Purpose: This study aimed to identify key aspects of health-related quality of life in women with locally advanced breast cancer (LABC) and analyse their links to factors and treatment modalities.

Method: A cross-sectional study was conducted from August to October 2023 in Ulin Regional Public Hospital, Banjarmasin, Indonesia, involving LABC women whose quality of life (QoL) was assessed using Quality-of-Life Questionnaire Breast Cancer 23. Data were analysed using ANOVA, independent t-tests for parametric data, Kruskal-Wallis and Mann-Whitney tests for non-parametric data and significant variables (p < 0.05) included in a final regression model for identifying predictors.

Results: Of 100 participants (mean age 50 years), most had low education levels (41%), were unemployed (74%) and had stage IIIB cancer. Body image score was the highest, while systemic therapy side effect was the lowest. Better sexual enjoyment was reported in post-menopausal women (p = 0.043), those with higher education (p = 0.036) and married individuals (p = 0.021). Higher economic status was associated with better sexual enjoyment (p = 0.008) and fewer breast symptoms (p = 0.011); however, economic status was negatively associated with employment status (p = 0.043). Worsening arm symptoms were associated with prolonged illness (p = 0.022). Surgical intervention was associated with higher body image (p = 0.010) and lower systemic side effects (p = 0.023). Traditional medicine was associated with lower arm symptoms (p = 0.026). Economic/occupational status explained 10.5% of sexual functioning scores.

Conclusion: Poor QoL in LABC patients overall was associated with low sociodemographic conditions, late presentation and chemotherapy-related side effects.