No active symptomatic ischemic heart disease, myocardial infarction or congestive heart failure within the past year; if multi gated acquisition (MUGA) is obtained, the left ventricular ejection fraction (LVEF) should exceed 40% 348.0 Ejection fraction >= 47% by radionuclide angiogram (multi gated acquisition scan [MUGA]); Note: the echocardiogram (or MUGA) may be done within 28 days prior to enrollment 253.0 Cardiac ejection fraction >= 45% or within institutional normal limits; a nuclear medicine gated blood pool examination is preferred; a two-dimensional (2-D) echocardiogram (ECHO) scan is acceptable if a calculated ejection fraction is obtained and follow-up measurement of the cardiac ejection fraction will also be performed by echocardiography; measurement of cardiac ejection fraction should be within two weeks prior to receiving treatment* NOTE: when a multi gated acquisition scan (MUGA) or echocardiogram cannot be obtained due to weekend or holiday, then patients may be enrolled provided there is no history of significant cardiovascular disease and a measurement of cardiac ejection fraction will be performed within 5 days of study enrollment 747.0 Patients must have a cardiac ejection fraction >= institutional lower limit of normal (ILLN) by multi gated acquisition (MUGA) scan or 2-dimensional (D) echocardiogram (ECHO) within 42 days prior to registration 155.0 Cardiac function:* Normal ejection fraction (>= 55%) documented by either echocardiogram or radionuclide multi gated acquisition scan (MUGA) evaluation; OR * Normal fractional shortening (>= 27%) documented by echocardiogram 62.0 Left ventricular ejection fraction >= institutional lower limit of normal (LLN) by echocardiogram (ECHO) or multi gated acquisition scan (MUGA) 30.0 Patients must not have a cardiac ejection fraction < 45% or the presence of New York Heart Association stage III or IV heart failure within 14 days prior to registration; either echocardiogram (ECHO) or multiple-gated acquisition scan (MUGA) may be used to determine ejection fraction 38.0 Left ventricular ejection fraction >= institutional lower limit of normal (LLN) by echocardiogram (ECHO) or multi gated acquisition scan (MUGA) 130.0 Patients must have a left ventricular ejection fraction >= lower limit of normal by echocardiogram (ECHO) or multigated acquisition scan (MUGA) 250.0 Patients must not have presence of class III or IV heart failure, according to New York Heart Association classifications, or a known left ventricular ejection fraction of less than 50%; Note: left ventricular ejection fraction (LVEF) evaluation by echocardiogram or multi-gated acquisition scan (MUGA) is not required prior to registration 230.0 Left ventricular ejection fraction >= institutional lower limit of normal (LLN) by echocardiogram (ECHO) or multi gated acquisition scan (MUGA) 35.0 Left ventricular ejection fraction (LVEF) =< 55% as determined by multi gated acquisition (MUGA) scan or echocardiogram (ECHO) 23.0 Patients must have a left ventricular ejection fraction (LVEF) >= institutional lower limit of normal (ILLN) by echocardiogram (ECHO) or multi gated acquisition scan (MUGA) within 28 days prior to registration 280.0 Left ventricular ejection fraction (LVEF) > 40% as assessed by echocardiogram or multi gated acquisition scan (MUGA) 52.0 Patients must have a left ventricular ejection fraction (LVEF) >= 50% by (either multigated acquisition [MUGA] or 2-dimensional [2-D] echocardiogram) within 28 days of registration 60.0 Left ventricular ejection fraction (LVEF) assessment must be performed within 90 days prior to randomization; (LVEF assessment performed by 2-dimensional [D] echocardiogram is preferred; however, multi gated acquisition [MUGA] scan may be substituted based on institutional preferences;) the LVEF must be >= 50% regardless of the cardiac imaging facility's lower limit of normal 990.0 New York Heart Association class I or less; ordinary physical activity does not cause undue fatigue, palpitations, dyspnea, or angina pain; patients 60 years or older must have a left ventricular ejection fraction (LVEF) at rest >= 40% measured by echocardiogram or multi-gated acquisition (MUGA) 302.0 Left ventricular ejection fraction of > 50% on baseline echocardiography or multi-gated acquisition (MUGA) scan 33.0 Left ventricular ejection fraction < 50% on echocardiogram or multi-gated acquisition (MUGA) 82.0 Patients with left ventricular ejection fraction < 50% on echocardiogram or multigated acquisition scan will be excluded 37.0 Left ventricular ejection fraction =< 50% as demonstrated by echocardiogram or multigated acquisition scan (MUGA) 46.0 Left ventricular ejection fraction (LVEF) >= 50% by 2-dimensional (2D) echocardiogram (ECHO) or multigated acquisition (MUGA) scan; timeline: within 4 weeks prior to enrollment 18.0 CLINICAL/LABORATORY CRITERIA: Patients must have a left ventricular ejection fraction (LVEF) >= institutional lower limit of normal (ILLN) by echocardiography (ECHO) or multi-gated acquisition scan (MUGA) within 42 days prior to registration 53.0 Patients must have an echocardiogram (ECHO) or multigated acquisition (MUGA) scan within 42 days prior to registration with a cardiac ejection fraction >= 45% 150.0 Shortening fraction >= 27% by echocardiogram 253.0 Patients must have a cardiac ejection fraction of >= 40%, or within institutional normal limits; a nuclear medicine gated blood pool examination is preferred; a 2-D ECHO scan is acceptable if a calculated ejection fraction is obtained and follow-up measurement of the cardiac ejection fraction will also be performed by echocardiography; measurement of cardiac ejection fraction should be within two weeks prior to allogeneic transplantation 747.0 Shortening fraction of >= 27% by echocardiogram, or ejection fraction of >= 50% by radionuclide angiogram 693.0 Cardiac ejection fraction >= 50% as determined by screening echocardiogram 45.0 Shortening fraction of >= 27% by echocardiogram (ECHO) OR 74.0 Ejection fraction >= 50% by ECHO or gated radionuclide study 74.0 Normal baseline cardiac ejection fraction >= 50% 70.0 Shortening fraction of >= 27% by echocardiogram, or 140.0 Ejection fraction of >= 50% by radionuclide angiogram 140.0 Patient must have a normal cardiac ejection fraction by pretreatment multigated acquisition scan (MUGA) or echocardiogram within 4 weeks prior to registration (resting ejection fraction >= 40% or >= 5% increase with exercise), shortening fraction by echocardiogram >= 24%, or to within the normal range of values for the institution 509.0 Shortening fraction of >= 27% by echocardiogram, or 598.0 Ejection fraction of >= 50% by radionuclide angiogram 598.0 Patients must have ejection fraction >= 45% based on echocardiogram performed within 28 days prior to registration 44.0 Patients with a history of congestive heart failure (CHF) or are at risk because of underlying cardiovascular disease or exposure to cardiotoxic drugs must have adequate cardiac function as clinically indicated:* Corrected QT interval (QTC) =< 480 msec* Shortening fraction of >= 27% by echocardiogram or ejection fraction of >= 50% by gated radionuclide study 484.0 Shortening fraction of >= 27% by echocardiogram, or ejection fraction of >= 50% by radionuclide angiogram 600.0 Shortening fraction of >= 27% by echocardiogram OR ejection fraction of >= 50% by radionuclide angiogram 340.0 Shortening fraction of >= 27% or 330.0 Ejection fraction of >= 50% 330.0 Normal ejection fraction (echocardiogram [ECHO]) >= 53% (if a range is given then the upper value of the range will be used) or cardiac MRI 50.0 Shortening fraction of >= 27% by echocardiogram, or ejection fraction of >= 50% by gated radionuclide study 67.0 Shortening fraction of >= 27% by echocardiogram, or 44.0 Ejection fraction of >= 50% by radionuclide angiogram or echocardiogram 44.0 Shortening fraction of >= 27% by echocardiogram, or 56.0 Ejection fraction of >= 50% by radionuclide angiogram or echocardiogram 56.0 RECURRENT/ PROGRESSIVE DIPG (STRATUM 1): Cardiac function: * Left ventricular ejection fraction >= 50 by gated radionuclide study OR shortening fraction of >= 27% by echocardiogram* Patient has no ventricular arrhythmias except for benign premature ventricular contractions* Patient has a corrected QT (QTc) interval =< 450 ms 50.0 NON-PROGRESSED DIPG (STRATUM 2): Left ventricular ejection fraction >= 50 by gated radionuclide study OR shortening fraction of >= 27% by echocardiogram 50.0 Ejection fraction of < 50% (by radionuclide angiogram or echocardiogram) or shortening fraction of < 25% (by echocardiogram)* Note: for instances where both are reported, and one is below the threshold, the site will have the option to re-measure it centrally at the core lab 250.0 Shortening fraction of >= 27% by echocardiogram, or ejection fraction of >= 50% by gated radionuclide study 65.0 Shortening fraction of >= 27% by echocardiogram 700.0 Ejection fraction of >= 50% by radionuclide angiogram or echocardiogram 700.0 Shortening fraction of >= 27% by echocardiogram, or ejection fraction of >= 50% by gated radionuclide study within 7 days prior to enrollment 49.0 Participants with known congestive heart failure (CHF); if known, patients with left ventricular ejection fraction (LVEF) =< 40% are excluded 90.0 Left ventricular ejection fraction (LVEF) >= 55% 180.0 Pediatric patients: normal left ventricular function with ejection fraction > 55% or shortening fraction >= 27% 73.0 Left ventricular ejection fraction (LVEF) >= institutional lower limit of normal 70.0 Left ventricular ejection fraction >= 45% 63.0 Systolic cardiac function will be assessed at screening if clinically indicated by history and physical; only patients with left ventricular ejection fraction (LVEF) >= 50% will be eligible for enrollment 28.0 Left ventricular ejection fraction (LVEF) >= 50% (measured within 28 days of study entry) 96.0 Patients must have left ventricular ejection fraction (LVEF) > 45% or within institutional normal limits 57.0 Left ventricular ejection fraction (LVEF) < 50%, regardless of whether there are symptoms of heart failure 50.0 Left ventricular ejection fraction (LVEF) >= 50% 84.0 If cardiac function assessment is clinically indicated or performed: participants will be ineligible if left ventricular ejection fraction (LVEF) is less than normal per institutional guidelines, or < 55%, if the threshold for normal is not otherwise specified by institutional guidelines 70.0 Patient must have a left ventricular ejection fraction >= institutional lower limit of normal (LLN) by echocardiogram (ECHO) or multigated acquisition (MUGA) within 28 days prior to registration 97.0 Left ventricular ejection fraction >= institutional lower limit of normal (LLN) by echocardiogram (ECHO) 40.0 Left ventricular ejection fraction >= institutional lower limit of normal (LLN) by echocardiogram (ECHO), within 2 weeks of the first dose of study treatment 18.0 Left ventricular ejection fraction >= institutional lower limit of normal (LLN) by echocardiogram (ECHO) 68.0 Left ventricular ejection fraction (LVEF) >= institutional lower limit of normal (LLN) by echocardiogram (ECHO) or multigated acquisition scan (MUGA) 68.0 Left ventricular >= institutional lower limit of normal (LLN) by echocardiogram (ECHO) ejection fraction 32.0 Left ventricular ejection fraction >= institutional lower limit of normal (LLN) by echocardiogram (ECHO) 18.0 Left ventricular ejection fraction (LVEF) >= institutional lower limit of normal (LLN) by echocardiogram (ECHO) or multigated acquisition scan (MUGA) within 30 days of day 1 of study 27.0