(BMJ) Researchers have found a possible association between radiotherapy for the treatment of prostate cancer and an increased risk of developing secondary cancers of the bladder, colorectal tract, and rectum. Their study is published in The BMJ today.
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…
BACKGROUND: For conventional radiotherapy treatment units, automated planning can significantly improve plan quality. For robotic radiosurgery, systems for automatic generation of clinically deliverable plans do not yet exist. For prostate stereotactic body radiation therapy (SBRT), few studies have systematically compared VMAT with robotic treatment.
MATERIAL AND METHODS: The multi-criteria autoplanning optimizer, developed at our institute, was coupled to the commercial treatment planning system of our robotic treatment unit, for fully automated generation of clinically deliverable plans (autoROBOT…
BACKGROUND AND PURPOSE: Reported plan quality improvements with autoplanning of radiotherapy of the prostate and seminal vesicles are poor. A system for automated multi-criterial planning has been validated for this treatment in a large international multi-center study. The system is configured with training plans using a mechanism that strives for quality improvements relative to those plans.
MATERIAL AND METHODS: Each of the four participating centers included thirty manually generated clinical Volumetric Modulated Arc Therapy prostate plans (manVMAT). Ten plans were used for autoplanning training….
a Garza-Salazar J, Castro-Eguiluz D, Meneses-García A
Mexico has seen an increase in cancer prevalence in its entire population as well as particular age ranges, predominantly the older segment. The most frequently reported pelvic cancers in Mexico are cervical, endometrial, bladder, prostate, rectum, and anal canal. Approximately 80% of the population diagnosed with pelvic cancers present with locally advanced tumors and require concomitant chemoradiotherapy, sequential chemoradiotherapy, or radiotherapy alone. The toxicity of any of these treatment modalities may be manifested as intestinal injur…
CONCLUSION: The planned dose escalation was not received by more than half-of-the patients. Robustness of the prostate target (CTV67.5) should therefore be better prioritized in these patients given the low toxicity profile. Estimates of delivered dose were less conservative for dose-accumulation due to interaction of random organ motion with the dose matrix.
PMID: 29941300 [PubMed – as supplied by publisher]
CONCLUSION: We established the relationships between the geometric anatomical characteristics of the patients and the corresponding planning 3D dose distribution via feed-forward back-propagation neural network in patients receiving IMRT/SBRT for the same tumor site. The proposed model provides individualized quality standards for automatic plan quality control.
PMID: 29997090 [PubMed – in process]
This study characterizes the exclusion of patients with chronic kidney disease (CKD) in randomized clinical trials of drug treatment for bladder, breast, colorectal, lung, and prostate cancer.
Conclusion: The impacts of cancer in Taiwan are very large. Future studies must consider both quality of life and the entire impact from societal perspectives.
PMID: 29872347 [PubMed]
This study’s purpose is to develop and evaluate an automated method for adaptation of IMPT plans in near real-time to the anatomy of the day. We developed an automated treatment plan adaptation method using (1) a restoration of spot positions (Bragg peaks) by adapting the energies to the new water equivalent path lengths; and (2) a spot addition to fully cover the target of the day, followed by a fast Reference Point Method optimization of the spot weights resulting in a Pareto optimal plan for the daily anatomy. The method was developed and evaluated using 8-10 repeat CT scans of 11 prostate cancer patients, prescrib…
PURPOSE/OBJECTIVE: Assess to what extent the use of automated treatment planning would have reduced organ-at-risk dose delivery observed in the randomized HYPRO trial for prostate cancer, and estimate related toxicity reductions. Investigate to what extent improved plan quality for hypofractionation scheme as achieved with automated planning can potentially reduce observed enhanced toxicity for the investigated hypofractionation scheme to levels observed for conventional fractionation scheme.
MATERIAL/METHODS: For 725 trial patients, VMAT plans were generated with an algorithm for automated multi-cri…