keyword
MENU ▼
Read by QxMD icon Read
search

Radiobiology

keyword
https://www.readbyqxmd.com/read/28820311/clinical-radiobiology-of-proton-therapy-modeling-of-rbe
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
Immaculada Martínez-Rovira, Josep Puxeu, 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 is 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
#8
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
https://www.readbyqxmd.com/read/28713681/the-use-of-tcp-based-eud-to-rank-and-compare-lung-radiotherapy-plans-in-silico-study-to-evaluate-the-correlation-between-tcp-with-physical-quality-indices
#9
Abdulhamid Chaikh, Jacques Balosso
BACKGROUND: To apply the equivalent uniform dose (EUD) radiobiological model to estimate the tumor control probability (TCP) scores for treatment plans using different radiobiological parameter settings, and to evaluate the correlation between TCP and physical quality indices of the treatment plans. METHODS: Ten radiotherapy treatment plans for lung cancer were generated. The dose distributions were calculated using anisotropic analytical algorithm (AAA). Dose parameters and quality indices derived from dose volume histograms (DVH) for target volumes were evaluated...
June 2017: Translational Lung Cancer Research
https://www.readbyqxmd.com/read/28712717/radiobiological-evaluation-of-prostate-cancer-imrt-and-conformal-rt-plans-using-different-treatment-protocols
#10
Panayiotis Mavroidis, Georgios Komisopoulos, Courtney Buckey, Margarita Mavroeidi, Gregory P Swanson, Dimos Baltas, Nikos Papanikolaou, Sotirios Stathakis
The purpose of this study is to evaluate the clinical efficacy of both step-and-shoot IMRT and 3D-Conformal Radiation Therapy modalities (CRT) in treating prostate cancer using radiobiological measures. Another aim was to estimate the risks for developing secondary malignancies in bladder and rectum due to radiotherapy from the corresponding modalities. The treatment plans of ten prostate cancer patients were developed using IMRT and CRT. For the IMRT plans, two beam energies and two treatment protocols were used (the RTOG 0415 and a most restrictive one proposed by Fox Chase Cancer Center (FCCC))...
July 13, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28712533/dose-volume-toxicity-modeling-for-de-intensified-chemo-radiation-therapy-for-hpv-positive-oropharynx-cancer
#11
Panayiotis Mavroidis, Alex Price, David Fried, Mark Kostich, Robert Amdur, William Mendenhall, Chihray Liu, Shiva Das, Lawrence B Marks, Bhishamjit Chera
BACKGROUND AND PURPOSE: The aim is to determine the radiobiological parameters of four popular normal tissue complication probability (NTCP) models that describe the dose-response relations of salivary glands and pharyngeal constrictors to the severity of patient reported xerostomia and dysphagia, respectively 6 and 12months post chemo-radiotherapy, furthermore, to evaluate the goodness-of-fit of the NTCP models for different combinations of glands and constrictors. MATERIAL AND METHODS: Forty-three patients were treated on a prospective multi-institutional phase II study (ClinicalTrials...
July 13, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28709028/in-vitro-investigation-of-the-dose-rate-effect-on-the-biological-effectiveness-of-megavoltage-x-ray-radiation-doses
#12
Sianne Oktaria, Michael L F Lerch, Anatoly B Rosenfeld, Moeava Tehei, Stéphanie Corde
Radiation therapy is rapidly evolving toward the delivery of higher dose rates to improve cancer treatment. In vitro experiments were performed to investigate the response of 9L and MCF-7 cancer cell lines, exposed to 10MV X-ray radiations. Up to 8Gy was delivered at a dose-rate of 50cGy/min compared to 5Gy/min. The data obtained emphasizes the importance of taking into account not only the physical, but also the radiobiological parameters, when planning a particular cancer treatment.
July 6, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28704557/monte-carlo-studies-on-neutron-interactions-in-radiobiological-experiments
#13
Mehrdad Shahmohammadi Beni, Tak Cheong Hau, D Krstic, D Nikezic, K N Yu
Monte Carlo method was used to study the characteristics of neutron interactions with cells underneath a water medium layer with varying thickness. The following results were obtained. (1) The fractions of neutron interaction with 1H, 12C, 14N and 16O nuclei in the cell layer were studied. The fraction with 1H increased with increasing medium thickness, while decreased for 12C, 14N and 16O nuclei. The bulges in the interaction fractions with 12C, 14N and 16O nuclei were explained by the resonance spikes in the interaction cross-section data...
2017: PloS One
https://www.readbyqxmd.com/read/28697853/inhibition-of-ataxia-telangiectasia-related-3-atr-improves-therapeutic-index-in-preclinical-models-of-non-small-cell-lung-cancer-nsclc-radiotherapy
#14
Victoria Dunne, Mihaela Ghita, Donna M Small, Caroline B M Coffey, Sinead Weldon, Clifford C Taggart, Sarah O Osman, Conor K McGarry, Kevin M Prise, Gerard G Hanna, Karl T Butterworth
BACKGROUND AND PURPOSE: To evaluate the impact of ATR inhibition using AZD6738 in combination with radiotherapy on the response of non-small cell lung cancer (NSCLC) tumour models and a murine model of radiation induced fibrosis. MATERIALS AND METHODS: AZD6738 was evaluated as a monotherapy and in combination with radiation in vitro and in vivo using A549 and H460 NSCLC models. Radiation induced pulmonary fibrosis was evaluated by cone beam computed tomography (CBCT) and histological staining...
July 8, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28686531/microenvironment-and-dose-delivery-dependent-response-after-exposure-to-ionizing-radiation-in-human-colorectal-cancer-cell-lines
#15
Vaidotas Stankevicius, Gintautas Vasauskas, Ryte Rynkeviciene, Jonas Venius, Vita Pasukoniene, Eduardas Aleknaviciusa, Kestutis Suziedelisa
A significant body of knowledge about radiobiology is based on studies of single dose cellular irradiation, despite the fact that conventional clinical applications using dose fractionation. In addition, cellular radiation response strongly depends on cell-cell and cell-extracellular matrix (ECM) interactions, which are poorly established in cancer cells grown under standard 2D cell culture conditions. In this study, we investigated the response of human colorectal carcinoma (CRC) DLD1 and HT29 cell lines, bearing distinct p53 mutations, to a single 2 or 10 Gy dose or fractionated 5 × 2 Gy doses of radiation using global transcriptomics analysis...
July 7, 2017: Radiation Research
https://www.readbyqxmd.com/read/28681150/predicting-patient-specific-radiotherapy-protocols-based-on-mathematical-model-choice-for-proliferation-saturation-index
#16
Jan Poleszczuk, Rachel Walker, Eduardo G Moros, Kujtim Latifi, Jimmy J Caudell, Heiko Enderling
Radiation is commonly used in cancer treatment. Over 50% of all cancer patients will undergo radiotherapy (RT) as part of cancer care. Scientific advances in RT have primarily focused on the physical characteristics of treatment including beam quality and delivery. Only recently have inroads been made into utilizing tumor biology and radiobiology to design more appropriate RT protocols. Tumors are composites of proliferating and growth-arrested cells, and overall response depends on their respective proportions at irradiation...
July 5, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28657906/radiogenomics-and-radiotherapy-response-modeling
#17
Issam El Naqa, Sarah L Kerns, James Coates, Yi Luo, Corey Speers, Catharine M L West, Barry S Rosenstein, Randall K Ten Haken
Advances in patient-specific information and biotechnology have contributed to a new era of computational medicine. Radiogenomics has emerged as a new field that investigates the role of genetics in treatment response to radiation therapy. Radiation oncology is currently attempting to embrace these recent advances and add to its rich history by maintaining its prominent role as a quantitative leader in oncologic response modeling. Here, we provide an overview of radiogenomics starting with genotyping, data aggregation, and application of different modeling approaches based on modifying traditional radiobiological methods or application of advanced machine learning techniques...
August 1, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28644558/current-understanding-of-cancer-stem-cells-review-of-their-radiobiology-and-role-in-head-and-neck-cancers
#18
REVIEW
Paul Ambrose Reid, Puthenparampil Wilson, Yanrui Li, Loredana Gabriela Marcu, Eva Bezak
Evidence of cancer cells that bear attributes analogous to those of normal stem cells has developed a hierarchical model of cancer's architecture and progression. This subset of cancer stem cells (CSCs) drives the progression and therapy resistance of cancers. Research to identify the phenotypes of these CSCs presents evidence of a subpopulation that is more resistant to therapy and may proliferate in response. Literature shows that CSCs typically represent around 1%-10% of cell populations in head and neck cancer but this proportion may increase in response to a therapeutic radiation dose...
September 2017: Head & Neck
https://www.readbyqxmd.com/read/28621586/the-cooler-code-a-novel-analytical-approach-to-calculate-subcellular-energy-deposition-by-internal-electron-emitters
#19
Mattia Siragusa, Giorgio Baiocco, Pil M Fredericia, Werner Friedland, Torsten Groesser, Andrea Ottolenghi, Mikael Jensen
COmputation Of Local Electron Release (COOLER), a software program has been designed for dosimetry assessment at the cellular/subcellular scale, with a given distribution of administered low-energy electron-emitting radionuclides in cellular compartments, which remains a critical step in risk/benefit analysis for advancements in internal radiotherapy. The software is intended to overcome the main limitations of the medical internal radiation dose (MIRD) formalism for calculations of cellular S-values (i.e., dose to a target region in the cell per decay in a given source region), namely, the use of the continuous slowing down approximation (CSDA) and the assumption of a spherical cell geometry...
August 2017: Radiation Research
https://www.readbyqxmd.com/read/28621265/improving-radiotherapy-in-cancer-treatment-promises-and-challenges
#20
REVIEW
Helen H W Chen, Macus Tien Kuo
Effective radiotherapy for cancer has relied on the promise of maximally eradicating tumor cells while minimally killing normal cells. Technological advancement has provided state-of-the-art instrumentation that enables delivery of radiotherapy with great precision to tumor lesions with substantial reduced injury to normal tissues. Moreover, better understanding of radiobiology, particularly the mechanisms of radiation sensitivity and resistance in tumor lesions and toxicity in normal tissues, has improved the treatment efficacy of radiotherapy...
June 8, 2017: Oncotarget
keyword
keyword
49909
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"