Ultra-hypofractionated Whole Breast Irradiation With Lumpectomy Cavity Boost for the Treatment of Stage I-III Breast Cancer

This clinical trial tests how well ultra-hypofractionated (UF) whole breast irradiation (WBI) with lumpectomy cavity boost (CB) works in treating patients with stage I-III breast cancer. Breast conservation therapy (BCT) is the recommended treatment for patients with early stage breast cancer. BCT involves a lumpectomy followed by breast radiation. Radiation therapy uses high energy x-rays, particles, or radioactive seeds to kill tumor cells and shrink tumors. Traditionally, WBI has been given once daily over 5-6 weeks and then those at high-risk for recurrence receive additional radiation (boost) to the lumpectomy cavity daily over 4-8 days. This has now been replaced by moderate hypofractionated radiation. Hypofractionated radiation therapy delivers higher doses of radiation therapy over a shorter period of time and may kill more tumor cells and have fewer side effects. Although moderate hypofractionated radiation therapy reduces the length of treatment from 6-7 weeks to 3-4 weeks, the length of treatment still remains a barrier for many patients. UF-WBI with CB delivers radiation to the whole breast and the surgical cavity at the same time over 5 daily treatments. Giving UF-WBI with CB may prevent recurrence and prolong survival as well as improve the quality of life in patients with stage I-III breast cancer.

NCT Number	NCT06954831
Lead Sponsor	City of Hope Medical Center Collaborators: National Cancer Institute (NCI)
Conditions	Anatomic Stage I Breast Cancer AJCC v8, Anatomic Stage II Breast Cancer AJCC v8, Anatomic Stage III Breast Cancer AJCC v8, Breast Carcinoma
Enrollment	82 participants
Start Date	2025-08-28
Primary Completion	2028-01-31 (estimated)
Study Completion	2028-01-31 (estimated)
Updated on ClinicalTrials.gov	2025-10-29