Using the Edmonton Symptom Assessment System (ESAS) to Describe Symptom Burden Associated with Breast Cancer and Related Treatments: A Cross-Sectional Study

<b>Background:</b> Symptom burden and functional impairment are common in women with breast cancer, yet their prevalence and clinical significance across the disease spectrum remain underexplored. We sought to describe symptom burden and performance status using patient-reported outcome measures and to identify patient characteristics associated with symptoms requiring clinical intervention. <b>Methods:</b> In this cross-sectional study, women with stage I-IV breast cancer completed the Edmonton Symptom Assessment System (ESAS) and the Patient-Reported Functional Status tool. We assessed the prevalence and severity of symptoms and calculated summary distress scores. Multivariable logistic regression was used to identify patient characteristics associated with clinically significant symptoms (ESAS ≥ 4). <b>Results:</b> Among 381 women (mean age 56.8 years; 27% metastatic; 72% with no comorbidities), 70% reported at least one moderate to severe symptom. The most common were tiredness (31%), lack of well-being (30%), and anxiety (21%). Mean summary distress scores were low overall. Most patients reported functional status scores of 0 or 1, and 43% of those with scores ≥2 had metastatic disease. Compared with metastatic patients, women within the first year after diagnosis were less likely to report a symptom requiring intervention (OR 0.49, 95% CI 0.24-0.90). <b>Conclusions:</b> Clinically significant symptoms are common among women with breast cancer, including those with potentially curable disease. Threshold-based use of ESAS, rather than reliance on mean scores, provides a more accurate assessment of patient needs. These findings support the routine integration of patient-reported outcomes into oncology care and underscore the importance of targeted multidisciplinary interventions.