Able to swallow whole capsules Patients must be able to swallow whole capsules Patients must be able to swallow pills Patients who cannot swallow capsules Patients who are unable to swallow pills/capsules are ineligible Patients must be able to swallow the drug Patients must be able to swallow capsules Patients must be able to swallow whole capsules Patients must be able to swallow whole tablets and capsules Patients must be able to swallow capsules Patients must be able to swallow capsules Patients must be able to swallow capsules whole Patients must be able to swallow whole capsules Patients must be able to swallow whole capsules Patients with malabsorption syndrome or other condition that would interfere with intestinal absorption; patients must be able to swallow capsules Patients must be able to swallow pills Ability to swallow pills/capsules Patients must be able to swallow whole capsules RECURRENT/ PROGRESSIVE DIPG (STRATUM 1): Patient must be able to swallow capsules whole NON-PROGRESSED DIPG (STRATUM 2): Patient must be able to swallow capsules whole Patients must be able to swallow whole capsule Able to swallow intact capsules Patients must be able to swallow intact capsules Patients must be able to swallow whole capsules Patients must be able to take oral medications; patients must be able to swallow capsules whole without crushing or altering them in any way Patients must be able to swallow capsules Patients must be able to swallow intact capsules Patients must be able to swallow intact capsules whole GENERAL INCLUSION CRITERIA FOR SUBPROTOCOLS: Patients must be able to swallow intact capsules/tablets, unless otherwise specified in the subprotocol to which they are assigned