Patient-Reported Outcomes (PRO) are directly reported by the patient without interpretation of the patient's response by a clinician or anyone else and pertains to the patient's health, quality of life, or functional status associated with health care or treatment. It can provide patients’ perspectives regarding treatment benefit and harm, directly measure treatment benefit and harm beyond survival, and are often the outcomes of most importance to patients. This study aims to analyze outcomes reported by Brazilian women diagnosed with breast cancer and rank the most important attributes for these patients.

Observational study composed of interviews and questionnaires applied to a convenience sample of women diagnosed with breast cancer. The instruments were developed taking into account the literature on the topic and the expertise of specialists. The questionnaire was built with close-ended questions using multiple-choice and a Likert scale, in order to rank the attributes and outcomes found in the interviews.

The total sample was composed of 65 women diagnosed with breast cancer. Twelve women were interviewed, in September 2020, to explore the main outcomes and preferences about their treatments, such as the most common side effects and the most impacted aspects of life after diagnosis and breast cancer treatment. Psychological, emotional, and sexual impacts were frequently described as aspects of life affected by the disease and its treatment. Fifty-three women, from all the five Brazilian regions, answered the survey applied in October and November 2020. Following an order of importance ranking, the following outcomes were chosen, respectively: overall survival, progression-free survival; and quality of life. The treatment effects that were considered less important, among this sample, were pain and adverse events.

Thinking about expanding the therapeutic quality of users, it is essential to take into account the experiences of patients. PRO is a trend in current research to achieve this goal, in order to influence the decisions of HTA agencies about the importance of valuing outcomes that affect patients' lives.