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https://www.readbyqxmd.com/read/28106504/insulin-like-growth-factor-1-mediated-dna-repair-in-irradiated-salivary-glands-is-sirtuin-1-dependent
#1
S Meyer, A M Chibly, R Burd, K H Limesand
Ionizing radiation is one of the most common cancer treatments; however, the treatment leads to a wide range of debilitating side effects. In patients with head and neck cancer (HNC), the surrounding normal salivary gland is extremely sensitive to therapeutic radiation, and damage to this tissue results in various oral complications and decreased quality of life (QOL). In the current study, mice treated with targeted head and neck radiation showed a significant increase in double-stranded breaks (DSB) in the DNA of parotid salivary gland cells immediately after treatment, and this remained elevated 3 h posttreatment...
February 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28071626/prognostic-factors-in-postoperative-radiotherapy-in-salivary-gland-carcinoma-a-single-institution-experience-from-turkey
#2
M Kandaz, G Soydemir, Z Bahat, E Canyılmaz, A Yöney
BACKGROUND: We reviewed clinical characteristics, treatment outcomes, local and distant failure and prognostic factors in patients with salivary gland carcinoma treated with surgery and postoperative radiotherapy. MATERIALS AND METHODS: We retrospectively reviewed 75 patients with salivary gland cancer. 69 (%92) patients had cancer of the parotid gland, 3 (%4) patients had cancer of the submandibular gland and 3 (%4) patients had cancer of the minor salivary gland...
April 2016: Indian Journal of Cancer
https://www.readbyqxmd.com/read/28061862/bulbar-conjunctival-metastasis-from-mucoepidermoid-carcinoma-of-parotid-a-case-report-and-review-of-literature
#3
Rajshri Yadav, Azhar J Battoo, Abdul W Mir, Altaf G Haji
BACKGROUND: Mucoepidermoid carcinoma of salivary glands usually metastasizes to the lungs, liver, bone, brain, and skin. We report a rare case of distant metastasis of high-grade mucoepidermoid carcinoma of the parotid to the ipsilateral bulbar conjunctiva of the eye. CASE PRESENTATION: Sixty-year-old male of Kashmiri origin presented to our tertiary care referral cancer institute with exophytic lesion of the left bulbar conjunctiva following his treatment for mucoepidermoid cancer of ipsilateral parotid gland, 9 months back...
January 7, 2017: World Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28048945/organotypic-spheroid-culture-to-mimic-radiation-induced-salivary-hypofunction
#4
H S Shin, H Y An, J S Choi, H J Kim, J Y Lim
Radiation treatment often leads to irreversible damage to normal salivary glands (SGs) because of their proximity to head and neck cancers. Optimization of the in vitro model of irradiation (IR)-induced SG damage is warranted to investigate pathophysiology and monitor treatment outcome. Here, we present an organotypic spheroid culture model to investigate the impact of IR on SGs and the mechanisms underlying IR-induced structural and functional changes. Human parotid epithelial cells were obtained from human parotid glands and plated on either plastic plates or Matrigel...
December 1, 2016: Journal of Dental Research
https://www.readbyqxmd.com/read/28048914/su-g-brc-02-a-novel-multi-criteria-optimization-approach-to-generate-deliverable-intensity-modulated-radiation-therapy-imrt-treatment-plans
#5
G Kirlik, W D'Souza, H Zhang
PURPOSE: To present a novel multi-criteria optimization (MCO) solution approach that generates treatment plans with deliverable apertures using column generation. METHODS: We demonstrate our method with 10 locally advanced head-and-neck cancer cases retrospectively. In our MCO formulation, we defined an objective function for each structure in the treatment volume. This resulted in 9 objective functions, including 3 distinct objectives for primary target volume, high-risk and low-risk target volumes, 5 objectives for each of the organs-at-risk (OARs) (two parotid glands, spinal cord, brain stem and oral cavity), and one for the non-target non-OAR normal tissue...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048821/mo-g-201-02-comparing-sample-size-requirements-for-knowledge-based-treatment-planning
#6
J J Boutilier, A D C Babier, T Craig, A L McNiven, M B Sharpe, T C Y Chan
PURPOSE: To compare how training set size affects the accuracy of a knowledge-based planning (KBP) model applied to prostate and head and neck (HN) cancer. METHODS: We selected a KBP model from the literature that uses distance-to-target histograms and organ volumes to predict an achievable dose-volume-histogram (DVH) curve for each organ-at-risk (OAR). We trained both the prostate and HN model using training set sizes of n=10, 20, 30, 50,75, and 100. We set aside 100 randomly selected treatment plans from each of the two respective cohorts of 218 to serve as a validation set for all experiments...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048650/su-f-t-195-systematic-constraining-of-contralateral-parotid-gland-led-to-improved-dosimetric-outcomes-for-multi-field-optimization-with-scanning-beam-proton-therapy-promising-results-from-a-pilot-study-in-patients-with-base-of-tongue-carcinoma
#7
R Wu, C Crowford, R Georges, A Liu, M Amin, T Sio, B Gunn, F Poenisch, M Palmer, M Gillin, S Frank, X Zhu
PURPOSE: Treatment planning for Intensity Modulated Proton Therapy (IMPT) for head and neck cancer is time-consuming due to the large number of organs-at-risk (OAR) to be considered. As there are many competing objectives and also wide range of acceptable OAR constraints, the final approved plan may not be most optimal for the given structures. We evaluated the dose reduction to the contralateral parotid by implementing standardized constraints during optimization for scanning beam proton therapy planning...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048503/su-d-204-04-correlations-between-dosimetric-indices-and-follow-up-data-for-salivary-glands-six-months-after-radiation-therapy-for-head-and-neck-cancer
#8
B Chera, A Price, M Kostich, R Amdur, W Mendenhall, N Sheets, R Green, L Marks, S Das, P Mavroidis
PURPOSE: To investigate the correlation between different dosimetric indices of salivary glands (as separate or combined structures) to patient-reported dry mouth 6 months post radiotherapy using the novel patient reported outcome version of the CTCAE (PRO-CTCAE). METHODS: Forty-three patients with oropharyngeal squamous cell carcinoma were treated on a prospective multi-institutional study. All patients received de-intensified 60 Gy intensity modulated radiotherapy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048265/su-g-brc-03-a-novel-multi-criteria-optimization-method-for-volumetric-modulated-arc-therapy-vmat-treatment-planning
#9
G Kirlik, W D'Souza, H Zhang
PURPOSE: To present a novel multi-criteria optimization (MCO) solution approach that generates treatment plans for VMAT. METHODS: We demonstrate our method with generating double-arc VMAT plans for 10 locally advanced head-and-neck cancer cases retrospectively. In our MCO formulation, we defined an objective function for each structure in the treatment volume. This resulted in 9 objective functions, including 3 distinct objectives for primary, high-risk and low-risk target volumes, 5 objectives for each of the organs-at-risk (OARs) (two parotid glands, spinal cord, brain stem and oral cavity), and one for the non-target non-OAR normal tissue...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047950/su-f-t-343-dosimetric-investigation-for-fluence-smoothing-on-vmat-plans-in-monaco-for-head-neck-cancers
#10
K Jassal, B Sarkar, T Ganesh, H Kaur, U Giri, B Mohanti, A Munshi
PURPOSE: The study investigates the effect of fluence smoothing parameter on VMAT plans for ten head-neck cancer patients using Monaco5.00.04. METHODS: VMAT plans were created using Monaco5.00.04 planning system for 10 head-neck patients. Four plans were generated for each patient using available smoothing parameters i.e. high, medium, low and off. The number of monitor units required to deliver 1 cGy was defined as a modulation degree; and was taken as a measure of plan complexity...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047866/su-f-t-357-dosimetric-comparison-of-automatic-imrt-planning-and-manual-imrt-plan-for-head-and-neck-cancer
#11
X Chang, K Li, W Hu
PURPOSE: The purpose of this study is to compare dosimetric differences of Auto-planning and manual IMRT plan and investigate the feasibility and efficiency of the Auto-planning in the nasopharyngeal carcinoma (NPC). METHODS: Ten patients with NPC treated were enrolled in this study. Two IMRT plans were generated for each patient: manually optimized clinical plan and the automatically optimized plan using the Pinnacle Auto-planning (Auto plan). All the plan parameters such as gantry angle, the maximum number of iterations, the maximum number of control points, minimum segment MU and area are same, except the optimization method...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047821/su-f-t-523-radiobiological-comparison-of-helical-tomotherapy-and-vmat-in-the-treatment-of-head-and-neck-tumors
#12
R Woods, P Mavroidis, M Lehman-Davis, M Kostich, T Cook, B Chera, S Das, J Lian
PURPOSE: This study aims at comparing the efficacy of Helical Tomotherapy (TOMO) and Volumetric Modulated Arc Therapy (VMAT) in producing highly conformal dose distributions in challenging head & neck cancer patients. Furthermore, to interpret the dosimetric findings into expected tissue response rates in order to estimate their clinical impact. METHODS: Seven patients were studied and for each patient two treatment plans (one TOMO and one VMAT) were created. Structures used for optimization were: high risk PTV, standard risk PTV, brainstem, spinal cord, parotid gland, larynx, mandible and surrounding tissue...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047807/su-d-brb-02-combining-a-commercial-autoplanning-engine-with-database-dose-predictions-to-further-improve-plan-quality
#13
S P Robertson, J A Moore, X Hui, T L DeWeese, P Tran, H Quon, Z Cheng, K Bzdusek, P Kumar, T R McNutt
PURPOSE: Database dose predictions and a commercial autoplanning engine both improve treatment plan quality in different but complimentary ways. The combination of these planning techniques is hypothesized to further improve plan quality. METHODS: Four treatment plans were generated for each of 10 head and neck (HN) and 10 prostate cancer patients, including Plan_A: traditional IMRT optimization using clinically relevant default objectives; Plan_B: traditional IMRT optimization using database dose predictions; Plan_C: autoplanning using default objectives; and Plan_D: autoplanning using database dose predictions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047669/we-h-brc-07-validation-of-a-commercial-atlas-based-auto-segmentation-package-for-automated-contour-quality-control
#14
S Berry, K Jedruszczuk, H Veeraraghavan, A Apte, Z Saleh, M Hunt
PURPOSE: To investigate whether a commercial atlas based auto-segmentation (ABAS) package can be used for automated review and quality control (QC) of physician segmentations, and if so, to determine action levels for future clinical implementation. METHODS: 42 head and neck cancer (HNC) patient plan CT scans with manually defined expert physician organ at risk (OAR) segmentations were retrospectively identified. Five representative patients were selected as ABAS models and were subsequently applied to each of the remaining 37 studies, resulting in 5 auto-segmentations (AS) per patient...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047665/su-d-201-01-a-multi-institutional-study-quantifying-the-impact-of-simulated-linear-accelerator-vmat-errors-for-nasopharynx
#15
E Pogson, C Hansen, S Blake, S Arumugam, J Juresic, C Ochoa, J Yakobi, A Haman, A Trtovac, L Holloway, D Thwaites
PURPOSE: To quantify the impact of differing magnitudes of simulated linear accelerator errors on the dose to the target volume and organs at risk for nasopharynx VMAT. METHODS: Ten nasopharynx cancer patients were retrospectively replanned twice with one full arc VMAT by two institutions. Treatment uncertainties (gantry angle and collimator in degrees, MLC field size and MLC shifts in mm) were introduced into these plans at increments of 5,2,1,-1,-2 and -5. This was completed using an in-house Python script within Pinnacle3 and analysed using 3DVH and MatLab...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047323/su-f-t-168-development-and-implementation-of-an-anthropomorphic-head-neck-phantom-for-the-assessment-of-proton-therapy-treatment-procedures
#16
D Branco, P Taylor, S Frank, H Li, X Zhang, H Mehrens, M Guindani, D Followill
PURPOSE: To design a Head and Neck (H&N) anthropomorphic QA phantom that the Imaging and Radiation Oncology Core Houston (IROC-H) can use to verify the quality of intensity modulated proton therapy (IMPT) H&N treatments for institutions participating in NCI clinical trials. METHODS: The phantom was created to serve as a remote auditing tool for IROC-H to evaluate an institution's IMPT planning and delivery abilities. The design was based on the composition, size, and geometry of a generalized oropharyngeal tumor and contains critical structures (parotids and spinal cord)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047305/su-f-t-224-importance-of-timely-review-of-daily-cone-beam-cts-dosimetric-evaluation-of-rejected-cbcts-for-head-and-neck-patients
#17
M Andrews, S Lin, N Yu, N Joshi, S Koyfman, P Xia
PURPOSE: To dosimetrically evaluate the importance of timely reviewing daily CBCTs for patients with head and neck cancer. METHODS: After each fraction daily cone-beam CT (CBCT) for head and neck patients are reviewed by physicians prior to next treatment. Physician rejected image registrations of CBCT were identified and analyzed for 17 patients. These CBCT images were rigidly fused with planning CT images and the contours from the planning CT were transferred to CBCTs...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047302/su-f-t-186-a-treatment-planning-study-of-normal-tissue-sparing-with-robustness-optimized-impt-4pi-imrt-and-vmat-for-head-and-neck-cases
#18
J Zhang, D Nguyen, K Woods, A Tran, X Li, X Ding, P Kabolizadeh, T Guerrero, K Sheng
PURPOSE: We performed a retrospective dosimetric comparison study between the robustness optimized Intensity Modulated Proton Therapy (RO-IMPT), volumetric-modulated arc therapy (VMAT), and the non-coplanar 4? intensity modulated radiation therapy (IMRT). These methods represent the most advanced radiation treatment methods clinically available. We compare their dosimetric performance for head and neck cancer treatments with special focus on the OAR sparing near the tumor volumes. METHODS: A total of 11 head and neck cases, which include 10 recurrent cases and one bilateral case, were selected for the study...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047287/su-f-t-384-step-and-shoot-imrt-vmat-and-autoplan-vmat-nasopharnyx-plan-robustness-to-linear-accelerator-delivery-errors
#19
E M Pogson, C Hansen, S Blake, S Arumugam, L Holloway, D Thwaites
PURPOSE: To identify the robustness of different treatment techniques in respect to simulated linac errors on the dose distribution to the target volume and organs at risk for step and shoot IMRT (ssIMRT), VMAT and Autoplan generated VMAT nasopharynx plans. METHODS: A nasopharynx patient dataset was retrospectively replanned with three different techniques: 7 beam ssIMRT, one arc manual generated VMAT and one arc automatically generated VMAT. Treatment simulated uncertainties: gantry, collimator, MLC field size and MLC shifts, were introduced into these plans at increments of 5,2,1,-1,-2 and -5 (degrees or mm) and recalculated in Pinnacle...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047131/su-g-iep2-14-validation-of-plastimatch-mabs-a-tool-for-automatic-image-segmentation
#20
P Zaffino, P Raudaschl, K Fritscher, M Spadea, G Sharp
PURPOSE: In this work we present the validation of Plastimatch MABS, an open source software for multi atlas based segmentation of medical images. METHODS: The validation was performed on two different clinical datasets: 1) 25 CT image volumes of patients treated for H&N cancer; 2) 20 MRI series of patients having a neurological diagnosis. For the first set, 8 organs at risk to be spared during the therapy were segmented: mandible, brainstem and both left/right optic nerves, parotid and submandibular glands...
June 2016: Medical Physics
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