ESTRO 2021 Abstract Book

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ESTRO 2021

respectively. Median OS was 17.2 months. One-year OS, two-year OS and three-year OS were 75%, 38% and 29%, respectively. Patients who underwent resection had a significantly longer median OS compared with non resected patients (38.1 months vs 12.9 months, p < 0.001). The median PFS for resected patients was 22.5 months compared with 6.5 months for non resected patients (p < 0.001).

Conclusion In the management of LAPC, CRT plays a crucial role to improve resectability and clinical outcomes after an accurate pretreatment workup in a multidisciplinary tumor board.

Poster discussions: Poster discussion 33: Miscellaneous

PD-0920 Patients’ preferences on breast cancer side effects communication: implications for a decision aid H. Hasannejadasl 1 , L. Boersma 1 , C. Richel 2 , M. Schuurman 2 , R. Fijten 1 , C. Roumen 1 1 Maastro, Department of Radiation Oncology (Maastro), GROW School for Oncology, Maastricht University Medical Centre+, Maastricht, The Netherlands, Maastricht, The Netherlands; 2 Breast Cancer Foundation Netherlands, Shared decision making, Utrecht, The Netherlands

Purpose or Objective To assess breast cancer patients’ opinion on which side effects are most important to incorporate in a decision

aid for radiation therapy. Materials and Methods

In December 2020, a digital survey was developed, together with the Breast Cancer Association Netherlands (BVN) and sent to (former) breast cancer patients who are part of the B-force panel. The survey consisted of multiple choice and open questions related to demographics, quality of life themes, use of decision aid and risk communication. Results 744 women responded of which 89% (n=664) had had invasive breast cancer, 3% (n=23) had breast cancer in situ and 8% (n=57) had stage four metastasized breast cancer. Mean age was 57.8 ± 9.3 years and average years since diagnosis was 6.9 ± 4.6 years. Of these women, 75% (n=561) had received radiation therapy, of whom 49% (n=274) had discussed the advantages and disadvantages with their physician and 51% (n=287) had not. Education level distribution was low, middle and high in 12%, 31% and 55% of the women, respectively (2% would not say). Quality of life themes that women indicated to value the most were having energy (81%; n=605), usability of arm (61%; n=452), pain (55%; n=410) and the ability to concentrate (48%; n=356). Reasons to choose these themes were primarily related to being independent (69%), being able to do hobbies and sports (55%) and being able to work (53%). Upon investigating the knowledge of decision aids, 54% (n=403) had never heard of a decision aid before, 16% had heard of it, but never used it, 23% knew what it was, but had never used it and 7% had used a decision aid. Women aged >65yrs were less likely to have heard from a decision aid or have used it compared to women