ESTRO 36 Abstract Book

S1014 ESTRO 36 _______________________________________________________________________________________________

3 Mount Vernon Hospital, Clinical Oncology, Northwood Middlesex, United Kingdom Purpose or Objective The introduction of Stereotactic Ablative Body Radiotherapy (SABR) has led to a rapid change in treatment utilization in elderly patients with early stage non-small cell lung carcinoma (NSCLC). This study aims to investigate the impact of waiting time on lung SABR A consultant radiographer has been appointed to lead our institution’s SABR service since April 2014. The post holder was expected to streamline the patient pathways that still deliver high quality services but in more resourceful and innovative ways including radiographer led target volume delineations and consent. Between 2011 and 2015, 105 NSCLC patients were treated with SABR. A retrospective review was done to determine the relationship between overall survival (OS) and intervals between decision to treat and treatment start date (INT). Medians were used to split the distribution of INT into two groups: below and above median. Survival curves for each group were compared using a log rank test. Similar analysis was undertaken comparing patients who were treated before and after the appointment of the consultant radiographer. Results The median age was 73.9 years (range: 53.0-92.9) and median follow-up was 30.8 months (range: 14.9-74.6). For all patients the median OS was 20.7 months (95%CI: 15.4- 26.0) and INT was 1.0 months (range: 0.1-6.9) respectively. No significant difference in OS was found between the below and above median groups (p=0.46). The median waiting time has been shortened from 1.4 months to 0.6 months (p<0.05) since the joining of the consultant radiographer at our institution although no effect on OS (p= 0.13) is found. Conclusion It’s suggested that the waiting time has been shortened since the appointment of the consultant radiographer. However no significant effect on OS has been seen. This is contrary to published data using conventional radiotherapy. The short overall time for SABR may be compensating for the difference in waiting time to start. The numbers in this study are small and a significant difference may emerge with a larger cohort. EP-1857 Radiotherapy impairs on the bonding system in primary teeth A. Queiroz 1 , T. Mellara 1 , P. Nelson-Filho 1 , J. Arid 1 , J. Romano 1 , H. Oliveira 2 , R. Palma-Dibb 1 1 University of São Paulo - School of Dentistry of Ribeirão Preto, Department of Pediatric Dentistry, RIBEIRAO PRETO, Brazil 2 University of São Paulo - School of Medicine of Ribeirão Preto, Department of Medical Clinics, RIBEIRAO PRETO, Brazil Purpose or Objective When radiotherapy (RT) is performed in the head and neck region, it could lead to structural alteration in enamel and dentin that could influence the behavior of the bonding agents. The present study aimed to evaluate whether the RT interferes in the bonding o two adhesive systems (Clearfil SE Bond e Adper TM Single Bond 2) to enamel (E) and dentin (D) of primary teeth, in different times (before and after RT). Material and Methods Sixty primary molars were cut in a total of 120 fragments of enamel and 120 of dentin, which after the surface polishing were randomly divided into 4 groups (n=30/group): G1 (control) – enamel and dentin without treatment outcomes. Material and Methods

efforts to promote and advertise this website are warranted. EP-1855 Dedicated Patient Information Cancer Websites: A Usability Comparison S. Wall 1 , A. Craig 1 1 Trinity College Dublin, Applied Radiation Therapy Trinity Research Group, Dublin, Ireland Purpose or Objective In recent years, there has been an explosion in the use of websites for acquiring health information. Usability, or the efficiency, effectiveness, and satisfaction users have with websites, determines whether users will return to the site. As information requirements by patients fluctuate over the course of their disease, health information websites must be usable to ensure they consistently meet patient’s information requirements. The purpose of this study was to investigate the usability of one dedicated radiotherapy website, and compare this to 3 other popular patient websites. A secondary aim was to investigate if the websites complied with readability guidelines published by national and international organisations . Material and Methods The data sources for comparison comprised of websites identified from searching the three most used search engines, using keywords reflecting most common language among patients.The LIDA tool, developed for online health information websites, was used to assess the websites for accessibility, usability and reliability. Readability and quality of online written literature was examined using the HSE/NALA Plain Language Style Guide for Documents and“Making Your Website Senior Friendly” guidelines produced by the National Institute of Aging and the National Library of Medicine in the USA. All data collection methods were analysed using descriptive statistics, to allow for comparison between the websites. Results Website A scored 88 out of 141 or 62.41% on the LIDA tool, someway less than the other 3 popular patient websites. Website A scored highly in consistency of layout, search function and website accessibility, but scored less well for reliability (1 out of 27). Other issues identified with Website A included clarity of information and user interaction. In addition,website A had readability issues, with some content written at a level higher than advised by guidelines. This will impede those with low literacy from effectively using the website. Conclusion Website A scored lowest of the four websites as a result of issues relating to the reliability of the website. This issue is easy to address, and acting on recommendations from this research, would bring the website in line with other recognised cancer patient information websites, in relation to usability.It is important to remember that the studied websites, while all related to cancer information, are not directly comparable in that they are not specific to radiotherapy, the size of the organisation, the traffic to the site or the country of the sites origin. However steps can be taken as a result of this study to improve the usability of Website A, allowing for greater empowerment of patients through knowledge acquisition which may ultimately lead to improved clinical outcomes. EP-1856 The impact of waiting time on survival of Lung Stereotactic Ablative Body Radiotherapy patients Y. Tsang 1 , P. Nariyangadu 2 , N. Shah 3 , P. Ostler 3 , P. Hoskin 3 1 Mount Vernon Hospital, Radiotherapy, Northwood Middlesex, United Kingdom 2 Mount Vernon Hospital, Radiotherapy Physics, Northwood Middlesex, United Kingdom