New diagnosis of DCIS without invasive cancer; date of diagnosis defined as the date of the first pathology report that diagnosed the patient with DCIS No previous history of breast cancer (DCIS or invasive cancer) in either breast prior to current DCIS diagnosis No history of invasive breast cancer in 5 years prior to study registration other than the current diagnosis (prior ductal breast carcinoma in situ [DCIS] at any time is acceptable) DCIS or Stage I-III primary invasive carcinoma of the breast Diagnosis of invasive ductal breast carcinoma by core needle biopsy, meeting the following criteria: High grade and/or invasive and/or carcinoma in situ disease INCLUSION - ENROLLMENT: Diagnosis of invasive ductal carcinoma Prior diagnosis of invasive or ductal carcinoma in situ breast cancer in the ipsilateral breast Any prior diagnosis of invasive or ductal carcinoma in situ breast cancer in either breast Multicentric gross breast carcinoma (either DCIS or invasive cancer) or microscopic breast carcinoma occupying a volume with maximum dimensions of more than 3 centimeters Women with a biopsy proven diagnosis of ductal carcinoma in situ or invasive carcinoma of the breast; biopsy tissue (either slides or block) from outside institutions will be reviewed to confirm diagnosis Women with a biopsy proven diagnosis of ductal carcinoma in situ or invasive carcinoma of the breast\r\n* Biopsy tissue (either slides or block) from outside institutions will be reviewed to confirm diagnosis Previously untreated breast cancer determined by a core needle biopsy showing invasive ductal carcinoma or invasive lobular carcinoma Proven multicentric carcinoma (invasive or ductal carcinoma in situ [DCIS]) in more than one quadrant or separated by > 4 centimeters Multifocal or multicentric invasive breast carcinoma Subjects with histologically-confirmed operable invasive breast cancer or ductal carcinoma in situ (DCIS), who undergo core needle biopsy with a plan of surgical excision (goal: approximately 2 weeks of study medications after enrollment) Proven multicentric carcinoma (invasive cancer or DCIS) in more than one quadrant or two or more breast cancers not resectable through a single lumpectomy incision Proven multicentric carcinoma (invasive cancer or DCIS) in more than one quadrant or separated by 4 or more centimeters Current diagnosis of invasive or inflammatory breast carcinoma Previously untreated breast cancer determined by a core needle biopsy showing invasive ductal carcinoma or invasive lobular carcinoma Multicentric invasive or in situ carcinoma Study participants must be cT1c - cT4a-d any N, M0; any T is allowed if node positive (biopsy proven and HER2 positive) including no primary invasive cancer or only ductal breast carcinoma in situ (DCIS); metastatic workup is not required Multicentric carcinoma (DCIS or invasive) No prior surgical excision in the index breast for current DCIS diagnosis of DCIS Patients with a prior diagnosis of contralateral ductal carcinoma in situ (DCIS) are eligible if they underwent a mastectomy or lumpectomy with whole breast radiation; prior partial breast irradiation, including brachytherapy, is not allowed; patients with a prior diagnosis of ipsilateral DCIS or invasive breast cancer who received radiation to that breast are not eligible Pathologically proven diagnosis of ductal carcinoma in situ (DCIS) or invasive breast cancer Histologic diagnosis of palpable invasive breast cancer or ductal carcinoma in situ Proven multicentric carcinoma (DCIS or invasive) in more than one quadrant or separated by 4 or more centimeters or diffuse (> 1 quadrant) suspicious calcifications Patients may have had prior non-invasive (ductal carcinoma in situ [DCIS]) cancer if there has been no recurrence; prior ipsilateral invasive cancer also allowed if more than 5 years previous Diagnosis of pathologically-confirmed invasive breast cancer or ductal carcinoma in situ Core biopsy should definitively demonstrate invasive carcinoma Patients with multiple foci of invasive cancer in the same breast are eligible if any single lesion meets the above size criteria and all sampled lesions are histologically similar (whether radiographically detected lesions separate from the target lesion are sampled for histologic evaluation is left to the discretion of the treating physicians); the presence of ductal carcinoma in situ (DCIS) or lobular carcinoma in situ (LCIS) in either breast will not render a patient ineligible; patients with a small focus of invasive cancer detected the contralateral breast (clinical T1N0) are eligible, however only the histologic response in the breast containing the target lesions will be considered in determining the patient’s pathologic response Diagnosis of early stage, invasive ductal carcinoma (for which a lumpectomy or mastectomy is planned prior to systemic therapy) Patient has diagnosis of biopsy-proven primary breast cancer or a diagnosis of pure ductal carcinoma in situ (DCIS) who will be undergoing intraoperative lymphatic mapping as part of their standard surgical plan New diagnosis of invasive carcinoma Personal history and/or concomitant diagnosis of invasive breast cancer or DCIS Core needle biopsy positive for invasive breast cancer or ductal breast carcinoma in situ (DCIS) Previous surgery for DCIS or invasive cancer Women undergoing preoperative evaluation at the University of Kansas Cancer Center (KUCC) for a new diagnosis of breast cancer (ductal carcinoma in situ [DCIS] or any invasive breast cancer) Patient must have a tissue diagnosis of invasive breast carcinoma Patient's most recent surgery was wide local excision with or without re-excision and for which there was obtained clear (>= 2 mm) margins at breast conserving surgery, and the pathology reveals pure DCIS; patients with invasive cancer or DCIS with microinvasion will not be registered on step 3, but will be followed for clinical outcomes\r\n* NOTE: if resection is documented to have reached pectoral fascia and deep margin is free but less than 2 mm, the patient is eligible\r\n* NOTE: if no residual DCIS is found on wide local excision as it was fully removed in core biopsy, the patient is eligible\r\n* NOTE: patients with lobular carcinoma in situ (LCIS) as well as DCIS are eligible Histologic diagnosis of palpable invasive breast cancer or ductal carcinoma in situ Histologic diagnosis of invasive breast cancer or ductal carcinoma in situ Histologically or cytologically confirmed primary invasive breast cancer, ductal carcinoma in situ (DCIS) or a combination of invasive breast cancer and DCIS. Subjects who had diagnostic surgical biopsies are excluded from participation.