The most common cancer among women in Sweden is breast cancer. Advances in treatment have improved survival, but these advances have come at a steep price since most treatments impose substantial morbidity and burden on patients and their families. Furthermore, many survivors from cancer have ongoing poor health and well-being and long-term rehabilitation and support should not be neglected to prevent recurrence and increase survival. There are good reasons to believe that routine collection of relevant patient-reported symptoms facilitates person-centered care where the patient is a participatory member of the team. This study aims to pilot-test a supportive and person-centered care intervention in primary healthcare for six months during the first year after primary treatment for breast cancer, assisted by digital technology and compare it to standard care only. The intervention consists of symptom reporting and management in an app in combination with health dialogues with a study-specific nurse at the Primary healthcare centre.