Improving rectal dosimetry for patients with intermediate and high-risk prostate cancer undergoing combined high-dose-rate brachytherapy and external beam radiotherapy with hydrogel space.

Conclusions: Insertion of HS in prostate cancer patients receiving combined HDR and EBRT is safe and has resulted in a significant radiation dose reduction to the rectum, resulting in significantly less acute GI toxicity and a trend towards less late GI toxicity. PMID: 30911304 [PubMed]
Source: Journal of Contemporary Brachytherapy - Category: Cancer & Oncology Tags: J Contemp Brachytherapy Source Type: research

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CONCLUSIONS: This report confirms that the high-dose regions in the bladder and rectum are more significant predictors of late toxicity and QOL after prostate SABR compared to low-dose regions. Caution must be taken to avoid high doses and hotspots in those organs. PMID: 31809979 [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
Stereotactic body radiation therapy (SBRT) is capable of delivering very large and precise dose of radiation, and has emerged as a primary treatment for low and intermediate risk prostate cancer [1,2]. Accurate imaging and tracking of the target regions allows clinicians to reduce treatment margins and maximally spare rectum, bladder, urethra and penile bulb [3]. However, very sharp dose gradients and the proximity of critical structures to prostate requires precise verification of treatment plans [4,5].
Source: Physica Medica: European Journal of Medical Physics - Category: General Medicine Authors: Tags: Original paper Source Type: research
Abstract While radiotherapy is widely used in cancer treatment, the benefits can be limited by radiation-induced damage to neighboring healthy tissues. We previously demonstrated that the anti-inflammatory compound dimethylaminoparthenolide (DMAPT) selectively induces radiosensitivity in prostate tumor tissue from transgenic adenocarcinoma of mouse prostate (TRAMP), while simultaneously protecting healthy tissues from 6 Gy whole-body radiation-induced apoptosis. Here, we examined the radioprotective effect of DMAPT on fibrosis in normal tissues after a partial-body fractionated radiation protocol that more closely...
Source: Radiation Research - Category: Physics Authors: Tags: Radiat Res Source Type: research
Abstract External beam radiation therapy for prostate cancer can result in urinary, sexual, and rectal side effects, often impairing quality of life. A polyethylene glycol-based product, SpaceOAR© hydrogel (SOH), implanted into the connective tissue between the prostate gland and rectum can significantly reduce the dose received by the rectum and hence risk of rectal toxicity. The optimal way to manage the hydrogel and rectal structures for plan optimization is therefore of interest. In 13 patients, computerized tomography (CT) scans were taken pre- and post-SpaceOAR© implant. A prescription of 60 G...
Source: Journal of Applied Clinical Medical Physics - Category: Physics Authors: Tags: J Appl Clin Med Phys Source Type: research
ConclusionsInter ‐observer contouring variation was significant for multiple pelvic structures contoured on MR.
Source: Journal of Medical Imaging and Radiation Oncology - Category: Radiology Authors: Tags: Radiation Oncology —Original Article Source Type: research
This study seeks to evaluate the quality of the delineation of volumes according to HAS recommendations [1] by showing the existence or not of discrepancies in terms of volumes and the influence on the doses delivered with different treatment planning techniques.
Source: Physica Medica: European Journal of Medical Physics - Category: General Medicine Authors: Source Type: research
ConclusionsDVH parameters and post-radiotherapy HRQoL appear to be closely correlated, underscoring the importance of assessing DVH values prior to initiating EBRT to determine the risk of developing HRQoL related adverse effects. Advanced treatment modalities may be appropriate in high risk cases to minimize treatment-related toxicity and to improve treatment outcomes and HRQoL. Future studies are needed to better elucidate the association between pre-treatment DVH parameters in organs at risk and subsequent HRQoL.
Source: Reports of Practical Oncology and Radiotherapy - Category: Cancer & Oncology Source Type: research
This article investigates dose-volume prediction improvements in a common knowledge-based planning (KBP) method using a Pareto plan database compared with using a conventional, clinical plan database.Methods and materialsTwo plan databases were created using retrospective, anonymized data of 124 volumetric modulated arc therapy (VMAT) prostate cancer patients. The clinical plan database (CPD) contained planning data from each patient’s clinically treated VMAT plan, which were manually optimized by various planners. The multicriteria optimization database (MCOD) contained Pareto-optimal plan data from VMAT plans creat...
Source: Practical Radiation Oncology - Category: Cancer & Oncology Source Type: research
CONCLUSION: Compared to CyberKnife, the RapidArc, volumetric-modulated arc therapy, and noncoplanar intensity-modulated radiotherapy produced treatment plans with similar dosimetric quality, with RapidArc achieving the highest dose conformity. Overall, the dosimetric differences between the studied techniques were marginal, and thus, the choice of the technique should rather focus on the delivery accuracies and dose delivery times. PMID: 28279147 [PubMed - in process]
Source: Technology in Cancer Research and Treatment - Category: Cancer & Oncology Authors: Tags: Technol Cancer Res Treat Source Type: research
Conclusion: Including information from 18F-fluciclovine PET in the treatment-planning process led to significant differences in the defined target volume, with higher doses to the penile bulb but no significant differences in rectal or bladder dose or in acute genitourinary or gastrointestinal toxicity. Longer follow-up is needed to determine the impact of 18F-fluciclovine PET on cancer control and late toxicity endpoints.
Source: Journal of Nuclear Medicine - Category: Nuclear Medicine Authors: Tags: Clinical Source Type: research
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