Background: Breast Cancer can be disturbed for health and psychological. Breast cancer has reached the second deadly disease. Causative factors include age, marital status, use of hormonal contraception, history of breastfeeding, family history, family support, self-acceptance, stress levels, and breast selfexam knowledge. This study aimed to investigate the factors predisposing and reinforcing breast cancer incidence in Samarinda, East Kalimantan. Subject and Method: This was a cross-sectional study conducted in Samarinda, East Kalimantan. A total of 216 samples by using accidental sampling were selected for this study. The dependent variable was the incidence of breast cancer. The independent variables were education, marital status, use of hormonal contraception, history of breastfeeding, family history, family support, self-acceptance, stress levels, and breast self-exam knowledge. The data were collected by questionnaire via a google form. Data analysis using Chi-Square test. Results: The significant risk factors of breast cancer were education, marital status, hormonal contraception, history of breastfeeding, stress conditions, and self-acceptance. Family history and family support, and breast self-exam knowledge were insignificantly associate with the risk of breast cancer.
Conclusion:The significant risk factors of breast cancer are education, marital status, hormonal contraception, history of breastfeeding, stress conditions, and self-acceptance. Family history and family support, and breast self-exam knowledge are insignificantly associate with the risk of breast cancer.