Mariken Stegmann

Abstract Purpose: Traditionally, general practitioners (GPs) are not involved in cancer‐related  treatment decisions, despite their often long relationship with patients, and their unique  position to explore patients’ values, especially with older patients. Therefore, we designed a  randomised controlled trial to study the effect, on self‐efficacy related to treatment  decisions, of a conversation about treatment goals between GPs and patients with cancer in  a palliative setting.  Methods: We aim to include 168 patients aged ≥70 years with a diagnosis of non‐curable  cancer, due to consult their oncologist about treatment options. In the intervention group,  patients will consult their GP using an Outcome Prioritisation Tool (OPT). The control group  will receive care as usual. The primary outcome will be the score on a decision self‐efficacy  scale after the consultation with the oncologist. Secondary outcomes will be symptoms of  depression, anxiety, or fatigue. In an embedded observational study of the intervention  group, we aim to assess the prioritisation of treatment goals (i.e., OPT scores),and their  determinants, over a six‐month period.   Conclusions: The OPTion study should provide relevant information about the effect on self‐ efficacy of a consultation between GPs and older patients with cancer, concerning preferred  treatment goals in a palliative setting.  Dutch Trial Register NTR5419 18 Chapter 2