Patient Perspectives on the Value of Stereotactic Body Radiotherapy in the Management of Breast Cancer: The PERSPECTIVE Study.

Aims: Oligometastatic disease describes limited metastases amenable to therapy such as stereotactic body radiotherapy (SBRT). This study aims to understand which outcomes are most important to patients when considering SBRT as a treatment option. The insights gained will help inform future patient-directed trial endpoints and provide valuable guidance to clinicians supporting patients through their decision-making process.

Materials and methods: We conducted a qualitative study with focus groups and individual interviews. Participants were recruited using a purposive-sampling matrix accounting for age, presence of metastatic disease, and previous experience with radiotherapy. Each focus group had at least two moderators, and all interviews were digitally recorded and then transcribed. Thematic analysis was performed using NVivo version 12.

Results: The study included 18 patients diagnosed with breast cancer, comprising two focus groups and four individual interviews. The median age was 54 years (range 38-74). 15/18 (83%) had prior radiotherapy experience, including 4/18 with previous SBRT experience. Three main themes were identified: 1) Participants' experience with radiotherapy; 2) patients' perceptions and considerations in relation to SBRT (including desired treatment outcomes); and 3) willingness to consider SBRT for its potential local control and durable pain control benefits, even in the absence of survival benefit. Participants prioritised extending their lives as the foremost desired outcome of SBRT, followed by quality of life. Those with prior SBRT experience were keen for repeat treatment, if available, and emphasised SBRT's minimal side effects compared to other interventions.

Conclusion: While extension of life was the primary desired treatment outcome of SBRT for oligometastatic breast cancer , all participants were willing to consider SBRT for its minimal side effects and potential benefits in local control and durable pain control, even in the absence of a survival benefit.