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Brief Title: Estradiol Plus Olaparib for Breast Cancer (PHOEBE)
Official Title: Phase 1b Study of Olaparib and Estradiol in Advanced ER+ Breast Cancer (PHOEBE)
Study ID: NCT05900895
Brief Summary: Determine the safety and recommended Phase II dose of olaparib in combination with 17b-estradiol in post-menopausal patients with advanced ER+/HER2- breast cancer.
Detailed Description: Patients with endocrine-resistant ER+/HER2- breast cancer are eligible. Patients will be treated with the combination of 17b-estradiol and olaparib for 2 cycles, and then treated with single-agent 17b-estradiol until disease progression. Clinical benefit, progression-free survival, objective response, tumor metabolic response, and toxicity will be determined.
Minimum Age: 18 Years
Eligible Ages: ADULT, OLDER_ADULT
Sex: FEMALE
Healthy Volunteers: No
Name: Mary Chamberlin, MD
Affiliation: Dartmouth-Hitchcock Medical Center
Role: PRINCIPAL_INVESTIGATOR