28719019/initial-testing-of-a-pixelated-silicon-detector-prototype-in-proton-therapy
#3
Andrew J Wroe, Grant McAuley, Anthony V Teran, Jeannie Wong, Marco Petasecca, Michael Lerch, James M Slater, Anatoly B Rozenfeld
As technology continues to develop, external beam radiation therapy is being employed, with increased conformity, to treat smaller targets. As this occurs, the dosimetry methods and tools employed to quantify these fields for treatment also have to evolve to provide increased spatial resolution. The team at the University of Wollongong has developed a pixelated silicon detector prototype known as the dose magnifying glass (DMG) for real-time small-field metrology. This device has been tested in photon fields and IMRT...
July 18, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28716542/on-the-lateral-dose-profile-of-4-he-beams-in-water
#4
A Embriaco, V E Bellinzona, A Fontana, A Rotondi
PURPOSE: We investigate the possibility to improve the accuracy of the lateral dose profile for (4)He beams with a novel approach, by extending an already validated model for proton beams to heavier ions. METHODS: The full Molière theory for the Coulomb multiple scattering is applied to the case of (4)He beams, with a complete separation of the electromagnetic and of the nuclear contributions in the calculation of the total dose. The latter is described with only three free parameters...
July 14, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28713989/effects-of-proton-beam-irradiation-on-mitochondrial-biogenesis-in-a-human-colorectal-adenocarcinoma-cell-line
#5
Byung Geun Ha, Sung Suk Jung, Yun Hee Shon
Proton beam therapy has recently been used to improve local control of tumor growth and reduce side-effects by decreasing the global dose to normal tissue. However, the regulatory mechanisms underlying the physiological role of proton beam radiation are not well understood, and many studies are still being conducted regarding these mechanisms. To determine the effects of proton beams on mitochondrial biogenesis, we investigated: mitochondrial DNA (mtDNA) mass; the gene expression of mitochondrial transcription factors, functional regulators, and dynamic-related regulators; and the phosphorylation of the signaling molecules that participate in mitochondrial biogenesis...
July 5, 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/28704158/factors-associated-with-occurrence-of-radiation-induced-optic-neuropathy-at-safe-radiation-dosage
#6
Pavle Doroslovački, Madhura A Tamhankar, Grant T Liu, Kenneth S Shindler, Gui-Shuang Ying, Michelle Alonso-Basanta
BACKGROUND: Radiation-induced optic neuropathy (RION) is a rare, and often visually devastating, complication of radiation therapy (RT) near the anterior visual pathways. METHODS: A retrospective case series of patients who developed RION at a tertiary medical center, followed by a case-control study comparing RION cases with matched controls who received RT. RESULTS: Thirteen patients (18 eyes) with RION were identified. Radiation modalities included external beam photon radiation, whole brain radiation, stereotactic radiosurgery, proton beam, and unknown...
July 13, 2017: Seminars in Ophthalmology
https://www.readbyqxmd.com/read/28698447/-a-case-of-perianal-squamous-cell-carcinoma-with-left-inguinal-lymph-node-metastasis-that-showed-a-complete-response-more-than-five-years-after-chemotherapy-and-concomitant-proton-beam-therapy
#7
Nobuyasu Suzuki, Ayaka Azami, Yukitoshi Todate, Takeshi Tada, Mitsuru Waragai, Michitaka Honda, Atai Sato, Yoshinao Takano, Tsuyoshi Abe, Tatsuya Nakamura, Yasushi Teranishi
We report a case of perianal squamous cell carcinoma and left inguinal lymph node metastasis that showed a complete response more than 5 years after chemotherapy and concomitant proton beam therapy. A 34-year-old woman was referred to our hospital for an anal tumor and a left inguinal tumor. A digital rectal examination revealed a tumor in the anterior wall of the anal canal. In addition, the left inguinal lymph nodes were swollen, leading us to suspect metastases. Biopsy specimens confirmed poorly differentiated squamous cell carcinoma...
June 2017: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/28696514/modulation-of-lateral-positions-of-bragg-peaks-via-magnetic-fields-inside-cancer-patients-towards-magnetic-field-modulated-proton-therapy
#8
Wencheng Shao, Xiaobin Tang, Yanling Bai, Changran Geng, Diyun Shu, Chunhui Gong, Da Chen
PURPOSE: This work investigated whether the Bragg peak (BP) positions of proton beams can be modulated to produce uniform doses and cover a tumor under the magnetic fields inside cancer patients, and whether magnetic field modulated proton therapy (MMPT) is effective in vital organ protection. METHODS: The authors initially constructed an ideal water phantom comprising a central tumor surrounded by cuboid organ regions using GEANT4. Second, we designed the proton beams passing through the gap between two adjacent organ regions during beam configuration...
July 11, 2017: Medical Physics
https://www.readbyqxmd.com/read/28687574/successful-treatment-of-recurrent-primitive-myxoid-mesenchymal-tumor-of-infancy-with-bcor-internal-tandem-duplication
#9
Stuart L Cramer, Rong Li, Siraj Ali, Julie A Bradley, Hee K Kim, Joseph G Pressey
Primitive myxoid mesenchymal tumor of infancy (PMMTI) is a rare tumor with <20 cases reported to date. Recently PMMTI tumors have been found to harbor BCOR internal tandem duplication (ITD), the same genetic alteration detected in clear cell sarcoma of the kidney (CCSK). Complete surgical resection of PMMTI is often curative, but no standard of care has been established for unresectable tumors. We describe a female patient who presented at 13 months of age with a paraspinal mass and spinal cord compression...
July 2017: Journal of the National Comprehensive Cancer Network: JNCCN
https://www.readbyqxmd.com/read/28685076/follow-up-study-of-liver-metastasis-from-breast-cancer-treated-by-proton-beam-therapy
#10
Nobuyoshi Fukumitsu, Toshiyuki Okumura, Haruko Numajiri, Daichi Takizawa, Kayoko Ohnishi, Masashi Mizumoto, Teruhito Aihara, Hitoshi Ishikawa, Koji Tsuboi, Hideyuki Sakurai
Liver metastasis from breast cancer (LMBC) is an incurable, fatal disease with a very poor prognosis. Although various local treatments have been applied, their clinical utility has not been established. The purpose of this study was to investigate the safety and effectiveness of proton beam therapy (PBT) for the treatment of patients with LMGC. A total of 8 female patients (aged 38-63 years) with LMBC who received PBT between 2002 and 2012 were retrospectively reviewed. Patients who had tumors confined to the liver were investigated, whereas patients with extrahepatic tumors were excluded...
July 2017: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/28678434/prospective-study-of-proton-beam-radiation-therapy-for-limited-stage-small-cell-lung-cancer
#11
Jean-Claude M Rwigema, Vivek Verma, Liyong Lin, Abigail T Berman, William P Levin, Tracey L Evans, Charu Aggarwal, Ramesh Rengan, Corey Langer, Roger B Cohen, Charles B Simone
BACKGROUND: Existing data supporting the use of proton-beam therapy (PBT) for limited-stage small cell lung cancer (LS-SCLC) are limited to a single 6-patient case series. This is the first prospective study to evaluate clinical outcomes and toxicities of PBT for LS-SCLC. METHODS: This study prospectively analyzed patients with primary, nonrecurrent LS-SCLC definitively treated with PBT and concurrent chemotherapy from 2011 to 2016. Clinical backup intensity-modulated radiotherapy (IMRT) plans were generated for each patient and were compared with PBT plans...
July 5, 2017: Cancer
https://www.readbyqxmd.com/read/28675582/optimization-of-dual-energy-ct-acquisitions-for-proton-therapy-using-projection-based-decomposition
#12
Gloria Vilches-Freixas, Jean Michel Létang, Nicolas Ducros, Simon Rit
PURPOSE: Dual-energy computed tomography (DECT) has been presented as a valid alternative to single-energy CT to reduce the uncertainty of the conversion of patient CT numbers to proton stopping power ratio (SPR) of tissues relative to water. The aim of this work was to optimize DECT acquisition protocols from simulations of X-ray images for the treatment planning of proton therapy using a projection-based dual-energy decomposition algorithm. METHODS: We have investigated the effect of various voltages and tin filtration combinations on the SPR map accuracy and precision, and the influence of the dose allocation between the low energy (LE) and the high energy (HE) acquisitions...
July 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28675445/europium-155-as-a-source-for-dual-energy-cone-beam-computed-tomography-in-adaptive-proton-therapy-a-simulation-study
#13
Jiahua Zhu, Scott N Penfold
PURPOSE: To investigate the feasibility of a 3D imaging system utilizing a (155) Eu source and pixelated cadmium-zinc-telluride (CZT) detector for applications in adaptive radiotherapy. Specifically, to compare the reconstructed stopping power ratio (SPR) values of a head phantom obtained with the proposed imaging technique with theoretical SPR values. METHOD: A Geant4 Monte Carlo simulation was performed with the novel imaging system. The simulation was repeated with a typical 120 kV X-ray tube spectrum while maintaining all other parameters...
July 4, 2017: Medical Physics
https://www.readbyqxmd.com/read/28673358/difference-in-the-relative-biological-effectiveness-and-dna-damage-repair-processes-in-response-to-proton-beam-therapy-according-to-the-positions-of-the-spread-out-bragg-peak
#14
Hidehiro Hojo, Takeshi Dohmae, Kenji Hotta, Ryosuke Kohno, Atsushi Motegi, Atsushi Yagishita, Hideki Makinoshima, Katsuya Tsuchihara, Tetsuo Akimoto
BACKGROUND: Cellular responses to proton beam irradiation are not yet clearly understood, especially differences in the relative biological effectiveness (RBE) of high-energy proton beams depending on the position on the Spread-Out Bragg Peak (SOBP). Towards this end, we investigated the differences in the biological effect of a high-energy proton beam on the target cells placed at different positions on the SOBP, using two human esophageal cancer cell lines with differing radiosensitivities...
July 3, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28665491/feasibility-of-dynamic-adaptive-passive-scattering-proton-therapy-with-computed-tomography-image-guidance-in-the-lung
#15
Shunsuke Moriya, Hidenobu Tachibana, Kenji Hotta, Naoki Nakamura, Sakae Takeji, Tetsuo Akimoto
PURPOSE: Hypo-fractionated proton beam therapy (PBT) is an approach that has been increasingly explored over the past decade. It requires high geometric accuracy for targeting of the PBT beams. However, image-guided PBT is currently commonly performed with kV X-ray images of bony anatomy. A dynamic adaptive passive scattering PBT system using computed tomography-based three-dimensional image guidance was developed, and its effectiveness was then evaluated retrospectively in patients with non-small cell lung cancer (NSCLC)...
June 30, 2017: Medical Physics
https://www.readbyqxmd.com/read/28656604/consistency-in-quality-correction-factors-for-ionization-chamber-dosimetry-in-scanned-proton-beam-therapy
#16
Jefferson Sorriaux, Mauro Testa, Harald Paganetti, Damien Bertrand, John Aldo Lee, Hugo Palmans, Stefaan Vynckier, Edmond Sterpin
PURPOSE: The IAEA TRS-398 code of practice details the reference conditions for reference dosimetry of proton beams using ionization chambers and the required beam quality correction factors (kQ ). Pencil beam scanning (PBS) systems cannot approximate reference conditions using a single spot. However, dose distributions requested in TRS-398 can be reproduced with PBS using a combination of spots. This study aims to demonstrate, using Monte Carlo (MC) simulations, that kQ factors computed/measured for broad beams can be used with scanned beams for similar reference dose distributions with no additional significant uncertainty...
June 28, 2017: Medical Physics
https://www.readbyqxmd.com/read/28655455/attention-processing-speed-and-executive-functioning-in-pediatric-brain-tumor-survivors-treated-with-proton-beam-radiation-therapy
#17
Tanya N Antonini, M Douglas Ris, David R Grosshans, Anita Mahajan, M Fatih Okcu, Murali Chintagumpala, Arnold Paulino, Amanda E Child, Jessica Orobio, Heather H Stancel, Lisa S Kahalley
BACKGROUND AND PURPOSE: This study examines attention, processing speed, and executive functioning in pediatric brain tumor survivors treated with proton beam radiation therapy (PBRT). MATERIAL AND METHODS: We examined 39 survivors (age 6-19years) who were 3.61years post-PBRT on average. Craniospinal (CSI; n=21) and focal (n=18) subgroups were analyzed. Attention, processing speed, and executive functioning scores were compared to population norms, and clinical/demographic risk factors were examined...
June 24, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28650846/dosimetric-verification-in-water-of-a-monte-carlo-treatment-planning-tool-for-proton-helium-carbon-and-oxygen-ion-beams-at-the-heidelberg-ion-beam-therapy-center
#18
Thomas Tessonnier, Till Tobias Boehlen, Francesco Cerutti, Alfredo Ferrari, Paola Roberta Sala, Stephan Brons, Thomas Haberer, Juergen Debus, Katia Parodi, Andrea Mairani
The introduction of "new" ion species in particle therapy needs to be supported by a thorough assessment of their dosimetric properties and by treatment planning comparisons with clinically used proton and carbon ion beams. In addition to the latter two ions, helium and oxygen ion beams are foreseen at the Heidelberg Ion beam Therapy (HIT) center as potential assets for improving clinical outcomes in the near future. We present in this study a dosimetric validation of a FLUKA-based Monte Carlo Treatment Planning tool (MCTP) for protons, helium, carbon and oxygen ions for spread-out Bragg peaks...
June 26, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28649976/efficiency-of-analytical-and-sampling-based-uncertainty-propagation-in-intensity-modulated-proton-therapy
#19
N Wahl, P Hennig, H P Wieser, M Bangert
The sensitivity of intensity-modulated proton therapy (IMPT) treatment plans to uncertainties can be quantified and mitigated with robust/min-max and stochastic/probabilistic treatment analysis and optimization techniques. Those methods usually rely on sparse random, importance, or worst-case sampling. Inevitably, this imposes a trade-off between computational speed and accuracy of the uncertainty propagation. Here, we investigate analytical probabilistic modeling (APM) as an alternative for uncertainty propagation and minimization in IMPT that does not rely on scenario sampling...
June 26, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28647462/optical-coherence-tomography-angiography-of-macular-features-after-proton-beam-radiotherapy-for-small-choroidal-melanoma
#20
Alexandre Sellam, Florence Coscas, Livia Lumbroso-Le Rouic, Rémi Dendale, Marco Lupidi, Gabriel Coscas, Laurence Desjardins, Nathalie Cassoux
PURPOSE: To describe the macular features of patients treated with proton beam therapy for choroidal melanoma (CM), using the optical coherence tomography-angiography (OCTA). DESIGN: Retrospective case-control study. METHODS: This study included patients treated with proton beam radiotherapy (PBR) for a small CM. Only patients that had received 100% of the dose 60 GyEBR to the macular area were included in the analysis. All the patients have undergone a full ophthalmological examination including: visual acuity, OCT B-scan and OCTA...
June 21, 2017: American Journal of Ophthalmology
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