Chemotherapy administered for the currently diagnosed breast cancer prior to randomization An excisional biopsy of this breast cancer Any radiation therapy for the currently diagnosed breast cancer prior to randomization Any radiation therapy (RT) for the currently diagnosed breast cancer prior to study enrollment Expanded Cohort: must have breast cancer. Prior malignancy, other than breast cancer, active within the last 6 months Patients may have bilateral breast cancer so long as one breast meets criteria for inflammatory breast cancer, and neither breast cancer has received prior therapy Any prior systemic therapy for breast cancer within 5 years Prior or concurrent use of hormonal therapy, chemotherapy, radiation therapy, or novel therapy to treat the current breast cancer, including any history of prior irradiation to the ipsilateral breast; additionally, the patient must not have had hormonal therapy for breast cancer treatment or for breast cancer prevention within 2 years prior to study enrollment; Note: Synchronous breast, cancer (including bilateral breast cancer) at separate sites is permissible, provided the patient does not receive medical treatments for breast cancer or radiation therapy to the ipsilateral breast during the 21 day study intervention period Breast cancer patients Prior systemic therapy for treatment and prevention of breast cancer Any radiation therapy for the currently diagnosed breast cancer prior to randomization Recurrent breast cancer Prior history of breast cancer. Planning to remain on current breast cancer therapy for at least 12 weeks HER2 positive breast cancer Women with pathologically demonstrated breast cancer Male breast cancer patients. If the patient has a history of a prior non-breast cancer, all treatment for this cancer must have been completed prior to study registration and the patient must have no evidence of disease for this prior non-breast cancer Male breast cancer If the patient has a history of a prior non-breast cancer, all treatment for this cancer must have been completed prior to study registration, and the patient must have no evidence of disease for this prior non-breast cancer Prior systemic therapy for indexed breast cancer Received any prior cancer therapy for the breast, uterine, or cervical cancer that is being resected, including progesterone therapy for endometrial cancer patients\r\n* Patients may have had prior therapy for other contra-lateral breast cancer Patients must not have received prior treatment for the current breast cancer Must have received no more than 2 lines of chemotherapy for the treatment of breast cancer, and one for the treatment of advanced breast cancer Any other presurgical therapy for breast cancer No prior treatment with therapeutic intent for breast cancer Previous history of breast cancer (even in the other breast) Evidence of progressive breast cancer within the last 30 days A prior, unrelated, breast cancer is allowed All stages of breast cancer are eligible Evidence of progressive breast cancer within the last 30 days Hormone unresponsive breast cancer Prior systemic therapy for the indexed breast cancer Male breast cancer Prior therapy for breast cancer Subjects must not have received any other breast cancer-specific therapy for the current breast cancer diagnosis prior to registration A known BRCA-associate genetic mutation OR family history suggesting of a breast or ovarian cancer syndrome, as defined by one or more of the following:\r\n* Personal or known family history of a deleterious (or indeterminate) mutation in the BRCA1, BRCA2, PALB2, or one of the FANC genes\r\n* Personal history of breast cancer and one or more of the following:\r\n** Diagnosed =< 45 years old\r\n** Diagnosed at any age with >= 1 1st, 2nd, or 3rd degree relative with breast cancer =< 50 years old and/or >= 1st, 2nd, or 3rd relative with epithelial ovarian cancer at any age\r\n** Two primary breast cancer with the first diagnosed at =< 50 years old\r\n** Diagnosed =< 60 years old with triple negative breast cancer\r\n** Diagnosed at any age with >= 2 1st, 2nd, or 3rd degree relatives with breast cancer at any age\r\n** Diagnosed at any age with >= 2 1st, 2nd, or 3rd degree relatives with pancreatic cancer or aggressive prostate cancer (Gleason score >= 7) at any age \r\n** 1st, 2nd, or 3rd degree male relative with breast cancer\r\n** Ashkenazi Jewish descent\r\n* Personal history of epithelial ovarian cancer\r\n* Personal history of male breast cancer\r\n* Personal history of pancreatic cancer and >= 2 1st, 2nd, or 3rd degree relatives with breast, epithelial ovarian, pancreatic, or aggressive prostate cancer (Gleason score >= 7) at any age Prior radiation therapy for the current breast cancer Previous breast cancer and /or radiation in the operated breast. Breast cancer A prior, unrelated, breast cancer is allowed Patients may have bilateral breast cancer so long as one breast meets criteria for inflammatory breast cancer, and neither breast cancer has received prior therapy No prior chemotherapy for this primary breast cancer Prior radiation therapy for breast cancer Candidate for breast cancer surgery on the basis of recommendation of a breast cancer surgeon Patients with a prior history of contra-lateral breast cancer are eligible if they have no evidence of recurrence of their initial primary breast cancer within the last 5 years Breast cancer must be HER2-negative. HER2 positive breast cancer Has pathologically documented breast cancer that: Exceptions are breast cancer in the other breast. Part B: Breast Cancer The subject has AR+ breast cancer The subject has a history of a non-breast cancer malignancy with the following exceptions: Patient has HER2-negative breast cancer HER2-positive breast cancer 12 patients with breast cancer for whom 5 FU chemotherapy is the standard treatment Patients with biopsy-confirmed breast cancer An excisional biopsy of this breast cancer The cancer enhances on breast MRI imaging =< 90 days from the patient’s most recent breast surgery for this breast cancer HER2-positive breast cancer confirmed by a central laboratory HER2-positive breast cancer Patients who have received a previous HER2 breast cancer vaccine =< 90 days between the planned treatment start date and the patient’s most recent breast surgery for this breast cancer Prior treatment for the currently diagnosed breast cancer Prior therapy for the treatment of breast cancer is not allowed HER2-positive breast cancer Subjects with prior history of cancer in the ILT treated breast Subjects with recurrent breast cancer 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 Recurrent breast cancer Breast cancer: Patients with Her-2 negative breast cancer after anthracycline and taxane based chemotherapy. Any other neoadjuvant therapy for breast cancer (i.e., treatment with any other anti-cancer agent besides letrozole [10-21 days] before surgical resection of the primary breast tumor) Previous excisional biopsy of the breast cancer Any prior breast cancer Multicentric breast cancer Breast cancer eligible for primary surgery Breast cancer Breast cancer For subjects with breast cancer: No current evidence of breast cancer Recurrent breast cancer or other malignancy Has received more than 1 prior antiangiogenic agent for breast cancer Recurrent breast cancer or history of prior breast radiation therapy Breast cancer requiring bilateral breast/chest wall radiation therapy Male breast cancer patients Has a breast cancer recurrence, metastasis, or another interval cancer diagnosis following the breast cancer (excluding non-melanoma skin cancer) Pathologically confirmed breast cancer BREAST CANCER COHORT: No prior therapy for current breast cancer Evidence of recurrent breast cancer at the time of enrollment History of recurrent breast cancer (with a prior history of chemotherapy) Must not have had history of breast cancer, breast surgery, radiation to the chest wall Having received chemotherapy as part of their primary therapy for breast cancer. Any medical treatment for breast cancer will be allowed Subjects will not have breast surgery as a portion of their breast cancer care Those who are in treatment or not in treatment, but who were diagnosed with breast cancer within the past 5 years will be included Recurrence of breast cancer Phase I: Breast oncology team members at Massachusetts General Hospital (MGH) Cancer Center will be eligible if they are either physicians or nurse practitioners primarily involved in the care of breast cancer patients and with direct experience with metastatic breast cancer patients History of prior breast cancer surgery Breast cancer survivors Breast cancer at age 50 or below Have 2 or more blood relatives diagnosed with breast cancer A first degree relative diagnosed with breast cancer below age 50 Have any male relatives diagnosed with breast cancer Belongs to a breast cancer support group Must have completed local therapy for their breast cancer Survivors of breast cancer that have not received either breast surgery or radiation therapy Receiving treatment for another malignancy other than breast cancer Prior treatment of gynecologic or breast cancer with chemotherapy Have completed curative treatment for breast cancer Pathologically confirmed breast cancer Diagnosed with breast cancer Node-negative left breast cancer Male breast cancer survivors Pathologically confirmed HER2-positive breast cancer Have a history of breast cancer No prior chemotherapeutic treatment for any malignancy other than breast cancer Pathologic documentation of breast cancer Have been diagnosed with breast cancer Women with breast cancer who plan to undergo radiation therapy to the breast or chest wall Women with breast cancer involving the skin Women with a history of breast cancer (currently without malignant disease) or women who have no history of breast cancer but who wish to avoid estrogen due to a perceived increased risk of breast cancer Do not have a history of breast cancer Diagnosed with breast cancer at age 45 or younger Have one male relative with breast cancer Patients with known breast cancer Patients who have had a lumpectomy for breast cancer within 18 months prior to the study Have one or more first or second degree relatives with breast cancer, with at least one under the age of 60 BREAST CANCER SURVIVORS: Has histologically-confirmed, first-time breast cancer (stage I-IIIB); Must be at increased risk for breast cancer, defined as at least one of the following four criteria:\r\n* Having had a prior biopsy demonstrating atypical hyperplasia, lobular carcinoma in situ (LCIS), or ductal carcinoma in situ (DCIS)\r\n* A Gail Model Risk of >= 1.66% over 5 years\r\n* A strong family history of breast and/or ovarian cancer which is defined as at least one of the following:\r\n** One first-degree relative with breast cancer before the age of 50 years\r\n** One first degree relative with bilateral breast cancer\r\n** Two or more first-degree relatives with breast cancer\r\n** One first degree relative and two or more second or third degree relatives with breast cancer\r\n** One first-degree relative with breast cancer and one or more relatives with ovarian cancer\r\n** Two second or third degree relatives with either breast cancer and one or more with ovarian cancer\r\n** One second or third degree relative with breast cancer and two or more with ovarian cancer\r\n** Three or more second or third degree relatives with breast cancer\r\n* Known breast cancer (BRCA)1 or BRCA2 mutation carrier providing that the woman has \r\n** Met with a genetic counselor to review genetic testing results, and \r\n** Has been offered the opportunity to undergo prophylactic mastectomy and oophorectomy Prior history of breast cancer, breast/chest wall/axillary radiation therapy Moderate risk of developing breast cancer based on either by having at least one of following:\r\n* First or second degree relative with breast cancer age 60 or younger\r\n* Prior breast biopsy\r\n* Prior RPFNA atypia\r\n* Estimated mammographic density of 25% or higher\r\n* Gail 5-year risk of > 1.7% (as calculated by the National Cancer Institute [NCI] Breast Cancer Risk Assessment Tool) or a 5 year Gail Risk of 2X that for age group; and/or\r\n* International Breast Cancer Intervention Study (IBIS) Breast Cancer Risk Evaluation 10-year relative risk of > 2X that for the population for age group Women at high-risk of breast cancer, as defined by one of the following:\r\n* Cytologically confirmed atypical hyperplasia\r\n* Cytologically confirmed lobular breast carcinoma in situ (LCIS)\r\n* Being a carrier for at least one of the following mutations:\r\n** BRCA1 and/or BRCA2\r\n** TP53\r\n** PTEN\r\n** CDH1\r\n** PALB2\r\n** ATM\r\n** CHEK2\r\n* Predicted lifetime risk of breast cancer > 20% based on family history\r\n* Predicted 10-year risk of breast cancer of >= 2.31%\r\n* Predicted 5-year risk of breast cancer >= 1.67% Recurrent breast cancer Definition of a high risk population: \r\n* The study population will consist of women with a relative risk of developing breast cancer that is at least > 2 x that of the general population for their age group on the basis of any of the following:\r\n** Have a known genetic mutation associated with hereditary breast cancer (including breast cancer [BRCA]1, BRCA2, tumor protein [p]53, etc.)\r\n** One or more first degree relatives with breast cancer, with at least one under the age of 60\r\n** Two or more second degree relatives with breast cancer, with at least one under the age of 50\r\n** Prior biopsy diagnosing atypical lobular hyperplasia, atypical ductal hyperplasia, lobular carcinoma in situ, or ductal carcinoma in situ in the last 10 years\r\n** Have a Gail Risk Assessment (which is based on age, race, age of menarche, age of first live birth, number of first degree relatives with breast cancer, number of breast biopsies, and presence of high risk histology on any biopsies) that is considered high risk compared to the general population: \r\n*** 5 year Gail >= 1.7 or\r\n*** 10 year Gail >= 3.4%\r\n** Prior diagnosis of T1 or T2 breast cancer diagnosed within the last 10 years, without chemotherapy or antiestrogen therapy for > six months and >= 2 months since completion of radiation therapy, when applicable Subjects who have been diagnosed with a prior cancer at any site (other than breast cancer) may participate as long as they have been off medical therapy for at least 12 months prior to registration Patients must be at elevated risk for breast cancer based on strong family history or a history of breast biopsy documenting atypical hyperplasia anytime in the past; for this study strong family history is defined as having:\r\n* 1 first-degree (parent, offspring, sibling) relative =< 50 years old when diagnosed with breast cancer, or\r\n* >= 2 first-degree relatives of any age when diagnosed with breast cancer, or\r\n* >= 2 second-degree (aunts, uncles, grandparents, grandchildren, nieces, nephews, or half-siblings) maternal or paternal relatives diagnosed with breast cancer and at least 1 diagnosed at =< 50 years of age Women with history of surgical, medical, or radiation therapy for breast cancer No prior history of breast cancer PATIENT: Be diagnosed with breast cancer High risk: this includes patients with any of the following:\r\n* >= 20% lifetime risk of breast cancer\r\n* Breast cancer, early onset (BRCA) mutation or other hereditary germ line mutation\r\n* History of chest wall radiation\r\n* Lobular carcinoma in situ (LCIS)\r\n* History of breast cancer diagnosed at age 40 or earlier\r\n* History of breast cancer with 1st or 2nd degree relative with breast cancer and either patient or relative diagnosed at 50 years or younger\r\n* History of breast cancer with mammographically occult lesions\r\n* History of breast cancer for whom a medical oncologist feels breast MRI screening is important Patients who have received prior treatment for the current breast cancer Patients with cancer > 3 cm, clinically positive nodes, prior surgery for breast cancer in the index breast, thyroid dysfunction, hypersensitivity to iodine, and hepatic or renal insufficiency will be excluded from the study Serious systemic illness other than breast cancer BREAST CANCER PARTICIPANTS: Participant has biopsy proven breast cancer and may or may not undergo surgical excision of the cancerous lesion(s) Women who have had a prior history of breast cancer in the same breast Multicentric breast cancer The cancer enhances on breast MRI imaging Any history of prior radiation or chemotherapy for breast cancer Women at high-risk of breast cancer with an order for a clinical screening breast MRI Women diagnosed with breast cancer within the last 6 months For participants with breast cancer only: Within 6 weeks of a new line of breast cancer therapy and/or progression on scans and/or a change in current breast cancer therapy regimen Patient: Had a mastectomy for breast cancer no more than 5 years prior to enrollment Newly diagnosed female breast cancer patients scheduled to see one of four breast surgeons at the Huntsman Cancer Hospital Breast Surgery Clinic at the University of Utah Patients who have had breast cancer previously Latinas diagnosed with breast cancer Patient’s breast cancer has not recurred during the time period