RO4929097 and Whole-Brain Radiation Therapy or Stereotactic Radiosurgery in Treating Patients With Brain Metastases From Breast Cancer

Inclusion Criteria: * Patients who have histologically or cytologically confirmed breast cancer or other cancers (such as lung cancer, melanoma, etc) with newly diagnosed metastatic disease to the brain will be eligible for the Phase 1 study only, however, those patients who have available systemic therapeutic options with a demonstrated survival benefit will not be eligible; for Phase 2, patients must have histologically or cytologically confirmed estrogen receptor negative breast cancer with newly diagnosed metastatic disease to the brain * Patients must have measurable disease in the brain, defined as at least one lesion that can be accurately measured in at least two dimensions (longest diameter and its longest perpendicular diameter to be recorded) * There is no limit on type or number of prior therapies, except that prior therapy with notch inhibitors is not allowed, and patients should not have received prior cranial radiation; therapy naïve patients are eligible; at least 14 days (2 weeks) must have elapsed from any prior experimental therapy, chemotherapy or radiotherapy; toxicities from prior chemotherapy or radiotherapy should have resolved to \< grade 2; patients with newly diagnosed brain metastases who have received therapeutic regimens with well-characterized, delayed toxicity (e.g. hematologic toxicity observed following carmustine \[BCNU\] or mitomycin C) will not receive experimental therapy until the patient has adequately recovered from all drug related toxicities * Karnofsky performance status (KPS) \>= 70%; Recursive Partitioning Analysis (RPA) class I or II; a small feasibility cohort of 10 RPA class III (KPS \< 70%) patients may be enrolled, however these patients, if enrolled will not be included in the efficacy analysis * Hemoglobin \>= 9g/dL * Absolute neutrophil count \>= 1,000/mcL * Platelets \>= 100,000/mcL * Total bilirubin within normal institutional limits * Aspartate aminotransferase (AST) (serum glutamic oxaloacetic transaminase \[SGOT\]) =\< 2.5 x institutional upper limit of normal * Alanine aminotransferase (ALT) (serum glutamate pyruvate transaminase \[SGPT\]) =\< 2.5 x institutional upper limits of normal * Creatinine within normal institutional limits OR creatinine clearance \>= 60 mL/min/1.73 m\^2 for patients with creatinine levels above institutional normal * Tumor HER2/neu status may be positive or negative * Women of childbearing potential and men must use two forms of contraception (i.e., barrier contraception and one other method of contraception) for the duration of study participation, and for at least 12 months post-treatment; should a woman become pregnant or suspect she is pregnant while she or her partner are participating in this study and for 12 months after study participation, the patient should inform the treating physician immediately; prior to dispensing RO4929097, the investigator must confirm and document the patient's agreement to the use of two contraceptive methods, dates of negative pregnancy test, and confirm the patient's understanding of the teratogenic potential of RO4929097 * Ability to understand and the willingness to sign a written informed consent document * A tumor site (outside the central nervous system) for needle biopsy for research purposes is preferable * Ability to swallow pills Exclusion Criteria: * At least 14 days (2 weeks) must have elapsed from any prior experimental therapy, chemotherapy or radiotherapy; toxicities from prior chemotherapy or radiotherapy should have resolved to \< grade 2 * Patients may not be receiving any other investigational agents * Patients with leptomeningeal metastases should be excluded from this clinical trial * History of allergic reactions attributed to compounds of similar chemical or biologic composition to RO4929097 * Patients taking medications with narrow therapeutic indices that are metabolized by cytochrome P450 (CYP450), including warfarin sodium (Coumadin®) are ineligible * Patients taking medications that are generally accepted by the QTdrugs.org Advisory Board to carry a risk of torsades de pointes, including antiemetics, are ineligible * Preclinical studies indicate that RO4929097 is a substrate of CYP450 family 3, subfamily A, polypeptide 4 (CYP3A4) and inducer of CYP3A4 enzyme activity; caution should be exercised when dosing RO4929097 concurrently with CYP3A4 substrates, inducers, and/or inhibitors; furthermore, patients who are taking concurrent medications that are strong inducers/inhibitors or substrates of CYP3A4 should be switched to alternative medications to minimize any potential risk; if such patients cannot be switched to alternative medications, they will be ineligible to participate in this study * Patients with malabsorption syndrome or other condition that would interfere with intestinal absorption; patients must be able to swallow tablets * Patients who are known to be serologically positive for hepatitis A, B or C, or have a history of liver disease, other forms of hepatitis or cirrhosis are ineligible * Patients with uncontrolled hypocalcemia, hypomagnesemia, hyponatremia, hypophosphatemia or hypokalemia defined as less than the lower limit of normal for the institution, despite adequate electrolyte supplementation are excluded from this study * Uncontrolled electrolyte abnormalities including hypocalcemia, hypomagnesemia, and hypokalemia; uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure (New York Heart Association \[NYHA\] class III or IV), unstable angina pectoris, a history of torsades de pointes or other significant cardiac arrhythmias, stable atrial fibrillation, or psychiatric illness/social situations that would limit compliance with study requirements * Pregnant women are excluded from this study; breastfeeding should be discontinued if the mother is treated with RO4929097 * Cardiovascular: baseline QTcF \> 450 msec (male) or QTcF \> 470 msec (female) * Patients who have not recovered to \< Common Terminology Criteria for Adverse Events (CTCAE) grade 2 toxicities related to prior therapy are not eligible to participate in this study * A requirement for antiarrhythmics or other medications known to prolong QTc