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Intraoperative Radiation Therapy in Treating Patients with Breast Cancer Undergoing Breast-Conserving Surgery

Cancer Type
Breast Cancer
Trial Phase
Phase IV
45 Years and older, Female
Study Type
Protocol IDs
117515 (primary)
Study Sponsor
University of California San Francisco


This phase IV trial studies the side effects of intraoperative radiation therapy and how well it works in treating patients with breast cancer undergoing breast-conserving surgery. Delivering radiation one time to the area where the tumor was removed while the patient is still in the operating room may kill any residual tumor cells and may be as effective as standard radiation therapy in patients with early stage breast cancer.


I. To establish eligibility criteria based on previously published trials and studies in order to allow women who meet these criteria to receive intraoperative radiation therapy (IORT) on an Institutional Review Board (IRB)-approved protocol.
II. To systematically collect and assess acute and long-term toxicity and outcomes in larger cohort of patients.
III. To study the efficacy and toxicity of breast radiotherapy given intra-operatively as a single fraction after breast conserving surgery, with or without whole breast radiation, as indicated by pathologic risk factors, in women with early stage breast cancer.
IIIa. In-breast local failure and patterns of in-breast failure.
IIIb. Ipsilateral regional nodal failure.
IIIc. Toxicity and morbidity.
IIId. Relapse-free survival.
IIIe. Overall survival.

Patients undergo IORT in a single fraction over 15-40 minutes at the time of standard of care lumpectomy.

After completion of study treatment, patients are followed up within 6 weeks and then every 6 months for 3 years and yearly for 2 years.


  1. Operable invasive breast cancer
  2. T1 and T2 (< 3.5 cm), N0, M0, confirmed by clinical, cytological or histological examination
  3. Suitable for breast conserving surgery and radiotherapy
  4. Ipsilateral diagnostic mammogram within 12 months of enrollment
**Clinical trials are research studies that involve people. These studies test new ways to prevent, detect, diagnose, or treat diseases. People who take part in cancer clinical trials have an opportunity to contribute to scientists’ knowledge about cancer and to help in the development of improved cancer treatments. They also receive state-of-the-art care from cancer experts... Click here to learn more about clinical trials.