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Reports of Practical Oncology and Radiotherapy

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https://www.readbyqxmd.com/read/29991930/patterns-of-treatment-failure-in-salivary-gland-cancers
#1
Mateusz Szewczyk, Paweł Golusiński, Jakub Pazdrowski, Piotr Pieńkowski, Sławomir Marszałek, Jacek Sygut, Wojciech Golusiński
Aim: The purpose of the study was to publish our experience of salivary gland cancer treatment with large number of patients treated at a single institution. Background: Salivary gland cancers are rare tumors of the head and neck representing about 5% of cancers in that region and about 0.5% of all malignancies. Due to the rarity of the disease, most of the studies regarding treatment outcome consist of low number of patients, thus making it difficult to draw conclusions...
July 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29991929/intensity-modulated-radiation-therapy-and-volumetric-modulated-arc-therapy-versus-conventional-conformal-techniques-at-high-energy-dose-assessment-and-impact-on-second-primary-cancer-in-the-out-of-field-region
#2
Beatriz Sánchez-Nieto, Maria Romero-Expósito, José Antonio Terrón, Leticia Irazola, Marta Paiusco, Elisabetta Cagni, Caterina Ghetti, Silvano Filice, Francisco Sánchez-Doblado
The aim of this work was to estimate peripheral neutron and photon doses associated with the conventional 3D conformal radiotherapy techniques in comparison to modern ones such as Intensity modulated radiation therapy and volumetric modulated arc therapy. Assessment in terms of second cancer incidence ought to peripheral doses was also considered. For that, a dosimetric methodology proposed by the authors has been applied beyond the region where there is no CT information and, thus, treatment planning systems do not calculate and where, nonetheless, about one third of second primary cancers occurs...
July 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29991928/absolute-dose-verification-of-static-intensity-modulated-radiation-therapy-imrt-with-ion-chambers-of-various-volumes-and-tld-detectors
#3
Hediye Acun-Bucht, Ebru Tuncay, Emin Darendeliler, Gönül Kemikler
Aim: This study aims at examining absolute dose verification of step-and-shoot intensity modulated radiation treatment (IMRT) of prostate and brain patients by use of ion chambers of two different volumes and thermoluminescent detectors (TLD). Background: The volume of the ion chamber (IC) is very important for absolute dose verification of IMRT plans since the IC has a volume average effect. With TLD detectors absolute dose verification can be done measuring the dose of multiple points simultaneously...
July 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29991927/immobilization-versus-no-immobilization-for-pelvic-external-beam-radiotherapy
#4
Avinash H Udayashankar, Shibina Noorjahan, Nirmala Srikantia, K Ravindra Babu, Sandeep Muzumder
Aim: To identify the most reproducible technique of patient positioning and immobilization during pelvic radiotherapy. Background: Radiotherapy plays an important role in the treatment of pelvic malignancies. Errors in positioning of patient are an integral component of treatment. The present study compares two methods of immobilization with no immobilization with an aim of identifying the most reproducible method. Materials and methods: 65 consecutive patients receiving pelvic external beam radiotherapy were retrospectively analyzed...
July 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29765265/is-volumetric-modulated-arc-therapy-with-constant-dose-rate-a-valid-option-in-radiation-therapy-for-head-and-neck-cancer-patients
#5
Annamaria Didona, Valentina Lancellotta, Claudio Zucchetti, Bianca Moira Panizza, Alessandro Frattegiani, Martina Iacco, Anna Concetta Di Pilato, Simonetta Saldi, Cynthia Aristei
Background: Intensity-modulated radiotherapy (IMRT) improves dose distribution in head and neck (HN) radiation therapy. Volumetric-modulated arc therapy (VMAT), a new form of IMRT, delivers radiation in single or multiple arcs, varying dose rates (VDR-VMAT) and gantry speeds, has gained considerable attention. Constant dose rate VMAT (CDR-VMAT) associated with a fixed gantry speed does not require a dedicated linear accelerator like VDR-VMAT. The present study explored the feasibility, efficiency and delivery accuracy of CDR-VMAT, by comparing it with IMRT and VDR-VMAT in treatment planning for HN cancer...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29765264/coping-with-loss-of-ability-vs-emotional-control-and-self-esteem-in-women-after-mastectomy
#6
Katarzyna Cieślak, Wojciech Golusiński
Aim: Does coping with the loss of ability depend on self-esteem and emotional control? Background: Persons who experience losses in two dimensions, i.e. health and ability can deal with the loss by physical therapy, and also by mental and socio-professional rehabilitation. But far and foremost, it is the personality of the person who experiences the loss that matters most. Materials and methods: The study included 37 patients after mastectomy...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29760598/predictors-of-chemoradiation-related-febrile-neutropenia-prophylaxis-in-older-adults-experience-from-a-limited-resource-setting
#7
Aparna Gangopadhyay
Aim: To identify risk factors that lower efficacy of antibiotic prophylaxis of febrile neutropenia among older patients on chemoradiation. Background: Audit of institutional data showed that older adults are at higher risk of febrile neutropenia during chemoradiation. In limited resource settings widespread use of Granulocyte-Colony Stimulating Factor (G-CSF) is not economically feasible and antibiotics are used commonly. Despite compliance with antibiotics, prophylaxis is inadequate in many patients owing to patient and tumor related factors...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29760597/application-of-an-incident-taxonomy-for-radiation-therapy-analysis-of-five-years-of-data-from-three-integrated-cancer-centres
#8
Stuart Greenham, Stephen Manley, Kirsty Turnbull, Matthew Hoffmann, Amara Fonseca, Justin Westhuyzen, Andrew Last, Noel J Aherne, Thomas P Shakespeare
Aim: To develop and apply a clinical incident taxonomy for radiation therapy. Background: Capturing clinical incident information that focuses on near-miss events is critical for achieving higher levels of safety and reliability. Methods and materials: A clinical incident taxonomy for radiation therapy was established; coding categories were prescription, consent, simulation, voluming, dosimetry, treatment, bolus, shielding, imaging, quality assurance and coordination of care...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29760596/-11-c-methionine-positron-emission-tomography-for-target-delineation-of-recurrent-glioblastoma-in-re-irradiation-planning
#9
Hidekazu Tanaka, Takahiro Yamaguchi, Kae Hachiya, Kazuhiro Miwa, Jun Shinoda, Masahide Hayashi, Shinichi Ogawa, Hironori Nishibori, Satoshi Goshima, Masayuki Matsuo
Aim: To define the optimal margin on MRI scans in the re-radiation planning of recurrent glioblastoma using methionine positron emission tomography (MET-PET). Background: It would be very useful if the optimal margin on MRI to cover the uptake area on MET-PET is known. Materials and Methods: CT, MRI, and MET-PET were performed separately over the course of 2 weeks. Among the MRI scans, we used the contrast-enhanced T1-weighted images (Gd-MRI) and T2-weighted images (T2-MRI)...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29760595/application-of-induced-pluripotency-in-cancer-studies
#10
REVIEW
Patrycja Czerwińska, Sylwia Mazurek, Maciej Wiznerowicz
As soon as induced pluripotent stem cells (iPSCs) reprogramming of somatic cells were developed, the discovery attracted the attention of scientists, offering new perspectives for personalized medicine and providing a powerful platform for drug testing. The technology was almost immediately applied to cancer studies. As presented in this review, direct reprogramming of cancer cells with enforced expression of pluripotency factors have several basic purposes, all of which aim to explain the complex nature of cancer development and progression, therapy-resistance and relapse, and ultimately lead to the development of novel anti-cancer therapies...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29760594/uncertainty-in-positioning-ion-chamber-at-reference-depth-for-various-water-phantoms
#11
Naoki Kinoshita, Hiroshi Oguchi, Toshiki Adachi, Hiroki Shioura, Hirohiko Kimura
Background: Uncertainty in the calibration of high-energy radiation sources is dependent on user and equipment type. Aim: We evaluated the uncertainty in the positioning of a cylindrical chamber at a reference depth for reference dosimetry of high-energy photon beams and the resulting uncertainty in the chamber readings for 6- and 10-MV photon beams. The aim was to investigate major contributions to the positioning uncertainty to reduce the uncertainty in calibration for external photon beam radiotherapy...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29760593/dosimetric-effect-of-limited-aperture-multileaf-collimator-on-vmat-plan-quality-a-study-of-prostate-and-head-and-neck-cancers
#12
Ghulam Murtaza, Shahid Mehmood, Shahid Rasul, Imran Murtaza, Ehsan Ullah Khan
Aim: The aim of study was to evaluate the dosimetric effect of collimator-rotation on VMAT plan quality, when using limited aperture multileaf collimator of Elekta Beam Modulator™ providing a maximum aperture of 21 cm × 16 cm. Background: The increased use of VMAT technique to deliver IMRT from conventional to very specialized treatments present a challenge in plan optimization. In this study VMAT plans were optimized for prostate and head and neck cancers using Elekta Beam-ModulatorTM , whereas previous studies were reported for conventional Linac aperture...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29760592/4d-modeling-in-a-gimbaled-linear-accelerator-by-using-gold-anchor-markers
#13
Hideharu Miura, Shuichi Ozawa, Takaaki Matsuura, Atsushi Kawakubo, Fumika Hosono, Kiyoshi Yamada, Yasushi Nagata
Purpose: The purpose of this study was to verify whether the dynamic tumor tracking (DTT) feature of a Vero4DRT system performs with 10-mm-long and 0.28 mm diameter gold anchor markers. Methods: Gold anchor markers with a length of 10 mm and a diameter of 0.28 mm were used. Gold anchor markers were injected with short and long types into bolus material. These markers were sandwiched by a Tough Water (TW) phantom in the bolus material. For the investigation of 4-dimensional (4D) modeling feasibility under various phantom thicknesses, the TW phantom was added at 2 cm intervals (in upper and lower each by 1 cm)...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29760591/cyberknife-stereotactic-radiosurgery-in-brain-metastases-a-report-from-latin-america-with-literature-review
#14
Cuauhtémoc de la Peña, Jorge H Guajardo, María F Gonzalez, César González, Benjamín Cruz
Background and aim: Stereotactic radiosurgery is increasingly being employed for the treatment of brain metastases, both as an adjuvant to surgical resection, and also as a primary treatment modality. The aim of this study is to evaluate overall survival and local control in patients with brain metastases treated with CyberKnife Stereotactic Radiosurgery (CKRS), due to the lack of evidence reported in Latin America. Materials and methods: We performed a retrospective chart review from October 2011 to January 2017 of 49 patients with 152 brain metastases...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29760590/evaluation-of-high-grade-astrocytoma-recurrence-patterns-after-radiotherapy-in-the-era-of-temozolomide-a-single-institution-experience
#15
Arno Lotar Cordova, Taynná Vernalha Rocha Almeida, Cintia Mara da Silva, Pedro Argolo Piedade, Cristiane Maria Almeida, Carlos Genesio Bezzera Lima, Carolina Dutra, Rafael Martins Ferreira, Marcelo Neves Linhares, Valeriy Denyak
Aim: Evaluating the recurrence patterns of high-grade astrocytomas in patients who were treated with radiotherapy (RT) plus temozolomide (TMZ). Background: The current literature suggests that reducing the margins added to the CTV does not significantly change the risk of recurrence and overall survival; thus, we decided to analyze our data and to examine the possibility of changing the adopted margins. Materials and methods: From February 2008 till September 2013, 55 patients were treated for high-grade astrocytomas, 20 patients who had been confirmed to have recurrence were selected for the present study...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29760589/tumor-microenvironment-unknown-niche-with-powerful-therapeutic-potential
#16
REVIEW
Tomasz Kolenda, Weronika Przybyła, Marta Kapałczyńska, Anna Teresiak, Maria Zajączkowska, Renata Bliźniak, Katarzyna M Lamperska
Head and neck squamous cell carcinomas (HNSCC) are in a group of cancers that are the most resistant to treatment. The survival rate of HNSCC patients has been still very low since last 20 years. The existence of relationship between oncogenic and surrounding cells is probably the reason for a poor response to treatment. Fibroblasts are an important element of tumor stroma which increases tumor cells ability to proliferate. Another highly resistance, tumorigenic and metastatic cell population in tumor microenvironment are cancer initiating cells (CICs)...
May 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29681775/does-itv-vaginal-procedure-ensure-dosimetric-coverage-during-imrt-of-post-operative-gynaecological-tumours-without-instructions-concerning-rectal-filling
#17
Ramona Verges, Alexandra Giraldo, Alejandro Seoane, Elisabet Toral, M Carmen Ruiz, Ariadna Pons, Jordi Giralt
Aim: To find out whether the internal target volume (ITV) vaginal procedure ensures dosimetric coverage during intensity-modulated radiation therapy (IMRT) of post-operative gynaecological tumours without instructions on rectal filling. Background: The ITV vaginal procedure does not necessarily include all movements of the bladder, and does not include changes in the rectal volume. We should know if the vaginal ITV is a useful tool in maintaining CTV coverage during treatment...
March 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29681774/high-accuracy-dosimetry-with-small-pieces-of-gafchromic-films
#18
Ryszard Dąbrowski, Izabela Drozdyk, Paweł Kukołowicz
Aim: To investigate the influence of several factors on the accuracy of dose measurements and feasibility of application of small Gafchromic detectors for postal audit. Background: Our experience showed that precision of dose measurements with small pieces of Gafchromic films may be significantly improved. Materials and methods: Gafchromic films with dimensions of 1 × 1, 2 × 2 and 3 × 3 cm2 were exposed to 6 MV X-rays at dose levels of 50 cGy-210 cGy...
March 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29681773/accuracy-evaluation-of-distance-inverse-square-law-in-determining-virtual-electron-source-location-in-siemens-primus-linac
#19
Hamid Shafaei Douk, Mahmoud Reza Aghamiri, Mahdi Ghorbani, Bagher Farhood, Mohsen Bakhshandeh, Hamid Reza Hemmati
Aim: The aim of this study is to evaluate the accuracy of the inverse square law (ISL) method for determining location of virtual electron source ( S Vir ) in Siemens Primus linac. Background: So far, different experimental methods have presented for determining virtual and effective electron source location such as Full Width at Half Maximum (FWHM), Multiple Coulomb Scattering (MCS), and Multi Pinhole Camera (MPC) and Inverse Square Law (ISL) methods. Among these methods, Inverse Square Law is the most common used method...
March 2018: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/29681772/thymic-tumors-and-results-of-radiotherapy
#20
Sureyya Sarıhan, Ahmet Sami Bayram, Cengiz Gebitekin, Omer Yerci, Deniz Sıgırlı
Aim: The aim of this study was to evaluate thymic epithelial tumors (TETs) for treatment outcomes and prognostic factors on survival. Background: TETs are very rare neoplasms and multidisciplinary approach is recommended according to prognostic factors. Materials and methods: Between 1995 and 2013, 31 patients were treated with median 5400 cGy (range: 1620-6596 cGy) radiotherapy (RT). Eleven patients received adjuvant or concurrent chemotherapy...
March 2018: Reports of Practical Oncology and Radiotherapy
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