RESUMO
OBJECTIVE: To determine, from the point of view of the oncological patient, who made the decision about their treatment, as well as the major barriers and facilitators that enabled Shared Decision Making to be implemented. MATERIAL AND METHODS: A cross-sectional, descriptive, sand association study using a self-report questionnaire to selected cancer patients, with casual sampling in different oncology clinics and random time periods. A total of 108 patients provided analysable data. The information was collected on sociodemographic and clinical variables, who made the decision about treatment, and level of agreement or disagreement with various barriers and facilitators. RESULTS: More than one-third (38.1%) of patients claimed to have participated in shared decision making with their doctor. Barriers such as, time, the difficulty of understanding, the paternalism, lack of fluid communication, and having preliminary and often erroneous information influenced the involvement in decision-making. However, to have or not have sufficient tools to aid decision making or the patient's interest to participate had no effect. As regards facilitators, physician motivation, their perception of improvement, and the interest of the patient had a positive influence. The exception was the possibility of financial incentives to doctors. CONCLUSIONS: The little, or no participation perceived by cancer patients in decisions about their health makes it necessary to introduce improvements in the health care model to overcome barriers and promote a more participatory attitude in the patient.