A systematic review of the effectiveness of decision making interventions on increasing perceptions of shared decision making occurring in advanced cancer consultations

To determine how decision making interventions for use in advanced cancer treatment consultations function and whether they increase perceptions of shared decision making (SDM) behaviours within consultations. A systematic search of five literature databases was conducted. Evaluations of decision making interventions where participants faced active treatment decisions for stage 4 or otherwise incurable cancer were included. Intervention descriptions were coded using Behaviour Change Techniques (BCTs) to provide a narrative of how the interventions function. A narrative synthesis of interventions effect on perceptions of SDM behaviours compared to usual care was conducted. Four studies presenting different interventions were included. Education, training, modelling and enablement intervention functions were identified. Oncologist SDM training alone and combined with a patient communication aid demonstrated the only significant effect (p