- Conditions
- Breast Carcinoma In Situ, Breast Ductal Carcinoma In Situ, Breast Lobular Carcinoma In Situ, Stage I Breast Cancer AJCC v7, Stage IA Breast Cancer AJCC v7, Stage IB Breast Cancer AJCC v7, Stage II Breast Cancer AJCC v6 and v7, Stage IIA Breast Cancer AJCC v6 and v7, Stage IIB Breast Cancer AJCC v6 and v7, Stage III Breast Cancer AJCC v7, Stage IIIA Breast Cancer AJCC v7, Stage IIIB Breast Cancer AJCC v7, Stage IIIC Breast Cancer AJCC v7
- Interventions
- Endoxifen Hydrochloride, Placebo Administration, Questionnaire Administration
- Drug · Other
- Lead sponsor
- National Cancer Institute (NCI)
- NIH
- Eligibility
- 18 Years and older · Female only
- Enrollment
- 32 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2018 – 2026
- U.S. locations
- 3
- States / cities
- Los Angeles, California • Chicago, Illinois • New York, New York
Source: ClinicalTrials.gov public record
Updated May 3, 2026 · Synced May 21, 2026, 11:10 PM EDT