ESTRO 2025 - Abstract Book

S2358

Interdisciplinary – Other

ESTRO 2025

Chapter 5 provides specific considerations and recommendations for the effective use of the ILS in the different medical fields where ionising radiation is used.

Conclusion The publication of the consensus guidelines will support CF's and CA's in fulfilment of their obligations under the BSSD. They will drive a standardised approach to ILS promoting patient safety through event reporting and continuous learning.

Keywords: Incidents, Reporting, Learning

References [1] EU. 2014. Council Directive 2013/59/EURATOM of 5 December 2013 Laying down Basic Safety Standards for Protection against the Dangers Arising from Exposure to Ionising Radiation, and Repealing Directives 89/618/Euratom, 90/641/Euratom, 96/29/Euratom, 97/43/Euratom

1236

Poster Discussion 13 years’ experience of the Dutch Advisory Board “Cancer during pregnancy” (ABCIP-NLs), with a focus on radiation therapy Phil W. Koken 1 , Anna S. Koning 2 , Philip M.P. Poortmans 3,4 , Frederic Amant 5 , Lysanne W. Jonker 1 , Geertjan Van Tienhoven 1 , Menke Weessies 6 , Ingrid A. Boere 7 , Joosje H. Heimovaare 2 , Ingeborg J.H. Vriens 8 , Christianne A.R. Lok 5 1 Dept. of Radiation Oncology, Amsterdam UMC, Amsterdam, Netherlands. 2 Dept. of Gynecologic Oncology, Center Gynecologic Oncology / Netherlands Cancer Institute, Amsterdam, Netherlands. 3 Dept. of Radiation Oncology, Iridium Netwerk, Wilrijk/Antwerp, Belgium. 4 Faculty of Medicine and Health Sciences, University of Antwerp, Wilrijk/Antwerp, Belgium. 5 Dept. of Gynecologic Oncology, University of Leuven, Leuven, Belgium. 6 Radiation Oncology, Maastro, Maastricht, Netherlands. 7 Dept. of Medical Oncology, Erasmus MC Cancer Institute, Rotterdam, Netherlands. 8 Dept. of Internal Medicine, Division of Medical Oncology, Maastricht University Medical Center+, Maastricht, Netherlands Purpose/Objective Cancer is infrequently diagnosed during pregnancy. To overcome challenges in assessing optimal treatment decision-making, a national advisory board (ABCIP-NLs) was established in 2012. Today 47 physicians from 13 disciplines and 2 radiation physicists are involved. Anonymous requests for advice are received electronically. Best available advice is given based on established protocols, literature and group’s expertise ( Amant 2022 ). This overview focuses on cases of cancer during pregnancy in which radiation therapy (RT) was recommended provided that total foetal dose would remain below 100 mSv. Material/Methods All requests are collected in a central database, including patient-, tumour- and pregnancy-related information. These data, along with treatment recommendations from ABCIP-NLs, were analysed. Treatment details, specifically concerning RT, were explored. Results Between December 2012 and September 2024, ABCIP-NLs received 338 requests for advice. The majority concerned patients with breast cancer (n=119), haematological tumours (n=53), cervical cancer (n=40) and melanoma (n=27). Other tumour sites included ovarian (n=17), gastro-intestinal (n=17), sarcoma (n=13), brain (n=12) and others (n=39). Although pregnant cancer patients are advised to be treated as much as possible similarly compared to non pregnant patients, RT was generally recommended to be postponed (if possible) until after childbirth. In 8 out of 40