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Introduction Breast cancer treatment in elderly patients is controversial. This single-centre study was conducted to review the treatment and outcomes for octogenarian women treated for breast cancer. Methods Data from all patients aged 80 years or more with primary breast cancer treated at our institution between 1995 and 2012 were included. Patients with carcinoma in-situ (stage 0) and advanced breast cancer (stage IV) were excluded. Results The study population consisted of 369 patients (median age 84 years). A total of 277 (75%) patients underwent surgical treatment (PST) and 92 (25%) received primary endocrine treatment (PET). Prognostic factors (HER-2, tumour grade, lymphovascular invasion and subsequent adjuvant therapy) were homogeneously distributed in both groups. PST and PET were stratified according to stage: 273 (66%) patients with early stage disease (I, IIA, IIB) and 96 (34%) with locally advanced disease (IIIA, IIIB, IIIC). Patients were followed-up for a median of 63 months. In patients with early stage disease, the mean breast cancer-specific survival (BCSS) was 109 months (95% CI = 101–115) in PST patients, and 50 months (95% CI = 40–60) in PET patients (P < 0.01). Conversely, for patients with locally advanced breast cancer, there was no significant difference in BCSS between the surgical and non-surgical groups. In the PST group, BCSS and disease-free survival were significantly better among patients who underwent standard surgical treatment than among those who received suboptimal treatment. There were no differences in the Charlson comorbidity index scores between the PST and PET groups. Conclusion In women ≥80 years with early-stage breast cancer, standard surgical treatment was associated with a better BCSS when compared with PET. [ABSTRACT FROM AUTHOR]