Use Of Intravaginal 17-Beta Estradiol To Improve Sexual Function And Menopausal Symptoms In Postmenopausal Women With Breast Cancer On Aromatase Inhibitors

9610 Background: The majority of women with early stage breast cancer (BC) will become long-term survivors, living with the sequelae of treatment. Attention to symptoms and quality of life (QoL) are therefore of increasing importance both during treatment and survivorship. Aromatase inhibitors (AIs) are used to treat postmenopausal women with hormone-receptor positive (HR+) BC and can lead to profound urogenital atrophy. Atrophic vaginitis in BC survivors is prevalent, its management is complex and it negatively impacts QoL. Methods: A prospective longitudinal IRB-approved study was performed at MSKCC in26 postmenopausal women with stage I-III HR+ BC on adjuvant letrozole or anastrozole for at least 3 months and had urogenital atrophy. All women were initiated on 10µg intravaginal 17-β estradiol. Patients completed the Female Sexual Function Index (FSFI) and Menopausal Symptom Checklist (MSCL) at baseline and wks 12 u0026 24. Increase in FSFI score means better sexual function and a decrease in MSCL score mea...