(Z)-Endoxifen for the Treatment of Premenopausal Women With ER+/HER2- Breast Cancer — StellaPhase 2 — Testing in a larger group (up to a few hundred people) to further evaluate safety and begin to assess effectiveness.
Trial locations(15 sites)
United States
Mayo Clinic Arizona, Phoenix, Arizona University of Arizona, Tucson, Arizona California Research Institute, Los Angeles, California Mayo Clinic Florida, Jacksonville, Florida Northwestern University, Chicago, Illinois Last updated October 2025