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Hypofractionated Partial Breast Irradiation in Treating Patients with Early Stage Breast Cancer

Cancer Type
Breast Cancer
Trial Phase
Phase II
Phase III
50 Years and older, Female
Study Type
Protocol IDs
2016-1035 (primary)
Study Sponsor
M D Anderson Cancer Center


This phase II/III trial studies how well hypofractionated partial breast irradiation works in treating patients with early stage breast cancer. 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. Treating only the part of the breast where the cancer started may lead to fewer side effects than standard treatment.


I. The risk of grade 2 or higher toxicity occurring during radiation and through the 6 month post-radiation follow up visit in patients treated with Optimizing Preventative Adjuvant Linac-based Radiation (OPAL) regimen.

I. To measure patient-reported cosmetic outcome, functional status, and breast pain with the OPAL regimen at 6 months, one year, two years, three years, four years, and five years after completing the OPAL regimen.
II. To measure physician-reported and photographically-assessed cosmetic outcome at 6 months, one year, two years, three years, four years, and five years after completing the OPAL regimen and to compare this to the best performing arm of 2010-0559.
III. To determine the 5-year risk of pathologically-confirmed invasive and/or in situ ipsilateral breast tumor recurrence (IBTR) for patients with ductal breast carcinoma in situ (DCIS) and early invasive breast cancer.
IV. To determine the 5-year risk of any recurrence of breast cancer, disease-free survival, and overall survival.
V. To determine maximal late (within 5 years) toxicities using the National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) version (v) 4.0 scale.
VI. To establish the feasibility of conducting multi-center radiation therapy trials within the MD Anderson Network.

OUTLINE: Patients are randomized to 1 of 2 arms.

ARM I: Patients undergo hypofractionated partial breast irradiation daily for 10 days. Patients may then receive 3 additional boost fractions at the discretion of the doctor.

ARM II: Patients undergo standard breast irradiation daily for 15 days. Patients may then receive 5 additional boost fractions at the discretion of the doctor.

After completion of study treatment, patients are followed up at 6 months, and at 1.5, 3.5, and 5.5 years.


  1. Diagnosis of pathologically-confirmed invasive breast cancer or ductal carcinoma in situ
  2. Pathologic T stage of Tis, T1, or T2 with total size of tumor =< 3 cm (this size criteria applies to both pure DCIS and invasive tumors)
  3. For patients with invasive breast cancer, pathologic N stage of N0, N0 (i-), or N0 (i+); pathologic staging of the axilla is not required for patients with pure DCIS
  4. Treatment with breast conserving surgery
  5. Unifocal primary tumor based on imaging and clinical assessment; microscopic multifocality is allowed
  6. Final surgical margins negative defined as no tumor on ink; lobular carcinoma in situ involving the final surgical margin will be disregarded
  7. For invasive cancers, the tumor must be estrogen receptor positive (defined as 10% or greater expression of estrogen receptor)
  8. If the patient has a history of a prior non-breast cancer, all treatment for this cancer must have been completed at least one month prior to study registration and the patient must have no evidence of disease for this prior non-breast cancer
  9. Patients must be enrolled on the trial within 12 weeks of the later of two dates: the final breast conserving surgical procedure or administration of the last cycle of cytotoxic chemotherapy
  10. Final criteria for eligibility established after simulation: The tumor bed can be readily visualized on simulation computed tomography (CT) and is localized to one quadrant or region of the breast that is amenable to partial breast irradiation
**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.
Georgia CORE


Advancing Cancer Care through Partnerships and Innovation

Georgia CORE is a statewide nonprofit that leverages partnerships and innovation to attract more clinical trials, increase research, and promote education and early detection to improve cancer care for Georgians in rural, urban, and suburban communities across the state.