Geometric and dosimetric impact of anatomical changes for MR-only radiation therapy for the prostate.

CONCLUSIONS: Variations in the bladder and rectal volume can significantly dislocate the prostate and OARs, which can negatively impact the dose delivered to these organs. This warrants proper preparation of patients during treatment and imaging sessions, especially when imaging required longer scan times such as MR protocols. PMID: 30821881 [PubMed - as supplied by publisher]
Source: Journal of Applied Clinical Medical Physics - Category: Physics Authors: Tags: J Appl Clin Med Phys Source Type: research

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Abstract BACKGROUND: Manual volumetric modulated arc therapy (VMAT) treatment planning for high-risk prostate cancer receiving whole pelvic radiotherapy (WPRT) with four integrated dose levels is complex and time consuming. We have investigated if the radiotherapy planning process and plan quality can be improved using a well-tuned model developed through a commercial system for knowledge-based planning (KBP). MATERIAL AND METHODS: Treatment plans from 69 patients treated for high-risk prostate cancer with manually planned VMAT were used to develop an initial KBP model (RapidPlan, RP). Prescribed doses were 5...
Source: Acta Oncologica - Category: Cancer & Oncology Authors: Tags: Acta Oncol Source Type: research
We report the ESTRO-ACROP (European Society for Radiotherapy and Oncology - Advisory Committee on Radiation Oncology Practice) recommendations for performing IORT in primary locally advanced rectal cancer. PMID: 33005755 [PubMed]
Source: Clinical Prostate Cancer - Category: Cancer & Oncology Authors: Tags: Clin Transl Radiat Oncol Source Type: research
AbstractDosimetric evaluation and variation assessment were performed with two knowledge-based planning (KBP) models created at different periods for volumetric-modulated arc therapy (VMAT) for prostate cancer at five institutes. The first and second models (F- and S-models) for KBP were created before April 2017 and April 2019, respectively. The S-model was created using feedback plans from the F-model. Dose evaluation was compared between the two models using the same two computed tomography (CT) datasets and structures. The evaluation metrics were the dose received by 95.0% and 2.0% of the planning target volume (PTV); ...
Source: Radiological Physics and Technology - Category: Physics Source Type: research
In conclusion, the present study indicated that RRBP1 was associated with bladder cancer migration, invasion and prognosis, and CCR7 might serve a role in the process. PMID: 32963609 [PubMed]
Source: Oncology Letters - Category: Cancer & Oncology Tags: Oncol Lett Source Type: research
Obtaining accurate segmentation of the prostate and nearby organs at risk (e.g., bladder and rectum) in CT images is critical for radiotherapy of prostate cancer. Currently, the leading automatic segmentation algorithms are based on Fully Convolutional Networks (FCNs), which achieve remarkable performance but usually need large-scale datasets with high-quality voxel-wise annotations for full supervision of the training. Unfortunately, such annotations are difficult to acquire, which becomes a bottleneck to build accurate segmentation models in real clinical applications. In this paper, we propose a novel weakly supervised ...
Source: IEEE Transactions on Biomedical Engineering - Category: Biomedical Engineering Source Type: research
CONCLUSION: MR-guided daily-adaptive SBRT seems a feasible and accurate strategy for treating prostate cancer with ablative doses. IGRT with the use of fiducials provides a comparable level of accuracy and acceptable real-dose distribution over treatment fractions. Future study will provide additional data regarding the tolerability and the clinical outcome of this new technological approach. PMID: 32945701 [PubMed - as supplied by publisher]
Source: Acta Oncologica - Category: Cancer & Oncology Authors: Tags: Acta Oncol Source Type: research
DB Nandini, Roopa S Rao, BS Deepak, Praveen B ReddyJournal of Oral and Maxillofacial Pathology 2020 24(2):405-405 Isothicyanates present in cruciferous vegetables are known to exhibit chemoprevention by various mechanisms. Presently, there is growing evidence that a phytochemical compound known as sulforaphane in these green leafy vegetables is found to be effective in preventing and treating various cancers such as prostate cancer, breast cancer, colon cancer, skin, urinary bladder and oral cancers. This component is naturally present in the broccoli sprouts, kale, cabbage, cauliflower and garden cress and is available a...
Source: Journal of Oral and Maxillofacial Pathology - Category: ENT & OMF Authors: Source Type: research
We describe the landscape of cyclin and interactive gene pathway alterations in 190,247 solid tumors. METHODS: Using comprehensive genomic profiling (315 genes,>500× coverage), samples were analyzed for alterations in activating/sensitizing cyclin genes (CDK4 amplification, CDK6 amplification, CCND1, CCND2, CCND3, CDKN2B [loss], CDKN2A [loss], SMARCB1), hormone genes (estrogen receptor 1 [ESR1], androgen receptor [AR]), and co-alterations in genes leading to cyclin inhibitor therapeutic resistance (RB1 and CCNE1). RESULTS: Alterations in at least one cyclin activating/sensitizing gene occurred in 24% of ...
Source: The Oncologist - Category: Cancer & Oncology Authors: Tags: Oncologist Source Type: research
CONCLUSION: There are multiple overlapping psychosocial and healthcare system barriers to sexual recovery after prostate, bladder, and colorectal cancer treatment. Oncological providers must be cognizant of these complex barriers so they can facilitate patients' access to resources needed for successful sexual recovery after genitourinary cancer treatment. Evidence based interventions, such as couple psychosexual counseling and peer support should be implemented via multidisciplinary care. PMID: 32868190 [PubMed - as supplied by publisher]
Source: Urologic Oncology - Category: Urology & Nephrology Authors: Tags: Urol Oncol Source Type: research
CONCLUSION: Both MLC tracking and gating were effective strategies at improving the accuracy of the dose delivered to the target and organs at risk. While dosimetric performance was comparable, gating resulted in interruptions to treatment. CLINICAL TRIAL REGISTRATION NUMBER: NCT02397317. PMID: 32828839 [PubMed - as supplied by publisher]
Source: Radiotherapy and Oncology : journal of the European Society for Therapeutic Radiology and Oncology - Category: Radiology Authors: Tags: Radiother Oncol Source Type: research
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