PubMed Journals Articles About "Proton Radiation Brain Tumor" RSS

10:05 EST 15th December 2018 | BioPortfolio

Proton Radiation Brain Tumor PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Proton Radiation Brain Tumor articles that have been published worldwide.

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Showing "Proton Radiation Brain Tumor" PubMed Articles 1–25 of 18,000+

Radiation Induced Cerebral Microbleeds in Pediatric Patients with Brain Tumors Treated with Proton Radiotherapy.

Proton beam radiotherapy (PBT) has been increasingly utilized to treat pediatric brain tumors, however, limited information exists regarding radiation induced cerebral microbleeds (CMBs) among these patients. The purpose was to evaluate the incidence, risk factors, and imaging appearance of CMBs in pediatric patients with brain tumors treated with PBT.

Radiation-induced vascular malformations in the brain, mimicking tumor in MRI-based treatment response assessment maps (TRAMs).

•Of 310 brain tumors patients recruited, histology of 99 lesions was available.•Of those, 5 were histologically confirmed as radiation-induced malformations.•TRAMs cannot differentiate active tumor from vascular malformation.

Radiation and Brain Tumors: An Overview.

The use of radiation is an essential part of both modern cancer diagnostic assessment and treatment. Next-generation imaging devices create 3D visualizations, allowing for better diagnoses and improved planning of precision treatment. This is particularly important for primary brain cancers such as diffuse intrinsic pontine glioma or the most common primary brain tumor, glioblastoma, because radiotherapy is often the only treatment modality that offers a significant improvement in survival and quality of li...

Late Effects of Radiation Prime the Brain Microenvironment for Accelerated Tumor Growth.

Glioblastoma (GBM) remains incurable, despite state-of-the-art treatment involving surgical resection, chemotherapy, and radiation. GBM invariably recurs as a highly invasive and aggressive phenotype, with the majority of recurrences within the radiotherapy treatment field. While a large body of literature reporting on primary GBM exists, comprehensive studies of how prior irradiation alters recurrent tumor growth are lacking. An animal model that replicates the delayed effects of radiotherapy on the brain ...

Oxygen-guided radiation therapy.

It has been known for over a hundred years that tumor hypoxia, a near-universal characteristic of solid tumors, decreases the curative effectiveness of radiation therapy. However, to date, there are no reports that demonstrate an improvement in radiation effectiveness in a mammalian tumor based on tumor hypoxia localization and local hypoxia treatment.

Dose-volume metrics and their relation to memory performance in pediatric brain tumor patients: A preliminary study.

Advances in radiation treatment (RT), specifically volumetric planning with detailed dose and volumetric data for specific brain structures, have provided new opportunities to study neurobehavioral outcomes of RT in children treated for brain tumor. The present study examined the relationship between biophysical and physical dose metrics and neurocognitive ability, namely learning and memory, 2 years post-RT in pediatric brain tumor patients.

Radiation Exposure From Pediatric CT Scans and Subsequent Cancer Risk in the Netherlands.

Computed tomography (CT), a strong diagnostic tool, delivers higher radiation doses than most imaging modalities. As CT use has increased rapidly, radiation protection is important, particularly among children. We evaluate leukemia and brain tumor risk following exposure to low-dose ionizing radiation from CT scans in childhood.

Investigation of optimal physical parameters for precise proton irradiation of orthotopic tumors in small animals.

The lack of evidence of biomarkers identifying patients that would benefit from proton therapy has driven the emergence of preclinical proton irradiation platforms using advanced small-animal models to mimic clinical therapeutic conditions. This study aims to determine the optimal physical parameters of the proton beam with a high radiation targeting accuracy, since small-animal tumors can reach millimetric dimensions at a maximum depth of about 2 cm.

Imaging of Sodium MRI for Therapy Evaluation of Brain Metastase with Cyberknife at 7T: A Case Report.

Herein we describe the case of an elderly patient who presented with a recent history of impaired vision of the right eye around three months due to brain lesions. He was diagnosed with liver cancer and underwent surgery three months prior. The pathological result is hepatocellular carcinoma. Magnetic resonance imaging (MRI) revealed the diagnosis of brain to be metastatic. The patient selected CyberKnife (Accuray Incorporated, Sunnyvale, USA) radiosurgery for the brain lesion since his physical conditions...

Combination PD-1 blockade and irradiation of brain metastasis induces an effective abscopal effect in melanoma.

Nearly half of melanoma patients develop brain metastases during the course of their disease. Despite advances in both localized radiation and systemic immunotherapy, brain metastases remain difficult to treat, with most patients surviving less than 5 months from the time of diagnosis. While both treatment regimens have individually shown considerable promise in treating metastatic melanoma, there is interest in combining these strategies to take advantage of potential synergy. In order to study the abilit...

Towards a novel dosimetry system using acrylic disk radiation sensor for proton pencil beam scanning.

Fabricate an acrylic disk radiation sensor (ADRS) and characterize the photoluminescence signal generated from the optical device as basis for the development and evaluation of a new dosimetry system for pencil beam proton therapy.

A Quantitative Clinical Decision-support Strategy Identifying Which Oropharyngeal Head and Neck Cancer Patients may Benefit the Most from Proton Radiation Therapy.

Developing a quantitative decision-support strategy estimating the impact of normal tissue complications from definitive radiation therapy (RT) for head and neck cancer (HNC). We developed this strategy to identify oropharyngeal HNC patients that may benefit most from receiving proton RT.

Effects of ionizing radiation and HLY78 on the zebrafish embryonic developmental toxicity.

The health-related effects of ionizing radiation on embryonic development and their underlying mechanisms are still unclear. The aim of this study was to investigate the role of Wnt signaling in mediating the developmental toxicity induced by heavy ion and proton radiation using zebrafish embryos. Zebrafish embryos were radiated with carbon ions or protons. HLY78, an activator of the Wnt signaling pathway, was added immediately after radiation. Carbon ion radiation induced a significant increase of mortalit...

Differential Association Between Circulating Lymphocyte Populations With Outcome After Radiation Therapy in Subtypes of Liver Cancer.

Irradiation may have significant immunomodulatory effects that impact tumor response and could potentiate immunotherapeutic approaches. The purposes of this study were to prospectively investigate circulating lymphoid cell population fractions during hypofractionated proton therapy (HPT) in blood samples of liver cancer patients and to explore their association with survival.

Individual Response to Ionizing Radiation and Personalized Radiotherapy.

Radiation therapy remains one of the most effective cancer treatments. Nevertheless, biology-driven personalized radiation therapy that enables treatment according to the biological characteristics of the individual tumors and normal tissues still needs to be implemented in the clinic. Understanding the mechanisms of radiation response in both tumors and normal tissues is necessary to develop reliable predictive biomarkers for tumor radioresistance and normal tissue toxicity as well as to exploit new therap...

Potential Improvements in Brain Dose Estimates For Internal Emitters.

Element-specific biokinetic models are used to reconstruct doses to systemic tissues from internal emitters. Typically, a systemic model for a radionuclide explicitly depicts only its dominant repositories. Remaining tissues and fluids are aggregated into a pool called Other tissue in which the radionuclide is assumed to be uniformly distributed. In the systemic biokinetic models used in radiation protection, the brain usually is addressed as an implicit mass fraction of Other tissue rather than an explicit...

A roadmap for important centers of growth in the pediatric skeleton to consider during radiation therapy and associated clinical correlates of radiation-induced growth toxicity.

With the increasing use of advanced radiation techniques such as intensity modulated radiation therapy, stereotactic radiation therapy, and proton therapy, radiation oncologists now have the tools to mitigate radiation-associated toxicities. This is of utmost importance in the treatment of a pediatric patient. To best utilize these advanced techniques to mitigate radiation-induced growth abnormalities, the radiation oncologist should be equipped with a nuanced understanding of the anatomy of centers of grow...

Reducing X-ray imaging for proton postmastectomy chest wall patients.

Proton postmastectomy radiation therapy (PMRT) patients are positioned daily using surface imaging with additional x-ray imaging for confirmation. This study aims to investigate whether weekly x-ray imaging with daily surface imaging, as performed for photon treatment, is sufficient to maintain PMRT patient positioning fidelity.

Management of Brain Metastases in the New Era of Checkpoint Inhibition.

Brain metastasis is a common complication of advanced malignancies, especially, lung cancer, breast cancer, renal cell carcinoma, and melanoma. Traditionally surgery, when indicated, and radiation therapy, either as whole-brain radiation therapy or stereotactic radiosurgery, constituted the major treatment options for brain metastases. Until recently, most of the systemic chemotherapy agents had limited activity for brain metastases. However, with the advent of small molecule tyrosine kinase inhibitors and ...

Evaluating risk factors of radiation pneumonitis after stereotactic body radiation therapy in lung tumor: Meta-analysis of 9 observational studies.

In this study, we assessed the association of SBRT (stereotactic body radiotherapy) dose and volume with radiation pneumonitis (RP) risk in lung tumor.

Administration of dendritic cells and anti-PD-1 antibody converts X-ray irradiated tumors into effective in situ vaccines.

Danger signals and release of tumor-specific antigens after exposure to ionizing radiation can convert an irradiated tumor into an in situ vaccine. However, radiation alone is not sufficient to induce an effective systemic immune response. In this study, we investigated whether a combination of X-ray irradiation with bone marrow-derived dendritic cell (BM-DC) and anti-PD-1 antibody (αPD1-ab) administration can enhance both local tumor control and the systemic abscopal effect in murine subcutaneous tumor mo...

F-EF5 PET-based Imageable Hypoxia Predicts Local Recurrence in Tumors Treated With Highly Conformal Radiation Therapy.

Tumor hypoxia contributes to radiation resistance. A noninvasive assessment of tumor hypoxia would be valuable for prognostication and possibly selection for hypoxia-targeted therapies. F-pentafluorinated etanidazole (F-EF5) is a nitroimidazole derivative that has demonstrated promise as a positron emission tomography (PET) hypoxia imaging agent in preclinical and clinical studies. However, correlation of imageable hypoxia by F-EF5 PET with clinical outcomes after radiation therapy remains limited.

Beam shaping assembly design of Li(p,n)Be neutron source for boron neutron capture therapy of deep-seated tumor.

The development of a medical facility for boron neutron capture therapy at Budker Institute of Nuclear Physics is under way. The neutron source is based on a tandem accelerator with vacuum insulation and lithium target. The proposed accelerator is conceived to deliver a proton beam around 10 mA at 2.3 MeV proton beam. To deliver a therapeutic beam for treatment of deep-seated tumors a typical Beam Shaping Assembly (BSA) based on the source specifications has been explored. In this article, an optimized ...

The Promise of Proton Therapy for Central Nervous System Malignancies.

Radiation therapy plays a significant role in management of benign and malignant diseases of the central nervous system. Patients may be at risk of acute and late toxicity from radiation therapy due to dose deposition in critical normal structures. In contrast to conventional photon delivery techniques, proton therapy is characterized by Bragg peak dose deposition which results in decreased exit dose beyond the target and greater sparing of normal structure which may reduce the rate of late toxicities from ...

Evaluating cellularity and structural connectivity on whole brain slides using a custom-made digital pathology pipeline.

In brain research, the histopathological examination of coronar whole-brain slides provides important insights into spatial disease characteristics. Regarding brain tumor research, this enables visualization of tumor heterogeneity, infiltration patterns and the relationship with the surrounding brain parenchyma. The precise correlation between radiological imaging and post-mortem brains is of special interest.

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