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https://www.readbyqxmd.com/read/29792309/metabolic-and-physiologic-imaging-biomarkers-of-the-tumor-microenvironment-predict-treatment-outcome-with-radiation-or-a-hypoxia-activated-prodrug-in-mice
#1
Shingo Matsumoto, Shun Kishimoto, Keita Saito, Yoichi Takakusagi, Jeeva P Munasinghe, Nallathamby Devasahayam, Charles Hart, Robert J Gillies, James B Mitchell, Murali C Krishna
Pancreatic ductal adenocarcinoma (PDAC) is characterized by hypoxic niches that lead to treatment resistance. Therefore, studies of tumor oxygenation and metabolic profiling should contribute to improved treatment strategies. Here we define two imaging biomarkers that predict differences in tumor response to therapy: 1) partial oxygen pressure (pO2), measured by EPR imaging; and 2) [1-13C] pyruvate metabolism rate, measured by hyperpolarized 13C MRI. Three human PDAC xenografts with varying treatment sensitivity (Hs766t, MiaPaCa-2, and Su...
May 23, 2018: Cancer Research
https://www.readbyqxmd.com/read/29791505/rapid-direct-aperture-optimization-via-dose-influence-matrix-based-piecewise-aperture-dose-model
#2
Xuejiao Zeng, Hao Gao, Xunbin Wei
In the traditional two-step procedure used in intensity-modulated radiation therapy, fluence map optimization (FMO) is performed first, followed by use of a leaf sequencing algorithm (LSA). By contrast, direct aperture optimization (DAO) directly optimizes aperture leaf positions and weights. However, dose calculation using the Monte Carlo (MC) method for DAO is often time-consuming. Therefore, a rapid DAO (RDAO) algorithm is proposed that uses a dose influence matrix based piecewise aperture dose model (DIM-PADM)...
2018: PloS One
https://www.readbyqxmd.com/read/29790995/late-radiological-changes-after-passive-scattering-proton-beam-therapy-for-stage-i-lung-cancer
#3
Naoki Nakamura, Hidehiro Hojo, Kazuya Inoue, Kenji Hotta, Sadamoto Zenda, Hiromi Baba, Masakatsu Onozawa, Atsushi Motegi, Masaki Nakamura, Yuichi Kibe, Tetsuo Akimoto
This study aimed to examine late radiological changes after proton beam therapy (PBT) for early-stage non-small cell lung cancer (NSCLC) and to clarify correlations between mass-like radiological changes and patient characteristics. CT scans of patients who underwent passive scattering PBT for T1-2N0M0 NSCLC were analyzed retrospectively. Patients were considered eligible if follow-up CT was performed for at least 2 years, with no definite evidence of local recurrence. The following five periods were defined: (i) 6-12 months, (ii) 12-24 months, (iii) 24-36 months, (iv) 36-48 months and (v) 48-60 months after PBT...
May 21, 2018: Journal of Radiation Research
https://www.readbyqxmd.com/read/29790859/neutron-track-length-estimator-for-gate-monte-carlo-dose-calculation-in-radiotherapy
#4
Halima Elazhar, Thomas Deschler, Jean Michel Letang, Abdelmjid Nourreddine, Nicolas Arbor
The out-of-field dose in radiation therapy is a growing concern in regards to the late side-effects and secondary cancer induction. In high-energy X-ray therapy, the secondary neutrons generated through photonuclear reactions in the accelerator are part of this secondary dose. The neutron dose is currently not estimated by the treatment planning system (TPS) while it appears to be preponderant for distances greater than 50~cm from the isocenter. Monte Carlo (MC) simulation has become the gold standard for accurately calculating the neutron dose under specific treatment conditions but the method is also known for having a slow statistical convergence, which makes it difficult to be used on a clinical basis...
May 23, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29790672/prognostic-significance-of-combined-pretreatment-lymphocyte-counts-and-body-mass-index-in-patients-with-head-and-neck-cancer-treated-with-radiation-therapy
#5
Yao-Yu Wu, Kai-Ping Chang, Chien-Yu Lin, Ping-Ching Pai, Hung-Ming Wang, Cheng-Lung Hsu, Chun-Ta Liao, Tzu-Chen Yen, Tuan-Jen Fang, Shiang-Fu Huang, Chung-Jan Kang, Ku-Hao Fang, Wan-Ni Lin, Yu-Chien Wang, Li-Jen Hsin, Ngan-Ming Tsang
We aimed to investigate the prognostic significance of combined pretreatment lymphocyte counts (LCs) and body mass index (BMI) in patients with head and neck cancer (HNC) treated with radiation therapy (RT). Nine hundred and twelve patients with HNC who were treated with RT were retrospectively reviewed. Survival was analyzed by stratifying the patients according to pretreatment LCs and BMI. Patients with low pretreatment LCs and BMI were characterized by a more advanced T stage, fewer nasopharyngeal subsites, less smoking and drinking, and fewer comorbidities...
May 23, 2018: Cancer Medicine
https://www.readbyqxmd.com/read/29790314/superselective-intraarterial-cerebral-infusion-of-cetuximab-with-blood-brain-barrier-disruption-combined-with-stupp-protocol-for-newly-diagnosed-glioblastoma
#6
Kay O Kulason, Julia R Schneider, Shamik Chakraborty, Christopher G Filippi, Bidyut Pramanik, Tamika Wong, Sherese Fralin, Karissa Tan, Ashley Ray, Rachel A Alter, Rafael Ortiz, Alexis Demopoulos, David J Langer, John A Boockvar
We describe the first case of a novel treatment for a newly diagnosed glioblastoma (GBM) using superselective intraarterial cerebral infusion (SIACI) of cetuximab after osmotic disruption of the blood-brain barrier (BBB) with mannitol. A 51year-old female underwent craniotomy for removal of a right frontal GBM. Pathology confirmed EGFR amplification, and she underwent three treatments of SIACI of cetuximab to the tumor site. The first treatment was given within a week of starting standard of care chemoradiation (Stupp protocol), which is a combination of radiation treatment (2 Gy per/ day x 30 days, total of 60 Gy) and oral temozolomide (75 mg/m2 )...
May 2018: Journal of Experimental Therapeutics & Oncology
https://www.readbyqxmd.com/read/29790179/merkel-cell-carcinoma-clinical-outcome-and-prognostic-factors-in-351-patients
#7
Linde M van Veenendaal, Alexander C J van Akkooi, Cees Verhoef, Dirk Jan Grünhagen, W Martin C Klop, Gerlof D Valk, Margot E T Tesselaar
BACKGROUND: Merkel cell carcinoma (MCC) is a rare and aggressive neuroendocrine carcinoma of the skin. AIM: To describe clinical outcome and prognostic factors of MCC patients in two expert-centers. METHOD: Patients with histologically confirmed MCC in 1990-2014 were included. Data on patient, tumor characteristics and treatment were retrospectively collected. RESULTS: A total of 351 Patients were evaluated, 153 (44%) males, median age 74 years (range 28-94)...
May 22, 2018: Journal of Surgical Oncology
https://www.readbyqxmd.com/read/29789896/an-offline-technique-to-evaluate-residual-motion-of-the-diaphragm-during-deep-inspiratory-breath-hold-from-cone-beam-ct-datasets
#8
Manuel Blessing, Julian Hofmann, Lena Vogel, Judit Boda-Heggemann, Frank Lohr, Frederik Wenz, Florian Stieler, Anna Simeonova-Chergou
PURPOSE: In radiation therapy, the computer-assisted deep inspiration breath-hold (DIBH) technique is one approach to deal with respiratory motion of tumors in the lung, liver, or upper abdomen. However, inter- and intra-breath-hold deviations from an optimal static tumor position might occur. A novel method is presented to noninvasively measure the diaphragm position and thus estimate its residual deviation (as surrogate for the tumor position) based on cone-beam computed tomography (CBCT) projection data using active breathing control during acquisition...
May 22, 2018: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/29789815/challenging-case-robot-assisted-laparoscopic-prostatectomy-after-prior-suprapubic-open-prostatectomy
#9
Shirin Razdan, Sanjay Razdan
Introduction: Given the ubiquity of robot-assisted laparoscopic prostatectomy (RALP) for treatment of localized prostate cancer, more surgeons are encountering challenging cases, either secondary to difficult anatomy, prior abdominal surgery, or prior radiation therapy. Our case is of RALP in a patient after prior suprapubic prostatectomy. Case Presentation: A 61-year-old otherwise healthy Hispanic gentleman presented for consultation after being found to have Gleason 4 + 4 = 8 prostate cancer on transrectal ultrasound-guided biopsy by an outside provider in July 2017...
2018: Journal of Endourology Case Reports
https://www.readbyqxmd.com/read/29789556/foxm1-dependent-rad51-and-brca2-signaling-protects-idiopathic-pulmonary-fibrosis-fibroblasts-from-radiation-induced-cell-death
#10
Jintaek Im, Jessica Lawrence, Davis Seelig, Richard S Nho
Radiation therapy is critical for the control of many tumors and lung is an important dose-limiting organ that impacts radiation dose prescribed to avoid irreversible pulmonary fibrosis in cancer survivors. Idiopathic pulmonary fibrosis (IPF) is a chronic, irreversible lung disease caused by aberrantly activated lung (myo)fibroblasts. The presence of pro-fibrotic, apoptosis-resistant fibroblasts in IPF promotes progressive fibrosis and may have a role in other diseases, if these resistant cells are selected for as a consequence of treatment...
May 22, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29789530/efficient-blood-brain-barrier-opening-in-primates-with-neuronavigation-guided-ultrasound-and-real-time-acoustic-mapping
#11
Shih-Ying Wu, Christian Aurup, Carlos Sierra Sanchez, Julien Grondin, Wenlan Zheng, Hermes Kamimura, Vincent P Ferrera, Elisa E Konofagou
Brain diseases including neurological disorders and tumors remain under treated due to the challenge to access the brain, and blood-brain barrier (BBB) restricting drug delivery which, also profoundly limits the development of pharmacological treatment. Focused ultrasound (FUS) with microbubbles is the sole method to open the BBB noninvasively, locally, and transiently and facilitate drug delivery, while translation to the clinic is challenging due to long procedure, targeting limitations, or invasiveness of current systems...
May 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29788491/lowering-the-recurrence-rate-in-pigmented-villonodular-synovitis-a-series-of-120-resections
#12
Carl Ferdinand Capellen, Reinhold Tiling, Alexander Klein, Andrea Baur-Melnyk, Thomas Knösel, Christof Birkenmaier, Falk Roeder, Volkmar Jansson, Hans Roland Dürr
Objectives: Tenosynovial giant-cell tumour or pigmented villonodular synovitis is an aggressive synovial proliferative disease, with the knee joint being the most commonly affected joint. The mainstay of therapy is surgical resection. The aim of this study was to evaluate the main patient characteristics, treatment and outcomes in a large single-centre retrospective study, focusing on meticulous aggressive open surgical procedures. Methods: From 1996 through 2014, 122 surgical interventions were performed in 105 patients...
May 16, 2018: Rheumatology
https://www.readbyqxmd.com/read/29788392/prognostic-accuracy-of-different-lymph-node-staging-systems-in-rectal-adenocarcinoma-with-or-without-preoperative-radiation-therapy
#13
Feng Shen, Junhui Cui, Ke Cai, Haiqiang Pan, Heqi Bu, Feng Yu
Background and objective: A variety of different lymph node (LN) staging systems have been developed to describe the lymph node status accurately. We aim to compare the prognostic accuracy of American Joint Committee on Cancer seventh N stage relative to negative number of lymph node (nLN), lymph node ratio (LNR) and log odds of metastatic lymph nodes (LODDS) in rectal adenocarcinoma (RC). Methods: A total of 19 167 Stage II-III rectal cancer patients who underwent surgical resection of rectal adenocarcinoma were identified from Surveillance, Epidemiology and End Results database...
May 19, 2018: Japanese Journal of Clinical Oncology
https://www.readbyqxmd.com/read/29788217/treatment-free-survival-in-patients-with-differentiated-thyroid-cancer
#14
Mousumi Banerjee, David Reyes-Gastelum, Megan R Haymart
Purpose: Cancer recurrence is a primary concern for patients with differentiated thyroid cancer; however, population-level data on recurrent or persistent disease does not currently exist. The objective of this study was to determine treated recurrent or persistent thyroid cancer using a population-based registry, identify correlates of poor treatment-free survival, and define prognostic groups for treatment-free survival. Methods: In this population-based study, we evaluated treatment-free survival in 9,273 patients from Surveillance, Epidemiology and End Results Program - Medicare diagnosed with differentiated thyroid cancer between 1998 and 2012...
May 16, 2018: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29788028/atypical-teratoid-rhabdoid-tumor-of-the-spinal-cord-in-a-child-case-report-and-comprehensive-review-of-the-literature
#15
Mohammed Babgi, Alaa Samkari, Abeer Al-Mehdar, Shaker Abdullah
INTRODUCTION: Atypical teratoid/rhabdoid tumor (AT/RT) of the central nervous system is characterized by SMARCB1/INI deletion or mutation in the long arm of chromosome 22 11(22q11.2), also resulting in loss of nuclear expression of INI1 protein immunohistochemically. AT/RT tumors usually occur in children below 3 years. The tumor is usually seen in the cerebellum or the cerebrum, with an extremely rare incidence in the spinal cord. MATERIALS AND METHODS: We report a rare case of AT/RT in a 6-year-old boy who had a primary spinal cord lesion in the thoracolumbar junction...
May 22, 2018: Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29787440/developments-in-biodosimetry-methods-for-triage-with-a-focus-on-x-band-electron-paramagnetic-resonance-in-vivo-fingernail-dosimetry
#16
Steven G Swarts, Jason W Sidabras, Oleg Grinberg, Dmitriy S Tipikin, Maciej M Kmiec, Sergey V Petryakov, Wilson Schreiber, Victoria A Wood, Benjamin B Williams, Ann Barry Flood, Harold M Swartz
Instrumentation and application methodologies for rapidly and accurately estimating individual ionizing radiation dose are needed for on-site triage in a radiological/nuclear event. One such methodology is an in vivo X-band, electron paramagnetic resonance, physically based dosimetry method to directly measure the radiation-induced signal in fingernails. The primary components under development are key instrument features, such as resonators with unique geometries that allow for large sampling volumes but limit radiation-induced signal measurements to the nail plate, and methodological approaches for addressing interfering signals in the nail and for calibrating dose from radiation-induced signal measurements...
July 2018: Health Physics
https://www.readbyqxmd.com/read/29787423/autoimmune-granulomatous-inflammation-of-lacrimal-glands-and-axonal-neuritis-following-treatment-with-ipilimumab-and-radiation-therapy
#17
Ecaterina Ileana Dumbrava, Veronica Smith, Rasha Alfattal, Adel K El-Naggar, Marta Penas-Prado, Apostolia M Tsimberidou
Immune checkpoint inhibitors such as anti-CTLA-4 (cytotoxic T-lymphocyte-associated protein 4), anti PD-1 (programmed cell death protein 1) and PD-L1 (programmed cell death protein-ligand 1) monoclonal antibodies are emerging as standard oncology treatments in various tumor types. The indications will expand as immunotherapies are being investigated in various tumors with promising results. Currently, there is inadequate identification of predictive biomarkers of response or toxicity. Unique response patterns include pseudoprogression and delayed response...
May 21, 2018: Journal of Immunotherapy
https://www.readbyqxmd.com/read/29786861/temporally-feathered-intensity-modulated-radiation-therapy-a-planning-technique-to-reduce-normal-tissue-toxicity
#18
Juan Carlos López Alfonso, Shireen Parsai, Nikhil Joshi, Andrew Godley, Chirag Shah, Shlomo A Koyfman, Jimmy J Caudell, Clifton D Fuller, Heiko Enderling, Jacob G Scott
PURPOSE: Intensity modulated radiation therapy (IMRT) has allowed optimization of three-dimensional spatial radiation dose distributions permitting target coverage while reducing normal tissue toxicity. However, radiation-induced normal tissue toxicity is a major contributor to patients' quality of life and often a dose-limiting factor in the definitive treatment of cancer with radiation therapy. We propose the next logical step in the evolution of IMRT using canonical radiobiological principles, optimizing the temporal dimension through which radiation therapy is delivered to further reduce radiation-induced toxicity by increased time for normal tissue recovery...
May 22, 2018: Medical Physics
https://www.readbyqxmd.com/read/29786642/determining-the-radiation-enhancement-effects-of-gold-nanoparticles-in-cells-in-a-combined-treatment-with-cisplatin-and-radiation-at-therapeutic-megavoltage-energies
#19
Celina Yang, Kyle Bromma, Wonmo Sung, Jan Schuemann, Devika Chithrani
Combined use of chemotherapy and radiation therapy is commonly used in cancer treatment, but the toxic effects on normal tissue are a major limitation. This study assesses the potential to improve radiation therapy when combining gold nanoparticle (GNP) mediated radiation sensitization with chemoradiation compared to chemoradiation alone. Incorporation of GNPs with 2 Gy, 6 MV (megavoltage) radiation resulted in a 19 ± 6% decrease in survival of MDA-MB-231 cells. Monte-Carlo simulations were performed to assess dosimetric differences in the presence of GNPs in radiation...
May 22, 2018: Cancers
https://www.readbyqxmd.com/read/29786614/a-novel-optimization-framework-for-vmat-with-dynamic-gantry-couch-rotation
#20
Qihui Lyu, Victoria Y Yu, Dan Ruan, Ryan Neph, Daniel O'Connor, Ke Sheng
Existing Volumetric Modulated Arc Therapy (VMAT) optimization using coplanar arcs is highly efficient but usually dosimetrically inferior to intensity modulated radiation therapy (IMRT) with optimized non-coplanar beams. To achieve both dosimetric quality and delivery efficiency, we proposed in this study, a novel integrated optimization method for non-coplanar VMAT (4πVMAT). 4πVMAT with Direct Aperture Optimization (DAO) was achieved by utilizing a least square dose fidelity objective, along with an anisotropic total variation term for regularizing the fluence smoothness, a single segment term for imposing simple apertures, and a group sparsity term for selecting beam angles...
May 22, 2018: Physics in Medicine and Biology
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