De-Escalation of Treatment in Women Aged ≥80 Years with Breast Cancer: A Retrospective Analysis from Two Breast Centers.

Background: Breast cancer is frequently diagnosed in older women. However, the impact of surgery on survival is not well studied and prognosis for women ≥ 80 years of age is progressively depending on comorbidities.

Methods: Medical records of consecutive women aged ≥ 80 years diagnosed with primary breast cancer treated with upfront surgery at two Breast Centers from 2011 to 2021 were retrospectively analyzed.

Results: A total of 553 consecutive women with a median age of 83 years and a median tumor diameter of 21 mm were analyzed (574 lesions). Clinical Stages II or III were found in 263/574 (46%) and 101/574 cases (18%), respectively. Axillary staging was completely omitted for 94/542 invasive lesions (17%), and this increased over time from 2% to 33% (p < 0.001). Adjuvant hormone therapy and radiotherapy were omitted in 134/490 (27%) and in 122/420 patients (29%), respectively, while only 26/195 (13%) of patients with a clear clinical indication received adjuvant chemotherapy. At a median follow-up of 61 months (6-147) the 5- and 10-years overall survival (OS) were 64% and 21%, while breast cancer-specific survival (BCSS) at 5 and 10 years were 94% and 78%, respectively. Adjuvant therapies were not associated with a significant improvement in BCSS, while worse OS was associated with older age or more comorbidities as measured by the Charlson Comorbidity Index (CCI) (p < 0.001 and p = 0.012, respectively).

Conclusions: Breast surgery, when possible, has a primary role even for women > 80 years of age, and it is associated with a reasonable BCSS. De-escalation of adjuvant therapies should be considered in this setting because survival is largely determined by age and co-morbidities.