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Technology in Cancer Research & Treatment

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https://www.readbyqxmd.com/read/28168937/outcomes-of-spatially-fractionated-radiotherapy-grid-for-bulky-soft-tissue-sarcomas-in-a-large-animal-model
#1
Michael W Nolan, Tracy L Gieger, Alexander A Karakashian, Mariana N Nikolova-Karakashian, Lysa P Posner, Donald M Roback, Judith N Rivera, Sha Chang
GRID directs alternating regions of high- and low-dose radiation at tumors. A large animal model mimicking the geometries of human treatments is needed to complement existing rodent systems (eg, microbeam) and clarify the physical and biological attributes of GRID. A pilot study was undertaken in pet dogs with spontaneous soft tissue sarcomas to characterize responses to GRID. Subjects were treated with either 20 Gy (3 dogs) or 25 Gy (3 dogs), delivered using 6 MV X-rays and a commercial GRID collimator. Acute toxicity and tumor responses were assessed 2, 4, and 6 weeks later...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28168936/dosimetric-comparison-of-real-time-mri-guided-tri-cobalt-60-versus-linear-accelerator-based-stereotactic-body-radiation-therapy-lung-cancer-plans
#2
Andrzej P Wojcieszynski, Patrick M Hill, Stephen A Rosenberg, Craig R Hullett, Zacariah E Labby, Bhudatt Paliwal, Mark W Geurts, R Adam Bayliss, John E Bayouth, Paul M Harari, Michael F Bassetti, Andrew M Baschnagel
PURPOSE: Magnetic resonance imaging-guided radiation therapy has entered clinical practice at several major treatment centers. Treatment of early-stage non-small cell lung cancer with stereotactic body radiation therapy is one potential application of this modality, as some form of respiratory motion management is important to address. We hypothesize that magnetic resonance imaging-guided tri-cobalt-60 radiation therapy can be used to generate clinically acceptable stereotactic body radiation therapy treatment plans...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28168935/reproducibility-of-a-noninvasive-system-for-eye-positioning-and-monitoring-in-stereotactic-radiotherapy-of-ocular-melanoma
#3
Omar Iskanderani, Dominique Béliveau-Nadeau, Robert Doucet, Geneviève Coulombe, Deborah Pascale, David Roberge
PURPOSE: Our preferred treatment for juxtapapillary choroidal melanoma is stereotactic radiotherapy. We aim to describe our immobilization system and quantify its reproducibility. MATERIALS AND METHODS: Patients were identified in our radiosurgery database. Patients were imaged at computed tomography simulator with an in-house system which allows visual monitoring of the eye as the patient fixates a small target. All patients were reimaged at least once prior to and/or during radiotherapy...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28168934/a-comparative-evaluation-of-3-different-free-form-deformable-image-registration-and-contour-propagation-methods-for-head-and-neck-mri
#4
Sara Broggi, Elisa Scalco, Maria Luisa Belli, Gerlinde Logghe, Dirk Verellen, Stefano Moriconi, Anna Chiara, Anna Palmisano, Renata Mellone, Claudio Fiorino, Giovanna Rizzo
PURPOSE: To validate and compare the deformable image registration and parotid contour propagation process for head and neck magnetic resonance imaging in patients treated with radiotherapy using 3 different approaches-the commercial MIM, the open-source Elastix software, and an optimized version of it. MATERIALS AND METHODS: Twelve patients with head and neck cancer previously treated with radiotherapy were considered. Deformable image registration and parotid contour propagation were evaluated by considering the magnetic resonance images acquired before and after the end of the treatment...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28168933/incidental-dose-to-pelvic-nodes-in-bladder-only-radiotherapy
#5
Shirley Lewis, Vedang Murthy, Umesh Mahantshetty, Shyam Kishore Shrivastava
BACKGROUND AND PURPOSE: Although there is a strong biological rationale to electively treat the pelvic nodes during bladder preservation, its clinical benefit is uncertain. This may be explained by the incidental dose received by the nodal regions when treating the bladder alone. This study was conducted to investigate the doses received by the different pelvic nodal regions when the bladder alone is treated by standard conformal radiotherapy. METHODS AND MATERIALS: The computed tomography data sets of 20 patients with node-negative muscle-invasive bladder cancer treated in a bladder preservation protocol were studied...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28093955/anatomically-realistic-simulations-of-liver-ablation-by-irreversible-electroporation
#6
Radwan Qasrawi, Louis Silve, Fernando Burdío, Ziad Abdeen, Antoni Ivorra
Irreversible electroporation is a novel tissue ablation technique which entails delivering intense electrical pulses to target tissue, hence producing fatal defects in the cell membrane. The present study numerically analyzes the potential impact of liver blood vessels on ablation by irreversible electroporation because of their influence on the electric field distribution. An anatomically realistic computer model of the liver and its vasculature within an abdominal section was employed, and blood vessels down to 0...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28071340/respiration-induced-intraorgan-deformation-of-the-liver
#7
Anna K Paulsson, Sue S Yom, Mekhail Anwar, Dilini Pinnaduwage, Atchar Sudhyadhom, Alexander R Gottschalk, Albert J Chang, Martina Descovich
Stereotactic body radiation therapy is a well-tolerated modality for the treatment of primary and metastatic liver lesions, and fiducials are often used as surrogates for tumor tracking during treatment. We evaluated respiratory-induced liver deformation by measuring the rigidity of the fiducial configuration during the breathing cycle. Seventeen patients, with 18 distinct treatment courses, were treated with stereotactic body radiosurgery using multiple fiducials. Liver deformation was empirically quantified by measuring the intrafiducial distances at different phases of respiration...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28052737/changes-in-tumor-volumes-and-spatial-locations-relative-to-normal-tissues-during-cervical-cancer-radiotherapy-assessed-by-cone-beam-computed-tomography
#8
Wenjuan Chen, Penggang Bai, Jianji Pan, Yuanji Xu, Kaiqiang Chen
PURPOSE: To assess changes in the volumes and spatial locations of tumors and surrounding organs by cone beam computed tomography during treatment for cervical cancer. MATERIALS AND METHODS: Sixteen patients with cervical cancer had intensity-modulated radiotherapy and off-line cone beam computed tomography during chemotherapy and/or radiation therapy. The gross tumor volume (GTV-T) and clinical target volumes (CTVs) were contoured on the planning computed tomography and weekly cone beam computed tomography image, and changes in volumes and spatial locations were evaluated using the volume difference method and Dice similarity coefficients...
January 1, 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/28100163/a-vector-based-short-hairpin-rna-targeting-aurora-b-suppresses-human-prostatic-carcinoma-growth
#9
Mei Cao, Panpan Qi, Chong Chen, Liju Song, Xuege Wang, Ningzhe Li, Daoyan Wu, Guoku Hu, Jian Zhao
Aurora kinase B, playing a vital, important role in mitosis, is frequently detected to be overexpressed in many cancer cell lines and various tumor tissues, including prostatic carcinoma. Given the essential function of Aurora kinase B in mitosis and its association with tumorigenesis, it might be a drug target for prostatic carcinoma treatment. In our study, short hairpin RNA targeting Aurora kinase B was cloned into a pGPU6 plasmid vector and then transfected into human prostatic carcinoma cells. The expression level of Aurora kinase B was verified by reverse transcription-polymerase chain reaction and Western blot...
February 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/27884943/recombinant-staphylococcal-enterotoxin-type-a-stimulate-antitumoral-cytokines
#10
Reza Agheli, Bijan Emkanian, Raheleh Halabian, Jalil Fallah Mehrabadi, Abbas Ali Imani Fooladi
BACKGROUND: About 20 different types of staphylococcal enterotoxins are produced by Staphylococcus aureus, in which type A is more common in food poisoning syndrome. Also staphylococcal enterotoxin A superantigen is a potent inducer of cytotoxic T lymphocyte activity and cytokine production and could stimulate T cells containing T-cell receptor beta chain domains when binding to major histocompatibility complex class II molecules. Hence, it is an important reagent in cancer immunotherapy...
February 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/27837054/the-safety-and-efficacy-of-irreversible-electroporation-for-large-hepatocellular-carcinoma
#11
Jianying Zeng, Guifeng Liu, Zhong-Hai Li, Yi Yang, Gang Fang, Rong-Rong Li, Ke-Cheng Xu, Lizhi Niu
This study aimed to investigate the safety and effectiveness of irreversible electroporation ablation for unresectable large liver cancer. Fourteen patients were enrolled: 8 with large hepatocellular carcinoma (tumor diameter: 5.1-11.5 cm) and 6 with medium hepatocellular carcinoma (tumor diameter: 3.0-4.1 cm). All patients received percutaneous irreversible electroporation ablation. Ablation time and the incidence of complications were assessed by a t test. Post-irreversible electroporation and regular contrast-enhanced computerized tomography scans were performed to investigate the effect of tumor size (large vs medium) on irreversible electroporation treatment efficacy; 4-table data were assessed using a Fisher exact test...
February 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/26846266/microrna-96-regulates-apoptosis-by-targeting-pdcd4-in-human-glioma-cells
#12
Qing-Qing Ma, Jian-Ting Huang, Yun-Gang Xiong, Xiao-Yan Yang, Ran Han, Wang-Wen Zhu
Glioblastoma multiforme, the most common and aggressive form of primary brain tumor, presents a dismal prognosis. MicroRNAs play a critical role in the initiation, progression, and metastasis of cancer; however, the potential biological role of miRNAs in glioblastoma multiforme remains largely unknown. In our study, we found that microRNA-96 is upregulated in glioma tissues than in normal human brains. Transfection of microRNA-96 mimics into glioma cells significantly decreases apoptosis by suppressing PDCD4, a well-known tumor suppressor that is involved in apoptosis...
February 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/26834116/correction-of-bowtie-filter-normalization-and-crescent-artifacts-for-a-clinical-cbct-system
#13
Hong Zhang, Vic Kong, Ke Huang, Jian-Yue Jin
PURPOSE: To present our experiences in understanding and minimizing bowtie-filter crescent artifacts and bowtie-filter normalization artifacts in a clinical cone beam computed tomography system. METHODS: Bowtie-filter position and profile variations during gantry rotation were studied. Two previously proposed strategies (A and B) were applied to the clinical cone beam computed tomography system to correct bowtie-filter crescent artifacts. Physical calibration and analytical approaches were used to minimize the norm phantom misalignment and to correct for bowtie-filter normalization artifacts...
February 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/26834115/individualized-radiation-dose-escalation-based-on-the-decrease-in-tumor-fdg-uptake-and-normal-tissue-constraints-improve-survival-in-patients-with-esophageal-carcinoma
#14
Jinbo Ma, Zhaoyang Wang, Chengde Wang, Ercheng Chen, Yaozong Dong, Yipeng Song, Wei Wang, Dong You, Wei Jiang, Rukun Zang
BACKGROUND: To determine whether individualized radiation dose escalation after planned chemoradiation based on the decrease in tumor and normal tissue constraints can improve survival in patients with esophageal carcinoma. METHODS: From August 2005 to December 2010, 112 patients with squamous esophageal carcinoma were treated with radical concurrent chemoradiation. Patients received positron emission tomography-computer tomography scan twice, before radiation and after radiation dose of 50...
February 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/26818026/gpu-based-simulation-of-ultrasound-imaging-artifacts-for-cryosurgery-training
#15
Robert Keelan, Kenji Shimada, Yoed Rabin
This study presents an efficient computational technique for the simulation of ultrasound imaging artifacts associated with cryosurgery based on nonlinear ray tracing. This study is part of an ongoing effort to develop computerized training tools for cryosurgery, with prostate cryosurgery as a development model. The capability of performing virtual cryosurgical procedures on a variety of test cases is essential for effective surgical training. Simulated ultrasound imaging artifacts include reverberation and reflection of the cryoprobes in the unfrozen tissue, reflections caused by the freezing front, shadowing caused by the frozen region, and tissue property changes in repeated freeze-thaw cycles procedures...
February 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/26818025/customized-tool-for-the-validation-of-optical-coherence-tomography-in-differentiation-of-prostate-cancer
#16
B G Muller, A Swaan, D M de Bruin, W van den Bos, A W Schreurs, D J Faber, E C H Zwartkruis, L Rozendaal, A N Vis, J A Nieuwenhuijzen, R J A van Moorselaar, T G van Leeuwen, J J M C H de la Rosette
OBJECTIVE: To design and demonstrate a customized tool to generate histologic sections of the prostate that directly correlate with needle-based optical coherence tomography pullback measurements. MATERIALS AND METHODS: A customized tool was created to hold the prostatectomy specimens during optical coherence tomography measurements and formalin fixation. Using the tool, the prostate could be sliced into slices of 4 mm thickness through the optical coherence tomography measurement trajectory...
February 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/26809240/early-candidate-biomarkers-of-non-small-cell-lung-cancer-are-screened-and-identified-in-premalignant-lung-lesions
#17
Yandong Nan, Jie Du, Lijie Ma, Hua Jiang, Faguang Jin, Shuanying Yang
A specific protein profile that accompanies neoplastic transformation in the premalignant airway epithelium could provide an opportunity for early diagnosis of lung cancer. The aim of this study was to screen and identify early candidate biomarkers of non-small cell lung cancer. Thirteen non-small cell lung cancer samples were obtained within 30 minutes after a surgical resection. Laser capture microdissection was performed to enrich the normal lung cell and squamous metaplasia or atypical adenomatous hyperplasia cell populations...
February 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/26792491/limitations-of-pet-ct-in-the-detection-of-occult-n1-metastasis-in-clinical-stage-i-t1-2an0-non-small-cell-lung-cancer-for-staging-prior-to-stereotactic-body-radiotherapy
#18
Adil S Akthar, Mark K Ferguson, Matthew Koshy, Wickii T Vigneswaran, Renuka Malik
PURPOSE/OBJECTIVES: Patients receiving stereotactic body radiotherapy for stage I non-small cell lung cancer are typically staged clinically with positron emission tomography-computed tomography. Currently, limited data exist for the detection of occult hilar/peribronchial (N1) disease. We hypothesize that positron emission tomography-computed tomography underestimates spread of cancer to N1 lymph nodes and that future stereotactic body radiotherapy patients may benefit from increased pathologic evaluation of N1 nodal stations in addition to N2 nodes...
February 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/26792490/advanced-small-animal-conformal-radiation-therapy-device
#19
Sunil Sharma, Ganesh Narayanasamy, Beata Przybyla, Jessica Webber, Marjan Boerma, Richard Clarkson, Eduardo G Moros, Peter M Corry, Robert J Griffin
We have developed a small animal conformal radiation therapy device that provides a degree of geometrical/anatomical targeting comparable to what is achievable in a commercial animal irradiator. small animal conformal radiation therapy device is capable of producing precise and accurate conformal delivery of radiation to target as well as for imaging small animals. The small animal conformal radiation therapy device uses an X-ray tube, a robotic animal position system, and a digital imager. The system is in a steel enclosure with adequate lead shielding following National Council on Radiation Protection and Measurements 49 guidelines and verified with Geiger-Mueller survey meter...
February 2017: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/26755751/norcantharidin-inhibits-sk-n-sh-neuroblastoma-cell-growth-by-induction-of-autophagy-and-apoptosis
#20
Zeping Han, Baoxia Li, Juanjuan Wang, Xiangqiang Zhang, Zhenhua Li, Liting Dai, Mingrong Cao, Jianwei Jiang
Norcantharidin, a low-toxic analog of the active anticancer compound cantharidin in Mylabris, can inhibit proliferation and induce apoptosis of multiple types of cancer cells. However, the anticancer activities of norcantharidin with respect to neuroblastoma, and its underlying mechanisms, have not been investigated. Therefore, our study was designed to determine the efficacy of norcantharidin on SK-N-SH neuroblastoma cell death and to elucidate detailed mechanisms of activity. In the present study, norcantharidin suppressed the proliferation and cloning ability of SK-N-SH cells in a dose-dependent manner, apparently by reducing the mitochondrial membrane potential and arresting SK-N-SH cells at the G2/M stage, accompanied by elevated expressions of p21 and decreased expressions of cyclin B1 and cell division control 2...
February 2017: Technology in Cancer Research & Treatment
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