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Radiation Therapy With or Without Trastuzumab in Treating Women With Ductal Carcinoma In Situ Who Have Undergone Lumpectomy

RATIONALE: Monoclonal antibodies, such as trastuzumab, can block tumor growth in different ways. Some block the ability of tumor cells to grow and spread. Others find tumor cells and help kill them or carry tumor-killing substances to them. Radiation therapy uses high-energy x-rays to kill tumor cells. It is not yet known whether radiation therapy is more effective with or without trastuzumab in treating ductal carcinoma in situ.

PURPOSE: This randomized phase III trial is studying radiation therapy to see how well it works compared with or without trastuzumab in treating women with ductal carcinoma in situ who have undergone lumpectomy.

OUTLINE: Patients are randomized to 1 of 2 treatment arms.

  • Arm I: Patients undergo standard whole breast irradiation (WBI) over 5-6 weeks.
  • Arm II: Patients receive trastuzumab (Herceptin®) IV over 30-90 minutes once in weeks 1 and 4. Patients also undergo WBI as in arm I.

After completion of study therapy, patients are followed every 6 months for 5 years and then every 12 months for 5 years.

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