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Radiobiology

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https://www.readbyqxmd.com/read/28917255/stereotactic-body-radiotherapy-for-primary-renal-cell-carcinoma-and-adrenal-metastases
#1
Gargi Kothari, Alexander V Louie, David Pryor, Ian Vela, Simon S Lo, Bin S Teh, Shankar Siva
The incidence of renal cell carcinoma (RCC) and metastatic adrenal lesions continues to rise and present evolving complexities in terms of management. Technical challenges in treatment delivery are compounded by the setting of an ageing patient population with multiple medical co-morbidities. While the standard of care treatment for both primary RCC and oligometastatic adrenal lesions has typically been surgery, a number of patients may be medically or surgically inoperable, and for whom alternative options require consideration...
September 2017: Chinese Clinical Oncology
https://www.readbyqxmd.com/read/28905672/the-influence-of-ketogenic-therapy-on-the-5-r-s-of-radiobiology
#2
Rainer J Klement
PURPOSE: Radiotherapy (RT) is a mainstay in the treatment of solid tumors and works by inducing free radical stress in tumor cells, leading to loss of reproductive integrity. The optimal treatment strategy has to consider damage to both tumor and normal cells and is determined by five factors known as the 5 R's of radiobiology: Reoxygenation, DNA Repair, Radiosensitivity, Redistribution in the cell cycle and Repopulation. The aim of this review is (i) to present evidence that these 5 R's are strongly influenced by cellular and whole body metabolism that in turn can be modified through ketogenic therapy in form of ketogenic diets and short term fasting, and (ii) to stimulate new research into this field including some research questions deserving further study...
September 14, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28885924/research-on-health-effects-of-low-level-ionizing-radiation-exposure-opportunities-for-the-armed-forces-radiobiology-research-institute
#3
(no author information available yet)
No abstract text is available yet for this article.
September 2017: Military Medicine
https://www.readbyqxmd.com/read/28874627/iort-in-breast-cancer-our-experience-of-the-first-patients-treated
#4
Andrea Morlino, Giuseppe La Torre, Loredana Lapadula, Aldo Cammarota
AIM: The aim of this study was to assess the therapeutic effect of intraoperative radiotherapy, describe the method and examine the results of our experience. BACKGROUND: Breast conserving therapy has recently become a standard treatment modality in patients with early invasive cancer. Radiotherapy, along with surgery, is an integral part of such treatment. The important thing of radiotherapy is to deliver a high dose to the tumour bed. One of the methods is the intraoperative radiotherapy...
2017: Annali Italiani di Chirurgia
https://www.readbyqxmd.com/read/28865514/mechanisms-of-normal-tissue-injury-from-irradiation
#5
REVIEW
Deborah E Citrin, James B Mitchell
Normal tissue injury from irradiation is an unfortunate consequence of radiotherapy. Technologic improvements have reduced the risk of normal tissue injury; however, toxicity causing treatment breaks or long-term side effects continues to occur in a subset of patients. The molecular events that lead to normal tissue injury are complex and span a variety of biologic processes, including oxidative stress, inflammation, depletion of injured cells, senescence, and elaboration of proinflammatory and profibrogenic cytokines...
October 2017: Seminars in Radiation Oncology
https://www.readbyqxmd.com/read/28863303/low-doses-and-non-targeted-effects-in-environmental-radiation-protection-where-are-we-now-and-where-should-we-go
#6
REVIEW
Carmel Mothersill, Andrej Rusin, Colin Seymour
The field of low dose radiobiology has advanced considerably in the last 30 years from small indications in the 1980's that all was not simple, to a paradigm shift which occurred during the 1990's, which severely dented the dose-driven models and DNA centric theories which had dominated until then. However while the science has evolved, the application of that science in environmental health protection has not. A reason for this appears to be the uncertainties regarding the shape of the low dose response curve, which lead regulators to adopt a precautionary approach to radiation protection...
August 29, 2017: Environmental Research
https://www.readbyqxmd.com/read/28862152/tumor-control-in-ion-beam-radiotherapy-with-different-ions-in-presence-of-hypoxia-an-oxygen-enhancement-ratio-model-based-on-the-microdosimetric-kinetic-model
#7
Lidia Strigari, Francesca Torriani, Lorenzo Manganaro, Taku Inaniwa, Federico Dalmasso, Roberto Cirio, Andrea Attili
Few attempts to include the oxygen enhancement ratio (OER) in treatment planning for ion beam therapy have been made and systematic studies to evaluate the impact of hypoxia in treatments with beam of different ion species are missing. The radiobiological models used to quantify the OER in such studies are mainly based on the dose-averaged LET estimates and do not explicitly distinguish between ion species and fractionation schemes. In this study a new OER modelling, based on the microdosimetric kinetic model, taking into account the specificity of the different ions, LET spectra, tissues and fractionation schemes, has been developed...
September 1, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28835182/proton-radiography-for-inline-treatment-planning-and-positioning-verification-of-small-animals
#8
Johannes Müller, Christian Neubert, Cläre von Neubeck, Michael Baumann, Mechthild Krause, Wolfgang Enghardt, Rebecca Bütof, Antje Dietrich, Armin Lühr
INTRODUCTION: As proton therapy becomes increasingly well established, there is a need for high-quality clinically relevant in vivo data to gain better insight into the radiobiological effects of proton irradiation on both healthy and tumor tissue. This requires the development of easily applicable setups that allow for efficient, fractionated, image-guided proton irradiation of small animals, the most widely used pre-clinical model. MATERIAL AND METHODS: Here, a method is proposed to perform dual-energy proton radiography for inline positioning verification and treatment planning...
August 23, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28830219/optimisation-of-radiotherapy-fractionation-schedules-based-on-radiobiological-functions
#9
Fernando Pizarro, Araceli Hernández
OBJECTIVE: To present a method for optimising radiotherapy fractionation schedules using radiobiological tools and taking into account the patient's dose-volume histograms (DVH). METHODS: This method uses a figure of merit based on the uncomplicated tumour control probability (P+) and the generalised equivalent uniform dose (gEUD). A set of doses per fraction is selected in order to find the dose per fraction and the total dose, thus maximising the figure of merit and leading to a biologically effective dose that is similar to the prescribed schedule...
August 22, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28828925/towards-ion-beam-therapy-based-on-laser-plasma-accelerators
#10
Leonhard Karsch, Elke Beyreuther, Wolfgang Enghardt, Malte Gotz, Umar Masood, Ulrich Schramm, Karl Zeil, Jörg Pawelke
Only few ten radiotherapy facilities worldwide provide ion beams, in spite of their physical advantage of better achievable tumor conformity of the dose compared to conventional photon beams. Since, mainly the large size and high costs hinder their wider spread, great efforts are ongoing to develop more compact ion therapy facilities. One promising approach for smaller facilities is the acceleration of ions on micrometre scale by high intensity lasers. Laser accelerators deliver pulsed beams with a low pulse repetition rate, but a high number of ions per pulse, broad energy spectra and high divergences...
August 22, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28827691/a-model-for-relative-biological-effectiveness-of-therapeutic-proton-beams-based-on-a-global-fit-of-cell-survival-data
#11
Ramin Abolfath, Christopher R Peeler, Mark Newpower, Lawrence Bronk, David Grosshans, Radhe Mohan
We introduce an approach for global fitting of the recently published high-throughput and high accuracy clonogenic cell-survival data for therapeutic scanned proton beams. Our fitting procedure accounts for the correlation between the cell-survival, the absorbed (physical) dose and the proton linear energy transfer (LET). The fitting polynomials and constraints have been constructed upon generalization of the microdosimetric kinetic model (gMKM) adapted to account for the low energy and high lineal-energy spectrum of the beam where the current radiobiological models may underestimate the reported relative biological effectiveness (RBE)...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28826292/radiobiological-issues-in-proton-therapy
#12
Radhe Mohan, Christopher R Peeler, Fada Guan, Lawrence Bronk, Wenhua Cao, David R Grosshans
The relative biological effectiveness (RBE) for particle therapy is a complex function of particle type, radiation dose, linear energy transfer (LET), cell type, endpoint, etc. In the clinical practice of proton therapy, the RBE is assumed to have a fixed value of 1.1. This assumption, along with the effects of physical uncertainties, may mean that the biologically effective dose distributions received by the patient may be significantly different from what is seen on treatment plans. This may contribute to unforeseen toxicities and/or failure to control the disease...
August 22, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28820311/clinical-radiobiology-of-proton-therapy-modeling-of-rbe
#13
B Jones
PURPOSE: To better estimate relative biological effectiveness (RBE) in therapeutic proton beams by using a modeled approach, in order to improve their clinical safety and effectiveness. INTRODUCTION: Concerns exist about the 1.1 RBE used in proton therapy, since it may lead to unintentional over- and under-dosage in patients and so lead to unexpected clinical outcomes. Late reacting normal tissues (with low α/β values), might be overdosed if RBE >1.1; very radiosensitive tumors (with high α/β), might be under-dosed if RBE <1...
August 18, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28816149/a-multi-institution-retrospective-analysis-of-cervix-intracavitary-brachytherapy-treatments-part-1-is-eqd2-good-enough-for-reporting-radiobiological-effects
#14
MULTICENTER STUDY
Emma C Fields, Rakhi Melvani, George Hajdok, David D'Souza, Bernard Jones, Kelly Stuhr, Quentin Diot, Christine M Fisher, Nitai Mukhopadhyay, Dorin Todor
PURPOSE: When brachytherapy doses are reported or added, biologically effective dose (BED) minimum dose covering 90% of the volume (D90) is used as if dose is delivered uniformly to the target. Unlike BED(D90), equivalent uniform BED (EUBED) and generalized biologically equivalent uniform dose (gBEUD) are quantities that integrate dose inhomogeneity. Here we compared BED(D90) and equivalent uniform BED (EUBED)/gBEUD in 3 settings: (1) 2 sites using tandem and ovoid (T&O) but different styles of implants; (2) 2 sites using different devices-T&O and tandem and ring (T&R)-and different styles; and (3) the same site using T&O and T&R with the same style...
September 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28806981/understanding-the-potentiality-of-accelerator-based-boron-neutron-capture-therapy-for-osteosarcoma-dosimetry-assessment-based-on-the-reported-clinical-experience
#15
Silva Bortolussi, Ian Postuma, Nicoletta Protti, Lucas Provenzano, Cinzia Ferrari, Laura Cansolino, Paolo Dionigi, Olimpio Galasso, Giorgio Gasparini, Saverio Altieri, Shin-Ichi Miyatake, Sara J González
BACKGROUND: Osteosarcoma is the most frequent primary malignant bone tumour, and its incidence is higher in children and adolescents, for whom it represents more than 10% of solid cancers. Despite the introduction of adjuvant and neo-adjuvant chemotherapy that markedly increased the success rate in the treatment, aggressive surgery is still needed and a considerable percentage of patients do not survive due to recurrences or early metastases. Boron Neutron Capture Therapy (BNCT), an experimental radiotherapy, was investigated as a treatment that could allow a less aggressive surgery by killing infiltrated tumour cells in the surrounding healthy tissues...
August 15, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28780694/dose-rate-effects-of-low-let-ionizing-radiation-on-fish-cells
#16
Nguyen T K Vo, Colin B Seymour, Carmel E Mothersill
Radiobiological responses of a highly clonogenic fish cell line, eelB, to low-LET ionizing radiation and effects of dose rates were studied. In acute exposure to 0.1-12 Gy of gamma rays, eelB's cell survival curve displayed a linear-quadratic (LQ) relationship. In the LQ model, α, β, and α/β ratio were 0.0024, 0.037, and 0.065, respectively; for the first time that these values were reported for fish cells. In the multi-target model, n, D o, and D q values were determined to be 4.42, 2.16, and 3.21 Gy, respectively, and were the smallest among fish cell lines being examined to date...
August 5, 2017: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/28771941/dosimetric-and-radiobiological-comparison-for-quality-assurance-of-imrt-and-vmat-plans
#17
Nava Raj Paudel, Ganesh Narayanasamy, Eun Young Han, Jose Penagaricano, Panayiotis Mavroidis, Xin Zhang, Anil Pyakuryal, Dongwook Kim, Xiaoying Liang, Steven Morrill
INTRODUCTION: The gamma analysis used for quality assurance of a complex radiotherapy plan examines the dosimetric equivalence between planned and measured dose distributions within some tolerance. This study explores whether the dosimetric difference is correlated with any radiobiological difference between delivered and planned dose. METHODS: VMAT or IMRT plans optimized for 14 cancer patients were calculated and delivered to a QA device. Measured dose was compared against planned dose using 2-D gamma analysis...
August 3, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28741896/therapeutic-analysis-of-intrabeam-based-intraoperative-radiation-therapy-in-the-treatment-of-unicentric-breast-cancer-lesions-utilizing-a-spherical-target-volume-model
#18
Madeline Schwid, Eric D Donnelly, Hualin Zhang
It is postulated that the outcomes in treating breast cancer with intraoperative radiotherapy (IORT) would be affected by the residual cancer cell distribution within the tumor bed. The three-dimensional (3D) radiation doses of Intrabeam(TM) (IB) IORT with a 4-cm spherical applicator at the energy of 50 and 40 kV were calculated. The modified linear quadratic model (MLQ) was used to estimate the radiobiological responses of the cancer cells and interspersed normal tissues with various radiosensitivities. By comparing the average survival fraction of normal tissues in IB-IORT and uniform dose treatment for the same level of cancer cell killing, the therapeutic ratios (TRs) were derived...
July 25, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28736809/dose-evaluation-of-grid-therapy-using-a-6-mv-flattening-filter-free-fff-photon-beam-a-monte-carlo-study
#19
Immaculada Martínez-Rovira, Josep Puxeu-Vaqué, Yolanda Prezado
PURPOSE: Spatially fractionated radiotherapy is a strategy to overcome the main limitation of radiotherapy, i.e., the restrained normal tissue tolerances. A well-known example is Grid Therapy, which is currently performed at some hospitals using megavoltage photon beams delivered by Linacs. Grid Therapy has been successfully used in the management of bulky abdominal tumors with low toxicity. The aim of this work was to evaluate whether an improvement in therapeutic index in Grid Therapy can be obtained by implementing it in a flattening filter-free (FFF) Linac...
July 24, 2017: Medical Physics
https://www.readbyqxmd.com/read/28735440/new-hypofractionation-radiation-strategies-for-glioblastoma
#20
REVIEW
Melissa Azoulay, Jennifer Shah, Erqi Pollom, Scott G Soltys
PURPOSE OF REVIEW: Glioblastoma (GBM) is the most common and lethal primary brain tumor in adults, with a median survival of less than 2 years despite the standard of care treatment of 6 weeks of chemoradiotherapy. We review the data investigating hypofractionated radiotherapy (HFRT) in the treatment of newly diagnosed GBM. RECENT FINDINGS: Investigators have explored alternative radiotherapy strategies that shorten treatment duration with the goal of similar or improved survival while minimizing toxicity...
September 2017: Current Oncology Reports
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