Saeedeh Alizadeh - MSc in Midwifery Consultation, Student Research Committee, Urmia University of Medical Sciences, Urmia, Iran.
Fatemeh Moghaddam Tabrizi - Associate Professor in Nursing and Midwifery Department, Reproductive Health Research Center , Urmia University Of Medical Sciences , Urmia, Iran.
Shahriar Khanahmadi - Medical Student, Faculty of Medicine, Student Research Committee, Urmia University of Medical Sciences, Urmia, Iran.
Samira Barjasteh - Ph.D Student in Reproductive Health, Nursing and Midwifery School, Tehran University of Medical Sciences, Tehran, Iran

Introduction & Aim: Family plays an important role in the health of breast cancer patients and improves their self-efficacy. The aim of this study was to determine the effectiveness of a family-based intervention program on the managerial self-efficacy associated with chemotherapy symptoms in women with breast cancer referred to the educational centers of Urmia in 2016. Methods: In this clinical trial study conducted on 60 patients, convenience sampling was done and all patients were randomly assigned into two intervention and control groups. The intervention included implementing family-based intervention on the managerial self-efficacy associated with chemotherapy symptoms in breast cancer patients. The data collection instruments were demographic questionnaire and SMSES-BC questionnaire. Results: The results indicated a significant difference between the mean score of problem-solving subscale, management of symptoms related to chemotherapy, management of emotional and interpersonal disturbance and total score of the managerial self-efficacy associated with chemotherapy symptoms in the post-test intervention group (P< 0.001). owever, no significant difference was found in the control group. Conclusion: The results showed that intervention program based on family support led to an increase in the managerial self-efficacy associated with chemotherapy symptoms in patients with breast cancer.