Radiation Therapy in Treating Women With Early Stage Breast Cancer

This is an interventional treatment trial for Breast Cancer focused on measuring ductal breast carcinoma in situ, invasive ductal breast carcinoma, invasive lobular breast carcinoma, medullary ductal breast carcinoma with lymphocytic infiltrate, mucinous ductal breast carcinoma, papillary ductal breast carcinoma, tubular ductal breast carcinoma, stage I breast cancer, stage II breast cancer, stage IIIA breast cancer Read More

DISEASE CHARACTERISTICS:

• Histologically confirmed breast cancer, including 1 of the following subtypes:

  • Ductal carcinoma in situ
  • Invasive ductal carcinoma
  • Invasive lobular carcinoma
  • Medullary carcinoma
  • Papillary carcinoma
  • Colloidal (mucinous) carcinoma
  • Tubular carcinoma

• Pathological stage 0-IIIA disease (pTis; pT1-2, N0-N2a, M0)

  • Tumor size ≤ 5 cm
• Breast considered technically satisfactory for radiotherapy

• Has undergone lumpectomy or mastectomy and either sentinel node biopsy or axillary dissection (if invasive carcinoma is present)

  • Negative inked histological margins (i.e., no invasive cells at surgical margin) or confirmed negative re-excision specimen
• Unifocal or multifocal (confined to 1 quadrant; tumors < 4 cm apart) disease with 1 or 2 foci that can be encompassed by 1 lumpectomy
• No proven multicentric carcinoma (tumors in different quadrants of the breast or tumor separated by ≥ 4 cm) with other clinically or radiographically suspicious areas in the ipsilateral breast unless confirmed to be negative for malignancy by biopsy

• No evidence of suspicious microcalcifications in the breast before the start of radiotherapy

  • If malignancy-associated microcalcifications were initially present, the post-excision mammography must be negative
• No more than 9 positive axillary lymph nodes
• No palpable or radiographically suspicious contralateral axillary, supraclavicular, infraclavicular, or internal mammary nodes unless there is histologic confirmation that these nodes are negative for tumor
• No previously treated contralateral breast cancer or synchronous ipsilateral breast cancer
• No lobular carcinoma in situ alone (i.e., no invasive component) or non-epithelial breast malignancies (e.g., sarcoma or lymphoma)
• No Paget disease of the nipple
• No skin involvement, regardless of tumor size
• No distant metastases
• Hormone receptor status not specified

PATIENT CHARACTERISTICS:

• Pre- or post-menopausal
• ECOG performance status 0-1
• No co-existing medical condition that would limit life expectancy to < 2 years
• Not pregnant or nursing
• Negative pregnancy test
• Fertile patients must use effective contraception
• No other malignancy within the past 5 years except for nonmelanoma skin cancer (the disease-free interval from any prior malignancy must be continuous)
• No collagen vascular disease, specifically systemic lupus erythematosus, scleroderma, or dermatomyositis
• No psychiatric or addictive disorder that would preclude obtaining informed consent

PRIOR CONCURRENT THERAPY:

• See Disease Characteristics
• No prior radiotherapy for the current breast cancer
• No tylectomies so extensive that the cosmetic result is low or poor prior to radiotherapy

• Chemotherapy allowed provided the following criteria are met:

  • Chemotherapy is not administered prior to, during, and for ≥ 21 days after completion of radiotherapy (for patients receiving brachytherapy boost)
  • Chemotherapy is not administered for ≥ 21 days before, during, and for ≥ 21 days after completion of radiotherapy (for patients receiving external beam radiotherapy boost or chest wall irradiation)

• Concurrent tamoxifen, anastrozole, or other hormonal therapy allowed

  • May be initiated before, during, or after radiotherapy
• No other concurrent chemotherapy, immunotherapy, or experimental medications