Abstract: Background: Patients with pancreatic cancer do not feel involved in the development of their treatment and care plans. In Belgium, these plans are decided on during multidisciplinary team meetings. However, limited time is spent on the discussion of the preferences of the patient during these meetings. This research project aims to develop a patient-reported experience measure (PREM) for pancreatic cancer and assess if its use can support collaborative treatment decision-making. Objective: This paper aims to outline the protocol for a multi-method research project to improve person-centered pancreatic cancer care in Belgium. Three subobjectives are pursued: (1) to develop a PREM to assess the experiences of care-related aspects in pancreatic cancer care, (2) to validate the PREM, and (3) to develop and evaluate an educational intervention to support the use of the PREM's results. Methods: For the development of the PREM, an exploratory mixed methods study design will be used. The study will start with a survey followed by a telephone interview involving patients with pancreatic cancer and digestive oncology health care professionals. Study two is the testing of the content and construct validity of the PREM. Study three involves the implementation study according to the Medical Research Council framework of a complex intervention introducing the PREM in practice. The effectiveness of the intervention will be investigated using a pragmatic randomized controlled trial study design. Results: The protocol presents the entire structure of the research project. Ethics approval to conduct the exploratory mixed methods study (objective 1) has been obtained, and recruitment has started since January 2022. Conclusions: The poor prognosis of patients with pancreatic cancer should not be considered a hurdle to not study this patient population group. Involving patients in the research and decision-making processes early on is key. This project aims to realize a scientifically sound research process providing ...