ESTRO 2025 - Abstract Book

S2381

Interdisciplinary – Other

ESTRO 2025

Purpose/Objective Shared decision-making (SDM) is a collaborative approach that empowers patients by integrating their preferences with clinical expertise, leading to improved patient satisfaction, treatment adherence, and health outcomes. However, its adoption in oncology is hindered by communication challenges and uncertainty. To effectively implement SDM in oncology and ensure smooth data collection a high response rates we want to determine which SDM tool is best suited to clinical practice. Existing questionnaires, often developed for research purposes, may not be optimal for use in busy clinical settings. This study compares three SDM measurement tools—SDM-Q-9, CollaboRATE, and iSHARE—assessing ease of use, completion time, need for support, and patient satisfaction. Material/Methods A cross-sectional randomized trial was conducted at radiation oncology clinic Maastro (August 2021–March 2022) with 159 newly referred cancer patients considering radiotherapy. Participants were randomized to complete one of three SDM questionnaires listed in table 1. Completion time and frequencies of assistance were recorded. Post completion, satisfaction in ease, time, and support was assessed using the After Scenario Questionnaire (ASQ, 7 point Likert scale). Qualitative analysis of audio recordings made during the completion of the SDM and ASQ questionnaires captured spontaneous patient feedback regarding their experiences and perceptions.

Results 159 patients (64.2% female;35.8% male) with breast (37.1%), lung (13.8%), gastroenterology (13.2%), and urology (13.8%) tumors participated. CollaboRATE had the shortest completion time (avg. 52 seconds), followed by SDM-Q9 (2:17 minutes) and iSHARE (3:46 minutes). CollaboRATE received the most favorable scores for ease (71.2% avg. 1.60) and support (86.8% avg. 1.17), while SDM-Q9 was rated most efficient for time (94.2% avg. 1.06). iSHARE showed less favorable results for ease (62.3% avg. 1.94) and time (84.9% avg. 1.23). However, these differences were not significant (Ease p=0.314; Time p=0.150; Support p=0.655 Table 2). The qualitative analysis revealed patient challenges related to accidentally skipping questions (SDM-Q9 N=16; iSHARE N=13), not being aware that there was a choice (SDM-Q9 N=15; iSHARE N=14). Additionally, iSHARE showed the highest instances of needing help (N=16) and particularly in iSHARE, patients found the questions irrelevant to their situation (N=10).