Key clinical point: Vaginal estrogen therapy (VET) or menopausal hormone therapy (MHT) did not increase the risk for recurrence/mortality in postmenopausal women with early-stage, estrogen receptor-positive (ER+) BC; however, the recurrence risk was higher in patients receiving aromatase inhibitors (AI)+VET.
Major finding: The recurrence risk among women receiving VET (adjusted hazard ratio [aHR] 1.08; 95% CI 0.89-1.32) or MHT (aHR 1.05; 95% CI 0.62-1.78) was similar to that among never-users of hormone therapy; however, the risk was elevated in patients receiving VET+AI (aHR 1.39; 95% CI 1.04-1.85). Neither VET (aHR 0.78; 95% CI 0.71-0.87) nor MHT (aHR 0.94; 95% CI 0.70-1.26) was associated with increased overall mortality, irrespective of the receipt of AI.
Study details : Findings are from an observational cohort study including 8461 postmenopausal women with early-stage, invasive, nonmetastatic, ER+ BC who received no endocrine treatment or 5-year adjuvant endocrine therapy.
Disclosures: This study was supported by Breast Friends, a part of the Danish Cancer Society. Some authors declared receiving support, honoraria, or institutional grants from several sources.
Source: Cold S et al. Systemic or vaginal hormone therapy after early breast cancer: A Danish observational cohort study. J Natl Cancer Inst. 2022 (Jul 20). Doi: 10.1093/jnci/djac112