Introduction Systemic therapy with androgen deprivation therapy (ADT) and intensification with agents such as docetaxel, abiraterone acetate and enzalutamide has resulted in improved overall survival in men with de novo synchronous metastatic hormone-sensitive prostate cancer (mHSPC). Novel local cytoreductive treatments and metastasis-directed therapy are now being evaluated. Such interventions may provide added survival benefit or delay the requirement for further systemic agents and associated toxicity but can confer additional harm. Understanding men’s preferences for treatment options in this disease state is crucial for patients, clinicians, carers and future healthcare service providers.Methods Using a prospective, multicentre discrete choice experiment (DCE), we aim to determine the attributes associated with treatment that are most important to men with mHSPC. Furthermore, we plan to determine men’s preferences for, and trade-offs between, the attributes (survival and side effects) of different treatment options including systemic therapy, local cytoreductive approaches (external beam radiotherapy, cytoreductive radical prostatectomy or minimally invasive ablative therapy) and metastases-directed therapies (metastasectomy or stereotactic ablative body radiotherapy). All men with newly diagnosed mHSPC within 4 months of commencing ADT and WHO performance status 0–2 are eligible. Men who have previously consented to a cytoreductive treatment or have developed castrate-resistant disease will be excluded. This study includes a qualitative analysis component, with patients (n=15) and healthcare professionals (n=5), to identify and define the key attributes associated with treatment options that would warrant trade-off evaluation in a DCE. The main phase component planned recruitment is 300 patients over 1 year, commencing in January 2021, with planned study completion in March 2022.Ethics and dissemination Ethical approval was obtained from the Health Research Authority East of England, Cambridgeshire and Hertfordshire Research Ethics Committee (Reference: 20/EE/0194). Project information will be reported on the publicly available Imperial College London website and the Heath Economics Research Unit (HERU website including the HERU Blog). We will use the social media accounts of IP5-MATTER, Imperial Prostate London, HERU and the individual researchers to disseminate key findings following publication. Findings from the study will be presented at national/international conferences and peer-reviewed journals. Authorship policy will follow the recommendations of the International Committee of Medical Journal Editors.Trial registration number NCT04590976.
Acknowledgements We would like to thank all the participants, study PIs, trial clinicians, research nurses, Imperial Clinical Trial Unit staff and other site staff who have been responsible for setting up, recruiting participants and collecting the data for the IP5-MATTER trial. We are also grateful for the ongoing support of the Trial Management Group and our IP5-MATTER patient representatives. Finally, we would like to thank our trial funder the Wellcome Trust and University College London Hospitals (UCLH) Charity.
Funding MJC’s research is support by University College London Hospitals (UCLH) Charity and the Wellcome Trust. Mesfin Genie and Verity Watson are based at the Health Economics Research Unit (HERU), University of Aberdeen. HERU is funded
by the Chief Scientists Office of the Scottish Government Health and Social Care Directorate. KTJ acknowledges research grant from the UK National Institute of Health Research Clinical Research Network Eastern and has received educational grants from Bayer UK, Janssen Oncology, Pfizer, Roche, and Takeda. HUA’s research is supported by core funding from the United Kingdom’s National Institute of Health Research (NIHR) Imperial Biomedical Research Centre.