ESTRO 38 Abstract book

S897 ESTRO 38

Results 131 trainees at different stages of training responded to the survey. The most common method of TVD training for trainees was consultant led (94%) followed by self- directed learning (83%). RT trial protocols were the most common self-directed used tool (89%). Most trainees (54%) report their supervising consultants spend only 1 hour per week reviewing their TVD. 20% of trainees felt highly competent in TVD for a recently completed tumour site, 55% of trainees reasonably confident and 20% insufficiently competent. Most trainees (61%) preferred step-by-step instructions for TVD modules with qualitative feedback for the cases outlined (51%).Trainees testing the model allocated each feedback method a usefulness score out of 10, with the ‘red flag’ tool deemed most useful (mean score 9.2) and over/under contoured regions least useful (mean score 7). Conclusion Given current reliance upon self-directed learning, ARENA aims to support consultant-led TVD teaching through site- specific TVD modules. Software developed for outlining feedback will be further developed to reflect trainee opinion. Further site-specific modules are in development. EP-1667 Safety and efficacy of fiducial marker implantation for robotic SBRT with fiducial tracking N. Scher 1 , G. Bouilhol 1 , R. Tannouri 1 , I. Khemiri 1 , A. Vouillaume 1 , N. Sellami 1 , R. Von Eyben 2 , L. Rotenberg 3 , H. Lamallem 1 , O. Bauduceau 1 , M. Bollet 1 , D. Foster 3 , A. Toledano 1 1 Hartmann Institute of Radiotherapy, Hauts de Seine, Levallois Perret, France ; 2 Stanford Cancer Center, California, Palo Alto, USA ; 3 American Hospital of Paris, Hauts de seine, Neuilly sur seine, France Purpose or Objective The purpose of this study was to assess the feasibility, efficacy and toxicity of fiducial marker implantation and tracking in CyberKnife® stereotactic radiation therapy (SBRT) applied to extracranial locations. Material and Methods This was a retrospective, single-centre, observational study to collect the data of all patients treated by stereotactic radiation therapy with fiducial marker tracking at extracranial locations, conducted between June 2014 and November 2017 at the Hartmann Radiosurgery Institute. Information regarding the implantation procedure, the types of toxicity related to marker implantation and the number of markers implanted/tracked during treatment were collected. Complication rates were evaluated using the CTCAE [Common Terminology Criteria for Adverse Events] scale, version 4. The technical success rate was based on the ability to optimally track the tumour (during translation and/or rotation, depending on the type of target movement) throughout all treatment fractions. Results 2,505 patients were treated by stereotactic radiation therapy, 25% of whom received treatment with fiducial marker tracking. The total number of implantation procedures was 616, and 1,543 fiducial markers were implanted. The implantation-related complication rate was 3%, with 16 Grade 1 events and 4 Grade 2 events. The number of treated patients and the number of implanted markers has gradually increased since the technique was first implemented. The median treatment time was 27 minutes. 1,295 fiducials were actually tracked throughout all treatment fractions, representing a technical success rate of 84%. The difference between the number of fiducials implanted and those tracked during treatment decreased significantly as the site’s experience increased.

Conclusion Fiducial marker implantation and tracking is feasible, well-tolerated, and technically effective technique in SBRT for extracranial tumours. EP-1668 Creation and pilot-test of virtual cases for learning oncologic emergency management Z.S. Fawaz 1 , P. Nancy 1 , J. Alfieri 1 1 McGill University Health Center, Radiation Oncology, Montreal, Canada Purpose or Objective Management of radiation oncologic emergencies becomes critical at the start of the second year of a radiation oncology residency. Considering the limited exposure to oncology in the medical school curriculum, this knowledge gap needs to be filled prior to managing real patients. The aim of this project was to create virtual cases to ease this transition, improve readiness for managing oncologic emergencies on call, and to create viable alternatives to fulfill accreditation standards based on the Association of Faculties of Medicine of Canada (AFMC). Material and Methods A curriculum mapping exercise was done to identify gaps. The main oncologic emergencies that needed to be addressed were selected for development of the modules. Review of the key concepts for management were