Background and Objectives: Breast cancer is one of the most common cancers in women that have many effects on psychological health. The purpose of this research was to predict resilience based on cognitive emotion regulation strategies and perceived social support with the mediating role of self-efficacy in breast cancer patients.
Materials and Methods: The present study was descriptive and correlational. The statistical population consisted of all women with breast cancer who had an active case in the oncology departments of Imam Khomeini (RA) and Imam Hossein (AS) Hospitals in Tehran in 2023. Two-hundred and fifty individuals were selected using the convenience sampling method. Data collection tools included the Cognitive Emotion Regulation Questionnaire (CERQ) by Garnefski et al. (2001), the Resilience Scale (RISC) by Connor and Davidson (2003), the Perceived Social Support Scale (MSPSS) by Zimet et al. (1988), and the General Self-Efficacy Scale (GSES) by Scherer et al. (1982). The Pearson’s correlation coefficient and structural equation modeling were used for the statistical analysis of the data.
Results: The findings showed that maladaptive cognitive emotion regulation (β=-0.26, p=0.002), adaptive cognitive emotion regulation (β=0.39, p=0.001), perceived social support (β=0.22, p=0.001), and self-efficacy (β=0.29, p=0.001) have a direct and significant effect on resilience. Cognitive emotion regulation strategies and perceived social support, with the mediation of self-efficacy, explain a total of 43% of the variance in resilience. Additionally, the final research model demonstrated a good fit.
Conclusion: Given the mediating role of self-efficacy in the relationship between cognitive emotion regulation strategies and perceived social support with resilience in women with breast cancer, it is recommended that targeted interventions be implemented to enhance resilience by improving emotion regulation, increasing social support, and strengthening self-efficacy, thereby supporting the mental health of these patients.
Keywords: Resilience, Self-efficacy, Cognitive emotion regulation strategies, Perceived social support, Breast cancer

Funding: This study did not have any funds.
Conflict of interest: None declared.
Ethical considerations: The Ethics Committee of University of Kashan approved the study (IR.KASHANU.REC.1402.040).
Authors’ contributions:
- Conceptualization: Mohammad Reza Tamannaeifar
- Methodology: Mohammad Reza Tamannaeifar
- Data collection: Zahra Suleimanian
- Formal analysis: Zahra Suleimanian
- Supervision: Mohammad Reza Tamannaeifar
- Project administration: Mohammad Reza Tamannaeifar
- Writing – original draft: Mohammad Reza Tamannaeifar, Zahra Suleimanian
- Writing – review & editing: Mohammad Reza Tamannaeifar, Zahra Suleimanian