ESTRO 2025 - Abstract Book

S2244

Interdisciplinary – Global health

ESTRO 2025

aims to compare the impact of awareness campaigns conducted in October for breast cancer and September for prostate cancer on internet search trends in Turkey and the most populous countries in Europe. The research presents the first comparative analysis of the effects of awareness campaigns between countries. Material/Methods: Google Trends data from 2018 to 2022 were used to analyze weekly search volumes for breast and prostate cancer in Turkey, Germany, France, the United Kingdom, Italy, and Spain. Searches using keywords like "Breast cancer" and "Prostate cancer" in Turkish and their equivalents in other languages were included. Search volumes were standardized by dividing them by the annual number of internet users in each country, calculating search volumes per user. Multivariate analysis of variance (MANOVA) was applied to evaluate the effect of campaigns. Results: A total of 1,820 data points were analyzed, including 260 from each country. The analysis period overlapped with the COVID-19 pandemic, and a temporary decline in search volumes was observed in early 2020 (Figure 1). Awareness campaigns significantly increased breast cancer search volumes in Italy, France, and the United Kingdom. During the October campaigns, breast cancer searches increased by 0.242 times in Italy, 0.219 times in France, and 0.154 times in the United Kingdom. The strongest impact on breast cancer awareness was observed in Italy, followed by France and the United Kingdom. For prostate cancer, significant increases in search volumes were observed after the September campaigns in Italy (0.359 times), France (0.144 times), and Germany (0.103 times). Conversely, the campaigns in Turkey, the United Kingdom, and Spain did not yield statistically significant effects. The highest increase in prostate cancer awareness was observed in Italy, followed by France and Germany. Conclusion: This study provides an innovative approach to evaluating the impact of cancer awareness campaigns by normalizing Google Trends data. Country-specific internet search trends are valuable indicators of campaign effectiveness. Italy and France showed the strongest responses to both breast and prostate cancer awareness campaigns, with significant increases in public interest. Digital Poster The impact of hypofractionation on radiotherapy CO2 equivalent emissions for a Dutch radiotherapy center using life cycle assessment Erik van der Bijl 1 , Jochem Kaas 1 , Marit Verbeek 2 , René Monshouwer 1 , Hugo R.W. Touw 2 , Tim Stobernack 2 , Johan Bussink 1 1 Department of Radiation Oncology, Radboud University Medical Center, Nijmegen, Netherlands. 2 Department of Intensive Care Medicine, Radboud University Medical Center, Nijmegen, Netherlands Purpose/Objective: Healthcare already accounts for 7% of total greenhouse gas emissions in the Netherlands, with cancer incidence projected to rise immediate emission reduction is a necessity. For radiotherapy an often proposed method to immediately reduce emissions is to increase the use of hypofractionation 1,2 , which not only to reduces per treatment emissions but also allows more efficient use of the existing infrastructure. Material/Methods: Using life cycle assessment (ISO14040/44 using ReCiPe2016) we obtained the CO2 equivalent (CO2e) emissions of stereotactic body radiotherapy (SBRT) for early-stage Non-small Cell Lung Cancer 3 , which has a typical RT workflow of an outpatient visit, CT in thermoplastic mask and subsequently a sequence of treatment fractions. We Keywords: Cancer awareness campaigns, Google trends 3540