Ultra-hypofractionated Whole Breast Irradiation With Lumpectomy Cavity Boost for the Treatment of Stage I-III 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(7 sites)
United States
City of Hope at Arcadia, Arcadia, California City of Hope Medical Center, Duarte, California City of Hope at Irvine Lennar, Irvine, California City of Hope Antelope Valley, Lancaster, California City of Hope South Pasadena, South Pasadena, California City of Hope at South Bay, Torrance, California City of Hope Upland, Upland, California Last updated October 2025